* [PATCH v2 01/21] x86/xen: separate PV and HVM hypervisors
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-08 15:06 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 02/21] x86/xen: globalize have_vcpu_info_placement Vitaly Kuznetsov
` (20 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
As a preparation to splitting the code we need to untangle it:
x86_hyper_xen -> x86_hyper_xen_hvm and x86_hyper_xen_pv
xen_platform() -> xen_platform_hvm() and xen_platform_pv()
xen_cpu_up_prepare() -> xen_cpu_up_prepare_pv() and xen_cpu_up_prepare_hvm()
xen_cpu_dead() -> xen_cpu_dead_pv() and xen_cpu_dead_pv_hvm()
Add two parameters to xen_cpuhp_setup() to pass proper cpu_up_prepare and
cpu_dead hooks. xen_set_cpu_features() is now PV-only so the redundant
xen_pv_domain() check can be dropped.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/include/asm/hypervisor.h | 3 +-
arch/x86/kernel/cpu/hypervisor.c | 3 +-
arch/x86/xen/enlighten.c | 113 +++++++++++++++++++++++++-------------
3 files changed, 78 insertions(+), 41 deletions(-)
diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index 67942b6..6f7545c6 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -53,7 +53,8 @@ extern const struct hypervisor_x86 *x86_hyper;
/* Recognized hypervisors */
extern const struct hypervisor_x86 x86_hyper_vmware;
extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
-extern const struct hypervisor_x86 x86_hyper_xen;
+extern const struct hypervisor_x86 x86_hyper_xen_pv;
+extern const struct hypervisor_x86 x86_hyper_xen_hvm;
extern const struct hypervisor_x86 x86_hyper_kvm;
extern void init_hypervisor(struct cpuinfo_x86 *c);
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index 35691a6..a77f18d 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -29,7 +29,8 @@
static const __initconst struct hypervisor_x86 * const hypervisors[] =
{
#ifdef CONFIG_XEN
- &x86_hyper_xen,
+ &x86_hyper_xen_pv,
+ &x86_hyper_xen_hvm,
#endif
&x86_hyper_vmware,
&x86_hyper_ms_hyperv,
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index ec1d5c4..4c1a582 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -139,9 +139,11 @@ void *xen_initial_gdt;
RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
-static int xen_cpu_up_prepare(unsigned int cpu);
+static int xen_cpu_up_prepare_pv(unsigned int cpu);
+static int xen_cpu_up_prepare_hvm(unsigned int cpu);
static int xen_cpu_up_online(unsigned int cpu);
-static int xen_cpu_dead(unsigned int cpu);
+static int xen_cpu_dead_pv(unsigned int cpu);
+static int xen_cpu_dead_hvm(unsigned int cpu);
/*
* Point at some empty memory to start with. We map the real shared_info
@@ -1447,13 +1449,14 @@ static void __init xen_dom0_set_legacy_features(void)
x86_platform.legacy.rtc = 1;
}
-static int xen_cpuhp_setup(void)
+static int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
+ int (*cpu_dead_cb)(unsigned int))
{
int rc;
rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
"x86/xen/hvm_guest:prepare",
- xen_cpu_up_prepare, xen_cpu_dead);
+ cpu_up_prepare_cb, cpu_dead_cb);
if (rc >= 0) {
rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"x86/xen/hvm_guest:online",
@@ -1559,7 +1562,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
possible map and a non-dummy shared_info. */
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
- WARN_ON(xen_cpuhp_setup());
+ WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_pv, xen_cpu_dead_pv));
local_irq_disable();
early_boot_irqs_disabled = true;
@@ -1840,28 +1843,41 @@ static void __init init_hvm_pv_info(void)
}
#endif
-static int xen_cpu_up_prepare(unsigned int cpu)
+static int xen_cpu_up_prepare_pv(unsigned int cpu)
{
int rc;
- if (xen_hvm_domain()) {
- /*
- * This can happen if CPU was offlined earlier and
- * offlining timed out in common_cpu_die().
- */
- if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
- xen_smp_intr_free(cpu);
- xen_uninit_lock_cpu(cpu);
- }
+ xen_setup_timer(cpu);
- if (cpu_acpi_id(cpu) != U32_MAX)
- per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
- else
- per_cpu(xen_vcpu_id, cpu) = cpu;
- xen_vcpu_setup(cpu);
+ rc = xen_smp_intr_init(cpu);
+ if (rc) {
+ WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
+ cpu, rc);
+ return rc;
+ }
+ return 0;
+}
+
+static int xen_cpu_up_prepare_hvm(unsigned int cpu)
+{
+ int rc;
+
+ /*
+ * This can happen if CPU was offlined earlier and
+ * offlining timed out in common_cpu_die().
+ */
+ if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
+ xen_smp_intr_free(cpu);
+ xen_uninit_lock_cpu(cpu);
}
- if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
+ if (cpu_acpi_id(cpu) != U32_MAX)
+ per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
+ else
+ per_cpu(xen_vcpu_id, cpu) = cpu;
+ xen_vcpu_setup(cpu);
+
+ if (xen_feature(XENFEAT_hvm_safe_pvclock))
xen_setup_timer(cpu);
rc = xen_smp_intr_init(cpu);
@@ -1873,16 +1889,25 @@ static int xen_cpu_up_prepare(unsigned int cpu)
return 0;
}
-static int xen_cpu_dead(unsigned int cpu)
+static int xen_cpu_dead_pv(unsigned int cpu)
{
xen_smp_intr_free(cpu);
- if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
- xen_teardown_timer(cpu);
+ xen_teardown_timer(cpu);
return 0;
}
+static int xen_cpu_dead_hvm(unsigned int cpu)
+{
+ xen_smp_intr_free(cpu);
+
+ if (xen_feature(XENFEAT_hvm_safe_pvclock))
+ xen_teardown_timer(cpu);
+
+ return 0;
+}
+
static int xen_cpu_up_online(unsigned int cpu)
{
xen_init_lock_cpu(cpu);
@@ -1919,7 +1944,7 @@ static void __init xen_hvm_guest_init(void)
BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
xen_hvm_smp_init();
- WARN_ON(xen_cpuhp_setup());
+ WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm));
xen_unplug_emulated_devices();
x86_init.irqs.intr_init = xen_init_IRQ;
xen_hvm_init_time_ops();
@@ -1942,9 +1967,17 @@ static __init int xen_parse_nopv(char *arg)
}
early_param("xen_nopv", xen_parse_nopv);
-static uint32_t __init xen_platform(void)
+static uint32_t __init xen_platform_pv(void)
{
- if (xen_nopv)
+ if (xen_pv_domain())
+ return xen_cpuid_base();
+
+ return 0;
+}
+
+static uint32_t __init xen_platform_hvm(void)
+{
+ if (xen_pv_domain() || xen_nopv)
return 0;
return xen_cpuid_base();
@@ -1966,10 +1999,8 @@ EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
static void xen_set_cpu_features(struct cpuinfo_x86 *c)
{
- if (xen_pv_domain()) {
- clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
- set_cpu_cap(c, X86_FEATURE_XENPV);
- }
+ clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
+ set_cpu_cap(c, X86_FEATURE_XENPV);
}
static void xen_pin_vcpu(int cpu)
@@ -2011,17 +2042,21 @@ static void xen_pin_vcpu(int cpu)
}
}
-const struct hypervisor_x86 x86_hyper_xen = {
- .name = "Xen",
- .detect = xen_platform,
-#ifdef CONFIG_XEN_PVHVM
- .init_platform = xen_hvm_guest_init,
-#endif
- .x2apic_available = xen_x2apic_para_available,
+const struct hypervisor_x86 x86_hyper_xen_pv = {
+ .name = "Xen PV",
+ .detect = xen_platform_pv,
.set_cpu_features = xen_set_cpu_features,
.pin_vcpu = xen_pin_vcpu,
};
-EXPORT_SYMBOL(x86_hyper_xen);
+EXPORT_SYMBOL(x86_hyper_xen_pv);
+
+const struct hypervisor_x86 x86_hyper_xen_hvm = {
+ .name = "Xen HVM",
+ .detect = xen_platform_hvm,
+ .init_platform = xen_hvm_guest_init,
+ .x2apic_available = xen_x2apic_para_available,
+};
+EXPORT_SYMBOL(x86_hyper_xen_hvm);
#ifdef CONFIG_HOTPLUG_CPU
void xen_arch_register_cpu(int num)
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* Re: [PATCH v2 01/21] x86/xen: separate PV and HVM hypervisors
2017-03-02 17:53 ` [PATCH v2 01/21] x86/xen: separate PV and HVM hypervisors Vitaly Kuznetsov
@ 2017-03-08 15:06 ` Juergen Gross
0 siblings, 0 replies; 44+ messages in thread
From: Juergen Gross @ 2017-03-08 15:06 UTC (permalink / raw)
To: Vitaly Kuznetsov, xen-devel
Cc: x86, linux-kernel, Boris Ostrovsky, Andrew Jones
On 02/03/17 18:53, Vitaly Kuznetsov wrote:
> As a preparation to splitting the code we need to untangle it:
>
> x86_hyper_xen -> x86_hyper_xen_hvm and x86_hyper_xen_pv
> xen_platform() -> xen_platform_hvm() and xen_platform_pv()
> xen_cpu_up_prepare() -> xen_cpu_up_prepare_pv() and xen_cpu_up_prepare_hvm()
> xen_cpu_dead() -> xen_cpu_dead_pv() and xen_cpu_dead_pv_hvm()
>
> Add two parameters to xen_cpuhp_setup() to pass proper cpu_up_prepare and
> cpu_dead hooks. xen_set_cpu_features() is now PV-only so the redundant
> xen_pv_domain() check can be dropped.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> arch/x86/include/asm/hypervisor.h | 3 +-
> arch/x86/kernel/cpu/hypervisor.c | 3 +-
> arch/x86/xen/enlighten.c | 113 +++++++++++++++++++++++++-------------
> 3 files changed, 78 insertions(+), 41 deletions(-)
>
> diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
> index 67942b6..6f7545c6 100644
> --- a/arch/x86/include/asm/hypervisor.h
> +++ b/arch/x86/include/asm/hypervisor.h
> @@ -53,7 +53,8 @@ extern const struct hypervisor_x86 *x86_hyper;
> /* Recognized hypervisors */
> extern const struct hypervisor_x86 x86_hyper_vmware;
> extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
> -extern const struct hypervisor_x86 x86_hyper_xen;
> +extern const struct hypervisor_x86 x86_hyper_xen_pv;
> +extern const struct hypervisor_x86 x86_hyper_xen_hvm;
> extern const struct hypervisor_x86 x86_hyper_kvm;
>
> extern void init_hypervisor(struct cpuinfo_x86 *c);
> diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
> index 35691a6..a77f18d 100644
> --- a/arch/x86/kernel/cpu/hypervisor.c
> +++ b/arch/x86/kernel/cpu/hypervisor.c
> @@ -29,7 +29,8 @@
> static const __initconst struct hypervisor_x86 * const hypervisors[] =
> {
> #ifdef CONFIG_XEN
> - &x86_hyper_xen,
> + &x86_hyper_xen_pv,
> + &x86_hyper_xen_hvm,
> #endif
> &x86_hyper_vmware,
> &x86_hyper_ms_hyperv,
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index ec1d5c4..4c1a582 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -139,9 +139,11 @@ void *xen_initial_gdt;
>
> RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
>
> -static int xen_cpu_up_prepare(unsigned int cpu);
> +static int xen_cpu_up_prepare_pv(unsigned int cpu);
> +static int xen_cpu_up_prepare_hvm(unsigned int cpu);
> static int xen_cpu_up_online(unsigned int cpu);
> -static int xen_cpu_dead(unsigned int cpu);
> +static int xen_cpu_dead_pv(unsigned int cpu);
> +static int xen_cpu_dead_hvm(unsigned int cpu);
>
> /*
> * Point at some empty memory to start with. We map the real shared_info
> @@ -1447,13 +1449,14 @@ static void __init xen_dom0_set_legacy_features(void)
> x86_platform.legacy.rtc = 1;
> }
>
> -static int xen_cpuhp_setup(void)
> +static int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
> + int (*cpu_dead_cb)(unsigned int))
> {
> int rc;
>
> rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
> "x86/xen/hvm_guest:prepare",
> - xen_cpu_up_prepare, xen_cpu_dead);
> + cpu_up_prepare_cb, cpu_dead_cb);
> if (rc >= 0) {
> rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
> "x86/xen/hvm_guest:online",
> @@ -1559,7 +1562,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
> possible map and a non-dummy shared_info. */
> per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
>
> - WARN_ON(xen_cpuhp_setup());
> + WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_pv, xen_cpu_dead_pv));
>
> local_irq_disable();
> early_boot_irqs_disabled = true;
> @@ -1840,28 +1843,41 @@ static void __init init_hvm_pv_info(void)
> }
> #endif
>
> -static int xen_cpu_up_prepare(unsigned int cpu)
> +static int xen_cpu_up_prepare_pv(unsigned int cpu)
> {
> int rc;
>
> - if (xen_hvm_domain()) {
> - /*
> - * This can happen if CPU was offlined earlier and
> - * offlining timed out in common_cpu_die().
> - */
> - if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
> - xen_smp_intr_free(cpu);
> - xen_uninit_lock_cpu(cpu);
> - }
> + xen_setup_timer(cpu);
>
> - if (cpu_acpi_id(cpu) != U32_MAX)
> - per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
> - else
> - per_cpu(xen_vcpu_id, cpu) = cpu;
> - xen_vcpu_setup(cpu);
> + rc = xen_smp_intr_init(cpu);
> + if (rc) {
> + WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
> + cpu, rc);
> + return rc;
> + }
> + return 0;
> +}
> +
> +static int xen_cpu_up_prepare_hvm(unsigned int cpu)
> +{
> + int rc;
> +
> + /*
> + * This can happen if CPU was offlined earlier and
> + * offlining timed out in common_cpu_die().
> + */
> + if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
> + xen_smp_intr_free(cpu);
> + xen_uninit_lock_cpu(cpu);
> }
>
> - if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
> + if (cpu_acpi_id(cpu) != U32_MAX)
> + per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
> + else
> + per_cpu(xen_vcpu_id, cpu) = cpu;
> + xen_vcpu_setup(cpu);
> +
> + if (xen_feature(XENFEAT_hvm_safe_pvclock))
> xen_setup_timer(cpu);
>
> rc = xen_smp_intr_init(cpu);
> @@ -1873,16 +1889,25 @@ static int xen_cpu_up_prepare(unsigned int cpu)
> return 0;
> }
>
> -static int xen_cpu_dead(unsigned int cpu)
> +static int xen_cpu_dead_pv(unsigned int cpu)
> {
> xen_smp_intr_free(cpu);
>
> - if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
> - xen_teardown_timer(cpu);
> + xen_teardown_timer(cpu);
>
> return 0;
> }
>
> +static int xen_cpu_dead_hvm(unsigned int cpu)
> +{
> + xen_smp_intr_free(cpu);
> +
> + if (xen_feature(XENFEAT_hvm_safe_pvclock))
> + xen_teardown_timer(cpu);
> +
> + return 0;
> +}
> +
> static int xen_cpu_up_online(unsigned int cpu)
> {
> xen_init_lock_cpu(cpu);
> @@ -1919,7 +1944,7 @@ static void __init xen_hvm_guest_init(void)
> BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
>
> xen_hvm_smp_init();
> - WARN_ON(xen_cpuhp_setup());
> + WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm));
> xen_unplug_emulated_devices();
> x86_init.irqs.intr_init = xen_init_IRQ;
> xen_hvm_init_time_ops();
> @@ -1942,9 +1967,17 @@ static __init int xen_parse_nopv(char *arg)
> }
> early_param("xen_nopv", xen_parse_nopv);
>
> -static uint32_t __init xen_platform(void)
> +static uint32_t __init xen_platform_pv(void)
> {
> - if (xen_nopv)
> + if (xen_pv_domain())
> + return xen_cpuid_base();
> +
> + return 0;
> +}
> +
> +static uint32_t __init xen_platform_hvm(void)
> +{
> + if (xen_pv_domain() || xen_nopv)
> return 0;
>
> return xen_cpuid_base();
> @@ -1966,10 +1999,8 @@ EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
>
> static void xen_set_cpu_features(struct cpuinfo_x86 *c)
> {
> - if (xen_pv_domain()) {
> - clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
> - set_cpu_cap(c, X86_FEATURE_XENPV);
> - }
> + clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
> + set_cpu_cap(c, X86_FEATURE_XENPV);
> }
>
> static void xen_pin_vcpu(int cpu)
> @@ -2011,17 +2042,21 @@ static void xen_pin_vcpu(int cpu)
> }
> }
>
> -const struct hypervisor_x86 x86_hyper_xen = {
> - .name = "Xen",
> - .detect = xen_platform,
> -#ifdef CONFIG_XEN_PVHVM
> - .init_platform = xen_hvm_guest_init,
> -#endif
> - .x2apic_available = xen_x2apic_para_available,
> +const struct hypervisor_x86 x86_hyper_xen_pv = {
> + .name = "Xen PV",
> + .detect = xen_platform_pv,
> .set_cpu_features = xen_set_cpu_features,
> .pin_vcpu = xen_pin_vcpu,
> };
> -EXPORT_SYMBOL(x86_hyper_xen);
> +EXPORT_SYMBOL(x86_hyper_xen_pv);
> +
> +const struct hypervisor_x86 x86_hyper_xen_hvm = {
> + .name = "Xen HVM",
> + .detect = xen_platform_hvm,
> + .init_platform = xen_hvm_guest_init,
> + .x2apic_available = xen_x2apic_para_available,
Please keep the .pin_vcpu member. It will be needed for a PVH dom0.
Juergen
^ permalink raw reply [flat|nested] 44+ messages in thread
* [PATCH v2 02/21] x86/xen: globalize have_vcpu_info_placement
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
2017-03-02 17:53 ` [PATCH v2 01/21] x86/xen: separate PV and HVM hypervisors Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-08 15:07 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 03/21] x86/xen: add CONFIG_XEN_PV to Kconfig Vitaly Kuznetsov
` (19 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
have_vcpu_info_placement applies to both PV and HVM and as we're going
to split the code we need to make it global.
Rename to xen_have_vcpu_info_placement.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/enlighten.c | 12 ++++++------
arch/x86/xen/xen-ops.h | 2 ++
2 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 4c1a582..de77be9 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -164,7 +164,7 @@ struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
*
* 0: not available, 1: available
*/
-static int have_vcpu_info_placement = 1;
+int xen_have_vcpu_info_placement = 1;
struct tls_descs {
struct desc_struct desc[3];
@@ -228,7 +228,7 @@ void xen_vcpu_setup(int cpu)
per_cpu(xen_vcpu, cpu) =
&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
- if (!have_vcpu_info_placement) {
+ if (!xen_have_vcpu_info_placement) {
if (cpu >= MAX_VIRT_CPUS)
clamp_max_cpus();
return;
@@ -251,7 +251,7 @@ void xen_vcpu_setup(int cpu)
if (err) {
printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
- have_vcpu_info_placement = 0;
+ xen_have_vcpu_info_placement = 0;
clamp_max_cpus();
} else {
/* This cpu is using the registered vcpu info, even if
@@ -280,7 +280,7 @@ void xen_vcpu_restore(void)
xen_setup_runstate_info(cpu);
- if (have_vcpu_info_placement)
+ if (xen_have_vcpu_info_placement)
xen_vcpu_setup(cpu);
if (other_cpu && is_up &&
@@ -1159,7 +1159,7 @@ void xen_setup_vcpu_info_placement(void)
* xen_vcpu_setup managed to place the vcpu_info within the
* percpu area for all cpus, so make use of it.
*/
- if (have_vcpu_info_placement) {
+ if (xen_have_vcpu_info_placement) {
pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
@@ -1178,7 +1178,7 @@ static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
#define SITE(op, x) \
case PARAVIRT_PATCH(op.x): \
- if (have_vcpu_info_placement) { \
+ if (xen_have_vcpu_info_placement) { \
start = (char *)xen_##x##_direct; \
end = xen_##x##_direct_end; \
reloc = xen_##x##_direct_reloc; \
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index f6a41c4..2b162f6 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -76,6 +76,8 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
bool xen_vcpu_stolen(int vcpu);
+extern int xen_have_vcpu_info_placement;
+
void xen_vcpu_setup(int cpu);
void xen_setup_vcpu_info_placement(void);
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 03/21] x86/xen: add CONFIG_XEN_PV to Kconfig
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
2017-03-02 17:53 ` [PATCH v2 01/21] x86/xen: separate PV and HVM hypervisors Vitaly Kuznetsov
2017-03-02 17:53 ` [PATCH v2 02/21] x86/xen: globalize have_vcpu_info_placement Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-08 15:12 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 04/21] x86/xen: split off enlighten_pvh.c Vitaly Kuznetsov
` (18 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
All code to supprot Xen PV will get under this new option. For the
beginning, check for it in the common code.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/kernel/cpu/hypervisor.c | 4 +++-
arch/x86/kernel/process_64.c | 2 +-
arch/x86/xen/Kconfig | 23 ++++++++++++++++++-----
3 files changed, 22 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index a77f18d..ce6fcc3 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -28,8 +28,10 @@
static const __initconst struct hypervisor_x86 * const hypervisors[] =
{
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PV
&x86_hyper_xen_pv,
+#endif
+#ifdef CONFIG_XEN_PVHVM
&x86_hyper_xen_hvm,
#endif
&x86_hyper_vmware,
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index a61e141..5e8d129 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -438,7 +438,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV))
__switch_to_xtra(prev_p, next_p, tss);
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PV
/*
* On Xen PV, IOPL bits in pt_regs->flags have no effect, and
* current_pt_regs()->flags may not match the current task's
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 76b6dbd..c387560 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -6,7 +6,6 @@ config XEN
bool "Xen guest support"
depends on PARAVIRT
select PARAVIRT_CLOCK
- select XEN_HAVE_PVMMU
select XEN_HAVE_VPMU
depends on X86_64 || (X86_32 && X86_PAE)
depends on X86_LOCAL_APIC && X86_TSC
@@ -15,18 +14,32 @@ config XEN
kernel to boot in a paravirtualized environment under the
Xen hypervisor.
+config XEN_PV
+ bool "Xen PV guest support"
+ default y
+ depends on XEN
+ help
+ Support running as a Xen PV guest.
+
config XEN_DOM0
- def_bool y
- depends on XEN && PCI_XEN && SWIOTLB_XEN
+ bool "Xen PV Dom0 support"
+ default y
+ depends on XEN_PV && PCI_XEN && SWIOTLB_XEN
depends on X86_IO_APIC && ACPI && PCI
+ select XEN_HAVE_PVMMU
+ help
+ Support running as a Xen PV Dom0 guest.
config XEN_PVHVM
- def_bool y
+ bool "Xen PVHVM guest support"
+ default y
depends on XEN && PCI && X86_LOCAL_APIC
+ help
+ Support running as a Xen PVHVM guest.
config XEN_512GB
bool "Limit Xen pv-domain memory to 512GB"
- depends on XEN && X86_64
+ depends on XEN_PV && X86_64
default y
help
Limit paravirtualized user domains to 512GB of RAM.
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* Re: [PATCH v2 03/21] x86/xen: add CONFIG_XEN_PV to Kconfig
2017-03-02 17:53 ` [PATCH v2 03/21] x86/xen: add CONFIG_XEN_PV to Kconfig Vitaly Kuznetsov
@ 2017-03-08 15:12 ` Juergen Gross
0 siblings, 0 replies; 44+ messages in thread
From: Juergen Gross @ 2017-03-08 15:12 UTC (permalink / raw)
To: Vitaly Kuznetsov, xen-devel
Cc: x86, linux-kernel, Boris Ostrovsky, Andrew Jones
On 02/03/17 18:53, Vitaly Kuznetsov wrote:
> All code to supprot Xen PV will get under this new option. For the
s/supprot/support/
> beginning, check for it in the common code.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> arch/x86/kernel/cpu/hypervisor.c | 4 +++-
> arch/x86/kernel/process_64.c | 2 +-
> arch/x86/xen/Kconfig | 23 ++++++++++++++++++-----
> 3 files changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
> index a77f18d..ce6fcc3 100644
> --- a/arch/x86/kernel/cpu/hypervisor.c
> +++ b/arch/x86/kernel/cpu/hypervisor.c
> @@ -28,8 +28,10 @@
>
> static const __initconst struct hypervisor_x86 * const hypervisors[] =
> {
> -#ifdef CONFIG_XEN
> +#ifdef CONFIG_XEN_PV
> &x86_hyper_xen_pv,
> +#endif
> +#ifdef CONFIG_XEN_PVHVM
> &x86_hyper_xen_hvm,
> #endif
> &x86_hyper_vmware,
> diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
> index a61e141..5e8d129 100644
> --- a/arch/x86/kernel/process_64.c
> +++ b/arch/x86/kernel/process_64.c
> @@ -438,7 +438,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
> task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV))
> __switch_to_xtra(prev_p, next_p, tss);
>
> -#ifdef CONFIG_XEN
> +#ifdef CONFIG_XEN_PV
> /*
> * On Xen PV, IOPL bits in pt_regs->flags have no effect, and
> * current_pt_regs()->flags may not match the current task's
> diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
> index 76b6dbd..c387560 100644
> --- a/arch/x86/xen/Kconfig
> +++ b/arch/x86/xen/Kconfig
> @@ -6,7 +6,6 @@ config XEN
> bool "Xen guest support"
> depends on PARAVIRT
> select PARAVIRT_CLOCK
> - select XEN_HAVE_PVMMU
> select XEN_HAVE_VPMU
> depends on X86_64 || (X86_32 && X86_PAE)
> depends on X86_LOCAL_APIC && X86_TSC
> @@ -15,18 +14,32 @@ config XEN
> kernel to boot in a paravirtualized environment under the
> Xen hypervisor.
>
> +config XEN_PV
> + bool "Xen PV guest support"
> + default y
> + depends on XEN
select XEN_HAVE_PVMMU is missing ...
> + help
> + Support running as a Xen PV guest.
> +
> config XEN_DOM0
> - def_bool y
> - depends on XEN && PCI_XEN && SWIOTLB_XEN
> + bool "Xen PV Dom0 support"
> + default y
> + depends on XEN_PV && PCI_XEN && SWIOTLB_XEN
> depends on X86_IO_APIC && ACPI && PCI
> + select XEN_HAVE_PVMMU
... and can be dropped here
Juergen
^ permalink raw reply [flat|nested] 44+ messages in thread
* [PATCH v2 04/21] x86/xen: split off enlighten_pvh.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (2 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 03/21] x86/xen: add CONFIG_XEN_PV to Kconfig Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-08 15:14 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 05/21] x86/xen: split off enlighten_hvm.c Vitaly Kuznetsov
` (17 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Create enlighten_pvh.c by splitting off PVH related code from enlighten.c,
put it under CONFIG_XEN_PVH.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Makefile | 2 +
arch/x86/xen/enlighten.c | 110 -----------------------------------------
arch/x86/xen/enlighten_pvh.c | 114 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+), 110 deletions(-)
create mode 100644 arch/x86/xen/enlighten_pvh.c
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index cb0164a..348128b 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -15,6 +15,8 @@ obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
grant-table.o suspend.o platform-pci-unplug.o \
p2m.o apic.o pmu.o
+obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
+
obj-$(CONFIG_EVENT_TRACING) += trace.o
obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index de77be9..d66debd 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -179,20 +179,6 @@ struct tls_descs {
*/
static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
-#ifdef CONFIG_XEN_PVH
-/*
- * PVH variables.
- *
- * xen_pvh and pvh_bootparams need to live in data segment since they
- * are used after startup_{32|64}, which clear .bss, are invoked.
- */
-bool xen_pvh __attribute__((section(".data"))) = 0;
-struct boot_params pvh_bootparams __attribute__((section(".data")));
-
-struct hvm_start_info pvh_start_info;
-unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
-#endif
-
static void clamp_max_cpus(void)
{
#ifdef CONFIG_SMP
@@ -1674,102 +1660,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
#endif
}
-#ifdef CONFIG_XEN_PVH
-
-static void xen_pvh_arch_setup(void)
-{
-#ifdef CONFIG_ACPI
- /* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */
- if (nr_ioapics == 0)
- acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
-#endif
-}
-
-static void __init init_pvh_bootparams(void)
-{
- struct xen_memory_map memmap;
- unsigned int i;
- int rc;
-
- memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
-
- memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_map);
- set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_map);
- rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
- if (rc) {
- xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
- BUG();
- }
-
- if (memmap.nr_entries < E820MAX - 1) {
- pvh_bootparams.e820_map[memmap.nr_entries].addr =
- ISA_START_ADDRESS;
- pvh_bootparams.e820_map[memmap.nr_entries].size =
- ISA_END_ADDRESS - ISA_START_ADDRESS;
- pvh_bootparams.e820_map[memmap.nr_entries].type =
- E820_RESERVED;
- memmap.nr_entries++;
- } else
- xen_raw_printk("Warning: Can fit ISA range into e820\n");
-
- sanitize_e820_map(pvh_bootparams.e820_map,
- ARRAY_SIZE(pvh_bootparams.e820_map),
- &memmap.nr_entries);
-
- pvh_bootparams.e820_entries = memmap.nr_entries;
- for (i = 0; i < pvh_bootparams.e820_entries; i++)
- e820_add_region(pvh_bootparams.e820_map[i].addr,
- pvh_bootparams.e820_map[i].size,
- pvh_bootparams.e820_map[i].type);
-
- pvh_bootparams.hdr.cmd_line_ptr =
- pvh_start_info.cmdline_paddr;
-
- /* The first module is always ramdisk. */
- if (pvh_start_info.nr_modules) {
- struct hvm_modlist_entry *modaddr =
- __va(pvh_start_info.modlist_paddr);
- pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
- pvh_bootparams.hdr.ramdisk_size = modaddr->size;
- }
-
- /*
- * See Documentation/x86/boot.txt.
- *
- * Version 2.12 supports Xen entry point but we will use default x86/PC
- * environment (i.e. hardware_subarch 0).
- */
- pvh_bootparams.hdr.version = 0x212;
- pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */
-}
-
-/*
- * This routine (and those that it might call) should not use
- * anything that lives in .bss since that segment will be cleared later.
- */
-void __init xen_prepare_pvh(void)
-{
- u32 msr;
- u64 pfn;
-
- if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
- xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
- pvh_start_info.magic);
- BUG();
- }
-
- xen_pvh = 1;
-
- msr = cpuid_ebx(xen_cpuid_base() + 2);
- pfn = __pa(hypercall_page);
- wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
-
- init_pvh_bootparams();
-
- x86_init.oem.arch_setup = xen_pvh_arch_setup;
-}
-#endif
-
void __ref xen_hvm_init_shared_info(void)
{
int cpu;
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c
new file mode 100644
index 0000000..ba534ca
--- /dev/null
+++ b/arch/x86/xen/enlighten_pvh.c
@@ -0,0 +1,114 @@
+#include <linux/acpi.h>
+
+#include <xen/hvc-console.h>
+
+#include <asm/hypervisor.h>
+
+#include <asm/xen/interface.h>
+#include <asm/xen/hypercall.h>
+
+#include <xen/interface/memory.h>
+#include <xen/interface/hvm/start_info.h>
+
+/*
+ * PVH variables.
+ *
+ * xen_pvh and pvh_bootparams need to live in data segment since they
+ * are used after startup_{32|64}, which clear .bss, are invoked.
+ */
+bool xen_pvh __attribute__((section(".data"))) = 0;
+struct boot_params pvh_bootparams __attribute__((section(".data")));
+
+struct hvm_start_info pvh_start_info;
+unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
+
+static void xen_pvh_arch_setup(void)
+{
+ /* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */
+ if (nr_ioapics == 0)
+ acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
+}
+
+static void __init init_pvh_bootparams(void)
+{
+ struct xen_memory_map memmap;
+ unsigned int i;
+ int rc;
+
+ memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
+
+ memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_map);
+ set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_map);
+ rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
+ if (rc) {
+ xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
+ BUG();
+ }
+
+ if (memmap.nr_entries < E820MAX - 1) {
+ pvh_bootparams.e820_map[memmap.nr_entries].addr =
+ ISA_START_ADDRESS;
+ pvh_bootparams.e820_map[memmap.nr_entries].size =
+ ISA_END_ADDRESS - ISA_START_ADDRESS;
+ pvh_bootparams.e820_map[memmap.nr_entries].type =
+ E820_RESERVED;
+ memmap.nr_entries++;
+ } else
+ xen_raw_printk("Warning: Can fit ISA range into e820\n");
+
+ sanitize_e820_map(pvh_bootparams.e820_map,
+ ARRAY_SIZE(pvh_bootparams.e820_map),
+ &memmap.nr_entries);
+
+ pvh_bootparams.e820_entries = memmap.nr_entries;
+ for (i = 0; i < pvh_bootparams.e820_entries; i++)
+ e820_add_region(pvh_bootparams.e820_map[i].addr,
+ pvh_bootparams.e820_map[i].size,
+ pvh_bootparams.e820_map[i].type);
+
+ pvh_bootparams.hdr.cmd_line_ptr =
+ pvh_start_info.cmdline_paddr;
+
+ /* The first module is always ramdisk. */
+ if (pvh_start_info.nr_modules) {
+ struct hvm_modlist_entry *modaddr =
+ __va(pvh_start_info.modlist_paddr);
+ pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
+ pvh_bootparams.hdr.ramdisk_size = modaddr->size;
+ }
+
+ /*
+ * See Documentation/x86/boot.txt.
+ *
+ * Version 2.12 supports Xen entry point but we will use default x86/PC
+ * environment (i.e. hardware_subarch 0).
+ */
+ pvh_bootparams.hdr.version = 0x212;
+ pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */
+}
+
+/*
+ * This routine (and those that it might call) should not use
+ * anything that lives in .bss since that segment will be cleared later.
+ */
+void __init xen_prepare_pvh(void)
+{
+ u32 msr;
+ u64 pfn;
+
+ if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
+ xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
+ pvh_start_info.magic);
+ BUG();
+ }
+
+ xen_pvh = 1;
+
+ msr = cpuid_ebx(xen_cpuid_base() + 2);
+ pfn = __pa(hypercall_page);
+ wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
+
+ init_pvh_bootparams();
+
+ x86_init.oem.arch_setup = xen_pvh_arch_setup;
+}
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 05/21] x86/xen: split off enlighten_hvm.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (3 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 04/21] x86/xen: split off enlighten_pvh.c Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-08 15:16 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 06/21] x86/xen: split off enlighten_pv.c Vitaly Kuznetsov
` (16 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Move PVHVM related code to enlighten_hvm.c. Three functions:
xen_cpuhp_setup(), xen_reboot(), xen_emergency_restart() are shared, drop
static qualifier from them. These functions will go to common code once
it is split from enlighten.c.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Makefile | 1 +
arch/x86/xen/enlighten.c | 209 +-----------------------------------------
arch/x86/xen/enlighten_hvm.c | 210 +++++++++++++++++++++++++++++++++++++++++++
arch/x86/xen/xen-ops.h | 6 ++
4 files changed, 221 insertions(+), 205 deletions(-)
create mode 100644 arch/x86/xen/enlighten_hvm.c
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 348128b..1bca75b 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -15,6 +15,7 @@ obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
grant-table.o suspend.o platform-pci-unplug.o \
p2m.o apic.o pmu.o
+obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index d66debd..0cd99ad 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -45,10 +45,8 @@
#include <xen/interface/memory.h>
#include <xen/interface/nmi.h>
#include <xen/interface/xen-mca.h>
-#include <xen/interface/hvm/start_info.h>
#include <xen/features.h>
#include <xen/page.h>
-#include <xen/hvm.h>
#include <xen/hvc-console.h>
#include <xen/acpi.h>
@@ -140,10 +138,8 @@ void *xen_initial_gdt;
RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
static int xen_cpu_up_prepare_pv(unsigned int cpu);
-static int xen_cpu_up_prepare_hvm(unsigned int cpu);
static int xen_cpu_up_online(unsigned int cpu);
static int xen_cpu_dead_pv(unsigned int cpu);
-static int xen_cpu_dead_hvm(unsigned int cpu);
/*
* Point at some empty memory to start with. We map the real shared_info
@@ -1282,7 +1278,7 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.end_context_switch = xen_end_context_switch,
};
-static void xen_reboot(int reason)
+void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = reason };
int cpu;
@@ -1299,7 +1295,7 @@ static void xen_restart(char *msg)
xen_reboot(SHUTDOWN_reboot);
}
-static void xen_emergency_restart(void)
+void xen_emergency_restart(void)
{
xen_reboot(SHUTDOWN_reboot);
}
@@ -1435,8 +1431,8 @@ static void __init xen_dom0_set_legacy_features(void)
x86_platform.legacy.rtc = 1;
}
-static int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
- int (*cpu_dead_cb)(unsigned int))
+int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
+ int (*cpu_dead_cb)(unsigned int))
{
int rc;
@@ -1660,79 +1656,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
#endif
}
-void __ref xen_hvm_init_shared_info(void)
-{
- int cpu;
- struct xen_add_to_physmap xatp;
- static struct shared_info *shared_info_page = 0;
-
- if (!shared_info_page)
- shared_info_page = (struct shared_info *)
- extend_brk(PAGE_SIZE, PAGE_SIZE);
- xatp.domid = DOMID_SELF;
- xatp.idx = 0;
- xatp.space = XENMAPSPACE_shared_info;
- xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
- if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
- BUG();
-
- HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
-
- /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
- * page, we use it in the event channel upcall and in some pvclock
- * related functions. We don't need the vcpu_info placement
- * optimizations because we don't use any pv_mmu or pv_irq op on
- * HVM.
- * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
- * online but xen_hvm_init_shared_info is run at resume time too and
- * in that case multiple vcpus might be online. */
- for_each_online_cpu(cpu) {
- /* Leave it to be NULL. */
- if (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS)
- continue;
- per_cpu(xen_vcpu, cpu) =
- &HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
- }
-}
-
-#ifdef CONFIG_XEN_PVHVM
-static void __init init_hvm_pv_info(void)
-{
- int major, minor;
- uint32_t eax, ebx, ecx, edx, base;
-
- base = xen_cpuid_base();
- eax = cpuid_eax(base + 1);
-
- major = eax >> 16;
- minor = eax & 0xffff;
- printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
-
- xen_domain_type = XEN_HVM_DOMAIN;
-
- /* PVH set up hypercall page in xen_prepare_pvh(). */
- if (xen_pvh_domain())
- pv_info.name = "Xen PVH";
- else {
- u64 pfn;
- uint32_t msr;
-
- pv_info.name = "Xen HVM";
- msr = cpuid_ebx(base + 2);
- pfn = __pa(hypercall_page);
- wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
- }
-
- xen_setup_features();
-
- cpuid(base + 4, &eax, &ebx, &ecx, &edx);
- if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT)
- this_cpu_write(xen_vcpu_id, ebx);
- else
- this_cpu_write(xen_vcpu_id, smp_processor_id());
-}
-#endif
-
static int xen_cpu_up_prepare_pv(unsigned int cpu)
{
int rc;
@@ -1748,37 +1671,6 @@ static int xen_cpu_up_prepare_pv(unsigned int cpu)
return 0;
}
-static int xen_cpu_up_prepare_hvm(unsigned int cpu)
-{
- int rc;
-
- /*
- * This can happen if CPU was offlined earlier and
- * offlining timed out in common_cpu_die().
- */
- if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
- xen_smp_intr_free(cpu);
- xen_uninit_lock_cpu(cpu);
- }
-
- if (cpu_acpi_id(cpu) != U32_MAX)
- per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
- else
- per_cpu(xen_vcpu_id, cpu) = cpu;
- xen_vcpu_setup(cpu);
-
- if (xen_feature(XENFEAT_hvm_safe_pvclock))
- xen_setup_timer(cpu);
-
- rc = xen_smp_intr_init(cpu);
- if (rc) {
- WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
- cpu, rc);
- return rc;
- }
- return 0;
-}
-
static int xen_cpu_dead_pv(unsigned int cpu)
{
xen_smp_intr_free(cpu);
@@ -1788,75 +1680,12 @@ static int xen_cpu_dead_pv(unsigned int cpu)
return 0;
}
-static int xen_cpu_dead_hvm(unsigned int cpu)
-{
- xen_smp_intr_free(cpu);
-
- if (xen_feature(XENFEAT_hvm_safe_pvclock))
- xen_teardown_timer(cpu);
-
- return 0;
-}
-
static int xen_cpu_up_online(unsigned int cpu)
{
xen_init_lock_cpu(cpu);
return 0;
}
-#ifdef CONFIG_XEN_PVHVM
-#ifdef CONFIG_KEXEC_CORE
-static void xen_hvm_shutdown(void)
-{
- native_machine_shutdown();
- if (kexec_in_progress)
- xen_reboot(SHUTDOWN_soft_reset);
-}
-
-static void xen_hvm_crash_shutdown(struct pt_regs *regs)
-{
- native_machine_crash_shutdown(regs);
- xen_reboot(SHUTDOWN_soft_reset);
-}
-#endif
-
-static void __init xen_hvm_guest_init(void)
-{
- if (xen_pv_domain())
- return;
-
- init_hvm_pv_info();
-
- xen_hvm_init_shared_info();
-
- xen_panic_handler_init();
-
- BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
-
- xen_hvm_smp_init();
- WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm));
- xen_unplug_emulated_devices();
- x86_init.irqs.intr_init = xen_init_IRQ;
- xen_hvm_init_time_ops();
- xen_hvm_init_mmu_ops();
-
- if (xen_pvh_domain())
- machine_ops.emergency_restart = xen_emergency_restart;
-#ifdef CONFIG_KEXEC_CORE
- machine_ops.shutdown = xen_hvm_shutdown;
- machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
-#endif
-}
-#endif
-
-static bool xen_nopv = false;
-static __init int xen_parse_nopv(char *arg)
-{
- xen_nopv = true;
- return 0;
-}
-early_param("xen_nopv", xen_parse_nopv);
-
static uint32_t __init xen_platform_pv(void)
{
if (xen_pv_domain())
@@ -1865,28 +1694,6 @@ static uint32_t __init xen_platform_pv(void)
return 0;
}
-static uint32_t __init xen_platform_hvm(void)
-{
- if (xen_pv_domain() || xen_nopv)
- return 0;
-
- return xen_cpuid_base();
-}
-
-bool xen_hvm_need_lapic(void)
-{
- if (xen_nopv)
- return false;
- if (xen_pv_domain())
- return false;
- if (!xen_hvm_domain())
- return false;
- if (xen_feature(XENFEAT_hvm_pirqs))
- return false;
- return true;
-}
-EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
-
static void xen_set_cpu_features(struct cpuinfo_x86 *c)
{
clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
@@ -1940,14 +1747,6 @@ const struct hypervisor_x86 x86_hyper_xen_pv = {
};
EXPORT_SYMBOL(x86_hyper_xen_pv);
-const struct hypervisor_x86 x86_hyper_xen_hvm = {
- .name = "Xen HVM",
- .detect = xen_platform_hvm,
- .init_platform = xen_hvm_guest_init,
- .x2apic_available = xen_x2apic_para_available,
-};
-EXPORT_SYMBOL(x86_hyper_xen_hvm);
-
#ifdef CONFIG_HOTPLUG_CPU
void xen_arch_register_cpu(int num)
{
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
new file mode 100644
index 0000000..a8f4d7e
--- /dev/null
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -0,0 +1,210 @@
+#include <linux/cpu.h>
+#include <linux/kexec.h>
+
+#include <xen/features.h>
+#include <xen/events.h>
+#include <xen/interface/memory.h>
+
+#include <asm/reboot.h>
+#include <asm/setup.h>
+#include <asm/hypervisor.h>
+
+#include <asm/xen/cpuid.h>
+#include <asm/xen/hypervisor.h>
+
+#include "xen-ops.h"
+#include "mmu.h"
+#include "smp.h"
+
+void __ref xen_hvm_init_shared_info(void)
+{
+ int cpu;
+ struct xen_add_to_physmap xatp;
+ static struct shared_info *shared_info_page;
+
+ if (!shared_info_page)
+ shared_info_page = (struct shared_info *)
+ extend_brk(PAGE_SIZE, PAGE_SIZE);
+ xatp.domid = DOMID_SELF;
+ xatp.idx = 0;
+ xatp.space = XENMAPSPACE_shared_info;
+ xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
+ if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
+ BUG();
+
+ HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
+
+ /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
+ * page, we use it in the event channel upcall and in some pvclock
+ * related functions. We don't need the vcpu_info placement
+ * optimizations because we don't use any pv_mmu or pv_irq op on
+ * HVM.
+ * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
+ * online but xen_hvm_init_shared_info is run at resume time too and
+ * in that case multiple vcpus might be online. */
+ for_each_online_cpu(cpu) {
+ /* Leave it to be NULL. */
+ if (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS)
+ continue;
+ per_cpu(xen_vcpu, cpu) =
+ &HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
+ }
+}
+
+static void __init init_hvm_pv_info(void)
+{
+ int major, minor;
+ uint32_t eax, ebx, ecx, edx, base;
+
+ base = xen_cpuid_base();
+ eax = cpuid_eax(base + 1);
+
+ major = eax >> 16;
+ minor = eax & 0xffff;
+ printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
+
+ xen_domain_type = XEN_HVM_DOMAIN;
+
+ /* PVH set up hypercall page in xen_prepare_pvh(). */
+ if (xen_pvh_domain())
+ pv_info.name = "Xen PVH";
+ else {
+ u64 pfn;
+ uint32_t msr;
+
+ pv_info.name = "Xen HVM";
+ msr = cpuid_ebx(base + 2);
+ pfn = __pa(hypercall_page);
+ wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
+ }
+
+ xen_setup_features();
+
+ cpuid(base + 4, &eax, &ebx, &ecx, &edx);
+ if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT)
+ this_cpu_write(xen_vcpu_id, ebx);
+ else
+ this_cpu_write(xen_vcpu_id, smp_processor_id());
+}
+
+#ifdef CONFIG_KEXEC_CORE
+static void xen_hvm_shutdown(void)
+{
+ native_machine_shutdown();
+ if (kexec_in_progress)
+ xen_reboot(SHUTDOWN_soft_reset);
+}
+
+static void xen_hvm_crash_shutdown(struct pt_regs *regs)
+{
+ native_machine_crash_shutdown(regs);
+ xen_reboot(SHUTDOWN_soft_reset);
+}
+#endif
+
+static int xen_cpu_up_prepare_hvm(unsigned int cpu)
+{
+ int rc;
+
+ /*
+ * This can happen if CPU was offlined earlier and
+ * offlining timed out in common_cpu_die().
+ */
+ if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) {
+ xen_smp_intr_free(cpu);
+ xen_uninit_lock_cpu(cpu);
+ }
+
+ if (cpu_acpi_id(cpu) != U32_MAX)
+ per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
+ else
+ per_cpu(xen_vcpu_id, cpu) = cpu;
+ xen_vcpu_setup(cpu);
+
+ if (xen_feature(XENFEAT_hvm_safe_pvclock))
+ xen_setup_timer(cpu);
+
+ rc = xen_smp_intr_init(cpu);
+ if (rc) {
+ WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
+ cpu, rc);
+ return rc;
+ }
+ return 0;
+}
+
+static int xen_cpu_dead_hvm(unsigned int cpu)
+{
+ xen_smp_intr_free(cpu);
+
+ if (xen_feature(XENFEAT_hvm_safe_pvclock))
+ xen_teardown_timer(cpu);
+
+ return 0;
+}
+
+static void __init xen_hvm_guest_init(void)
+{
+ if (xen_pv_domain())
+ return;
+
+ init_hvm_pv_info();
+
+ xen_hvm_init_shared_info();
+
+ xen_panic_handler_init();
+
+ BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
+
+ xen_hvm_smp_init();
+ WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm));
+ xen_unplug_emulated_devices();
+ x86_init.irqs.intr_init = xen_init_IRQ;
+ xen_hvm_init_time_ops();
+ xen_hvm_init_mmu_ops();
+
+ if (xen_pvh_domain())
+ machine_ops.emergency_restart = xen_emergency_restart;
+#ifdef CONFIG_KEXEC_CORE
+ machine_ops.shutdown = xen_hvm_shutdown;
+ machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
+#endif
+}
+
+static bool xen_nopv;
+static __init int xen_parse_nopv(char *arg)
+{
+ xen_nopv = true;
+ return 0;
+}
+early_param("xen_nopv", xen_parse_nopv);
+
+bool xen_hvm_need_lapic(void)
+{
+ if (xen_nopv)
+ return false;
+ if (xen_pv_domain())
+ return false;
+ if (!xen_hvm_domain())
+ return false;
+ if (xen_feature(XENFEAT_hvm_pirqs))
+ return false;
+ return true;
+}
+EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
+
+static uint32_t __init xen_platform_hvm(void)
+{
+ if (xen_pv_domain() || xen_nopv)
+ return 0;
+
+ return xen_cpuid_base();
+}
+
+const struct hypervisor_x86 x86_hyper_xen_hvm = {
+ .name = "Xen HVM",
+ .detect = xen_platform_hvm,
+ .init_platform = xen_hvm_guest_init,
+ .x2apic_available = xen_x2apic_para_available,
+};
+EXPORT_SYMBOL(x86_hyper_xen_hvm);
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 2b162f6..7baeb04 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -148,4 +148,10 @@ __visible void xen_adjust_exception_frame(void);
extern int xen_panic_handler_init(void);
+extern int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
+ int (*cpu_dead_cb)(unsigned int));
+
+extern void xen_reboot(int reason);
+extern void xen_emergency_restart(void);
+
#endif /* XEN_OPS_H */
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* Re: [PATCH v2 05/21] x86/xen: split off enlighten_hvm.c
2017-03-02 17:53 ` [PATCH v2 05/21] x86/xen: split off enlighten_hvm.c Vitaly Kuznetsov
@ 2017-03-08 15:16 ` Juergen Gross
0 siblings, 0 replies; 44+ messages in thread
From: Juergen Gross @ 2017-03-08 15:16 UTC (permalink / raw)
To: Vitaly Kuznetsov, xen-devel
Cc: x86, linux-kernel, Boris Ostrovsky, Andrew Jones
On 02/03/17 18:53, Vitaly Kuznetsov wrote:
> Move PVHVM related code to enlighten_hvm.c. Three functions:
> xen_cpuhp_setup(), xen_reboot(), xen_emergency_restart() are shared, drop
> static qualifier from them. These functions will go to common code once
> it is split from enlighten.c.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
^ permalink raw reply [flat|nested] 44+ messages in thread
* [PATCH v2 06/21] x86/xen: split off enlighten_pv.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (4 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 05/21] x86/xen: split off enlighten_hvm.c Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-08 15:18 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 07/21] x86/xen: split xen_smp_intr_init()/xen_smp_intr_free() Vitaly Kuznetsov
` (15 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Basically, enlighten.c is renamed to enlighten_pv.c and some code moved
out to common enlighten.c.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Makefile | 4 +-
arch/x86/xen/enlighten.c | 1626 ++-----------------------------------------
arch/x86/xen/enlighten_pv.c | 1552 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 1596 insertions(+), 1586 deletions(-)
create mode 100644 arch/x86/xen/enlighten_pv.c
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 1bca75b..5ca8d3eb 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -7,13 +7,13 @@ endif
# Make sure early boot has no stackprotector
nostackp := $(call cc-option, -fno-stack-protector)
-CFLAGS_enlighten.o := $(nostackp)
+CFLAGS_enlighten_pv.o := $(nostackp)
CFLAGS_mmu.o := $(nostackp)
obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
time.o xen-asm.o xen-asm_$(BITS).o \
grant-table.o suspend.o platform-pci-unplug.o \
- p2m.o apic.o pmu.o
+ p2m.o apic.o pmu.o enlighten_pv.o
obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 0cd99ad..4bd20bb 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1,92 +1,15 @@
-/*
- * Core of Xen paravirt_ops implementation.
- *
- * This file contains the xen_paravirt_ops structure itself, and the
- * implementations for:
- * - privileged instructions
- * - interrupt flags
- * - segment operations
- * - booting and setup
- *
- * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
- */
-
#include <linux/cpu.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/preempt.h>
-#include <linux/hardirq.h>
-#include <linux/percpu.h>
-#include <linux/delay.h>
-#include <linux/start_kernel.h>
-#include <linux/sched.h>
-#include <linux/kprobes.h>
-#include <linux/bootmem.h>
-#include <linux/export.h>
-#include <linux/mm.h>
-#include <linux/page-flags.h>
-#include <linux/highmem.h>
-#include <linux/console.h>
-#include <linux/pci.h>
-#include <linux/gfp.h>
-#include <linux/memblock.h>
-#include <linux/edd.h>
-#include <linux/frame.h>
-
#include <linux/kexec.h>
-#include <xen/xen.h>
-#include <xen/events.h>
-#include <xen/interface/xen.h>
-#include <xen/interface/version.h>
-#include <xen/interface/physdev.h>
-#include <xen/interface/vcpu.h>
-#include <xen/interface/memory.h>
-#include <xen/interface/nmi.h>
-#include <xen/interface/xen-mca.h>
#include <xen/features.h>
#include <xen/page.h>
-#include <xen/hvc-console.h>
-#include <xen/acpi.h>
-#include <asm/paravirt.h>
-#include <asm/apic.h>
-#include <asm/page.h>
-#include <asm/xen/pci.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
-#include <asm/xen/cpuid.h>
-#include <asm/fixmap.h>
-#include <asm/processor.h>
-#include <asm/proto.h>
-#include <asm/msr-index.h>
-#include <asm/traps.h>
-#include <asm/setup.h>
-#include <asm/desc.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-#include <asm/reboot.h>
-#include <asm/stackprotector.h>
-#include <asm/hypervisor.h>
-#include <asm/mach_traps.h>
-#include <asm/mwait.h>
-#include <asm/pci_x86.h>
#include <asm/cpu.h>
-#ifdef CONFIG_ACPI
-#include <linux/acpi.h>
-#include <asm/acpi.h>
-#include <acpi/pdc_intel.h>
-#include <acpi/processor.h>
-#include <xen/interface/platform.h>
-#endif
-
#include "xen-ops.h"
-#include "mmu.h"
#include "smp.h"
-#include "multicalls.h"
#include "pmu.h"
EXPORT_SYMBOL_GPL(hypercall_page);
@@ -133,14 +56,6 @@ EXPORT_SYMBOL_GPL(xen_start_info);
struct shared_info xen_dummy_shared_info;
-void *xen_initial_gdt;
-
-RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
-
-static int xen_cpu_up_prepare_pv(unsigned int cpu);
-static int xen_cpu_up_online(unsigned int cpu);
-static int xen_cpu_dead_pv(unsigned int cpu);
-
/*
* Point at some empty memory to start with. We map the real shared_info
* page as soon as fixmap is up and running.
@@ -162,18 +77,30 @@ struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
*/
int xen_have_vcpu_info_placement = 1;
-struct tls_descs {
- struct desc_struct desc[3];
-};
+static int xen_cpu_up_online(unsigned int cpu)
+{
+ xen_init_lock_cpu(cpu);
+ return 0;
+}
-/*
- * Updating the 3 TLS descriptors in the GDT on every task switch is
- * surprisingly expensive so we avoid updating them if they haven't
- * changed. Since Xen writes different descriptors than the one
- * passed in the update_descriptor hypercall we keep shadow copies to
- * compare against.
- */
-static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
+int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
+ int (*cpu_dead_cb)(unsigned int))
+{
+ int rc;
+
+ rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
+ "x86/xen/hvm_guest:prepare",
+ cpu_up_prepare_cb, cpu_dead_cb);
+ if (rc >= 0) {
+ rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
+ "x86/xen/hvm_guest:online",
+ xen_cpu_up_online, NULL);
+ if (rc < 0)
+ cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);
+ }
+
+ return rc >= 0 ? 0 : rc;
+}
static void clamp_max_cpus(void)
{
@@ -242,1511 +169,42 @@ void xen_vcpu_setup(int cpu)
}
}
-/*
- * On restore, set the vcpu placement up again.
- * If it fails, then we're in a bad state, since
- * we can't back out from using it...
- */
-void xen_vcpu_restore(void)
+void xen_reboot(int reason)
{
+ struct sched_shutdown r = { .reason = reason };
int cpu;
- for_each_possible_cpu(cpu) {
- bool other_cpu = (cpu != smp_processor_id());
- bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu),
- NULL);
-
- if (other_cpu && is_up &&
- HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
- BUG();
-
- xen_setup_runstate_info(cpu);
-
- if (xen_have_vcpu_info_placement)
- xen_vcpu_setup(cpu);
-
- if (other_cpu && is_up &&
- HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
- BUG();
- }
-}
-
-static void __init xen_banner(void)
-{
- unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
- struct xen_extraversion extra;
- HYPERVISOR_xen_version(XENVER_extraversion, &extra);
-
- pr_info("Booting paravirtualized kernel %son %s\n",
- xen_feature(XENFEAT_auto_translated_physmap) ?
- "with PVH extensions " : "", pv_info.name);
- printk(KERN_INFO "Xen version: %d.%d%s%s\n",
- version >> 16, version & 0xffff, extra.extraversion,
- xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
-}
-/* Check if running on Xen version (major, minor) or later */
-bool
-xen_running_on_version_or_later(unsigned int major, unsigned int minor)
-{
- unsigned int version;
-
- if (!xen_domain())
- return false;
-
- version = HYPERVISOR_xen_version(XENVER_version, NULL);
- if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
- ((version >> 16) > major))
- return true;
- return false;
-}
-
-#define CPUID_THERM_POWER_LEAF 6
-#define APERFMPERF_PRESENT 0
-
-static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0;
-static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0;
-
-static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask;
-static __read_mostly unsigned int cpuid_leaf5_ecx_val;
-static __read_mostly unsigned int cpuid_leaf5_edx_val;
-
-static void xen_cpuid(unsigned int *ax, unsigned int *bx,
- unsigned int *cx, unsigned int *dx)
-{
- unsigned maskebx = ~0;
- unsigned maskecx = ~0;
- unsigned maskedx = ~0;
- unsigned setecx = 0;
- /*
- * Mask out inconvenient features, to try and disable as many
- * unsupported kernel subsystems as possible.
- */
- switch (*ax) {
- case 1:
- maskecx = cpuid_leaf1_ecx_mask;
- setecx = cpuid_leaf1_ecx_set_mask;
- maskedx = cpuid_leaf1_edx_mask;
- break;
-
- case CPUID_MWAIT_LEAF:
- /* Synthesize the values.. */
- *ax = 0;
- *bx = 0;
- *cx = cpuid_leaf5_ecx_val;
- *dx = cpuid_leaf5_edx_val;
- return;
-
- case CPUID_THERM_POWER_LEAF:
- /* Disabling APERFMPERF for kernel usage */
- maskecx = ~(1 << APERFMPERF_PRESENT);
- break;
-
- case 0xb:
- /* Suppress extended topology stuff */
- maskebx = 0;
- break;
- }
-
- asm(XEN_EMULATE_PREFIX "cpuid"
- : "=a" (*ax),
- "=b" (*bx),
- "=c" (*cx),
- "=d" (*dx)
- : "0" (*ax), "2" (*cx));
-
- *bx &= maskebx;
- *cx &= maskecx;
- *cx |= setecx;
- *dx &= maskedx;
-}
-STACK_FRAME_NON_STANDARD(xen_cpuid); /* XEN_EMULATE_PREFIX */
-
-static bool __init xen_check_mwait(void)
-{
-#ifdef CONFIG_ACPI
- struct xen_platform_op op = {
- .cmd = XENPF_set_processor_pminfo,
- .u.set_pminfo.id = -1,
- .u.set_pminfo.type = XEN_PM_PDC,
- };
- uint32_t buf[3];
- unsigned int ax, bx, cx, dx;
- unsigned int mwait_mask;
-
- /* We need to determine whether it is OK to expose the MWAIT
- * capability to the kernel to harvest deeper than C3 states from ACPI
- * _CST using the processor_harvest_xen.c module. For this to work, we
- * need to gather the MWAIT_LEAF values (which the cstate.c code
- * checks against). The hypervisor won't expose the MWAIT flag because
- * it would break backwards compatibility; so we will find out directly
- * from the hardware and hypercall.
- */
- if (!xen_initial_domain())
- return false;
-
- /*
- * When running under platform earlier than Xen4.2, do not expose
- * mwait, to avoid the risk of loading native acpi pad driver
- */
- if (!xen_running_on_version_or_later(4, 2))
- return false;
-
- ax = 1;
- cx = 0;
-
- native_cpuid(&ax, &bx, &cx, &dx);
-
- mwait_mask = (1 << (X86_FEATURE_EST % 32)) |
- (1 << (X86_FEATURE_MWAIT % 32));
-
- if ((cx & mwait_mask) != mwait_mask)
- return false;
-
- /* We need to emulate the MWAIT_LEAF and for that we need both
- * ecx and edx. The hypercall provides only partial information.
- */
-
- ax = CPUID_MWAIT_LEAF;
- bx = 0;
- cx = 0;
- dx = 0;
-
- native_cpuid(&ax, &bx, &cx, &dx);
-
- /* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so,
- * don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3.
- */
- buf[0] = ACPI_PDC_REVISION_ID;
- buf[1] = 1;
- buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP);
-
- set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
-
- if ((HYPERVISOR_platform_op(&op) == 0) &&
- (buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) {
- cpuid_leaf5_ecx_val = cx;
- cpuid_leaf5_edx_val = dx;
- }
- return true;
-#else
- return false;
-#endif
-}
-static void __init xen_init_cpuid_mask(void)
-{
- unsigned int ax, bx, cx, dx;
- unsigned int xsave_mask;
-
- cpuid_leaf1_edx_mask =
- ~((1 << X86_FEATURE_MTRR) | /* disable MTRR */
- (1 << X86_FEATURE_ACC)); /* thermal monitoring */
-
- if (!xen_initial_domain())
- cpuid_leaf1_edx_mask &=
- ~((1 << X86_FEATURE_ACPI)); /* disable ACPI */
-
- cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
-
- ax = 1;
- cx = 0;
- cpuid(1, &ax, &bx, &cx, &dx);
-
- xsave_mask =
- (1 << (X86_FEATURE_XSAVE % 32)) |
- (1 << (X86_FEATURE_OSXSAVE % 32));
-
- /* Xen will set CR4.OSXSAVE if supported and not disabled by force */
- if ((cx & xsave_mask) != xsave_mask)
- cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */
- if (xen_check_mwait())
- cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32));
-}
-
-static void xen_set_debugreg(int reg, unsigned long val)
-{
- HYPERVISOR_set_debugreg(reg, val);
-}
-
-static unsigned long xen_get_debugreg(int reg)
-{
- return HYPERVISOR_get_debugreg(reg);
-}
-
-static void xen_end_context_switch(struct task_struct *next)
-{
- xen_mc_flush();
- paravirt_end_context_switch(next);
-}
-
-static unsigned long xen_store_tr(void)
-{
- return 0;
-}
-
-/*
- * Set the page permissions for a particular virtual address. If the
- * address is a vmalloc mapping (or other non-linear mapping), then
- * find the linear mapping of the page and also set its protections to
- * match.
- */
-static void set_aliased_prot(void *v, pgprot_t prot)
-{
- int level;
- pte_t *ptep;
- pte_t pte;
- unsigned long pfn;
- struct page *page;
- unsigned char dummy;
-
- ptep = lookup_address((unsigned long)v, &level);
- BUG_ON(ptep == NULL);
-
- pfn = pte_pfn(*ptep);
- page = pfn_to_page(pfn);
-
- pte = pfn_pte(pfn, prot);
-
- /*
- * Careful: update_va_mapping() will fail if the virtual address
- * we're poking isn't populated in the page tables. We don't
- * need to worry about the direct map (that's always in the page
- * tables), but we need to be careful about vmap space. In
- * particular, the top level page table can lazily propagate
- * entries between processes, so if we've switched mms since we
- * vmapped the target in the first place, we might not have the
- * top-level page table entry populated.
- *
- * We disable preemption because we want the same mm active when
- * we probe the target and when we issue the hypercall. We'll
- * have the same nominal mm, but if we're a kernel thread, lazy
- * mm dropping could change our pgd.
- *
- * Out of an abundance of caution, this uses __get_user() to fault
- * in the target address just in case there's some obscure case
- * in which the target address isn't readable.
- */
-
- preempt_disable();
-
- probe_kernel_read(&dummy, v, 1);
-
- if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
- BUG();
-
- if (!PageHighMem(page)) {
- void *av = __va(PFN_PHYS(pfn));
-
- if (av != v)
- if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
- BUG();
- } else
- kmap_flush_unused();
-
- preempt_enable();
-}
-
-static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
-{
- const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
- int i;
-
- /*
- * We need to mark the all aliases of the LDT pages RO. We
- * don't need to call vm_flush_aliases(), though, since that's
- * only responsible for flushing aliases out the TLBs, not the
- * page tables, and Xen will flush the TLB for us if needed.
- *
- * To avoid confusing future readers: none of this is necessary
- * to load the LDT. The hypervisor only checks this when the
- * LDT is faulted in due to subsequent descriptor access.
- */
-
- for(i = 0; i < entries; i += entries_per_page)
- set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
-}
-
-static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
-{
- const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
- int i;
-
- for(i = 0; i < entries; i += entries_per_page)
- set_aliased_prot(ldt + i, PAGE_KERNEL);
-}
-
-static void xen_set_ldt(const void *addr, unsigned entries)
-{
- struct mmuext_op *op;
- struct multicall_space mcs = xen_mc_entry(sizeof(*op));
-
- trace_xen_cpu_set_ldt(addr, entries);
-
- op = mcs.args;
- op->cmd = MMUEXT_SET_LDT;
- op->arg1.linear_addr = (unsigned long)addr;
- op->arg2.nr_ents = entries;
-
- MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
-
- xen_mc_issue(PARAVIRT_LAZY_CPU);
-}
-
-static void xen_load_gdt(const struct desc_ptr *dtr)
-{
- unsigned long va = dtr->address;
- unsigned int size = dtr->size + 1;
- unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
- unsigned long frames[pages];
- int f;
-
- /*
- * A GDT can be up to 64k in size, which corresponds to 8192
- * 8-byte entries, or 16 4k pages..
- */
-
- BUG_ON(size > 65536);
- BUG_ON(va & ~PAGE_MASK);
-
- for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
- int level;
- pte_t *ptep;
- unsigned long pfn, mfn;
- void *virt;
-
- /*
- * The GDT is per-cpu and is in the percpu data area.
- * That can be virtually mapped, so we need to do a
- * page-walk to get the underlying MFN for the
- * hypercall. The page can also be in the kernel's
- * linear range, so we need to RO that mapping too.
- */
- ptep = lookup_address(va, &level);
- BUG_ON(ptep == NULL);
-
- pfn = pte_pfn(*ptep);
- mfn = pfn_to_mfn(pfn);
- virt = __va(PFN_PHYS(pfn));
-
- frames[f] = mfn;
-
- make_lowmem_page_readonly((void *)va);
- make_lowmem_page_readonly(virt);
- }
-
- if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
- BUG();
-}
-
-/*
- * load_gdt for early boot, when the gdt is only mapped once
- */
-static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
-{
- unsigned long va = dtr->address;
- unsigned int size = dtr->size + 1;
- unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
- unsigned long frames[pages];
- int f;
-
- /*
- * A GDT can be up to 64k in size, which corresponds to 8192
- * 8-byte entries, or 16 4k pages..
- */
-
- BUG_ON(size > 65536);
- BUG_ON(va & ~PAGE_MASK);
-
- for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
- pte_t pte;
- unsigned long pfn, mfn;
-
- pfn = virt_to_pfn(va);
- mfn = pfn_to_mfn(pfn);
-
- pte = pfn_pte(pfn, PAGE_KERNEL_RO);
-
- if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0))
- BUG();
-
- frames[f] = mfn;
- }
-
- if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
- BUG();
-}
-
-static inline bool desc_equal(const struct desc_struct *d1,
- const struct desc_struct *d2)
-{
- return d1->a == d2->a && d1->b == d2->b;
-}
-
-static void load_TLS_descriptor(struct thread_struct *t,
- unsigned int cpu, unsigned int i)
-{
- struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i];
- struct desc_struct *gdt;
- xmaddr_t maddr;
- struct multicall_space mc;
-
- if (desc_equal(shadow, &t->tls_array[i]))
- return;
-
- *shadow = t->tls_array[i];
-
- gdt = get_cpu_gdt_table(cpu);
- maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
- mc = __xen_mc_entry(0);
-
- MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
-}
-
-static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
-{
- /*
- * XXX sleazy hack: If we're being called in a lazy-cpu zone
- * and lazy gs handling is enabled, it means we're in a
- * context switch, and %gs has just been saved. This means we
- * can zero it out to prevent faults on exit from the
- * hypervisor if the next process has no %gs. Either way, it
- * has been saved, and the new value will get loaded properly.
- * This will go away as soon as Xen has been modified to not
- * save/restore %gs for normal hypercalls.
- *
- * On x86_64, this hack is not used for %gs, because gs points
- * to KERNEL_GS_BASE (and uses it for PDA references), so we
- * must not zero %gs on x86_64
- *
- * For x86_64, we need to zero %fs, otherwise we may get an
- * exception between the new %fs descriptor being loaded and
- * %fs being effectively cleared at __switch_to().
- */
- if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
-#ifdef CONFIG_X86_32
- lazy_load_gs(0);
-#else
- loadsegment(fs, 0);
-#endif
- }
-
- xen_mc_batch();
-
- load_TLS_descriptor(t, cpu, 0);
- load_TLS_descriptor(t, cpu, 1);
- load_TLS_descriptor(t, cpu, 2);
-
- xen_mc_issue(PARAVIRT_LAZY_CPU);
-}
+ for_each_online_cpu(cpu)
+ xen_pmu_finish(cpu);
-#ifdef CONFIG_X86_64
-static void xen_load_gs_index(unsigned int idx)
-{
- if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
+ if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
BUG();
}
-#endif
-static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
- const void *ptr)
+void xen_emergency_restart(void)
{
- xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
- u64 entry = *(u64 *)ptr;
-
- trace_xen_cpu_write_ldt_entry(dt, entrynum, entry);
-
- preempt_disable();
-
- xen_mc_flush();
- if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
- BUG();
-
- preempt_enable();
+ xen_reboot(SHUTDOWN_reboot);
}
-static int cvt_gate_to_trap(int vector, const gate_desc *val,
- struct trap_info *info)
+static int
+xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
- unsigned long addr;
-
- if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
- return 0;
-
- info->vector = vector;
-
- addr = gate_offset(*val);
-#ifdef CONFIG_X86_64
- /*
- * Look for known traps using IST, and substitute them
- * appropriately. The debugger ones are the only ones we care
- * about. Xen will handle faults like double_fault,
- * so we should never see them. Warn if
- * there's an unexpected IST-using fault handler.
- */
- if (addr == (unsigned long)debug)
- addr = (unsigned long)xen_debug;
- else if (addr == (unsigned long)int3)
- addr = (unsigned long)xen_int3;
- else if (addr == (unsigned long)stack_segment)
- addr = (unsigned long)xen_stack_segment;
- else if (addr == (unsigned long)double_fault) {
- /* Don't need to handle these */
- return 0;
-#ifdef CONFIG_X86_MCE
- } else if (addr == (unsigned long)machine_check) {
- /*
- * when xen hypervisor inject vMCE to guest,
- * use native mce handler to handle it
- */
- ;
-#endif
- } else if (addr == (unsigned long)nmi)
- /*
- * Use the native version as well.
- */
- ;
- else {
- /* Some other trap using IST? */
- if (WARN_ON(val->ist != 0))
- return 0;
- }
-#endif /* CONFIG_X86_64 */
- info->address = addr;
-
- info->cs = gate_segment(*val);
- info->flags = val->dpl;
- /* interrupt gates clear IF */
- if (val->type == GATE_INTERRUPT)
- info->flags |= 1 << 2;
-
- return 1;
+ if (!kexec_crash_loaded())
+ xen_reboot(SHUTDOWN_crash);
+ return NOTIFY_DONE;
}
-/* Locations of each CPU's IDT */
-static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
-
-/* Set an IDT entry. If the entry is part of the current IDT, then
- also update Xen. */
-static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
-{
- unsigned long p = (unsigned long)&dt[entrynum];
- unsigned long start, end;
-
- trace_xen_cpu_write_idt_entry(dt, entrynum, g);
-
- preempt_disable();
-
- start = __this_cpu_read(idt_desc.address);
- end = start + __this_cpu_read(idt_desc.size) + 1;
-
- xen_mc_flush();
-
- native_write_idt_entry(dt, entrynum, g);
-
- if (p >= start && (p + 8) <= end) {
- struct trap_info info[2];
-
- info[1].address = 0;
-
- if (cvt_gate_to_trap(entrynum, g, &info[0]))
- if (HYPERVISOR_set_trap_table(info))
- BUG();
- }
-
- preempt_enable();
-}
+static struct notifier_block xen_panic_block = {
+ .notifier_call = xen_panic_event,
+ .priority = INT_MIN
+};
-static void xen_convert_trap_info(const struct desc_ptr *desc,
- struct trap_info *traps)
+int xen_panic_handler_init(void)
{
- unsigned in, out, count;
-
- count = (desc->size+1) / sizeof(gate_desc);
- BUG_ON(count > 256);
-
- for (in = out = 0; in < count; in++) {
- gate_desc *entry = (gate_desc*)(desc->address) + in;
-
- if (cvt_gate_to_trap(in, entry, &traps[out]))
- out++;
- }
- traps[out].address = 0;
+ atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
+ return 0;
}
-void xen_copy_trap_info(struct trap_info *traps)
-{
- const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
-
- xen_convert_trap_info(desc, traps);
-}
-
-/* Load a new IDT into Xen. In principle this can be per-CPU, so we
- hold a spinlock to protect the static traps[] array (static because
- it avoids allocation, and saves stack space). */
-static void xen_load_idt(const struct desc_ptr *desc)
-{
- static DEFINE_SPINLOCK(lock);
- static struct trap_info traps[257];
-
- trace_xen_cpu_load_idt(desc);
-
- spin_lock(&lock);
-
- memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc));
-
- xen_convert_trap_info(desc, traps);
-
- xen_mc_flush();
- if (HYPERVISOR_set_trap_table(traps))
- BUG();
-
- spin_unlock(&lock);
-}
-
-/* Write a GDT descriptor entry. Ignore LDT descriptors, since
- they're handled differently. */
-static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
- const void *desc, int type)
-{
- trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
-
- preempt_disable();
-
- switch (type) {
- case DESC_LDT:
- case DESC_TSS:
- /* ignore */
- break;
-
- default: {
- xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
-
- xen_mc_flush();
- if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
- BUG();
- }
-
- }
-
- preempt_enable();
-}
-
-/*
- * Version of write_gdt_entry for use at early boot-time needed to
- * update an entry as simply as possible.
- */
-static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
- const void *desc, int type)
-{
- trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
-
- switch (type) {
- case DESC_LDT:
- case DESC_TSS:
- /* ignore */
- break;
-
- default: {
- xmaddr_t maddr = virt_to_machine(&dt[entry]);
-
- if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
- dt[entry] = *(struct desc_struct *)desc;
- }
-
- }
-}
-
-static void xen_load_sp0(struct tss_struct *tss,
- struct thread_struct *thread)
-{
- struct multicall_space mcs;
-
- mcs = xen_mc_entry(0);
- MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
- xen_mc_issue(PARAVIRT_LAZY_CPU);
- tss->x86_tss.sp0 = thread->sp0;
-}
-
-void xen_set_iopl_mask(unsigned mask)
-{
- struct physdev_set_iopl set_iopl;
-
- /* Force the change at ring 0. */
- set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
- HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
-}
-
-static void xen_io_delay(void)
-{
-}
-
-static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
-
-static unsigned long xen_read_cr0(void)
-{
- unsigned long cr0 = this_cpu_read(xen_cr0_value);
-
- if (unlikely(cr0 == 0)) {
- cr0 = native_read_cr0();
- this_cpu_write(xen_cr0_value, cr0);
- }
-
- return cr0;
-}
-
-static void xen_write_cr0(unsigned long cr0)
-{
- struct multicall_space mcs;
-
- this_cpu_write(xen_cr0_value, cr0);
-
- /* Only pay attention to cr0.TS; everything else is
- ignored. */
- mcs = xen_mc_entry(0);
-
- MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
-
- xen_mc_issue(PARAVIRT_LAZY_CPU);
-}
-
-static void xen_write_cr4(unsigned long cr4)
-{
- cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE);
-
- native_write_cr4(cr4);
-}
-#ifdef CONFIG_X86_64
-static inline unsigned long xen_read_cr8(void)
-{
- return 0;
-}
-static inline void xen_write_cr8(unsigned long val)
-{
- BUG_ON(val);
-}
-#endif
-
-static u64 xen_read_msr_safe(unsigned int msr, int *err)
-{
- u64 val;
-
- if (pmu_msr_read(msr, &val, err))
- return val;
-
- val = native_read_msr_safe(msr, err);
- switch (msr) {
- case MSR_IA32_APICBASE:
-#ifdef CONFIG_X86_X2APIC
- if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
-#endif
- val &= ~X2APIC_ENABLE;
- break;
- }
- return val;
-}
-
-static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
-{
- int ret;
-
- ret = 0;
-
- switch (msr) {
-#ifdef CONFIG_X86_64
- unsigned which;
- u64 base;
-
- case MSR_FS_BASE: which = SEGBASE_FS; goto set;
- case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set;
- case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set;
-
- set:
- base = ((u64)high << 32) | low;
- if (HYPERVISOR_set_segment_base(which, base) != 0)
- ret = -EIO;
- break;
-#endif
-
- case MSR_STAR:
- case MSR_CSTAR:
- case MSR_LSTAR:
- case MSR_SYSCALL_MASK:
- case MSR_IA32_SYSENTER_CS:
- case MSR_IA32_SYSENTER_ESP:
- case MSR_IA32_SYSENTER_EIP:
- /* Fast syscall setup is all done in hypercalls, so
- these are all ignored. Stub them out here to stop
- Xen console noise. */
- break;
-
- default:
- if (!pmu_msr_write(msr, low, high, &ret))
- ret = native_write_msr_safe(msr, low, high);
- }
-
- return ret;
-}
-
-static u64 xen_read_msr(unsigned int msr)
-{
- /*
- * This will silently swallow a #GP from RDMSR. It may be worth
- * changing that.
- */
- int err;
-
- return xen_read_msr_safe(msr, &err);
-}
-
-static void xen_write_msr(unsigned int msr, unsigned low, unsigned high)
-{
- /*
- * This will silently swallow a #GP from WRMSR. It may be worth
- * changing that.
- */
- xen_write_msr_safe(msr, low, high);
-}
-
-void xen_setup_shared_info(void)
-{
- if (!xen_feature(XENFEAT_auto_translated_physmap)) {
- set_fixmap(FIX_PARAVIRT_BOOTMAP,
- xen_start_info->shared_info);
-
- HYPERVISOR_shared_info =
- (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
- } else
- HYPERVISOR_shared_info =
- (struct shared_info *)__va(xen_start_info->shared_info);
-
-#ifndef CONFIG_SMP
- /* In UP this is as good a place as any to set up shared info */
- xen_setup_vcpu_info_placement();
-#endif
-
- xen_setup_mfn_list_list();
-}
-
-/* This is called once we have the cpu_possible_mask */
-void xen_setup_vcpu_info_placement(void)
-{
- int cpu;
-
- for_each_possible_cpu(cpu) {
- /* Set up direct vCPU id mapping for PV guests. */
- per_cpu(xen_vcpu_id, cpu) = cpu;
- xen_vcpu_setup(cpu);
- }
-
- /*
- * xen_vcpu_setup managed to place the vcpu_info within the
- * percpu area for all cpus, so make use of it.
- */
- if (xen_have_vcpu_info_placement) {
- pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
- pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
- pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
- pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct);
- pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
- }
-}
-
-static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
- unsigned long addr, unsigned len)
-{
- char *start, *end, *reloc;
- unsigned ret;
-
- start = end = reloc = NULL;
-
-#define SITE(op, x) \
- case PARAVIRT_PATCH(op.x): \
- if (xen_have_vcpu_info_placement) { \
- start = (char *)xen_##x##_direct; \
- end = xen_##x##_direct_end; \
- reloc = xen_##x##_direct_reloc; \
- } \
- goto patch_site
-
- switch (type) {
- SITE(pv_irq_ops, irq_enable);
- SITE(pv_irq_ops, irq_disable);
- SITE(pv_irq_ops, save_fl);
- SITE(pv_irq_ops, restore_fl);
-#undef SITE
-
- patch_site:
- if (start == NULL || (end-start) > len)
- goto default_patch;
-
- ret = paravirt_patch_insns(insnbuf, len, start, end);
-
- /* Note: because reloc is assigned from something that
- appears to be an array, gcc assumes it's non-null,
- but doesn't know its relationship with start and
- end. */
- if (reloc > start && reloc < end) {
- int reloc_off = reloc - start;
- long *relocp = (long *)(insnbuf + reloc_off);
- long delta = start - (char *)addr;
-
- *relocp += delta;
- }
- break;
-
- default_patch:
- default:
- ret = paravirt_patch_default(type, clobbers, insnbuf,
- addr, len);
- break;
- }
-
- return ret;
-}
-
-static const struct pv_info xen_info __initconst = {
- .shared_kernel_pmd = 0,
-
-#ifdef CONFIG_X86_64
- .extra_user_64bit_cs = FLAT_USER_CS64,
-#endif
- .name = "Xen",
-};
-
-static const struct pv_init_ops xen_init_ops __initconst = {
- .patch = xen_patch,
-};
-
-static const struct pv_cpu_ops xen_cpu_ops __initconst = {
- .cpuid = xen_cpuid,
-
- .set_debugreg = xen_set_debugreg,
- .get_debugreg = xen_get_debugreg,
-
- .read_cr0 = xen_read_cr0,
- .write_cr0 = xen_write_cr0,
-
- .read_cr4 = native_read_cr4,
- .write_cr4 = xen_write_cr4,
-
-#ifdef CONFIG_X86_64
- .read_cr8 = xen_read_cr8,
- .write_cr8 = xen_write_cr8,
-#endif
-
- .wbinvd = native_wbinvd,
-
- .read_msr = xen_read_msr,
- .write_msr = xen_write_msr,
-
- .read_msr_safe = xen_read_msr_safe,
- .write_msr_safe = xen_write_msr_safe,
-
- .read_pmc = xen_read_pmc,
-
- .iret = xen_iret,
-#ifdef CONFIG_X86_64
- .usergs_sysret64 = xen_sysret64,
-#endif
-
- .load_tr_desc = paravirt_nop,
- .set_ldt = xen_set_ldt,
- .load_gdt = xen_load_gdt,
- .load_idt = xen_load_idt,
- .load_tls = xen_load_tls,
-#ifdef CONFIG_X86_64
- .load_gs_index = xen_load_gs_index,
-#endif
-
- .alloc_ldt = xen_alloc_ldt,
- .free_ldt = xen_free_ldt,
-
- .store_idt = native_store_idt,
- .store_tr = xen_store_tr,
-
- .write_ldt_entry = xen_write_ldt_entry,
- .write_gdt_entry = xen_write_gdt_entry,
- .write_idt_entry = xen_write_idt_entry,
- .load_sp0 = xen_load_sp0,
-
- .set_iopl_mask = xen_set_iopl_mask,
- .io_delay = xen_io_delay,
-
- /* Xen takes care of %gs when switching to usermode for us */
- .swapgs = paravirt_nop,
-
- .start_context_switch = paravirt_start_context_switch,
- .end_context_switch = xen_end_context_switch,
-};
-
-void xen_reboot(int reason)
-{
- struct sched_shutdown r = { .reason = reason };
- int cpu;
-
- for_each_online_cpu(cpu)
- xen_pmu_finish(cpu);
-
- if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
- BUG();
-}
-
-static void xen_restart(char *msg)
-{
- xen_reboot(SHUTDOWN_reboot);
-}
-
-void xen_emergency_restart(void)
-{
- xen_reboot(SHUTDOWN_reboot);
-}
-
-static void xen_machine_halt(void)
-{
- xen_reboot(SHUTDOWN_poweroff);
-}
-
-static void xen_machine_power_off(void)
-{
- if (pm_power_off)
- pm_power_off();
- xen_reboot(SHUTDOWN_poweroff);
-}
-
-static void xen_crash_shutdown(struct pt_regs *regs)
-{
- xen_reboot(SHUTDOWN_crash);
-}
-
-static int
-xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
-{
- if (!kexec_crash_loaded())
- xen_reboot(SHUTDOWN_crash);
- return NOTIFY_DONE;
-}
-
-static struct notifier_block xen_panic_block = {
- .notifier_call= xen_panic_event,
- .priority = INT_MIN
-};
-
-int xen_panic_handler_init(void)
-{
- atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
- return 0;
-}
-
-static const struct machine_ops xen_machine_ops __initconst = {
- .restart = xen_restart,
- .halt = xen_machine_halt,
- .power_off = xen_machine_power_off,
- .shutdown = xen_machine_halt,
- .crash_shutdown = xen_crash_shutdown,
- .emergency_restart = xen_emergency_restart,
-};
-
-static unsigned char xen_get_nmi_reason(void)
-{
- unsigned char reason = 0;
-
- /* Construct a value which looks like it came from port 0x61. */
- if (test_bit(_XEN_NMIREASON_io_error,
- &HYPERVISOR_shared_info->arch.nmi_reason))
- reason |= NMI_REASON_IOCHK;
- if (test_bit(_XEN_NMIREASON_pci_serr,
- &HYPERVISOR_shared_info->arch.nmi_reason))
- reason |= NMI_REASON_SERR;
-
- return reason;
-}
-
-static void __init xen_boot_params_init_edd(void)
-{
-#if IS_ENABLED(CONFIG_EDD)
- struct xen_platform_op op;
- struct edd_info *edd_info;
- u32 *mbr_signature;
- unsigned nr;
- int ret;
-
- edd_info = boot_params.eddbuf;
- mbr_signature = boot_params.edd_mbr_sig_buffer;
-
- op.cmd = XENPF_firmware_info;
-
- op.u.firmware_info.type = XEN_FW_DISK_INFO;
- for (nr = 0; nr < EDDMAXNR; nr++) {
- struct edd_info *info = edd_info + nr;
-
- op.u.firmware_info.index = nr;
- info->params.length = sizeof(info->params);
- set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params,
- &info->params);
- ret = HYPERVISOR_platform_op(&op);
- if (ret)
- break;
-
-#define C(x) info->x = op.u.firmware_info.u.disk_info.x
- C(device);
- C(version);
- C(interface_support);
- C(legacy_max_cylinder);
- C(legacy_max_head);
- C(legacy_sectors_per_track);
-#undef C
- }
- boot_params.eddbuf_entries = nr;
-
- op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE;
- for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) {
- op.u.firmware_info.index = nr;
- ret = HYPERVISOR_platform_op(&op);
- if (ret)
- break;
- mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature;
- }
- boot_params.edd_mbr_sig_buf_entries = nr;
-#endif
-}
-
-/*
- * Set up the GDT and segment registers for -fstack-protector. Until
- * we do this, we have to be careful not to call any stack-protected
- * function, which is most of the kernel.
- */
-static void xen_setup_gdt(int cpu)
-{
- pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
- pv_cpu_ops.load_gdt = xen_load_gdt_boot;
-
- setup_stack_canary_segment(0);
- switch_to_new_gdt(0);
-
- pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry;
- pv_cpu_ops.load_gdt = xen_load_gdt;
-}
-
-static void __init xen_dom0_set_legacy_features(void)
-{
- x86_platform.legacy.rtc = 1;
-}
-
-int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
- int (*cpu_dead_cb)(unsigned int))
-{
- int rc;
-
- rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
- "x86/xen/hvm_guest:prepare",
- cpu_up_prepare_cb, cpu_dead_cb);
- if (rc >= 0) {
- rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
- "x86/xen/hvm_guest:online",
- xen_cpu_up_online, NULL);
- if (rc < 0)
- cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);
- }
-
- return rc >= 0 ? 0 : rc;
-}
-
-/* First C function to be called on Xen boot */
-asmlinkage __visible void __init xen_start_kernel(void)
-{
- struct physdev_set_iopl set_iopl;
- unsigned long initrd_start = 0;
- int rc;
-
- if (!xen_start_info)
- return;
-
- xen_domain_type = XEN_PV_DOMAIN;
-
- xen_setup_features();
-
- xen_setup_machphys_mapping();
-
- /* Install Xen paravirt ops */
- pv_info = xen_info;
- pv_init_ops = xen_init_ops;
- pv_cpu_ops = xen_cpu_ops;
-
- x86_platform.get_nmi_reason = xen_get_nmi_reason;
-
- x86_init.resources.memory_setup = xen_memory_setup;
- x86_init.oem.arch_setup = xen_arch_setup;
- x86_init.oem.banner = xen_banner;
-
- xen_init_time_ops();
-
- /*
- * Set up some pagetable state before starting to set any ptes.
- */
-
- xen_init_mmu_ops();
-
- /* Prevent unwanted bits from being set in PTEs. */
- __supported_pte_mask &= ~_PAGE_GLOBAL;
-
- /*
- * Prevent page tables from being allocated in highmem, even
- * if CONFIG_HIGHPTE is enabled.
- */
- __userpte_alloc_gfp &= ~__GFP_HIGHMEM;
-
- /* Work out if we support NX */
- x86_configure_nx();
-
- /* Get mfn list */
- xen_build_dynamic_phys_to_machine();
-
- /*
- * Set up kernel GDT and segment registers, mainly so that
- * -fstack-protector code can be executed.
- */
- xen_setup_gdt(0);
-
- xen_init_irq_ops();
- xen_init_cpuid_mask();
-
-#ifdef CONFIG_X86_LOCAL_APIC
- /*
- * set up the basic apic ops.
- */
- xen_init_apic();
-#endif
-
- if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
- pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
- pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
- }
-
- machine_ops = xen_machine_ops;
-
- /*
- * The only reliable way to retain the initial address of the
- * percpu gdt_page is to remember it here, so we can go and
- * mark it RW later, when the initial percpu area is freed.
- */
- xen_initial_gdt = &per_cpu(gdt_page, 0);
-
- xen_smp_init();
-
-#ifdef CONFIG_ACPI_NUMA
- /*
- * The pages we from Xen are not related to machine pages, so
- * any NUMA information the kernel tries to get from ACPI will
- * be meaningless. Prevent it from trying.
- */
- acpi_numa = -1;
-#endif
- /* Don't do the full vcpu_info placement stuff until we have a
- possible map and a non-dummy shared_info. */
- per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
-
- WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_pv, xen_cpu_dead_pv));
-
- local_irq_disable();
- early_boot_irqs_disabled = true;
-
- xen_raw_console_write("mapping kernel into physical memory\n");
- xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base,
- xen_start_info->nr_pages);
- xen_reserve_special_pages();
-
- /* keep using Xen gdt for now; no urgent need to change it */
-
-#ifdef CONFIG_X86_32
- pv_info.kernel_rpl = 1;
- if (xen_feature(XENFEAT_supervisor_mode_kernel))
- pv_info.kernel_rpl = 0;
-#else
- pv_info.kernel_rpl = 0;
-#endif
- /* set the limit of our address space */
- xen_reserve_top();
-
- /*
- * We used to do this in xen_arch_setup, but that is too late
- * on AMD were early_cpu_init (run before ->arch_setup()) calls
- * early_amd_init which pokes 0xcf8 port.
- */
- set_iopl.iopl = 1;
- rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
- if (rc != 0)
- xen_raw_printk("physdev_op failed %d\n", rc);
-
-#ifdef CONFIG_X86_32
- /* set up basic CPUID stuff */
- cpu_detect(&new_cpu_data);
- set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU);
- new_cpu_data.wp_works_ok = 1;
- new_cpu_data.x86_capability[CPUID_1_EDX] = cpuid_edx(1);
-#endif
-
- if (xen_start_info->mod_start) {
- if (xen_start_info->flags & SIF_MOD_START_PFN)
- initrd_start = PFN_PHYS(xen_start_info->mod_start);
- else
- initrd_start = __pa(xen_start_info->mod_start);
- }
-
- /* Poke various useful things into boot_params */
- boot_params.hdr.type_of_loader = (9 << 4) | 0;
- boot_params.hdr.ramdisk_image = initrd_start;
- boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
- boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
- boot_params.hdr.hardware_subarch = X86_SUBARCH_XEN;
-
- if (!xen_initial_domain()) {
- add_preferred_console("xenboot", 0, NULL);
- add_preferred_console("tty", 0, NULL);
- add_preferred_console("hvc", 0, NULL);
- if (pci_xen)
- x86_init.pci.arch_init = pci_xen_init;
- } else {
- const struct dom0_vga_console_info *info =
- (void *)((char *)xen_start_info +
- xen_start_info->console.dom0.info_off);
- struct xen_platform_op op = {
- .cmd = XENPF_firmware_info,
- .interface_version = XENPF_INTERFACE_VERSION,
- .u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS,
- };
-
- x86_platform.set_legacy_features =
- xen_dom0_set_legacy_features;
- xen_init_vga(info, xen_start_info->console.dom0.info_size);
- xen_start_info->console.domU.mfn = 0;
- xen_start_info->console.domU.evtchn = 0;
-
- if (HYPERVISOR_platform_op(&op) == 0)
- boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags;
-
- /* Make sure ACS will be enabled */
- pci_request_acs();
-
- xen_acpi_sleep_register();
-
- /* Avoid searching for BIOS MP tables */
- x86_init.mpparse.find_smp_config = x86_init_noop;
- x86_init.mpparse.get_smp_config = x86_init_uint_noop;
-
- xen_boot_params_init_edd();
- }
-#ifdef CONFIG_PCI
- /* PCI BIOS service won't work from a PV guest. */
- pci_probe &= ~PCI_PROBE_BIOS;
-#endif
- xen_raw_console_write("about to get started...\n");
-
- /* Let's presume PV guests always boot on vCPU with id 0. */
- per_cpu(xen_vcpu_id, 0) = 0;
-
- xen_setup_runstate_info(0);
-
- xen_efi_init();
-
- /* Start the world */
-#ifdef CONFIG_X86_32
- i386_start_kernel();
-#else
- cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
- x86_64_start_reservations((char *)__pa_symbol(&boot_params));
-#endif
-}
-
-static int xen_cpu_up_prepare_pv(unsigned int cpu)
-{
- int rc;
-
- xen_setup_timer(cpu);
-
- rc = xen_smp_intr_init(cpu);
- if (rc) {
- WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
- cpu, rc);
- return rc;
- }
- return 0;
-}
-
-static int xen_cpu_dead_pv(unsigned int cpu)
-{
- xen_smp_intr_free(cpu);
-
- xen_teardown_timer(cpu);
-
- return 0;
-}
-
-static int xen_cpu_up_online(unsigned int cpu)
-{
- xen_init_lock_cpu(cpu);
- return 0;
-}
-
-static uint32_t __init xen_platform_pv(void)
-{
- if (xen_pv_domain())
- return xen_cpuid_base();
-
- return 0;
-}
-
-static void xen_set_cpu_features(struct cpuinfo_x86 *c)
-{
- clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
- set_cpu_cap(c, X86_FEATURE_XENPV);
-}
-
-static void xen_pin_vcpu(int cpu)
-{
- static bool disable_pinning;
- struct sched_pin_override pin_override;
- int ret;
-
- if (disable_pinning)
- return;
-
- pin_override.pcpu = cpu;
- ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
-
- /* Ignore errors when removing override. */
- if (cpu < 0)
- return;
-
- switch (ret) {
- case -ENOSYS:
- pr_warn("Unable to pin on physical cpu %d. In case of problems consider vcpu pinning.\n",
- cpu);
- disable_pinning = true;
- break;
- case -EPERM:
- WARN(1, "Trying to pin vcpu without having privilege to do so\n");
- disable_pinning = true;
- break;
- case -EINVAL:
- case -EBUSY:
- pr_warn("Physical cpu %d not available for pinning. Check Xen cpu configuration.\n",
- cpu);
- break;
- case 0:
- break;
- default:
- WARN(1, "rc %d while trying to pin vcpu\n", ret);
- disable_pinning = true;
- }
-}
-
-const struct hypervisor_x86 x86_hyper_xen_pv = {
- .name = "Xen PV",
- .detect = xen_platform_pv,
- .set_cpu_features = xen_set_cpu_features,
- .pin_vcpu = xen_pin_vcpu,
-};
-EXPORT_SYMBOL(x86_hyper_xen_pv);
-
#ifdef CONFIG_HOTPLUG_CPU
void xen_arch_register_cpu(int num)
{
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
new file mode 100644
index 0000000..b9ff23c
--- /dev/null
+++ b/arch/x86/xen/enlighten_pv.c
@@ -0,0 +1,1552 @@
+/*
+ * Core of Xen paravirt_ops implementation.
+ *
+ * This file contains the xen_paravirt_ops structure itself, and the
+ * implementations for:
+ * - privileged instructions
+ * - interrupt flags
+ * - segment operations
+ * - booting and setup
+ *
+ * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
+ */
+
+#include <linux/cpu.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/preempt.h>
+#include <linux/hardirq.h>
+#include <linux/percpu.h>
+#include <linux/delay.h>
+#include <linux/start_kernel.h>
+#include <linux/sched.h>
+#include <linux/kprobes.h>
+#include <linux/bootmem.h>
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/page-flags.h>
+#include <linux/highmem.h>
+#include <linux/console.h>
+#include <linux/pci.h>
+#include <linux/gfp.h>
+#include <linux/memblock.h>
+#include <linux/edd.h>
+#include <linux/frame.h>
+
+#include <xen/xen.h>
+#include <xen/events.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/version.h>
+#include <xen/interface/physdev.h>
+#include <xen/interface/vcpu.h>
+#include <xen/interface/memory.h>
+#include <xen/interface/nmi.h>
+#include <xen/interface/xen-mca.h>
+#include <xen/features.h>
+#include <xen/page.h>
+#include <xen/hvc-console.h>
+#include <xen/acpi.h>
+
+#include <asm/paravirt.h>
+#include <asm/apic.h>
+#include <asm/page.h>
+#include <asm/xen/pci.h>
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/cpuid.h>
+#include <asm/fixmap.h>
+#include <asm/processor.h>
+#include <asm/proto.h>
+#include <asm/msr-index.h>
+#include <asm/traps.h>
+#include <asm/setup.h>
+#include <asm/desc.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/reboot.h>
+#include <asm/stackprotector.h>
+#include <asm/hypervisor.h>
+#include <asm/mach_traps.h>
+#include <asm/mwait.h>
+#include <asm/pci_x86.h>
+#include <asm/cpu.h>
+
+#ifdef CONFIG_ACPI
+#include <linux/acpi.h>
+#include <asm/acpi.h>
+#include <acpi/pdc_intel.h>
+#include <acpi/processor.h>
+#include <xen/interface/platform.h>
+#endif
+
+#include "xen-ops.h"
+#include "mmu.h"
+#include "smp.h"
+#include "multicalls.h"
+#include "pmu.h"
+
+void *xen_initial_gdt;
+
+RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
+
+static int xen_cpu_up_prepare_pv(unsigned int cpu);
+static int xen_cpu_dead_pv(unsigned int cpu);
+
+struct tls_descs {
+ struct desc_struct desc[3];
+};
+
+/*
+ * Updating the 3 TLS descriptors in the GDT on every task switch is
+ * surprisingly expensive so we avoid updating them if they haven't
+ * changed. Since Xen writes different descriptors than the one
+ * passed in the update_descriptor hypercall we keep shadow copies to
+ * compare against.
+ */
+static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
+
+/*
+ * On restore, set the vcpu placement up again.
+ * If it fails, then we're in a bad state, since
+ * we can't back out from using it...
+ */
+void xen_vcpu_restore(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ bool other_cpu = (cpu != smp_processor_id());
+ bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu),
+ NULL);
+
+ if (other_cpu && is_up &&
+ HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
+ BUG();
+
+ xen_setup_runstate_info(cpu);
+
+ if (xen_have_vcpu_info_placement)
+ xen_vcpu_setup(cpu);
+
+ if (other_cpu && is_up &&
+ HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
+ BUG();
+ }
+}
+
+static void __init xen_banner(void)
+{
+ unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
+ struct xen_extraversion extra;
+ HYPERVISOR_xen_version(XENVER_extraversion, &extra);
+
+ pr_info("Booting paravirtualized kernel %son %s\n",
+ xen_feature(XENFEAT_auto_translated_physmap) ?
+ "with PVH extensions " : "", pv_info.name);
+ printk(KERN_INFO "Xen version: %d.%d%s%s\n",
+ version >> 16, version & 0xffff, extra.extraversion,
+ xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
+}
+/* Check if running on Xen version (major, minor) or later */
+bool
+xen_running_on_version_or_later(unsigned int major, unsigned int minor)
+{
+ unsigned int version;
+
+ if (!xen_domain())
+ return false;
+
+ version = HYPERVISOR_xen_version(XENVER_version, NULL);
+ if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
+ ((version >> 16) > major))
+ return true;
+ return false;
+}
+
+#define CPUID_THERM_POWER_LEAF 6
+#define APERFMPERF_PRESENT 0
+
+static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0;
+static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0;
+
+static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask;
+static __read_mostly unsigned int cpuid_leaf5_ecx_val;
+static __read_mostly unsigned int cpuid_leaf5_edx_val;
+
+static void xen_cpuid(unsigned int *ax, unsigned int *bx,
+ unsigned int *cx, unsigned int *dx)
+{
+ unsigned maskebx = ~0;
+ unsigned maskecx = ~0;
+ unsigned maskedx = ~0;
+ unsigned setecx = 0;
+ /*
+ * Mask out inconvenient features, to try and disable as many
+ * unsupported kernel subsystems as possible.
+ */
+ switch (*ax) {
+ case 1:
+ maskecx = cpuid_leaf1_ecx_mask;
+ setecx = cpuid_leaf1_ecx_set_mask;
+ maskedx = cpuid_leaf1_edx_mask;
+ break;
+
+ case CPUID_MWAIT_LEAF:
+ /* Synthesize the values.. */
+ *ax = 0;
+ *bx = 0;
+ *cx = cpuid_leaf5_ecx_val;
+ *dx = cpuid_leaf5_edx_val;
+ return;
+
+ case CPUID_THERM_POWER_LEAF:
+ /* Disabling APERFMPERF for kernel usage */
+ maskecx = ~(1 << APERFMPERF_PRESENT);
+ break;
+
+ case 0xb:
+ /* Suppress extended topology stuff */
+ maskebx = 0;
+ break;
+ }
+
+ asm(XEN_EMULATE_PREFIX "cpuid"
+ : "=a" (*ax),
+ "=b" (*bx),
+ "=c" (*cx),
+ "=d" (*dx)
+ : "0" (*ax), "2" (*cx));
+
+ *bx &= maskebx;
+ *cx &= maskecx;
+ *cx |= setecx;
+ *dx &= maskedx;
+}
+STACK_FRAME_NON_STANDARD(xen_cpuid); /* XEN_EMULATE_PREFIX */
+
+static bool __init xen_check_mwait(void)
+{
+#ifdef CONFIG_ACPI
+ struct xen_platform_op op = {
+ .cmd = XENPF_set_processor_pminfo,
+ .u.set_pminfo.id = -1,
+ .u.set_pminfo.type = XEN_PM_PDC,
+ };
+ uint32_t buf[3];
+ unsigned int ax, bx, cx, dx;
+ unsigned int mwait_mask;
+
+ /* We need to determine whether it is OK to expose the MWAIT
+ * capability to the kernel to harvest deeper than C3 states from ACPI
+ * _CST using the processor_harvest_xen.c module. For this to work, we
+ * need to gather the MWAIT_LEAF values (which the cstate.c code
+ * checks against). The hypervisor won't expose the MWAIT flag because
+ * it would break backwards compatibility; so we will find out directly
+ * from the hardware and hypercall.
+ */
+ if (!xen_initial_domain())
+ return false;
+
+ /*
+ * When running under platform earlier than Xen4.2, do not expose
+ * mwait, to avoid the risk of loading native acpi pad driver
+ */
+ if (!xen_running_on_version_or_later(4, 2))
+ return false;
+
+ ax = 1;
+ cx = 0;
+
+ native_cpuid(&ax, &bx, &cx, &dx);
+
+ mwait_mask = (1 << (X86_FEATURE_EST % 32)) |
+ (1 << (X86_FEATURE_MWAIT % 32));
+
+ if ((cx & mwait_mask) != mwait_mask)
+ return false;
+
+ /* We need to emulate the MWAIT_LEAF and for that we need both
+ * ecx and edx. The hypercall provides only partial information.
+ */
+
+ ax = CPUID_MWAIT_LEAF;
+ bx = 0;
+ cx = 0;
+ dx = 0;
+
+ native_cpuid(&ax, &bx, &cx, &dx);
+
+ /* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so,
+ * don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3.
+ */
+ buf[0] = ACPI_PDC_REVISION_ID;
+ buf[1] = 1;
+ buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP);
+
+ set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
+
+ if ((HYPERVISOR_platform_op(&op) == 0) &&
+ (buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) {
+ cpuid_leaf5_ecx_val = cx;
+ cpuid_leaf5_edx_val = dx;
+ }
+ return true;
+#else
+ return false;
+#endif
+}
+static void __init xen_init_cpuid_mask(void)
+{
+ unsigned int ax, bx, cx, dx;
+ unsigned int xsave_mask;
+
+ cpuid_leaf1_edx_mask =
+ ~((1 << X86_FEATURE_MTRR) | /* disable MTRR */
+ (1 << X86_FEATURE_ACC)); /* thermal monitoring */
+
+ if (!xen_initial_domain())
+ cpuid_leaf1_edx_mask &=
+ ~((1 << X86_FEATURE_ACPI)); /* disable ACPI */
+
+ cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
+
+ ax = 1;
+ cx = 0;
+ cpuid(1, &ax, &bx, &cx, &dx);
+
+ xsave_mask =
+ (1 << (X86_FEATURE_XSAVE % 32)) |
+ (1 << (X86_FEATURE_OSXSAVE % 32));
+
+ /* Xen will set CR4.OSXSAVE if supported and not disabled by force */
+ if ((cx & xsave_mask) != xsave_mask)
+ cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */
+ if (xen_check_mwait())
+ cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32));
+}
+
+static void xen_set_debugreg(int reg, unsigned long val)
+{
+ HYPERVISOR_set_debugreg(reg, val);
+}
+
+static unsigned long xen_get_debugreg(int reg)
+{
+ return HYPERVISOR_get_debugreg(reg);
+}
+
+static void xen_end_context_switch(struct task_struct *next)
+{
+ xen_mc_flush();
+ paravirt_end_context_switch(next);
+}
+
+static unsigned long xen_store_tr(void)
+{
+ return 0;
+}
+
+/*
+ * Set the page permissions for a particular virtual address. If the
+ * address is a vmalloc mapping (or other non-linear mapping), then
+ * find the linear mapping of the page and also set its protections to
+ * match.
+ */
+static void set_aliased_prot(void *v, pgprot_t prot)
+{
+ int level;
+ pte_t *ptep;
+ pte_t pte;
+ unsigned long pfn;
+ struct page *page;
+ unsigned char dummy;
+
+ ptep = lookup_address((unsigned long)v, &level);
+ BUG_ON(ptep == NULL);
+
+ pfn = pte_pfn(*ptep);
+ page = pfn_to_page(pfn);
+
+ pte = pfn_pte(pfn, prot);
+
+ /*
+ * Careful: update_va_mapping() will fail if the virtual address
+ * we're poking isn't populated in the page tables. We don't
+ * need to worry about the direct map (that's always in the page
+ * tables), but we need to be careful about vmap space. In
+ * particular, the top level page table can lazily propagate
+ * entries between processes, so if we've switched mms since we
+ * vmapped the target in the first place, we might not have the
+ * top-level page table entry populated.
+ *
+ * We disable preemption because we want the same mm active when
+ * we probe the target and when we issue the hypercall. We'll
+ * have the same nominal mm, but if we're a kernel thread, lazy
+ * mm dropping could change our pgd.
+ *
+ * Out of an abundance of caution, this uses __get_user() to fault
+ * in the target address just in case there's some obscure case
+ * in which the target address isn't readable.
+ */
+
+ preempt_disable();
+
+ probe_kernel_read(&dummy, v, 1);
+
+ if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
+ BUG();
+
+ if (!PageHighMem(page)) {
+ void *av = __va(PFN_PHYS(pfn));
+
+ if (av != v)
+ if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
+ BUG();
+ } else
+ kmap_flush_unused();
+
+ preempt_enable();
+}
+
+static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
+{
+ const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
+ int i;
+
+ /*
+ * We need to mark the all aliases of the LDT pages RO. We
+ * don't need to call vm_flush_aliases(), though, since that's
+ * only responsible for flushing aliases out the TLBs, not the
+ * page tables, and Xen will flush the TLB for us if needed.
+ *
+ * To avoid confusing future readers: none of this is necessary
+ * to load the LDT. The hypervisor only checks this when the
+ * LDT is faulted in due to subsequent descriptor access.
+ */
+
+ for (i = 0; i < entries; i += entries_per_page)
+ set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
+}
+
+static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
+{
+ const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
+ int i;
+
+ for (i = 0; i < entries; i += entries_per_page)
+ set_aliased_prot(ldt + i, PAGE_KERNEL);
+}
+
+static void xen_set_ldt(const void *addr, unsigned entries)
+{
+ struct mmuext_op *op;
+ struct multicall_space mcs = xen_mc_entry(sizeof(*op));
+
+ trace_xen_cpu_set_ldt(addr, entries);
+
+ op = mcs.args;
+ op->cmd = MMUEXT_SET_LDT;
+ op->arg1.linear_addr = (unsigned long)addr;
+ op->arg2.nr_ents = entries;
+
+ MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+
+ xen_mc_issue(PARAVIRT_LAZY_CPU);
+}
+
+static void xen_load_gdt(const struct desc_ptr *dtr)
+{
+ unsigned long va = dtr->address;
+ unsigned int size = dtr->size + 1;
+ unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
+ unsigned long frames[pages];
+ int f;
+
+ /*
+ * A GDT can be up to 64k in size, which corresponds to 8192
+ * 8-byte entries, or 16 4k pages..
+ */
+
+ BUG_ON(size > 65536);
+ BUG_ON(va & ~PAGE_MASK);
+
+ for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
+ int level;
+ pte_t *ptep;
+ unsigned long pfn, mfn;
+ void *virt;
+
+ /*
+ * The GDT is per-cpu and is in the percpu data area.
+ * That can be virtually mapped, so we need to do a
+ * page-walk to get the underlying MFN for the
+ * hypercall. The page can also be in the kernel's
+ * linear range, so we need to RO that mapping too.
+ */
+ ptep = lookup_address(va, &level);
+ BUG_ON(ptep == NULL);
+
+ pfn = pte_pfn(*ptep);
+ mfn = pfn_to_mfn(pfn);
+ virt = __va(PFN_PHYS(pfn));
+
+ frames[f] = mfn;
+
+ make_lowmem_page_readonly((void *)va);
+ make_lowmem_page_readonly(virt);
+ }
+
+ if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
+ BUG();
+}
+
+/*
+ * load_gdt for early boot, when the gdt is only mapped once
+ */
+static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
+{
+ unsigned long va = dtr->address;
+ unsigned int size = dtr->size + 1;
+ unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
+ unsigned long frames[pages];
+ int f;
+
+ /*
+ * A GDT can be up to 64k in size, which corresponds to 8192
+ * 8-byte entries, or 16 4k pages..
+ */
+
+ BUG_ON(size > 65536);
+ BUG_ON(va & ~PAGE_MASK);
+
+ for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
+ pte_t pte;
+ unsigned long pfn, mfn;
+
+ pfn = virt_to_pfn(va);
+ mfn = pfn_to_mfn(pfn);
+
+ pte = pfn_pte(pfn, PAGE_KERNEL_RO);
+
+ if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0))
+ BUG();
+
+ frames[f] = mfn;
+ }
+
+ if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
+ BUG();
+}
+
+static inline bool desc_equal(const struct desc_struct *d1,
+ const struct desc_struct *d2)
+{
+ return d1->a == d2->a && d1->b == d2->b;
+}
+
+static void load_TLS_descriptor(struct thread_struct *t,
+ unsigned int cpu, unsigned int i)
+{
+ struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i];
+ struct desc_struct *gdt;
+ xmaddr_t maddr;
+ struct multicall_space mc;
+
+ if (desc_equal(shadow, &t->tls_array[i]))
+ return;
+
+ *shadow = t->tls_array[i];
+
+ gdt = get_cpu_gdt_table(cpu);
+ maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
+ mc = __xen_mc_entry(0);
+
+ MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
+}
+
+static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
+{
+ /*
+ * XXX sleazy hack: If we're being called in a lazy-cpu zone
+ * and lazy gs handling is enabled, it means we're in a
+ * context switch, and %gs has just been saved. This means we
+ * can zero it out to prevent faults on exit from the
+ * hypervisor if the next process has no %gs. Either way, it
+ * has been saved, and the new value will get loaded properly.
+ * This will go away as soon as Xen has been modified to not
+ * save/restore %gs for normal hypercalls.
+ *
+ * On x86_64, this hack is not used for %gs, because gs points
+ * to KERNEL_GS_BASE (and uses it for PDA references), so we
+ * must not zero %gs on x86_64
+ *
+ * For x86_64, we need to zero %fs, otherwise we may get an
+ * exception between the new %fs descriptor being loaded and
+ * %fs being effectively cleared at __switch_to().
+ */
+ if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
+#ifdef CONFIG_X86_32
+ lazy_load_gs(0);
+#else
+ loadsegment(fs, 0);
+#endif
+ }
+
+ xen_mc_batch();
+
+ load_TLS_descriptor(t, cpu, 0);
+ load_TLS_descriptor(t, cpu, 1);
+ load_TLS_descriptor(t, cpu, 2);
+
+ xen_mc_issue(PARAVIRT_LAZY_CPU);
+}
+
+#ifdef CONFIG_X86_64
+static void xen_load_gs_index(unsigned int idx)
+{
+ if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
+ BUG();
+}
+#endif
+
+static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
+ const void *ptr)
+{
+ xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
+ u64 entry = *(u64 *)ptr;
+
+ trace_xen_cpu_write_ldt_entry(dt, entrynum, entry);
+
+ preempt_disable();
+
+ xen_mc_flush();
+ if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
+ BUG();
+
+ preempt_enable();
+}
+
+static int cvt_gate_to_trap(int vector, const gate_desc *val,
+ struct trap_info *info)
+{
+ unsigned long addr;
+
+ if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
+ return 0;
+
+ info->vector = vector;
+
+ addr = gate_offset(*val);
+#ifdef CONFIG_X86_64
+ /*
+ * Look for known traps using IST, and substitute them
+ * appropriately. The debugger ones are the only ones we care
+ * about. Xen will handle faults like double_fault,
+ * so we should never see them. Warn if
+ * there's an unexpected IST-using fault handler.
+ */
+ if (addr == (unsigned long)debug)
+ addr = (unsigned long)xen_debug;
+ else if (addr == (unsigned long)int3)
+ addr = (unsigned long)xen_int3;
+ else if (addr == (unsigned long)stack_segment)
+ addr = (unsigned long)xen_stack_segment;
+ else if (addr == (unsigned long)double_fault) {
+ /* Don't need to handle these */
+ return 0;
+#ifdef CONFIG_X86_MCE
+ } else if (addr == (unsigned long)machine_check) {
+ /*
+ * when xen hypervisor inject vMCE to guest,
+ * use native mce handler to handle it
+ */
+ ;
+#endif
+ } else if (addr == (unsigned long)nmi)
+ /*
+ * Use the native version as well.
+ */
+ ;
+ else {
+ /* Some other trap using IST? */
+ if (WARN_ON(val->ist != 0))
+ return 0;
+ }
+#endif /* CONFIG_X86_64 */
+ info->address = addr;
+
+ info->cs = gate_segment(*val);
+ info->flags = val->dpl;
+ /* interrupt gates clear IF */
+ if (val->type == GATE_INTERRUPT)
+ info->flags |= 1 << 2;
+
+ return 1;
+}
+
+/* Locations of each CPU's IDT */
+static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
+
+/* Set an IDT entry. If the entry is part of the current IDT, then
+ also update Xen. */
+static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
+{
+ unsigned long p = (unsigned long)&dt[entrynum];
+ unsigned long start, end;
+
+ trace_xen_cpu_write_idt_entry(dt, entrynum, g);
+
+ preempt_disable();
+
+ start = __this_cpu_read(idt_desc.address);
+ end = start + __this_cpu_read(idt_desc.size) + 1;
+
+ xen_mc_flush();
+
+ native_write_idt_entry(dt, entrynum, g);
+
+ if (p >= start && (p + 8) <= end) {
+ struct trap_info info[2];
+
+ info[1].address = 0;
+
+ if (cvt_gate_to_trap(entrynum, g, &info[0]))
+ if (HYPERVISOR_set_trap_table(info))
+ BUG();
+ }
+
+ preempt_enable();
+}
+
+static void xen_convert_trap_info(const struct desc_ptr *desc,
+ struct trap_info *traps)
+{
+ unsigned in, out, count;
+
+ count = (desc->size+1) / sizeof(gate_desc);
+ BUG_ON(count > 256);
+
+ for (in = out = 0; in < count; in++) {
+ gate_desc *entry = (gate_desc *)(desc->address) + in;
+
+ if (cvt_gate_to_trap(in, entry, &traps[out]))
+ out++;
+ }
+ traps[out].address = 0;
+}
+
+void xen_copy_trap_info(struct trap_info *traps)
+{
+ const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
+
+ xen_convert_trap_info(desc, traps);
+}
+
+/* Load a new IDT into Xen. In principle this can be per-CPU, so we
+ hold a spinlock to protect the static traps[] array (static because
+ it avoids allocation, and saves stack space). */
+static void xen_load_idt(const struct desc_ptr *desc)
+{
+ static DEFINE_SPINLOCK(lock);
+ static struct trap_info traps[257];
+
+ trace_xen_cpu_load_idt(desc);
+
+ spin_lock(&lock);
+
+ memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc));
+
+ xen_convert_trap_info(desc, traps);
+
+ xen_mc_flush();
+ if (HYPERVISOR_set_trap_table(traps))
+ BUG();
+
+ spin_unlock(&lock);
+}
+
+/* Write a GDT descriptor entry. Ignore LDT descriptors, since
+ they're handled differently. */
+static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
+ const void *desc, int type)
+{
+ trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
+
+ preempt_disable();
+
+ switch (type) {
+ case DESC_LDT:
+ case DESC_TSS:
+ /* ignore */
+ break;
+
+ default: {
+ xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
+
+ xen_mc_flush();
+ if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
+ BUG();
+ }
+
+ }
+
+ preempt_enable();
+}
+
+/*
+ * Version of write_gdt_entry for use at early boot-time needed to
+ * update an entry as simply as possible.
+ */
+static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
+ const void *desc, int type)
+{
+ trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
+
+ switch (type) {
+ case DESC_LDT:
+ case DESC_TSS:
+ /* ignore */
+ break;
+
+ default: {
+ xmaddr_t maddr = virt_to_machine(&dt[entry]);
+
+ if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
+ dt[entry] = *(struct desc_struct *)desc;
+ }
+
+ }
+}
+
+static void xen_load_sp0(struct tss_struct *tss,
+ struct thread_struct *thread)
+{
+ struct multicall_space mcs;
+
+ mcs = xen_mc_entry(0);
+ MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
+ xen_mc_issue(PARAVIRT_LAZY_CPU);
+ tss->x86_tss.sp0 = thread->sp0;
+}
+
+void xen_set_iopl_mask(unsigned mask)
+{
+ struct physdev_set_iopl set_iopl;
+
+ /* Force the change at ring 0. */
+ set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
+ HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
+}
+
+static void xen_io_delay(void)
+{
+}
+
+static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
+
+static unsigned long xen_read_cr0(void)
+{
+ unsigned long cr0 = this_cpu_read(xen_cr0_value);
+
+ if (unlikely(cr0 == 0)) {
+ cr0 = native_read_cr0();
+ this_cpu_write(xen_cr0_value, cr0);
+ }
+
+ return cr0;
+}
+
+static void xen_write_cr0(unsigned long cr0)
+{
+ struct multicall_space mcs;
+
+ this_cpu_write(xen_cr0_value, cr0);
+
+ /* Only pay attention to cr0.TS; everything else is
+ ignored. */
+ mcs = xen_mc_entry(0);
+
+ MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
+
+ xen_mc_issue(PARAVIRT_LAZY_CPU);
+}
+
+static void xen_write_cr4(unsigned long cr4)
+{
+ cr4 &= ~(X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PCE);
+
+ native_write_cr4(cr4);
+}
+#ifdef CONFIG_X86_64
+static inline unsigned long xen_read_cr8(void)
+{
+ return 0;
+}
+static inline void xen_write_cr8(unsigned long val)
+{
+ BUG_ON(val);
+}
+#endif
+
+static u64 xen_read_msr_safe(unsigned int msr, int *err)
+{
+ u64 val;
+
+ if (pmu_msr_read(msr, &val, err))
+ return val;
+
+ val = native_read_msr_safe(msr, err);
+ switch (msr) {
+ case MSR_IA32_APICBASE:
+#ifdef CONFIG_X86_X2APIC
+ if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
+#endif
+ val &= ~X2APIC_ENABLE;
+ break;
+ }
+ return val;
+}
+
+static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
+{
+ int ret;
+
+ ret = 0;
+
+ switch (msr) {
+#ifdef CONFIG_X86_64
+ unsigned which;
+ u64 base;
+
+ case MSR_FS_BASE: which = SEGBASE_FS; goto set;
+ case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set;
+ case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set;
+
+ set:
+ base = ((u64)high << 32) | low;
+ if (HYPERVISOR_set_segment_base(which, base) != 0)
+ ret = -EIO;
+ break;
+#endif
+
+ case MSR_STAR:
+ case MSR_CSTAR:
+ case MSR_LSTAR:
+ case MSR_SYSCALL_MASK:
+ case MSR_IA32_SYSENTER_CS:
+ case MSR_IA32_SYSENTER_ESP:
+ case MSR_IA32_SYSENTER_EIP:
+ /* Fast syscall setup is all done in hypercalls, so
+ these are all ignored. Stub them out here to stop
+ Xen console noise. */
+ break;
+
+ default:
+ if (!pmu_msr_write(msr, low, high, &ret))
+ ret = native_write_msr_safe(msr, low, high);
+ }
+
+ return ret;
+}
+
+static u64 xen_read_msr(unsigned int msr)
+{
+ /*
+ * This will silently swallow a #GP from RDMSR. It may be worth
+ * changing that.
+ */
+ int err;
+
+ return xen_read_msr_safe(msr, &err);
+}
+
+static void xen_write_msr(unsigned int msr, unsigned low, unsigned high)
+{
+ /*
+ * This will silently swallow a #GP from WRMSR. It may be worth
+ * changing that.
+ */
+ xen_write_msr_safe(msr, low, high);
+}
+
+void xen_setup_shared_info(void)
+{
+ if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ set_fixmap(FIX_PARAVIRT_BOOTMAP,
+ xen_start_info->shared_info);
+
+ HYPERVISOR_shared_info =
+ (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
+ } else
+ HYPERVISOR_shared_info =
+ (struct shared_info *)__va(xen_start_info->shared_info);
+
+#ifndef CONFIG_SMP
+ /* In UP this is as good a place as any to set up shared info */
+ xen_setup_vcpu_info_placement();
+#endif
+
+ xen_setup_mfn_list_list();
+}
+
+/* This is called once we have the cpu_possible_mask */
+void xen_setup_vcpu_info_placement(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ /* Set up direct vCPU id mapping for PV guests. */
+ per_cpu(xen_vcpu_id, cpu) = cpu;
+ xen_vcpu_setup(cpu);
+ }
+
+ /*
+ * xen_vcpu_setup managed to place the vcpu_info within the
+ * percpu area for all cpus, so make use of it.
+ */
+ if (xen_have_vcpu_info_placement) {
+ pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
+ pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
+ pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
+ pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct);
+ pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
+ }
+}
+
+static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
+ unsigned long addr, unsigned len)
+{
+ char *start, *end, *reloc;
+ unsigned ret;
+
+ start = end = reloc = NULL;
+
+#define SITE(op, x) \
+ case PARAVIRT_PATCH(op.x): \
+ if (xen_have_vcpu_info_placement) { \
+ start = (char *)xen_##x##_direct; \
+ end = xen_##x##_direct_end; \
+ reloc = xen_##x##_direct_reloc; \
+ } \
+ goto patch_site
+
+ switch (type) {
+ SITE(pv_irq_ops, irq_enable);
+ SITE(pv_irq_ops, irq_disable);
+ SITE(pv_irq_ops, save_fl);
+ SITE(pv_irq_ops, restore_fl);
+#undef SITE
+
+ patch_site:
+ if (start == NULL || (end-start) > len)
+ goto default_patch;
+
+ ret = paravirt_patch_insns(insnbuf, len, start, end);
+
+ /* Note: because reloc is assigned from something that
+ appears to be an array, gcc assumes it's non-null,
+ but doesn't know its relationship with start and
+ end. */
+ if (reloc > start && reloc < end) {
+ int reloc_off = reloc - start;
+ long *relocp = (long *)(insnbuf + reloc_off);
+ long delta = start - (char *)addr;
+
+ *relocp += delta;
+ }
+ break;
+
+ default_patch:
+ default:
+ ret = paravirt_patch_default(type, clobbers, insnbuf,
+ addr, len);
+ break;
+ }
+
+ return ret;
+}
+
+static const struct pv_info xen_info __initconst = {
+ .shared_kernel_pmd = 0,
+
+#ifdef CONFIG_X86_64
+ .extra_user_64bit_cs = FLAT_USER_CS64,
+#endif
+ .name = "Xen",
+};
+
+static const struct pv_init_ops xen_init_ops __initconst = {
+ .patch = xen_patch,
+};
+
+static const struct pv_cpu_ops xen_cpu_ops __initconst = {
+ .cpuid = xen_cpuid,
+
+ .set_debugreg = xen_set_debugreg,
+ .get_debugreg = xen_get_debugreg,
+
+ .read_cr0 = xen_read_cr0,
+ .write_cr0 = xen_write_cr0,
+
+ .read_cr4 = native_read_cr4,
+ .write_cr4 = xen_write_cr4,
+
+#ifdef CONFIG_X86_64
+ .read_cr8 = xen_read_cr8,
+ .write_cr8 = xen_write_cr8,
+#endif
+
+ .wbinvd = native_wbinvd,
+
+ .read_msr = xen_read_msr,
+ .write_msr = xen_write_msr,
+
+ .read_msr_safe = xen_read_msr_safe,
+ .write_msr_safe = xen_write_msr_safe,
+
+ .read_pmc = xen_read_pmc,
+
+ .iret = xen_iret,
+#ifdef CONFIG_X86_64
+ .usergs_sysret64 = xen_sysret64,
+#endif
+
+ .load_tr_desc = paravirt_nop,
+ .set_ldt = xen_set_ldt,
+ .load_gdt = xen_load_gdt,
+ .load_idt = xen_load_idt,
+ .load_tls = xen_load_tls,
+#ifdef CONFIG_X86_64
+ .load_gs_index = xen_load_gs_index,
+#endif
+
+ .alloc_ldt = xen_alloc_ldt,
+ .free_ldt = xen_free_ldt,
+
+ .store_idt = native_store_idt,
+ .store_tr = xen_store_tr,
+
+ .write_ldt_entry = xen_write_ldt_entry,
+ .write_gdt_entry = xen_write_gdt_entry,
+ .write_idt_entry = xen_write_idt_entry,
+ .load_sp0 = xen_load_sp0,
+
+ .set_iopl_mask = xen_set_iopl_mask,
+ .io_delay = xen_io_delay,
+
+ /* Xen takes care of %gs when switching to usermode for us */
+ .swapgs = paravirt_nop,
+
+ .start_context_switch = paravirt_start_context_switch,
+ .end_context_switch = xen_end_context_switch,
+};
+
+static void xen_restart(char *msg)
+{
+ xen_reboot(SHUTDOWN_reboot);
+}
+
+static void xen_machine_halt(void)
+{
+ xen_reboot(SHUTDOWN_poweroff);
+}
+
+static void xen_machine_power_off(void)
+{
+ if (pm_power_off)
+ pm_power_off();
+ xen_reboot(SHUTDOWN_poweroff);
+}
+
+static void xen_crash_shutdown(struct pt_regs *regs)
+{
+ xen_reboot(SHUTDOWN_crash);
+}
+
+static const struct machine_ops xen_machine_ops __initconst = {
+ .restart = xen_restart,
+ .halt = xen_machine_halt,
+ .power_off = xen_machine_power_off,
+ .shutdown = xen_machine_halt,
+ .crash_shutdown = xen_crash_shutdown,
+ .emergency_restart = xen_emergency_restart,
+};
+
+static unsigned char xen_get_nmi_reason(void)
+{
+ unsigned char reason = 0;
+
+ /* Construct a value which looks like it came from port 0x61. */
+ if (test_bit(_XEN_NMIREASON_io_error,
+ &HYPERVISOR_shared_info->arch.nmi_reason))
+ reason |= NMI_REASON_IOCHK;
+ if (test_bit(_XEN_NMIREASON_pci_serr,
+ &HYPERVISOR_shared_info->arch.nmi_reason))
+ reason |= NMI_REASON_SERR;
+
+ return reason;
+}
+
+static void __init xen_boot_params_init_edd(void)
+{
+#if IS_ENABLED(CONFIG_EDD)
+ struct xen_platform_op op;
+ struct edd_info *edd_info;
+ u32 *mbr_signature;
+ unsigned nr;
+ int ret;
+
+ edd_info = boot_params.eddbuf;
+ mbr_signature = boot_params.edd_mbr_sig_buffer;
+
+ op.cmd = XENPF_firmware_info;
+
+ op.u.firmware_info.type = XEN_FW_DISK_INFO;
+ for (nr = 0; nr < EDDMAXNR; nr++) {
+ struct edd_info *info = edd_info + nr;
+
+ op.u.firmware_info.index = nr;
+ info->params.length = sizeof(info->params);
+ set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params,
+ &info->params);
+ ret = HYPERVISOR_platform_op(&op);
+ if (ret)
+ break;
+
+#define C(x) info->x = op.u.firmware_info.u.disk_info.x
+ C(device);
+ C(version);
+ C(interface_support);
+ C(legacy_max_cylinder);
+ C(legacy_max_head);
+ C(legacy_sectors_per_track);
+#undef C
+ }
+ boot_params.eddbuf_entries = nr;
+
+ op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE;
+ for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) {
+ op.u.firmware_info.index = nr;
+ ret = HYPERVISOR_platform_op(&op);
+ if (ret)
+ break;
+ mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature;
+ }
+ boot_params.edd_mbr_sig_buf_entries = nr;
+#endif
+}
+
+/*
+ * Set up the GDT and segment registers for -fstack-protector. Until
+ * we do this, we have to be careful not to call any stack-protected
+ * function, which is most of the kernel.
+ */
+static void xen_setup_gdt(int cpu)
+{
+ pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
+ pv_cpu_ops.load_gdt = xen_load_gdt_boot;
+
+ setup_stack_canary_segment(0);
+ switch_to_new_gdt(0);
+
+ pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry;
+ pv_cpu_ops.load_gdt = xen_load_gdt;
+}
+
+static void __init xen_dom0_set_legacy_features(void)
+{
+ x86_platform.legacy.rtc = 1;
+}
+
+/* First C function to be called on Xen boot */
+asmlinkage __visible void __init xen_start_kernel(void)
+{
+ struct physdev_set_iopl set_iopl;
+ unsigned long initrd_start = 0;
+ int rc;
+
+ if (!xen_start_info)
+ return;
+
+ xen_domain_type = XEN_PV_DOMAIN;
+
+ xen_setup_features();
+
+ xen_setup_machphys_mapping();
+
+ /* Install Xen paravirt ops */
+ pv_info = xen_info;
+ pv_init_ops = xen_init_ops;
+ pv_cpu_ops = xen_cpu_ops;
+
+ x86_platform.get_nmi_reason = xen_get_nmi_reason;
+
+ x86_init.resources.memory_setup = xen_memory_setup;
+ x86_init.oem.arch_setup = xen_arch_setup;
+ x86_init.oem.banner = xen_banner;
+
+ xen_init_time_ops();
+
+ /*
+ * Set up some pagetable state before starting to set any ptes.
+ */
+
+ xen_init_mmu_ops();
+
+ /* Prevent unwanted bits from being set in PTEs. */
+ __supported_pte_mask &= ~_PAGE_GLOBAL;
+
+ /*
+ * Prevent page tables from being allocated in highmem, even
+ * if CONFIG_HIGHPTE is enabled.
+ */
+ __userpte_alloc_gfp &= ~__GFP_HIGHMEM;
+
+ /* Work out if we support NX */
+ x86_configure_nx();
+
+ /* Get mfn list */
+ xen_build_dynamic_phys_to_machine();
+
+ /*
+ * Set up kernel GDT and segment registers, mainly so that
+ * -fstack-protector code can be executed.
+ */
+ xen_setup_gdt(0);
+
+ xen_init_irq_ops();
+ xen_init_cpuid_mask();
+
+#ifdef CONFIG_X86_LOCAL_APIC
+ /*
+ * set up the basic apic ops.
+ */
+ xen_init_apic();
+#endif
+
+ if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
+ pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
+ pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
+ }
+
+ machine_ops = xen_machine_ops;
+
+ /*
+ * The only reliable way to retain the initial address of the
+ * percpu gdt_page is to remember it here, so we can go and
+ * mark it RW later, when the initial percpu area is freed.
+ */
+ xen_initial_gdt = &per_cpu(gdt_page, 0);
+
+ xen_smp_init();
+
+#ifdef CONFIG_ACPI_NUMA
+ /*
+ * The pages we from Xen are not related to machine pages, so
+ * any NUMA information the kernel tries to get from ACPI will
+ * be meaningless. Prevent it from trying.
+ */
+ acpi_numa = -1;
+#endif
+ /* Don't do the full vcpu_info placement stuff until we have a
+ possible map and a non-dummy shared_info. */
+ per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
+
+ WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_pv, xen_cpu_dead_pv));
+
+ local_irq_disable();
+ early_boot_irqs_disabled = true;
+
+ xen_raw_console_write("mapping kernel into physical memory\n");
+ xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base,
+ xen_start_info->nr_pages);
+ xen_reserve_special_pages();
+
+ /* keep using Xen gdt for now; no urgent need to change it */
+
+#ifdef CONFIG_X86_32
+ pv_info.kernel_rpl = 1;
+ if (xen_feature(XENFEAT_supervisor_mode_kernel))
+ pv_info.kernel_rpl = 0;
+#else
+ pv_info.kernel_rpl = 0;
+#endif
+ /* set the limit of our address space */
+ xen_reserve_top();
+
+ /*
+ * We used to do this in xen_arch_setup, but that is too late
+ * on AMD were early_cpu_init (run before ->arch_setup()) calls
+ * early_amd_init which pokes 0xcf8 port.
+ */
+ set_iopl.iopl = 1;
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
+ if (rc != 0)
+ xen_raw_printk("physdev_op failed %d\n", rc);
+
+#ifdef CONFIG_X86_32
+ /* set up basic CPUID stuff */
+ cpu_detect(&new_cpu_data);
+ set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU);
+ new_cpu_data.wp_works_ok = 1;
+ new_cpu_data.x86_capability[CPUID_1_EDX] = cpuid_edx(1);
+#endif
+
+ if (xen_start_info->mod_start) {
+ if (xen_start_info->flags & SIF_MOD_START_PFN)
+ initrd_start = PFN_PHYS(xen_start_info->mod_start);
+ else
+ initrd_start = __pa(xen_start_info->mod_start);
+ }
+
+ /* Poke various useful things into boot_params */
+ boot_params.hdr.type_of_loader = (9 << 4) | 0;
+ boot_params.hdr.ramdisk_image = initrd_start;
+ boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
+ boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
+ boot_params.hdr.hardware_subarch = X86_SUBARCH_XEN;
+
+ if (!xen_initial_domain()) {
+ add_preferred_console("xenboot", 0, NULL);
+ add_preferred_console("tty", 0, NULL);
+ add_preferred_console("hvc", 0, NULL);
+ if (pci_xen)
+ x86_init.pci.arch_init = pci_xen_init;
+ } else {
+ const struct dom0_vga_console_info *info =
+ (void *)((char *)xen_start_info +
+ xen_start_info->console.dom0.info_off);
+ struct xen_platform_op op = {
+ .cmd = XENPF_firmware_info,
+ .interface_version = XENPF_INTERFACE_VERSION,
+ .u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS,
+ };
+
+ x86_platform.set_legacy_features =
+ xen_dom0_set_legacy_features;
+ xen_init_vga(info, xen_start_info->console.dom0.info_size);
+ xen_start_info->console.domU.mfn = 0;
+ xen_start_info->console.domU.evtchn = 0;
+
+ if (HYPERVISOR_platform_op(&op) == 0)
+ boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags;
+
+ /* Make sure ACS will be enabled */
+ pci_request_acs();
+
+ xen_acpi_sleep_register();
+
+ /* Avoid searching for BIOS MP tables */
+ x86_init.mpparse.find_smp_config = x86_init_noop;
+ x86_init.mpparse.get_smp_config = x86_init_uint_noop;
+
+ xen_boot_params_init_edd();
+ }
+#ifdef CONFIG_PCI
+ /* PCI BIOS service won't work from a PV guest. */
+ pci_probe &= ~PCI_PROBE_BIOS;
+#endif
+ xen_raw_console_write("about to get started...\n");
+
+ /* Let's presume PV guests always boot on vCPU with id 0. */
+ per_cpu(xen_vcpu_id, 0) = 0;
+
+ xen_setup_runstate_info(0);
+
+ xen_efi_init();
+
+ /* Start the world */
+#ifdef CONFIG_X86_32
+ i386_start_kernel();
+#else
+ cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
+ x86_64_start_reservations((char *)__pa_symbol(&boot_params));
+#endif
+}
+
+static int xen_cpu_up_prepare_pv(unsigned int cpu)
+{
+ int rc;
+
+ xen_setup_timer(cpu);
+
+ rc = xen_smp_intr_init(cpu);
+ if (rc) {
+ WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
+ cpu, rc);
+ return rc;
+ }
+ return 0;
+}
+
+static int xen_cpu_dead_pv(unsigned int cpu)
+{
+ xen_smp_intr_free(cpu);
+
+ xen_teardown_timer(cpu);
+
+ return 0;
+}
+
+static uint32_t __init xen_platform_pv(void)
+{
+ if (xen_pv_domain())
+ return xen_cpuid_base();
+
+ return 0;
+}
+
+static void xen_set_cpu_features(struct cpuinfo_x86 *c)
+{
+ clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
+ set_cpu_cap(c, X86_FEATURE_XENPV);
+}
+
+static void xen_pin_vcpu(int cpu)
+{
+ static bool disable_pinning;
+ struct sched_pin_override pin_override;
+ int ret;
+
+ if (disable_pinning)
+ return;
+
+ pin_override.pcpu = cpu;
+ ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
+
+ /* Ignore errors when removing override. */
+ if (cpu < 0)
+ return;
+
+ switch (ret) {
+ case -ENOSYS:
+ pr_warn("Unable to pin on physical cpu %d. In case of problems consider vcpu pinning.\n",
+ cpu);
+ disable_pinning = true;
+ break;
+ case -EPERM:
+ WARN(1, "Trying to pin vcpu without having privilege to do so\n");
+ disable_pinning = true;
+ break;
+ case -EINVAL:
+ case -EBUSY:
+ pr_warn("Physical cpu %d not available for pinning. Check Xen cpu configuration.\n",
+ cpu);
+ break;
+ case 0:
+ break;
+ default:
+ WARN(1, "rc %d while trying to pin vcpu\n", ret);
+ disable_pinning = true;
+ }
+}
+
+const struct hypervisor_x86 x86_hyper_xen_pv = {
+ .name = "Xen PV",
+ .detect = xen_platform_pv,
+ .set_cpu_features = xen_set_cpu_features,
+ .pin_vcpu = xen_pin_vcpu,
+};
+EXPORT_SYMBOL(x86_hyper_xen_pv);
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 07/21] x86/xen: split xen_smp_intr_init()/xen_smp_intr_free()
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (5 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 06/21] x86/xen: split off enlighten_pv.c Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 7:30 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 08/21] x86/xen: split xen_smp_prepare_boot_cpu() Vitaly Kuznetsov
` (14 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
xen_smp_intr_init() and xen_smp_intr_free() have PV-specific code and as
a praparatory change to splitting smp.c we need to split these fucntions.
Create xen_smp_intr_init_pv()/xen_smp_intr_free_pv().
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/enlighten_pv.c | 9 +++++++++
arch/x86/xen/smp.c | 29 ++++++++++++++++++-----------
arch/x86/xen/smp.h | 8 ++++++++
3 files changed, 35 insertions(+), 11 deletions(-)
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index b9ff23c..acfd896 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1478,12 +1478,21 @@ static int xen_cpu_up_prepare_pv(unsigned int cpu)
cpu, rc);
return rc;
}
+
+ rc = xen_smp_intr_init_pv(cpu);
+ if (rc) {
+ WARN(1, "xen_smp_intr_init_pv() for CPU %d failed: %d\n",
+ cpu, rc);
+ return rc;
+ }
+
return 0;
}
static int xen_cpu_dead_pv(unsigned int cpu)
{
xen_smp_intr_free(cpu);
+ xen_smp_intr_free_pv(cpu);
xen_teardown_timer(cpu);
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 0dee6f5..ff6aaff 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -132,9 +132,10 @@ void xen_smp_intr_free(unsigned int cpu)
kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
}
- if (xen_hvm_domain())
- return;
+}
+void xen_smp_intr_free_pv(unsigned int cpu)
+{
if (per_cpu(xen_irq_work, cpu).irq >= 0) {
unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
per_cpu(xen_irq_work, cpu).irq = -1;
@@ -148,11 +149,12 @@ void xen_smp_intr_free(unsigned int cpu)
kfree(per_cpu(xen_pmu_irq, cpu).name);
per_cpu(xen_pmu_irq, cpu).name = NULL;
}
-};
+}
+
int xen_smp_intr_init(unsigned int cpu)
{
int rc;
- char *resched_name, *callfunc_name, *debug_name, *pmu_name;
+ char *resched_name, *callfunc_name, *debug_name;
resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
@@ -199,12 +201,17 @@ int xen_smp_intr_init(unsigned int cpu)
per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
- /*
- * The IRQ worker on PVHVM goes through the native path and uses the
- * IPI mechanism.
- */
- if (xen_hvm_domain())
- return 0;
+ return 0;
+
+ fail:
+ xen_smp_intr_free(cpu);
+ return rc;
+}
+
+int xen_smp_intr_init_pv(unsigned int cpu)
+{
+ int rc;
+ char *callfunc_name, *pmu_name;
callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
@@ -233,7 +240,7 @@ int xen_smp_intr_init(unsigned int cpu)
return 0;
fail:
- xen_smp_intr_free(cpu);
+ xen_smp_intr_free_pv(cpu);
return rc;
}
diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
index 9beef33..a059adb 100644
--- a/arch/x86/xen/smp.h
+++ b/arch/x86/xen/smp.h
@@ -11,6 +11,8 @@ extern void xen_send_IPI_self(int vector);
extern int xen_smp_intr_init(unsigned int cpu);
extern void xen_smp_intr_free(unsigned int cpu);
+extern int xen_smp_intr_init_pv(unsigned int cpu);
+extern void xen_smp_intr_free_pv(unsigned int cpu);
#else /* CONFIG_SMP */
@@ -19,6 +21,12 @@ static inline int xen_smp_intr_init(unsigned int cpu)
return 0;
}
static inline void xen_smp_intr_free(unsigned int cpu) {}
+
+static inline int xen_smp_intr_init_pv(unsigned int cpu)
+{
+ return 0;
+}
+static inline void xen_smp_intr_free_pv(unsigned int cpu) {}
#endif /* CONFIG_SMP */
#endif
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 08/21] x86/xen: split xen_smp_prepare_boot_cpu()
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (6 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 07/21] x86/xen: split xen_smp_intr_init()/xen_smp_intr_free() Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 7:33 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 09/21] x86/xen: split xen_cpu_die() Vitaly Kuznetsov
` (13 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Split xen_smp_prepare_boot_cpu() into xen_pv_smp_prepare_boot_cpu() and
xen_hvm_smp_prepare_boot_cpu() to support further splitting of smp.c.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/smp.c | 49 ++++++++++++++++++++++++++++++-------------------
1 file changed, 30 insertions(+), 19 deletions(-)
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index ff6aaff..6c8a3a5 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -296,35 +296,46 @@ static void __init xen_filter_cpu_maps(void)
}
-static void __init xen_smp_prepare_boot_cpu(void)
+static void __init xen_pv_smp_prepare_boot_cpu(void)
{
BUG_ON(smp_processor_id() != 0);
native_smp_prepare_boot_cpu();
- if (xen_pv_domain()) {
- if (!xen_feature(XENFEAT_writable_page_tables))
- /* We've switched to the "real" per-cpu gdt, so make
- * sure the old memory can be recycled. */
- make_lowmem_page_readwrite(xen_initial_gdt);
+ if (!xen_feature(XENFEAT_writable_page_tables))
+ /* We've switched to the "real" per-cpu gdt, so make
+ * sure the old memory can be recycled. */
+ make_lowmem_page_readwrite(xen_initial_gdt);
#ifdef CONFIG_X86_32
- /*
- * Xen starts us with XEN_FLAT_RING1_DS, but linux code
- * expects __USER_DS
- */
- loadsegment(ds, __USER_DS);
- loadsegment(es, __USER_DS);
+ /*
+ * Xen starts us with XEN_FLAT_RING1_DS, but linux code
+ * expects __USER_DS
+ */
+ loadsegment(ds, __USER_DS);
+ loadsegment(es, __USER_DS);
#endif
- xen_filter_cpu_maps();
- xen_setup_vcpu_info_placement();
- }
+ xen_filter_cpu_maps();
+ xen_setup_vcpu_info_placement();
+
+ /*
+ * The alternative logic (which patches the unlock/lock) runs before
+ * the smp bootup up code is activated. Hence we need to set this up
+ * the core kernel is being patched. Otherwise we will have only
+ * modules patched but not core code.
+ */
+ xen_init_spinlocks();
+}
+
+static void __init xen_hvm_smp_prepare_boot_cpu(void)
+{
+ BUG_ON(smp_processor_id() != 0);
+ native_smp_prepare_boot_cpu();
/*
* Setup vcpu_info for boot CPU.
*/
- if (xen_hvm_domain())
- xen_vcpu_setup(0);
+ xen_vcpu_setup(0);
/*
* The alternative logic (which patches the unlock/lock) runs before
@@ -716,7 +727,7 @@ static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
}
static const struct smp_ops xen_smp_ops __initconst = {
- .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
+ .smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
.smp_prepare_cpus = xen_smp_prepare_cpus,
.smp_cpus_done = xen_smp_cpus_done,
@@ -753,5 +764,5 @@ void __init xen_hvm_smp_init(void)
smp_ops.cpu_die = xen_cpu_die;
smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
- smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu;
+ smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
}
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 09/21] x86/xen: split xen_cpu_die()
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (7 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 08/21] x86/xen: split xen_smp_prepare_boot_cpu() Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 7:34 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 10/21] x86/xen: split off smp_hvm.c Vitaly Kuznetsov
` (12 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Split xen_cpu_die() into xen_pv_cpu_die() and xen_hvm_cpu_die() to support
further splitting of smp.c.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/smp.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 6c8a3a5..6c4b415 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -513,10 +513,10 @@ static int xen_cpu_disable(void)
return 0;
}
-static void xen_cpu_die(unsigned int cpu)
+static void xen_pv_cpu_die(unsigned int cpu)
{
- while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up,
- xen_vcpu_nr(cpu), NULL)) {
+ while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
+ xen_vcpu_nr(cpu), NULL)) {
__set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/10);
}
@@ -529,6 +529,15 @@ static void xen_cpu_die(unsigned int cpu)
}
}
+static void xen_hvm_cpu_die(unsigned int cpu)
+{
+ if (common_cpu_die(cpu) == 0) {
+ xen_smp_intr_free(cpu);
+ xen_uninit_lock_cpu(cpu);
+ xen_teardown_timer(cpu);
+ }
+}
+
static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
{
play_dead_common();
@@ -551,7 +560,12 @@ static int xen_cpu_disable(void)
return -ENOSYS;
}
-static void xen_cpu_die(unsigned int cpu)
+static void xen_pv_cpu_die(unsigned int cpu)
+{
+ BUG();
+}
+
+static void xen_hvm_cpu_die(unsigned int cpu)
{
BUG();
}
@@ -732,7 +746,7 @@ static const struct smp_ops xen_smp_ops __initconst = {
.smp_cpus_done = xen_smp_cpus_done,
.cpu_up = xen_cpu_up,
- .cpu_die = xen_cpu_die,
+ .cpu_die = xen_pv_cpu_die,
.cpu_disable = xen_cpu_disable,
.play_dead = xen_play_dead,
@@ -761,7 +775,7 @@ void __init xen_hvm_smp_init(void)
{
smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
- smp_ops.cpu_die = xen_cpu_die;
+ smp_ops.cpu_die = xen_hvm_cpu_die;
smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 10/21] x86/xen: split off smp_hvm.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (8 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 09/21] x86/xen: split xen_cpu_die() Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 7:37 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 11/21] x86/xen: split off smp_pv.c Vitaly Kuznetsov
` (11 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Move PVHVM related code to smp_hvm.c. Drop 'static' qualifier from
xen_smp_send_reschedule(), xen_smp_send_call_function_ipi(),
xen_smp_send_call_function_single_ipi(), these functions will be moved to
common smp code when smp_pv.c is split.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Kconfig | 4 ++++
arch/x86/xen/Makefile | 1 +
arch/x86/xen/smp.c | 57 +++----------------------------------------------
arch/x86/xen/smp.h | 3 +++
arch/x86/xen/smp_hvm.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 69 insertions(+), 54 deletions(-)
create mode 100644 arch/x86/xen/smp_hvm.c
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index c387560..dae8dc6 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -37,6 +37,10 @@ config XEN_PVHVM
help
Support running as a Xen PVHVM guest.
+config XEN_PVHVM_SMP
+ def_bool y
+ depends on XEN_PVHVM && SMP
+
config XEN_512GB
bool "Limit Xen pv-domain memory to 512GB"
depends on XEN_PV && X86_64
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 5ca8d3eb..bc7df8c 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_XEN_PVHVM_SMP) += smp_hvm.o
obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_DOM0) += vga.o
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 6c4b415..c692336 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -327,25 +327,6 @@ static void __init xen_pv_smp_prepare_boot_cpu(void)
xen_init_spinlocks();
}
-static void __init xen_hvm_smp_prepare_boot_cpu(void)
-{
- BUG_ON(smp_processor_id() != 0);
- native_smp_prepare_boot_cpu();
-
- /*
- * Setup vcpu_info for boot CPU.
- */
- xen_vcpu_setup(0);
-
- /*
- * The alternative logic (which patches the unlock/lock) runs before
- * the smp bootup up code is activated. Hence we need to set this up
- * the core kernel is being patched. Otherwise we will have only
- * modules patched but not core code.
- */
- xen_init_spinlocks();
-}
-
static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
{
unsigned cpu;
@@ -529,15 +510,6 @@ static void xen_pv_cpu_die(unsigned int cpu)
}
}
-static void xen_hvm_cpu_die(unsigned int cpu)
-{
- if (common_cpu_die(cpu) == 0) {
- xen_smp_intr_free(cpu);
- xen_uninit_lock_cpu(cpu);
- xen_teardown_timer(cpu);
- }
-}
-
static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
{
play_dead_common();
@@ -565,11 +537,6 @@ static void xen_pv_cpu_die(unsigned int cpu)
BUG();
}
-static void xen_hvm_cpu_die(unsigned int cpu)
-{
- BUG();
-}
-
static void xen_play_dead(void)
{
BUG();
@@ -595,7 +562,7 @@ static void xen_stop_other_cpus(int wait)
smp_call_function(stop_self, NULL, wait);
}
-static void xen_smp_send_reschedule(int cpu)
+void xen_smp_send_reschedule(int cpu)
{
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
}
@@ -609,7 +576,7 @@ static void __xen_send_IPI_mask(const struct cpumask *mask,
xen_send_IPI_one(cpu, vector);
}
-static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
+void xen_smp_send_call_function_ipi(const struct cpumask *mask)
{
int cpu;
@@ -624,7 +591,7 @@ static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
}
}
-static void xen_smp_send_call_function_single_ipi(int cpu)
+void xen_smp_send_call_function_single_ipi(int cpu)
{
__xen_send_IPI_mask(cpumask_of(cpu),
XEN_CALL_FUNCTION_SINGLE_VECTOR);
@@ -762,21 +729,3 @@ void __init xen_smp_init(void)
smp_ops = xen_smp_ops;
xen_fill_possible_map();
}
-
-static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
-{
- native_smp_prepare_cpus(max_cpus);
- WARN_ON(xen_smp_intr_init(0));
-
- xen_init_lock_cpu(0);
-}
-
-void __init xen_hvm_smp_init(void)
-{
- smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
- smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
- smp_ops.cpu_die = xen_hvm_cpu_die;
- smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
- smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
- smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
-}
diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
index a059adb..bf36e79 100644
--- a/arch/x86/xen/smp.h
+++ b/arch/x86/xen/smp.h
@@ -14,6 +14,9 @@ extern void xen_smp_intr_free(unsigned int cpu);
extern int xen_smp_intr_init_pv(unsigned int cpu);
extern void xen_smp_intr_free_pv(unsigned int cpu);
+extern void xen_smp_send_reschedule(int cpu);
+extern void xen_smp_send_call_function_ipi(const struct cpumask *mask);
+extern void xen_smp_send_call_function_single_ipi(int cpu);
#else /* CONFIG_SMP */
static inline int xen_smp_intr_init(unsigned int cpu)
diff --git a/arch/x86/xen/smp_hvm.c b/arch/x86/xen/smp_hvm.c
new file mode 100644
index 0000000..8bed434
--- /dev/null
+++ b/arch/x86/xen/smp_hvm.c
@@ -0,0 +1,58 @@
+#include <asm/smp.h>
+
+#include "xen-ops.h"
+#include "smp.h"
+
+
+static void __init xen_hvm_smp_prepare_boot_cpu(void)
+{
+ BUG_ON(smp_processor_id() != 0);
+ native_smp_prepare_boot_cpu();
+
+ /*
+ * Setup vcpu_info for boot CPU.
+ */
+ xen_vcpu_setup(0);
+
+ /*
+ * The alternative logic (which patches the unlock/lock) runs before
+ * the smp bootup up code is activated. Hence we need to set this up
+ * the core kernel is being patched. Otherwise we will have only
+ * modules patched but not core code.
+ */
+ xen_init_spinlocks();
+}
+
+static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
+{
+ native_smp_prepare_cpus(max_cpus);
+ WARN_ON(xen_smp_intr_init(0));
+
+ xen_init_lock_cpu(0);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void xen_hvm_cpu_die(unsigned int cpu)
+{
+ if (common_cpu_die(cpu) == 0) {
+ xen_smp_intr_free(cpu);
+ xen_uninit_lock_cpu(cpu);
+ xen_teardown_timer(cpu);
+ }
+}
+#else
+static void xen_hvm_cpu_die(unsigned int cpu)
+{
+ BUG();
+}
+#endif
+
+void __init xen_hvm_smp_init(void)
+{
+ smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
+ smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
+ smp_ops.cpu_die = xen_hvm_cpu_die;
+ smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
+ smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
+ smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
+}
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* Re: [PATCH v2 10/21] x86/xen: split off smp_hvm.c
2017-03-02 17:53 ` [PATCH v2 10/21] x86/xen: split off smp_hvm.c Vitaly Kuznetsov
@ 2017-03-13 7:37 ` Juergen Gross
0 siblings, 0 replies; 44+ messages in thread
From: Juergen Gross @ 2017-03-13 7:37 UTC (permalink / raw)
To: Vitaly Kuznetsov, xen-devel
Cc: x86, linux-kernel, Boris Ostrovsky, Andrew Jones
On 02/03/17 18:53, Vitaly Kuznetsov wrote:
> Move PVHVM related code to smp_hvm.c. Drop 'static' qualifier from
> xen_smp_send_reschedule(), xen_smp_send_call_function_ipi(),
> xen_smp_send_call_function_single_ipi(), these functions will be moved to
> common smp code when smp_pv.c is split.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
One nit below, with this addressed:
Reviewed-by: Juergen Gross <jgross@suse.com>
> ---
> arch/x86/xen/Kconfig | 4 ++++
> arch/x86/xen/Makefile | 1 +
> arch/x86/xen/smp.c | 57 +++----------------------------------------------
> arch/x86/xen/smp.h | 3 +++
> arch/x86/xen/smp_hvm.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 69 insertions(+), 54 deletions(-)
> create mode 100644 arch/x86/xen/smp_hvm.c
>
> diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
> index a059adb..bf36e79 100644
> --- a/arch/x86/xen/smp.h
> +++ b/arch/x86/xen/smp.h
> @@ -14,6 +14,9 @@ extern void xen_smp_intr_free(unsigned int cpu);
> extern int xen_smp_intr_init_pv(unsigned int cpu);
> extern void xen_smp_intr_free_pv(unsigned int cpu);
>
> +extern void xen_smp_send_reschedule(int cpu);
> +extern void xen_smp_send_call_function_ipi(const struct cpumask *mask);
> +extern void xen_smp_send_call_function_single_ipi(int cpu);
Could you please drop the "extern" qualifier when adding new function
prototypes? I know this just follows the style of the file, but I'd
prefer not to add new instances.
Juergen
^ permalink raw reply [flat|nested] 44+ messages in thread
* [PATCH v2 11/21] x86/xen: split off smp_pv.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (9 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 10/21] x86/xen: split off smp_hvm.c Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:33 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 12/21] x86/xen: split off mmu_hvm.c Vitaly Kuznetsov
` (10 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Basically, smp.c is renamed to smp_pv.c and some code moved out to common
smp.c. struct xen_common_irq delcaration ended up in smp.h.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Makefile | 2 +-
arch/x86/xen/smp.c | 487 +-----------------------------------------------
arch/x86/xen/smp.h | 5 +
arch/x86/xen/smp_pv.c | 499 ++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 508 insertions(+), 485 deletions(-)
create mode 100644 arch/x86/xen/smp_pv.c
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index bc7df8c..ebf3522 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -20,7 +20,7 @@ obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
-obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_SMP) += smp.o smp_pv.o
obj-$(CONFIG_XEN_PVHVM_SMP) += smp_hvm.o
obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index c692336..82ac611 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -1,62 +1,21 @@
-/*
- * Xen SMP support
- *
- * This file implements the Xen versions of smp_ops. SMP under Xen is
- * very straightforward. Bringing a CPU up is simply a matter of
- * loading its initial context and setting it running.
- *
- * IPIs are handled through the Xen event mechanism.
- *
- * Because virtual CPUs can be scheduled onto any real CPU, there's no
- * useful topology information for the kernel to make use of. As a
- * result, all CPUs are treated as if they're single-core and
- * single-threaded.
- */
-#include <linux/sched.h>
-#include <linux/err.h>
-#include <linux/slab.h>
#include <linux/smp.h>
-#include <linux/irq_work.h>
-#include <linux/tick.h>
-
-#include <asm/paravirt.h>
-#include <asm/desc.h>
-#include <asm/pgtable.h>
-#include <asm/cpu.h>
-
-#include <xen/interface/xen.h>
-#include <xen/interface/vcpu.h>
-#include <xen/interface/xenpmu.h>
-
-#include <asm/xen/interface.h>
-#include <asm/xen/hypercall.h>
+#include <linux/slab.h>
+#include <linux/cpumask.h>
+#include <linux/percpu.h>
-#include <xen/xen.h>
-#include <xen/page.h>
#include <xen/events.h>
#include <xen/hvc-console.h>
#include "xen-ops.h"
-#include "mmu.h"
#include "smp.h"
-#include "pmu.h"
-
-cpumask_var_t xen_cpu_initialized_map;
-struct xen_common_irq {
- int irq;
- char *name;
-};
static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
-static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
-static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
-static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
/*
* Reschedule call back.
@@ -69,42 +28,6 @@ static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static void cpu_bringup(void)
-{
- int cpu;
-
- cpu_init();
- touch_softlockup_watchdog();
- preempt_disable();
-
- /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
- if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
- xen_enable_sysenter();
- xen_enable_syscall();
- }
- cpu = smp_processor_id();
- smp_store_cpu_info(cpu);
- cpu_data(cpu).x86_max_cores = 1;
- set_cpu_sibling_map(cpu);
-
- xen_setup_cpu_clockevents();
-
- notify_cpu_starting(cpu);
-
- set_cpu_online(cpu, true);
-
- cpu_set_state_online(cpu); /* Implies full memory barrier. */
-
- /* We can take interrupts now: we're officially "up". */
- local_irq_enable();
-}
-
-asmlinkage __visible void cpu_bringup_and_idle(void)
-{
- cpu_bringup();
- cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
-}
-
void xen_smp_intr_free(unsigned int cpu)
{
if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
@@ -134,23 +57,6 @@ void xen_smp_intr_free(unsigned int cpu)
}
}
-void xen_smp_intr_free_pv(unsigned int cpu)
-{
- if (per_cpu(xen_irq_work, cpu).irq >= 0) {
- unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
- per_cpu(xen_irq_work, cpu).irq = -1;
- kfree(per_cpu(xen_irq_work, cpu).name);
- per_cpu(xen_irq_work, cpu).name = NULL;
- }
-
- if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
- unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
- per_cpu(xen_pmu_irq, cpu).irq = -1;
- kfree(per_cpu(xen_pmu_irq, cpu).name);
- per_cpu(xen_pmu_irq, cpu).name = NULL;
- }
-}
-
int xen_smp_intr_init(unsigned int cpu)
{
int rc;
@@ -208,360 +114,6 @@ int xen_smp_intr_init(unsigned int cpu)
return rc;
}
-int xen_smp_intr_init_pv(unsigned int cpu)
-{
- int rc;
- char *callfunc_name, *pmu_name;
-
- callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
- rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
- cpu,
- xen_irq_work_interrupt,
- IRQF_PERCPU|IRQF_NOBALANCING,
- callfunc_name,
- NULL);
- if (rc < 0)
- goto fail;
- per_cpu(xen_irq_work, cpu).irq = rc;
- per_cpu(xen_irq_work, cpu).name = callfunc_name;
-
- if (is_xen_pmu(cpu)) {
- pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
- rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
- xen_pmu_irq_handler,
- IRQF_PERCPU|IRQF_NOBALANCING,
- pmu_name, NULL);
- if (rc < 0)
- goto fail;
- per_cpu(xen_pmu_irq, cpu).irq = rc;
- per_cpu(xen_pmu_irq, cpu).name = pmu_name;
- }
-
- return 0;
-
- fail:
- xen_smp_intr_free_pv(cpu);
- return rc;
-}
-
-static void __init xen_fill_possible_map(void)
-{
- int i, rc;
-
- if (xen_initial_domain())
- return;
-
- for (i = 0; i < nr_cpu_ids; i++) {
- rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
- if (rc >= 0) {
- num_processors++;
- set_cpu_possible(i, true);
- }
- }
-}
-
-static void __init xen_filter_cpu_maps(void)
-{
- int i, rc;
- unsigned int subtract = 0;
-
- if (!xen_initial_domain())
- return;
-
- num_processors = 0;
- disabled_cpus = 0;
- for (i = 0; i < nr_cpu_ids; i++) {
- rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
- if (rc >= 0) {
- num_processors++;
- set_cpu_possible(i, true);
- } else {
- set_cpu_possible(i, false);
- set_cpu_present(i, false);
- subtract++;
- }
- }
-#ifdef CONFIG_HOTPLUG_CPU
- /* This is akin to using 'nr_cpus' on the Linux command line.
- * Which is OK as when we use 'dom0_max_vcpus=X' we can only
- * have up to X, while nr_cpu_ids is greater than X. This
- * normally is not a problem, except when CPU hotplugging
- * is involved and then there might be more than X CPUs
- * in the guest - which will not work as there is no
- * hypercall to expand the max number of VCPUs an already
- * running guest has. So cap it up to X. */
- if (subtract)
- nr_cpu_ids = nr_cpu_ids - subtract;
-#endif
-
-}
-
-static void __init xen_pv_smp_prepare_boot_cpu(void)
-{
- BUG_ON(smp_processor_id() != 0);
- native_smp_prepare_boot_cpu();
-
- if (!xen_feature(XENFEAT_writable_page_tables))
- /* We've switched to the "real" per-cpu gdt, so make
- * sure the old memory can be recycled. */
- make_lowmem_page_readwrite(xen_initial_gdt);
-
-#ifdef CONFIG_X86_32
- /*
- * Xen starts us with XEN_FLAT_RING1_DS, but linux code
- * expects __USER_DS
- */
- loadsegment(ds, __USER_DS);
- loadsegment(es, __USER_DS);
-#endif
-
- xen_filter_cpu_maps();
- xen_setup_vcpu_info_placement();
-
- /*
- * The alternative logic (which patches the unlock/lock) runs before
- * the smp bootup up code is activated. Hence we need to set this up
- * the core kernel is being patched. Otherwise we will have only
- * modules patched but not core code.
- */
- xen_init_spinlocks();
-}
-
-static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
-{
- unsigned cpu;
- unsigned int i;
-
- if (skip_ioapic_setup) {
- char *m = (max_cpus == 0) ?
- "The nosmp parameter is incompatible with Xen; " \
- "use Xen dom0_max_vcpus=1 parameter" :
- "The noapic parameter is incompatible with Xen";
-
- xen_raw_printk(m);
- panic(m);
- }
- xen_init_lock_cpu(0);
-
- smp_store_boot_cpu_info();
- cpu_data(0).x86_max_cores = 1;
-
- for_each_possible_cpu(i) {
- zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
- zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
- zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
- }
- set_cpu_sibling_map(0);
-
- xen_pmu_init(0);
-
- if (xen_smp_intr_init(0))
- BUG();
-
- if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
- panic("could not allocate xen_cpu_initialized_map\n");
-
- cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
-
- /* Restrict the possible_map according to max_cpus. */
- while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
- for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
- continue;
- set_cpu_possible(cpu, false);
- }
-
- for_each_possible_cpu(cpu)
- set_cpu_present(cpu, true);
-}
-
-static int
-cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
-{
- struct vcpu_guest_context *ctxt;
- struct desc_struct *gdt;
- unsigned long gdt_mfn;
-
- /* used to tell cpu_init() that it can proceed with initialization */
- cpumask_set_cpu(cpu, cpu_callout_mask);
- if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
- return 0;
-
- ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
- if (ctxt == NULL)
- return -ENOMEM;
-
- gdt = get_cpu_gdt_table(cpu);
-
-#ifdef CONFIG_X86_32
- ctxt->user_regs.fs = __KERNEL_PERCPU;
- ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
-#endif
- memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
-
- ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
- ctxt->flags = VGCF_IN_KERNEL;
- ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
- ctxt->user_regs.ds = __USER_DS;
- ctxt->user_regs.es = __USER_DS;
- ctxt->user_regs.ss = __KERNEL_DS;
-
- xen_copy_trap_info(ctxt->trap_ctxt);
-
- ctxt->ldt_ents = 0;
-
- BUG_ON((unsigned long)gdt & ~PAGE_MASK);
-
- gdt_mfn = arbitrary_virt_to_mfn(gdt);
- make_lowmem_page_readonly(gdt);
- make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
-
- ctxt->gdt_frames[0] = gdt_mfn;
- ctxt->gdt_ents = GDT_ENTRIES;
-
- ctxt->kernel_ss = __KERNEL_DS;
- ctxt->kernel_sp = idle->thread.sp0;
-
-#ifdef CONFIG_X86_32
- ctxt->event_callback_cs = __KERNEL_CS;
- ctxt->failsafe_callback_cs = __KERNEL_CS;
-#else
- ctxt->gs_base_kernel = per_cpu_offset(cpu);
-#endif
- ctxt->event_callback_eip =
- (unsigned long)xen_hypervisor_callback;
- ctxt->failsafe_callback_eip =
- (unsigned long)xen_failsafe_callback;
- ctxt->user_regs.cs = __KERNEL_CS;
- per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
-
- ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
- ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
- if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
- BUG();
-
- kfree(ctxt);
- return 0;
-}
-
-static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
-{
- int rc;
-
- common_cpu_up(cpu, idle);
-
- xen_setup_runstate_info(cpu);
-
- /*
- * PV VCPUs are always successfully taken down (see 'while' loop
- * in xen_cpu_die()), so -EBUSY is an error.
- */
- rc = cpu_check_up_prepare(cpu);
- if (rc)
- return rc;
-
- /* make sure interrupts start blocked */
- per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
-
- rc = cpu_initialize_context(cpu, idle);
- if (rc)
- return rc;
-
- xen_pmu_init(cpu);
-
- rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
- BUG_ON(rc);
-
- while (cpu_report_state(cpu) != CPU_ONLINE)
- HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
-
- return 0;
-}
-
-static void xen_smp_cpus_done(unsigned int max_cpus)
-{
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-static int xen_cpu_disable(void)
-{
- unsigned int cpu = smp_processor_id();
- if (cpu == 0)
- return -EBUSY;
-
- cpu_disable_common();
-
- load_cr3(swapper_pg_dir);
- return 0;
-}
-
-static void xen_pv_cpu_die(unsigned int cpu)
-{
- while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
- xen_vcpu_nr(cpu), NULL)) {
- __set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(HZ/10);
- }
-
- if (common_cpu_die(cpu) == 0) {
- xen_smp_intr_free(cpu);
- xen_uninit_lock_cpu(cpu);
- xen_teardown_timer(cpu);
- xen_pmu_finish(cpu);
- }
-}
-
-static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
-{
- play_dead_common();
- HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
- cpu_bringup();
- /*
- * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
- * clears certain data that the cpu_idle loop (which called us
- * and that we return from) expects. The only way to get that
- * data back is to call:
- */
- tick_nohz_idle_enter();
-
- cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
-}
-
-#else /* !CONFIG_HOTPLUG_CPU */
-static int xen_cpu_disable(void)
-{
- return -ENOSYS;
-}
-
-static void xen_pv_cpu_die(unsigned int cpu)
-{
- BUG();
-}
-
-static void xen_play_dead(void)
-{
- BUG();
-}
-
-#endif
-static void stop_self(void *v)
-{
- int cpu = smp_processor_id();
-
- /* make sure we're not pinning something down */
- load_cr3(swapper_pg_dir);
- /* should set up a minimal gdt */
-
- set_cpu_online(cpu, false);
-
- HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
- BUG();
-}
-
-static void xen_stop_other_cpus(int wait)
-{
- smp_call_function(stop_self, NULL, wait);
-}
-
void xen_smp_send_reschedule(int cpu)
{
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
@@ -696,36 +248,3 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-
-static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
-{
- irq_enter();
- irq_work_run();
- inc_irq_stat(apic_irq_work_irqs);
- irq_exit();
-
- return IRQ_HANDLED;
-}
-
-static const struct smp_ops xen_smp_ops __initconst = {
- .smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
- .smp_prepare_cpus = xen_smp_prepare_cpus,
- .smp_cpus_done = xen_smp_cpus_done,
-
- .cpu_up = xen_cpu_up,
- .cpu_die = xen_pv_cpu_die,
- .cpu_disable = xen_cpu_disable,
- .play_dead = xen_play_dead,
-
- .stop_other_cpus = xen_stop_other_cpus,
- .smp_send_reschedule = xen_smp_send_reschedule,
-
- .send_call_func_ipi = xen_smp_send_call_function_ipi,
- .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
-};
-
-void __init xen_smp_init(void)
-{
- smp_ops = xen_smp_ops;
- xen_fill_possible_map();
-}
diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
index bf36e79..3245343 100644
--- a/arch/x86/xen/smp.h
+++ b/arch/x86/xen/smp.h
@@ -17,6 +17,11 @@ extern void xen_smp_intr_free_pv(unsigned int cpu);
extern void xen_smp_send_reschedule(int cpu);
extern void xen_smp_send_call_function_ipi(const struct cpumask *mask);
extern void xen_smp_send_call_function_single_ipi(int cpu);
+
+struct xen_common_irq {
+ int irq;
+ char *name;
+};
#else /* CONFIG_SMP */
static inline int xen_smp_intr_init(unsigned int cpu)
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
new file mode 100644
index 0000000..e20718a
--- /dev/null
+++ b/arch/x86/xen/smp_pv.c
@@ -0,0 +1,499 @@
+/*
+ * Xen SMP support
+ *
+ * This file implements the Xen versions of smp_ops. SMP under Xen is
+ * very straightforward. Bringing a CPU up is simply a matter of
+ * loading its initial context and setting it running.
+ *
+ * IPIs are handled through the Xen event mechanism.
+ *
+ * Because virtual CPUs can be scheduled onto any real CPU, there's no
+ * useful topology information for the kernel to make use of. As a
+ * result, all CPUs are treated as if they're single-core and
+ * single-threaded.
+ */
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/irq_work.h>
+#include <linux/tick.h>
+
+#include <asm/paravirt.h>
+#include <asm/desc.h>
+#include <asm/pgtable.h>
+#include <asm/cpu.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/vcpu.h>
+#include <xen/interface/xenpmu.h>
+
+#include <asm/xen/interface.h>
+#include <asm/xen/hypercall.h>
+
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/events.h>
+
+#include <xen/hvc-console.h>
+#include "xen-ops.h"
+#include "mmu.h"
+#include "smp.h"
+#include "pmu.h"
+
+cpumask_var_t xen_cpu_initialized_map;
+
+static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
+static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
+
+static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
+
+static void cpu_bringup(void)
+{
+ int cpu;
+
+ cpu_init();
+ touch_softlockup_watchdog();
+ preempt_disable();
+
+ /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
+ if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
+ xen_enable_sysenter();
+ xen_enable_syscall();
+ }
+ cpu = smp_processor_id();
+ smp_store_cpu_info(cpu);
+ cpu_data(cpu).x86_max_cores = 1;
+ set_cpu_sibling_map(cpu);
+
+ xen_setup_cpu_clockevents();
+
+ notify_cpu_starting(cpu);
+
+ set_cpu_online(cpu, true);
+
+ cpu_set_state_online(cpu); /* Implies full memory barrier. */
+
+ /* We can take interrupts now: we're officially "up". */
+ local_irq_enable();
+}
+
+asmlinkage __visible void cpu_bringup_and_idle(void)
+{
+ cpu_bringup();
+ cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
+}
+
+void xen_smp_intr_free_pv(unsigned int cpu)
+{
+ if (per_cpu(xen_irq_work, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
+ per_cpu(xen_irq_work, cpu).irq = -1;
+ kfree(per_cpu(xen_irq_work, cpu).name);
+ per_cpu(xen_irq_work, cpu).name = NULL;
+ }
+
+ if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
+ unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
+ per_cpu(xen_pmu_irq, cpu).irq = -1;
+ kfree(per_cpu(xen_pmu_irq, cpu).name);
+ per_cpu(xen_pmu_irq, cpu).name = NULL;
+ }
+}
+
+int xen_smp_intr_init_pv(unsigned int cpu)
+{
+ int rc;
+ char *callfunc_name, *pmu_name;
+
+ callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
+ rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
+ cpu,
+ xen_irq_work_interrupt,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ callfunc_name,
+ NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_irq_work, cpu).irq = rc;
+ per_cpu(xen_irq_work, cpu).name = callfunc_name;
+
+ if (is_xen_pmu(cpu)) {
+ pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
+ rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
+ xen_pmu_irq_handler,
+ IRQF_PERCPU|IRQF_NOBALANCING,
+ pmu_name, NULL);
+ if (rc < 0)
+ goto fail;
+ per_cpu(xen_pmu_irq, cpu).irq = rc;
+ per_cpu(xen_pmu_irq, cpu).name = pmu_name;
+ }
+
+ return 0;
+
+ fail:
+ xen_smp_intr_free_pv(cpu);
+ return rc;
+}
+
+static void __init xen_fill_possible_map(void)
+{
+ int i, rc;
+
+ if (xen_initial_domain())
+ return;
+
+ for (i = 0; i < nr_cpu_ids; i++) {
+ rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
+ if (rc >= 0) {
+ num_processors++;
+ set_cpu_possible(i, true);
+ }
+ }
+}
+
+static void __init xen_filter_cpu_maps(void)
+{
+ int i, rc;
+ unsigned int subtract = 0;
+
+ if (!xen_initial_domain())
+ return;
+
+ num_processors = 0;
+ disabled_cpus = 0;
+ for (i = 0; i < nr_cpu_ids; i++) {
+ rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
+ if (rc >= 0) {
+ num_processors++;
+ set_cpu_possible(i, true);
+ } else {
+ set_cpu_possible(i, false);
+ set_cpu_present(i, false);
+ subtract++;
+ }
+ }
+#ifdef CONFIG_HOTPLUG_CPU
+ /* This is akin to using 'nr_cpus' on the Linux command line.
+ * Which is OK as when we use 'dom0_max_vcpus=X' we can only
+ * have up to X, while nr_cpu_ids is greater than X. This
+ * normally is not a problem, except when CPU hotplugging
+ * is involved and then there might be more than X CPUs
+ * in the guest - which will not work as there is no
+ * hypercall to expand the max number of VCPUs an already
+ * running guest has. So cap it up to X. */
+ if (subtract)
+ nr_cpu_ids = nr_cpu_ids - subtract;
+#endif
+
+}
+
+static void __init xen_pv_smp_prepare_boot_cpu(void)
+{
+ BUG_ON(smp_processor_id() != 0);
+ native_smp_prepare_boot_cpu();
+
+ if (!xen_feature(XENFEAT_writable_page_tables))
+ /* We've switched to the "real" per-cpu gdt, so make
+ * sure the old memory can be recycled. */
+ make_lowmem_page_readwrite(xen_initial_gdt);
+
+#ifdef CONFIG_X86_32
+ /*
+ * Xen starts us with XEN_FLAT_RING1_DS, but linux code
+ * expects __USER_DS
+ */
+ loadsegment(ds, __USER_DS);
+ loadsegment(es, __USER_DS);
+#endif
+
+ xen_filter_cpu_maps();
+ xen_setup_vcpu_info_placement();
+
+ /*
+ * The alternative logic (which patches the unlock/lock) runs before
+ * the smp bootup up code is activated. Hence we need to set this up
+ * the core kernel is being patched. Otherwise we will have only
+ * modules patched but not core code.
+ */
+ xen_init_spinlocks();
+}
+
+static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
+{
+ unsigned cpu;
+ unsigned int i;
+
+ if (skip_ioapic_setup) {
+ char *m = (max_cpus == 0) ?
+ "The nosmp parameter is incompatible with Xen; " \
+ "use Xen dom0_max_vcpus=1 parameter" :
+ "The noapic parameter is incompatible with Xen";
+
+ xen_raw_printk(m);
+ panic(m);
+ }
+ xen_init_lock_cpu(0);
+
+ smp_store_boot_cpu_info();
+ cpu_data(0).x86_max_cores = 1;
+
+ for_each_possible_cpu(i) {
+ zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
+ zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
+ zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
+ }
+ set_cpu_sibling_map(0);
+
+ xen_pmu_init(0);
+
+ if (xen_smp_intr_init(0))
+ BUG();
+
+ if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
+ panic("could not allocate xen_cpu_initialized_map\n");
+
+ cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
+
+ /* Restrict the possible_map according to max_cpus. */
+ while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
+ for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
+ continue;
+ set_cpu_possible(cpu, false);
+ }
+
+ for_each_possible_cpu(cpu)
+ set_cpu_present(cpu, true);
+}
+
+static int
+cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
+{
+ struct vcpu_guest_context *ctxt;
+ struct desc_struct *gdt;
+ unsigned long gdt_mfn;
+
+ /* used to tell cpu_init() that it can proceed with initialization */
+ cpumask_set_cpu(cpu, cpu_callout_mask);
+ if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
+ return 0;
+
+ ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
+ if (ctxt == NULL)
+ return -ENOMEM;
+
+ gdt = get_cpu_gdt_table(cpu);
+
+#ifdef CONFIG_X86_32
+ ctxt->user_regs.fs = __KERNEL_PERCPU;
+ ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
+#endif
+ memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
+
+ ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
+ ctxt->flags = VGCF_IN_KERNEL;
+ ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
+ ctxt->user_regs.ds = __USER_DS;
+ ctxt->user_regs.es = __USER_DS;
+ ctxt->user_regs.ss = __KERNEL_DS;
+
+ xen_copy_trap_info(ctxt->trap_ctxt);
+
+ ctxt->ldt_ents = 0;
+
+ BUG_ON((unsigned long)gdt & ~PAGE_MASK);
+
+ gdt_mfn = arbitrary_virt_to_mfn(gdt);
+ make_lowmem_page_readonly(gdt);
+ make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
+
+ ctxt->gdt_frames[0] = gdt_mfn;
+ ctxt->gdt_ents = GDT_ENTRIES;
+
+ ctxt->kernel_ss = __KERNEL_DS;
+ ctxt->kernel_sp = idle->thread.sp0;
+
+#ifdef CONFIG_X86_32
+ ctxt->event_callback_cs = __KERNEL_CS;
+ ctxt->failsafe_callback_cs = __KERNEL_CS;
+#else
+ ctxt->gs_base_kernel = per_cpu_offset(cpu);
+#endif
+ ctxt->event_callback_eip =
+ (unsigned long)xen_hypervisor_callback;
+ ctxt->failsafe_callback_eip =
+ (unsigned long)xen_failsafe_callback;
+ ctxt->user_regs.cs = __KERNEL_CS;
+ per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
+
+ ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
+ ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
+ if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
+ BUG();
+
+ kfree(ctxt);
+ return 0;
+}
+
+static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
+{
+ int rc;
+
+ common_cpu_up(cpu, idle);
+
+ xen_setup_runstate_info(cpu);
+
+ /*
+ * PV VCPUs are always successfully taken down (see 'while' loop
+ * in xen_cpu_die()), so -EBUSY is an error.
+ */
+ rc = cpu_check_up_prepare(cpu);
+ if (rc)
+ return rc;
+
+ /* make sure interrupts start blocked */
+ per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
+
+ rc = cpu_initialize_context(cpu, idle);
+ if (rc)
+ return rc;
+
+ xen_pmu_init(cpu);
+
+ rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
+ BUG_ON(rc);
+
+ while (cpu_report_state(cpu) != CPU_ONLINE)
+ HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
+
+ return 0;
+}
+
+static void xen_smp_cpus_done(unsigned int max_cpus)
+{
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int xen_cpu_disable(void)
+{
+ unsigned int cpu = smp_processor_id();
+ if (cpu == 0)
+ return -EBUSY;
+
+ cpu_disable_common();
+
+ load_cr3(swapper_pg_dir);
+ return 0;
+}
+
+static void xen_pv_cpu_die(unsigned int cpu)
+{
+ while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
+ xen_vcpu_nr(cpu), NULL)) {
+ __set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(HZ/10);
+ }
+
+ if (common_cpu_die(cpu) == 0) {
+ xen_smp_intr_free(cpu);
+ xen_uninit_lock_cpu(cpu);
+ xen_teardown_timer(cpu);
+ xen_pmu_finish(cpu);
+ }
+}
+
+static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
+{
+ play_dead_common();
+ HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
+ cpu_bringup();
+ /*
+ * commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
+ * clears certain data that the cpu_idle loop (which called us
+ * and that we return from) expects. The only way to get that
+ * data back is to call:
+ */
+ tick_nohz_idle_enter();
+
+ cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
+}
+
+#else /* !CONFIG_HOTPLUG_CPU */
+static int xen_cpu_disable(void)
+{
+ return -ENOSYS;
+}
+
+static void xen_pv_cpu_die(unsigned int cpu)
+{
+ BUG();
+}
+
+static void xen_play_dead(void)
+{
+ BUG();
+}
+
+#endif
+static void stop_self(void *v)
+{
+ int cpu = smp_processor_id();
+
+ /* make sure we're not pinning something down */
+ load_cr3(swapper_pg_dir);
+ /* should set up a minimal gdt */
+
+ set_cpu_online(cpu, false);
+
+ HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
+ BUG();
+}
+
+static void xen_stop_other_cpus(int wait)
+{
+ smp_call_function(stop_self, NULL, wait);
+}
+
+static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
+{
+ irq_enter();
+ generic_smp_call_function_interrupt();
+ inc_irq_stat(irq_call_count);
+ irq_exit();
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
+{
+ irq_enter();
+ irq_work_run();
+ inc_irq_stat(apic_irq_work_irqs);
+ irq_exit();
+
+ return IRQ_HANDLED;
+}
+
+static const struct smp_ops xen_smp_ops __initconst = {
+ .smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
+ .smp_prepare_cpus = xen_smp_prepare_cpus,
+ .smp_cpus_done = xen_smp_cpus_done,
+
+ .cpu_up = xen_cpu_up,
+ .cpu_die = xen_pv_cpu_die,
+ .cpu_disable = xen_cpu_disable,
+ .play_dead = xen_play_dead,
+
+ .stop_other_cpus = xen_stop_other_cpus,
+ .smp_send_reschedule = xen_smp_send_reschedule,
+
+ .send_call_func_ipi = xen_smp_send_call_function_ipi,
+ .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
+};
+
+void __init xen_smp_init(void)
+{
+ smp_ops = xen_smp_ops;
+ xen_fill_possible_map();
+}
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 12/21] x86/xen: split off mmu_hvm.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (10 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 11/21] x86/xen: split off smp_pv.c Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:34 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 13/21] x86/xen: split off mmu_pv.c Vitaly Kuznetsov
` (9 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Move PVHVM related code to mmu_hvm.c.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Makefile | 2 +-
arch/x86/xen/mmu.c | 74 ----------------------------------------------
arch/x86/xen/mmu_hvm.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 80 insertions(+), 75 deletions(-)
create mode 100644 arch/x86/xen/mmu_hvm.c
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index ebf3522..6a95a8b 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -15,7 +15,7 @@ obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
grant-table.o suspend.o platform-pci-unplug.o \
p2m.o apic.o pmu.o enlighten_pv.o
-obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o
+obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o mmu_hvm.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index f6740b5..4dfcb06 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2689,80 +2689,6 @@ void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
}
EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
-#ifdef CONFIG_XEN_PVHVM
-#ifdef CONFIG_PROC_VMCORE
-/*
- * This function is used in two contexts:
- * - the kdump kernel has to check whether a pfn of the crashed kernel
- * was a ballooned page. vmcore is using this function to decide
- * whether to access a pfn of the crashed kernel.
- * - the kexec kernel has to check whether a pfn was ballooned by the
- * previous kernel. If the pfn is ballooned, handle it properly.
- * Returns 0 if the pfn is not backed by a RAM page, the caller may
- * handle the pfn special in this case.
- */
-static int xen_oldmem_pfn_is_ram(unsigned long pfn)
-{
- struct xen_hvm_get_mem_type a = {
- .domid = DOMID_SELF,
- .pfn = pfn,
- };
- int ram;
-
- if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
- return -ENXIO;
-
- switch (a.mem_type) {
- case HVMMEM_mmio_dm:
- ram = 0;
- break;
- case HVMMEM_ram_rw:
- case HVMMEM_ram_ro:
- default:
- ram = 1;
- break;
- }
-
- return ram;
-}
-#endif
-
-static void xen_hvm_exit_mmap(struct mm_struct *mm)
-{
- struct xen_hvm_pagetable_dying a;
- int rc;
-
- a.domid = DOMID_SELF;
- a.gpa = __pa(mm->pgd);
- rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
- WARN_ON_ONCE(rc < 0);
-}
-
-static int is_pagetable_dying_supported(void)
-{
- struct xen_hvm_pagetable_dying a;
- int rc = 0;
-
- a.domid = DOMID_SELF;
- a.gpa = 0x00;
- rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
- if (rc < 0) {
- printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
- return 0;
- }
- return 1;
-}
-
-void __init xen_hvm_init_mmu_ops(void)
-{
- if (is_pagetable_dying_supported())
- pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
-#ifdef CONFIG_PROC_VMCORE
- register_oldmem_pfn_is_ram(&xen_oldmem_pfn_is_ram);
-#endif
-}
-#endif
-
#define REMAP_BATCH_SIZE 16
struct remap_data {
diff --git a/arch/x86/xen/mmu_hvm.c b/arch/x86/xen/mmu_hvm.c
new file mode 100644
index 0000000..1c57f1c
--- /dev/null
+++ b/arch/x86/xen/mmu_hvm.c
@@ -0,0 +1,79 @@
+#include <linux/types.h>
+#include <linux/crash_dump.h>
+
+#include <xen/interface/xen.h>
+#include <xen/hvm.h>
+
+#include "mmu.h"
+
+#ifdef CONFIG_PROC_VMCORE
+/*
+ * This function is used in two contexts:
+ * - the kdump kernel has to check whether a pfn of the crashed kernel
+ * was a ballooned page. vmcore is using this function to decide
+ * whether to access a pfn of the crashed kernel.
+ * - the kexec kernel has to check whether a pfn was ballooned by the
+ * previous kernel. If the pfn is ballooned, handle it properly.
+ * Returns 0 if the pfn is not backed by a RAM page, the caller may
+ * handle the pfn special in this case.
+ */
+static int xen_oldmem_pfn_is_ram(unsigned long pfn)
+{
+ struct xen_hvm_get_mem_type a = {
+ .domid = DOMID_SELF,
+ .pfn = pfn,
+ };
+ int ram;
+
+ if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
+ return -ENXIO;
+
+ switch (a.mem_type) {
+ case HVMMEM_mmio_dm:
+ ram = 0;
+ break;
+ case HVMMEM_ram_rw:
+ case HVMMEM_ram_ro:
+ default:
+ ram = 1;
+ break;
+ }
+
+ return ram;
+}
+#endif
+
+static void xen_hvm_exit_mmap(struct mm_struct *mm)
+{
+ struct xen_hvm_pagetable_dying a;
+ int rc;
+
+ a.domid = DOMID_SELF;
+ a.gpa = __pa(mm->pgd);
+ rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
+ WARN_ON_ONCE(rc < 0);
+}
+
+static int is_pagetable_dying_supported(void)
+{
+ struct xen_hvm_pagetable_dying a;
+ int rc = 0;
+
+ a.domid = DOMID_SELF;
+ a.gpa = 0x00;
+ rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
+ if (rc < 0) {
+ printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
+ return 0;
+ }
+ return 1;
+}
+
+void __init xen_hvm_init_mmu_ops(void)
+{
+ if (is_pagetable_dying_supported())
+ pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
+#ifdef CONFIG_PROC_VMCORE
+ register_oldmem_pfn_is_ram(&xen_oldmem_pfn_is_ram);
+#endif
+}
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 13/21] x86/xen: split off mmu_pv.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (11 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 12/21] x86/xen: split off mmu_hvm.c Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:35 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 14/21] x86/xen: split suspend.c for PV and PVHVM guests Vitaly Kuznetsov
` (8 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Basically, mmu.c is renamed to mmu_pv.c and some code moved out to common
mmu.c.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Makefile | 4 +-
arch/x86/xen/mmu.c | 2702 +------------------------------------------------
arch/x86/xen/mmu_pv.c | 2635 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 2674 insertions(+), 2667 deletions(-)
create mode 100644 arch/x86/xen/mmu_pv.c
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 6a95a8b..8da1ca9 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -8,12 +8,12 @@ endif
# Make sure early boot has no stackprotector
nostackp := $(call cc-option, -fno-stack-protector)
CFLAGS_enlighten_pv.o := $(nostackp)
-CFLAGS_mmu.o := $(nostackp)
+CFLAGS_mmu_pv.o := $(nostackp)
obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
time.o xen-asm.o xen-asm_$(BITS).o \
grant-table.o suspend.o platform-pci-unplug.o \
- p2m.o apic.o pmu.o enlighten_pv.o
+ p2m.o apic.o pmu.o enlighten_pv.o mmu_pv.o
obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o mmu_hvm.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 4dfcb06..5e375a5 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1,2693 +1,66 @@
-/*
- * Xen mmu operations
- *
- * This file contains the various mmu fetch and update operations.
- * The most important job they must perform is the mapping between the
- * domain's pfn and the overall machine mfns.
- *
- * Xen allows guests to directly update the pagetable, in a controlled
- * fashion. In other words, the guest modifies the same pagetable
- * that the CPU actually uses, which eliminates the overhead of having
- * a separate shadow pagetable.
- *
- * In order to allow this, it falls on the guest domain to map its
- * notion of a "physical" pfn - which is just a domain-local linear
- * address - into a real "machine address" which the CPU's MMU can
- * use.
- *
- * A pgd_t/pmd_t/pte_t will typically contain an mfn, and so can be
- * inserted directly into the pagetable. When creating a new
- * pte/pmd/pgd, it converts the passed pfn into an mfn. Conversely,
- * when reading the content back with __(pgd|pmd|pte)_val, it converts
- * the mfn back into a pfn.
- *
- * The other constraint is that all pages which make up a pagetable
- * must be mapped read-only in the guest. This prevents uncontrolled
- * guest updates to the pagetable. Xen strictly enforces this, and
- * will disallow any pagetable update which will end up mapping a
- * pagetable page RW, and will disallow using any writable page as a
- * pagetable.
- *
- * Naively, when loading %cr3 with the base of a new pagetable, Xen
- * would need to validate the whole pagetable before going on.
- * Naturally, this is quite slow. The solution is to "pin" a
- * pagetable, which enforces all the constraints on the pagetable even
- * when it is not actively in use. This menas that Xen can be assured
- * that it is still valid when you do load it into %cr3, and doesn't
- * need to revalidate it.
- *
- * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
- */
-#include <linux/sched.h>
-#include <linux/highmem.h>
-#include <linux/debugfs.h>
-#include <linux/bug.h>
-#include <linux/vmalloc.h>
-#include <linux/export.h>
-#include <linux/init.h>
-#include <linux/gfp.h>
-#include <linux/memblock.h>
-#include <linux/seq_file.h>
-#include <linux/crash_dump.h>
-
-#include <trace/events/xen.h>
-
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-#include <asm/fixmap.h>
-#include <asm/mmu_context.h>
-#include <asm/setup.h>
-#include <asm/paravirt.h>
-#include <asm/e820.h>
-#include <asm/linkage.h>
-#include <asm/page.h>
-#include <asm/init.h>
-#include <asm/pat.h>
-#include <asm/smp.h>
-
-#include <asm/xen/hypercall.h>
-#include <asm/xen/hypervisor.h>
-
-#include <xen/xen.h>
-#include <xen/page.h>
-#include <xen/interface/xen.h>
-#include <xen/interface/hvm/hvm_op.h>
-#include <xen/interface/version.h>
-#include <xen/interface/memory.h>
-#include <xen/hvc-console.h>
-
-#include "multicalls.h"
-#include "mmu.h"
-#include "debugfs.h"
-
-/*
- * Protects atomic reservation decrease/increase against concurrent increases.
- * Also protects non-atomic updates of current_pages and balloon lists.
- */
-DEFINE_SPINLOCK(xen_reservation_lock);
-
-#ifdef CONFIG_X86_32
-/*
- * Identity map, in addition to plain kernel map. This needs to be
- * large enough to allocate page table pages to allocate the rest.
- * Each page can map 2MB.
- */
-#define LEVEL1_IDENT_ENTRIES (PTRS_PER_PTE * 4)
-static RESERVE_BRK_ARRAY(pte_t, level1_ident_pgt, LEVEL1_IDENT_ENTRIES);
-#endif
-#ifdef CONFIG_X86_64
-/* l3 pud for userspace vsyscall mapping */
-static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
-#endif /* CONFIG_X86_64 */
-
-/*
- * Note about cr3 (pagetable base) values:
- *
- * xen_cr3 contains the current logical cr3 value; it contains the
- * last set cr3. This may not be the current effective cr3, because
- * its update may be being lazily deferred. However, a vcpu looking
- * at its own cr3 can use this value knowing that it everything will
- * be self-consistent.
- *
- * xen_current_cr3 contains the actual vcpu cr3; it is set once the
- * hypercall to set the vcpu cr3 is complete (so it may be a little
- * out of date, but it will never be set early). If one vcpu is
- * looking at another vcpu's cr3 value, it should use this variable.
- */
-DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
-DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
-
-static phys_addr_t xen_pt_base, xen_pt_size __initdata;
-
-/*
- * Just beyond the highest usermode address. STACK_TOP_MAX has a
- * redzone above it, so round it up to a PGD boundary.
- */
-#define USER_LIMIT ((STACK_TOP_MAX + PGDIR_SIZE - 1) & PGDIR_MASK)
-
-unsigned long arbitrary_virt_to_mfn(void *vaddr)
-{
- xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
-
- return PFN_DOWN(maddr.maddr);
-}
-
-xmaddr_t arbitrary_virt_to_machine(void *vaddr)
-{
- unsigned long address = (unsigned long)vaddr;
- unsigned int level;
- pte_t *pte;
- unsigned offset;
-
- /*
- * if the PFN is in the linear mapped vaddr range, we can just use
- * the (quick) virt_to_machine() p2m lookup
- */
- if (virt_addr_valid(vaddr))
- return virt_to_machine(vaddr);
-
- /* otherwise we have to do a (slower) full page-table walk */
-
- pte = lookup_address(address, &level);
- BUG_ON(pte == NULL);
- offset = address & ~PAGE_MASK;
- return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
-}
-EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
-
-void make_lowmem_page_readonly(void *vaddr)
-{
- pte_t *pte, ptev;
- unsigned long address = (unsigned long)vaddr;
- unsigned int level;
-
- pte = lookup_address(address, &level);
- if (pte == NULL)
- return; /* vaddr missing */
-
- ptev = pte_wrprotect(*pte);
-
- if (HYPERVISOR_update_va_mapping(address, ptev, 0))
- BUG();
-}
-
-void make_lowmem_page_readwrite(void *vaddr)
-{
- pte_t *pte, ptev;
- unsigned long address = (unsigned long)vaddr;
- unsigned int level;
-
- pte = lookup_address(address, &level);
- if (pte == NULL)
- return; /* vaddr missing */
-
- ptev = pte_mkwrite(*pte);
-
- if (HYPERVISOR_update_va_mapping(address, ptev, 0))
- BUG();
-}
-
-
-static bool xen_page_pinned(void *ptr)
-{
- struct page *page = virt_to_page(ptr);
-
- return PagePinned(page);
-}
-
-void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
-{
- struct multicall_space mcs;
- struct mmu_update *u;
-
- trace_xen_mmu_set_domain_pte(ptep, pteval, domid);
-
- mcs = xen_mc_entry(sizeof(*u));
- u = mcs.args;
-
- /* ptep might be kmapped when using 32-bit HIGHPTE */
- u->ptr = virt_to_machine(ptep).maddr;
- u->val = pte_val_ma(pteval);
-
- MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-}
-EXPORT_SYMBOL_GPL(xen_set_domain_pte);
-
-static void xen_extend_mmu_update(const struct mmu_update *update)
-{
- struct multicall_space mcs;
- struct mmu_update *u;
-
- mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
-
- if (mcs.mc != NULL) {
- mcs.mc->args[1]++;
- } else {
- mcs = __xen_mc_entry(sizeof(*u));
- MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
- }
-
- u = mcs.args;
- *u = *update;
-}
-
-static void xen_extend_mmuext_op(const struct mmuext_op *op)
-{
- struct multicall_space mcs;
- struct mmuext_op *u;
-
- mcs = xen_mc_extend_args(__HYPERVISOR_mmuext_op, sizeof(*u));
-
- if (mcs.mc != NULL) {
- mcs.mc->args[1]++;
- } else {
- mcs = __xen_mc_entry(sizeof(*u));
- MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
- }
-
- u = mcs.args;
- *u = *op;
-}
-
-static void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
-{
- struct mmu_update u;
-
- preempt_disable();
-
- xen_mc_batch();
-
- /* ptr may be ioremapped for 64-bit pagetable setup */
- u.ptr = arbitrary_virt_to_machine(ptr).maddr;
- u.val = pmd_val_ma(val);
- xen_extend_mmu_update(&u);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-
- preempt_enable();
-}
-
-static void xen_set_pmd(pmd_t *ptr, pmd_t val)
-{
- trace_xen_mmu_set_pmd(ptr, val);
-
- /* If page is not pinned, we can just update the entry
- directly */
- if (!xen_page_pinned(ptr)) {
- *ptr = val;
- return;
- }
-
- xen_set_pmd_hyper(ptr, val);
-}
-
-/*
- * Associate a virtual page frame with a given physical page frame
- * and protection flags for that frame.
- */
-void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
-{
- set_pte_vaddr(vaddr, mfn_pte(mfn, flags));
-}
-
-static bool xen_batched_set_pte(pte_t *ptep, pte_t pteval)
-{
- struct mmu_update u;
-
- if (paravirt_get_lazy_mode() != PARAVIRT_LAZY_MMU)
- return false;
-
- xen_mc_batch();
-
- u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
- u.val = pte_val_ma(pteval);
- xen_extend_mmu_update(&u);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-
- return true;
-}
-
-static inline void __xen_set_pte(pte_t *ptep, pte_t pteval)
-{
- if (!xen_batched_set_pte(ptep, pteval)) {
- /*
- * Could call native_set_pte() here and trap and
- * emulate the PTE write but with 32-bit guests this
- * needs two traps (one for each of the two 32-bit
- * words in the PTE) so do one hypercall directly
- * instead.
- */
- struct mmu_update u;
-
- u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
- u.val = pte_val_ma(pteval);
- HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF);
- }
-}
-
-static void xen_set_pte(pte_t *ptep, pte_t pteval)
-{
- trace_xen_mmu_set_pte(ptep, pteval);
- __xen_set_pte(ptep, pteval);
-}
-
-static void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep, pte_t pteval)
-{
- trace_xen_mmu_set_pte_at(mm, addr, ptep, pteval);
- __xen_set_pte(ptep, pteval);
-}
-
-pte_t xen_ptep_modify_prot_start(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep)
-{
- /* Just return the pte as-is. We preserve the bits on commit */
- trace_xen_mmu_ptep_modify_prot_start(mm, addr, ptep, *ptep);
- return *ptep;
-}
-
-void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep, pte_t pte)
-{
- struct mmu_update u;
-
- trace_xen_mmu_ptep_modify_prot_commit(mm, addr, ptep, pte);
- xen_mc_batch();
-
- u.ptr = virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD;
- u.val = pte_val_ma(pte);
- xen_extend_mmu_update(&u);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-}
-
-/* Assume pteval_t is equivalent to all the other *val_t types. */
-static pteval_t pte_mfn_to_pfn(pteval_t val)
-{
- if (val & _PAGE_PRESENT) {
- unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
- unsigned long pfn = mfn_to_pfn(mfn);
-
- pteval_t flags = val & PTE_FLAGS_MASK;
- if (unlikely(pfn == ~0))
- val = flags & ~_PAGE_PRESENT;
- else
- val = ((pteval_t)pfn << PAGE_SHIFT) | flags;
- }
-
- return val;
-}
-
-static pteval_t pte_pfn_to_mfn(pteval_t val)
-{
- if (val & _PAGE_PRESENT) {
- unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
- pteval_t flags = val & PTE_FLAGS_MASK;
- unsigned long mfn;
-
- if (!xen_feature(XENFEAT_auto_translated_physmap))
- mfn = __pfn_to_mfn(pfn);
- else
- mfn = pfn;
- /*
- * If there's no mfn for the pfn, then just create an
- * empty non-present pte. Unfortunately this loses
- * information about the original pfn, so
- * pte_mfn_to_pfn is asymmetric.
- */
- if (unlikely(mfn == INVALID_P2M_ENTRY)) {
- mfn = 0;
- flags = 0;
- } else
- mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
- val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
- }
-
- return val;
-}
-
-__visible pteval_t xen_pte_val(pte_t pte)
-{
- pteval_t pteval = pte.pte;
-
- return pte_mfn_to_pfn(pteval);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
-
-__visible pgdval_t xen_pgd_val(pgd_t pgd)
-{
- return pte_mfn_to_pfn(pgd.pgd);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
-
-__visible pte_t xen_make_pte(pteval_t pte)
-{
- pte = pte_pfn_to_mfn(pte);
-
- return native_make_pte(pte);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
-
-__visible pgd_t xen_make_pgd(pgdval_t pgd)
-{
- pgd = pte_pfn_to_mfn(pgd);
- return native_make_pgd(pgd);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_make_pgd);
-
-__visible pmdval_t xen_pmd_val(pmd_t pmd)
-{
- return pte_mfn_to_pfn(pmd.pmd);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_pmd_val);
-
-static void xen_set_pud_hyper(pud_t *ptr, pud_t val)
-{
- struct mmu_update u;
-
- preempt_disable();
-
- xen_mc_batch();
-
- /* ptr may be ioremapped for 64-bit pagetable setup */
- u.ptr = arbitrary_virt_to_machine(ptr).maddr;
- u.val = pud_val_ma(val);
- xen_extend_mmu_update(&u);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-
- preempt_enable();
-}
-
-static void xen_set_pud(pud_t *ptr, pud_t val)
-{
- trace_xen_mmu_set_pud(ptr, val);
-
- /* If page is not pinned, we can just update the entry
- directly */
- if (!xen_page_pinned(ptr)) {
- *ptr = val;
- return;
- }
-
- xen_set_pud_hyper(ptr, val);
-}
-
-#ifdef CONFIG_X86_PAE
-static void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
-{
- trace_xen_mmu_set_pte_atomic(ptep, pte);
- set_64bit((u64 *)ptep, native_pte_val(pte));
-}
-
-static void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
-{
- trace_xen_mmu_pte_clear(mm, addr, ptep);
- if (!xen_batched_set_pte(ptep, native_make_pte(0)))
- native_pte_clear(mm, addr, ptep);
-}
-
-static void xen_pmd_clear(pmd_t *pmdp)
-{
- trace_xen_mmu_pmd_clear(pmdp);
- set_pmd(pmdp, __pmd(0));
-}
-#endif /* CONFIG_X86_PAE */
-
-__visible pmd_t xen_make_pmd(pmdval_t pmd)
-{
- pmd = pte_pfn_to_mfn(pmd);
- return native_make_pmd(pmd);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_make_pmd);
-
-#if CONFIG_PGTABLE_LEVELS == 4
-__visible pudval_t xen_pud_val(pud_t pud)
-{
- return pte_mfn_to_pfn(pud.pud);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_pud_val);
-
-__visible pud_t xen_make_pud(pudval_t pud)
-{
- pud = pte_pfn_to_mfn(pud);
-
- return native_make_pud(pud);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_make_pud);
-
-static pgd_t *xen_get_user_pgd(pgd_t *pgd)
-{
- pgd_t *pgd_page = (pgd_t *)(((unsigned long)pgd) & PAGE_MASK);
- unsigned offset = pgd - pgd_page;
- pgd_t *user_ptr = NULL;
-
- if (offset < pgd_index(USER_LIMIT)) {
- struct page *page = virt_to_page(pgd_page);
- user_ptr = (pgd_t *)page->private;
- if (user_ptr)
- user_ptr += offset;
- }
-
- return user_ptr;
-}
-
-static void __xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
-{
- struct mmu_update u;
-
- u.ptr = virt_to_machine(ptr).maddr;
- u.val = pgd_val_ma(val);
- xen_extend_mmu_update(&u);
-}
-
-/*
- * Raw hypercall-based set_pgd, intended for in early boot before
- * there's a page structure. This implies:
- * 1. The only existing pagetable is the kernel's
- * 2. It is always pinned
- * 3. It has no user pagetable attached to it
- */
-static void __init xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
-{
- preempt_disable();
-
- xen_mc_batch();
-
- __xen_set_pgd_hyper(ptr, val);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-
- preempt_enable();
-}
-
-static void xen_set_pgd(pgd_t *ptr, pgd_t val)
-{
- pgd_t *user_ptr = xen_get_user_pgd(ptr);
-
- trace_xen_mmu_set_pgd(ptr, user_ptr, val);
-
- /* If page is not pinned, we can just update the entry
- directly */
- if (!xen_page_pinned(ptr)) {
- *ptr = val;
- if (user_ptr) {
- WARN_ON(xen_page_pinned(user_ptr));
- *user_ptr = val;
- }
- return;
- }
-
- /* If it's pinned, then we can at least batch the kernel and
- user updates together. */
- xen_mc_batch();
-
- __xen_set_pgd_hyper(ptr, val);
- if (user_ptr)
- __xen_set_pgd_hyper(user_ptr, val);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-}
-#endif /* CONFIG_PGTABLE_LEVELS == 4 */
-
-/*
- * (Yet another) pagetable walker. This one is intended for pinning a
- * pagetable. This means that it walks a pagetable and calls the
- * callback function on each page it finds making up the page table,
- * at every level. It walks the entire pagetable, but it only bothers
- * pinning pte pages which are below limit. In the normal case this
- * will be STACK_TOP_MAX, but at boot we need to pin up to
- * FIXADDR_TOP.
- *
- * For 32-bit the important bit is that we don't pin beyond there,
- * because then we start getting into Xen's ptes.
- *
- * For 64-bit, we must skip the Xen hole in the middle of the address
- * space, just after the big x86-64 virtual hole.
- */
-static int __xen_pgd_walk(struct mm_struct *mm, pgd_t *pgd,
- int (*func)(struct mm_struct *mm, struct page *,
- enum pt_level),
- unsigned long limit)
-{
- int flush = 0;
- unsigned hole_low, hole_high;
- unsigned pgdidx_limit, pudidx_limit, pmdidx_limit;
- unsigned pgdidx, pudidx, pmdidx;
-
- /* The limit is the last byte to be touched */
- limit--;
- BUG_ON(limit >= FIXADDR_TOP);
-
- if (xen_feature(XENFEAT_auto_translated_physmap))
- return 0;
-
- /*
- * 64-bit has a great big hole in the middle of the address
- * space, which contains the Xen mappings. On 32-bit these
- * will end up making a zero-sized hole and so is a no-op.
- */
- hole_low = pgd_index(USER_LIMIT);
- hole_high = pgd_index(PAGE_OFFSET);
-
- pgdidx_limit = pgd_index(limit);
-#if PTRS_PER_PUD > 1
- pudidx_limit = pud_index(limit);
-#else
- pudidx_limit = 0;
-#endif
-#if PTRS_PER_PMD > 1
- pmdidx_limit = pmd_index(limit);
-#else
- pmdidx_limit = 0;
-#endif
-
- for (pgdidx = 0; pgdidx <= pgdidx_limit; pgdidx++) {
- pud_t *pud;
-
- if (pgdidx >= hole_low && pgdidx < hole_high)
- continue;
-
- if (!pgd_val(pgd[pgdidx]))
- continue;
-
- pud = pud_offset(&pgd[pgdidx], 0);
-
- if (PTRS_PER_PUD > 1) /* not folded */
- flush |= (*func)(mm, virt_to_page(pud), PT_PUD);
-
- for (pudidx = 0; pudidx < PTRS_PER_PUD; pudidx++) {
- pmd_t *pmd;
-
- if (pgdidx == pgdidx_limit &&
- pudidx > pudidx_limit)
- goto out;
-
- if (pud_none(pud[pudidx]))
- continue;
-
- pmd = pmd_offset(&pud[pudidx], 0);
-
- if (PTRS_PER_PMD > 1) /* not folded */
- flush |= (*func)(mm, virt_to_page(pmd), PT_PMD);
-
- for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++) {
- struct page *pte;
-
- if (pgdidx == pgdidx_limit &&
- pudidx == pudidx_limit &&
- pmdidx > pmdidx_limit)
- goto out;
-
- if (pmd_none(pmd[pmdidx]))
- continue;
-
- pte = pmd_page(pmd[pmdidx]);
- flush |= (*func)(mm, pte, PT_PTE);
- }
- }
- }
-
-out:
- /* Do the top level last, so that the callbacks can use it as
- a cue to do final things like tlb flushes. */
- flush |= (*func)(mm, virt_to_page(pgd), PT_PGD);
-
- return flush;
-}
-
-static int xen_pgd_walk(struct mm_struct *mm,
- int (*func)(struct mm_struct *mm, struct page *,
- enum pt_level),
- unsigned long limit)
-{
- return __xen_pgd_walk(mm, mm->pgd, func, limit);
-}
-
-/* If we're using split pte locks, then take the page's lock and
- return a pointer to it. Otherwise return NULL. */
-static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
-{
- spinlock_t *ptl = NULL;
-
-#if USE_SPLIT_PTE_PTLOCKS
- ptl = ptlock_ptr(page);
- spin_lock_nest_lock(ptl, &mm->page_table_lock);
-#endif
-
- return ptl;
-}
-
-static void xen_pte_unlock(void *v)
-{
- spinlock_t *ptl = v;
- spin_unlock(ptl);
-}
-
-static void xen_do_pin(unsigned level, unsigned long pfn)
-{
- struct mmuext_op op;
-
- op.cmd = level;
- op.arg1.mfn = pfn_to_mfn(pfn);
-
- xen_extend_mmuext_op(&op);
-}
-
-static int xen_pin_page(struct mm_struct *mm, struct page *page,
- enum pt_level level)
-{
- unsigned pgfl = TestSetPagePinned(page);
- int flush;
-
- if (pgfl)
- flush = 0; /* already pinned */
- else if (PageHighMem(page))
- /* kmaps need flushing if we found an unpinned
- highpage */
- flush = 1;
- else {
- void *pt = lowmem_page_address(page);
- unsigned long pfn = page_to_pfn(page);
- struct multicall_space mcs = __xen_mc_entry(0);
- spinlock_t *ptl;
-
- flush = 0;
-
- /*
- * We need to hold the pagetable lock between the time
- * we make the pagetable RO and when we actually pin
- * it. If we don't, then other users may come in and
- * attempt to update the pagetable by writing it,
- * which will fail because the memory is RO but not
- * pinned, so Xen won't do the trap'n'emulate.
- *
- * If we're using split pte locks, we can't hold the
- * entire pagetable's worth of locks during the
- * traverse, because we may wrap the preempt count (8
- * bits). The solution is to mark RO and pin each PTE
- * page while holding the lock. This means the number
- * of locks we end up holding is never more than a
- * batch size (~32 entries, at present).
- *
- * If we're not using split pte locks, we needn't pin
- * the PTE pages independently, because we're
- * protected by the overall pagetable lock.
- */
- ptl = NULL;
- if (level == PT_PTE)
- ptl = xen_pte_lock(page, mm);
-
- MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
- pfn_pte(pfn, PAGE_KERNEL_RO),
- level == PT_PGD ? UVMF_TLB_FLUSH : 0);
-
- if (ptl) {
- xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn);
-
- /* Queue a deferred unlock for when this batch
- is completed. */
- xen_mc_callback(xen_pte_unlock, ptl);
- }
- }
-
- return flush;
-}
-
-/* This is called just after a mm has been created, but it has not
- been used yet. We need to make sure that its pagetable is all
- read-only, and can be pinned. */
-static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
-{
- trace_xen_mmu_pgd_pin(mm, pgd);
-
- xen_mc_batch();
-
- if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
- /* re-enable interrupts for flushing */
- xen_mc_issue(0);
-
- kmap_flush_unused();
-
- xen_mc_batch();
- }
-
-#ifdef CONFIG_X86_64
- {
- pgd_t *user_pgd = xen_get_user_pgd(pgd);
-
- xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(pgd)));
-
- if (user_pgd) {
- xen_pin_page(mm, virt_to_page(user_pgd), PT_PGD);
- xen_do_pin(MMUEXT_PIN_L4_TABLE,
- PFN_DOWN(__pa(user_pgd)));
- }
- }
-#else /* CONFIG_X86_32 */
-#ifdef CONFIG_X86_PAE
- /* Need to make sure unshared kernel PMD is pinnable */
- xen_pin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
- PT_PMD);
-#endif
- xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
-#endif /* CONFIG_X86_64 */
- xen_mc_issue(0);
-}
-
-static void xen_pgd_pin(struct mm_struct *mm)
-{
- __xen_pgd_pin(mm, mm->pgd);
-}
-
-/*
- * On save, we need to pin all pagetables to make sure they get their
- * mfns turned into pfns. Search the list for any unpinned pgds and pin
- * them (unpinned pgds are not currently in use, probably because the
- * process is under construction or destruction).
- *
- * Expected to be called in stop_machine() ("equivalent to taking
- * every spinlock in the system"), so the locking doesn't really
- * matter all that much.
- */
-void xen_mm_pin_all(void)
-{
- struct page *page;
-
- spin_lock(&pgd_lock);
-
- list_for_each_entry(page, &pgd_list, lru) {
- if (!PagePinned(page)) {
- __xen_pgd_pin(&init_mm, (pgd_t *)page_address(page));
- SetPageSavePinned(page);
- }
- }
-
- spin_unlock(&pgd_lock);
-}
-
-/*
- * The init_mm pagetable is really pinned as soon as its created, but
- * that's before we have page structures to store the bits. So do all
- * the book-keeping now.
- */
-static int __init xen_mark_pinned(struct mm_struct *mm, struct page *page,
- enum pt_level level)
-{
- SetPagePinned(page);
- return 0;
-}
-
-static void __init xen_mark_init_mm_pinned(void)
-{
- xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
-}
-
-static int xen_unpin_page(struct mm_struct *mm, struct page *page,
- enum pt_level level)
-{
- unsigned pgfl = TestClearPagePinned(page);
-
- if (pgfl && !PageHighMem(page)) {
- void *pt = lowmem_page_address(page);
- unsigned long pfn = page_to_pfn(page);
- spinlock_t *ptl = NULL;
- struct multicall_space mcs;
-
- /*
- * Do the converse to pin_page. If we're using split
- * pte locks, we must be holding the lock for while
- * the pte page is unpinned but still RO to prevent
- * concurrent updates from seeing it in this
- * partially-pinned state.
- */
- if (level == PT_PTE) {
- ptl = xen_pte_lock(page, mm);
-
- if (ptl)
- xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
- }
-
- mcs = __xen_mc_entry(0);
-
- MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
- pfn_pte(pfn, PAGE_KERNEL),
- level == PT_PGD ? UVMF_TLB_FLUSH : 0);
-
- if (ptl) {
- /* unlock when batch completed */
- xen_mc_callback(xen_pte_unlock, ptl);
- }
- }
-
- return 0; /* never need to flush on unpin */
-}
-
-/* Release a pagetables pages back as normal RW */
-static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
-{
- trace_xen_mmu_pgd_unpin(mm, pgd);
-
- xen_mc_batch();
-
- xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
-
-#ifdef CONFIG_X86_64
- {
- pgd_t *user_pgd = xen_get_user_pgd(pgd);
-
- if (user_pgd) {
- xen_do_pin(MMUEXT_UNPIN_TABLE,
- PFN_DOWN(__pa(user_pgd)));
- xen_unpin_page(mm, virt_to_page(user_pgd), PT_PGD);
- }
- }
-#endif
-
-#ifdef CONFIG_X86_PAE
- /* Need to make sure unshared kernel PMD is unpinned */
- xen_unpin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
- PT_PMD);
-#endif
-
- __xen_pgd_walk(mm, pgd, xen_unpin_page, USER_LIMIT);
-
- xen_mc_issue(0);
-}
-
-static void xen_pgd_unpin(struct mm_struct *mm)
-{
- __xen_pgd_unpin(mm, mm->pgd);
-}
-
-/*
- * On resume, undo any pinning done at save, so that the rest of the
- * kernel doesn't see any unexpected pinned pagetables.
- */
-void xen_mm_unpin_all(void)
-{
- struct page *page;
-
- spin_lock(&pgd_lock);
-
- list_for_each_entry(page, &pgd_list, lru) {
- if (PageSavePinned(page)) {
- BUG_ON(!PagePinned(page));
- __xen_pgd_unpin(&init_mm, (pgd_t *)page_address(page));
- ClearPageSavePinned(page);
- }
- }
-
- spin_unlock(&pgd_lock);
-}
-
-static void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
- spin_lock(&next->page_table_lock);
- xen_pgd_pin(next);
- spin_unlock(&next->page_table_lock);
-}
-
-static void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
-{
- spin_lock(&mm->page_table_lock);
- xen_pgd_pin(mm);
- spin_unlock(&mm->page_table_lock);
-}
-
-
-#ifdef CONFIG_SMP
-/* Another cpu may still have their %cr3 pointing at the pagetable, so
- we need to repoint it somewhere else before we can unpin it. */
-static void drop_other_mm_ref(void *info)
-{
- struct mm_struct *mm = info;
- struct mm_struct *active_mm;
-
- active_mm = this_cpu_read(cpu_tlbstate.active_mm);
-
- if (active_mm == mm && this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
- leave_mm(smp_processor_id());
-
- /* If this cpu still has a stale cr3 reference, then make sure
- it has been flushed. */
- if (this_cpu_read(xen_current_cr3) == __pa(mm->pgd))
- load_cr3(swapper_pg_dir);
-}
-
-static void xen_drop_mm_ref(struct mm_struct *mm)
-{
- cpumask_var_t mask;
- unsigned cpu;
-
- if (current->active_mm == mm) {
- if (current->mm == mm)
- load_cr3(swapper_pg_dir);
- else
- leave_mm(smp_processor_id());
- }
-
- /* Get the "official" set of cpus referring to our pagetable. */
- if (!alloc_cpumask_var(&mask, GFP_ATOMIC)) {
- for_each_online_cpu(cpu) {
- if (!cpumask_test_cpu(cpu, mm_cpumask(mm))
- && per_cpu(xen_current_cr3, cpu) != __pa(mm->pgd))
- continue;
- smp_call_function_single(cpu, drop_other_mm_ref, mm, 1);
- }
- return;
- }
- cpumask_copy(mask, mm_cpumask(mm));
-
- /* It's possible that a vcpu may have a stale reference to our
- cr3, because its in lazy mode, and it hasn't yet flushed
- its set of pending hypercalls yet. In this case, we can
- look at its actual current cr3 value, and force it to flush
- if needed. */
- for_each_online_cpu(cpu) {
- if (per_cpu(xen_current_cr3, cpu) == __pa(mm->pgd))
- cpumask_set_cpu(cpu, mask);
- }
-
- if (!cpumask_empty(mask))
- smp_call_function_many(mask, drop_other_mm_ref, mm, 1);
- free_cpumask_var(mask);
-}
-#else
-static void xen_drop_mm_ref(struct mm_struct *mm)
-{
- if (current->active_mm == mm)
- load_cr3(swapper_pg_dir);
-}
-#endif
-
-/*
- * While a process runs, Xen pins its pagetables, which means that the
- * hypervisor forces it to be read-only, and it controls all updates
- * to it. This means that all pagetable updates have to go via the
- * hypervisor, which is moderately expensive.
- *
- * Since we're pulling the pagetable down, we switch to use init_mm,
- * unpin old process pagetable and mark it all read-write, which
- * allows further operations on it to be simple memory accesses.
- *
- * The only subtle point is that another CPU may be still using the
- * pagetable because of lazy tlb flushing. This means we need need to
- * switch all CPUs off this pagetable before we can unpin it.
- */
-static void xen_exit_mmap(struct mm_struct *mm)
-{
- get_cpu(); /* make sure we don't move around */
- xen_drop_mm_ref(mm);
- put_cpu();
-
- spin_lock(&mm->page_table_lock);
-
- /* pgd may not be pinned in the error exit path of execve */
- if (xen_page_pinned(mm->pgd))
- xen_pgd_unpin(mm);
-
- spin_unlock(&mm->page_table_lock);
-}
-
-static void xen_post_allocator_init(void);
-
-static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
-{
- struct mmuext_op op;
-
- op.cmd = cmd;
- op.arg1.mfn = pfn_to_mfn(pfn);
- if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
- BUG();
-}
-
-#ifdef CONFIG_X86_64
-static void __init xen_cleanhighmap(unsigned long vaddr,
- unsigned long vaddr_end)
-{
- unsigned long kernel_end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
- pmd_t *pmd = level2_kernel_pgt + pmd_index(vaddr);
-
- /* NOTE: The loop is more greedy than the cleanup_highmap variant.
- * We include the PMD passed in on _both_ boundaries. */
- for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PTRS_PER_PMD));
- pmd++, vaddr += PMD_SIZE) {
- if (pmd_none(*pmd))
- continue;
- if (vaddr < (unsigned long) _text || vaddr > kernel_end)
- set_pmd(pmd, __pmd(0));
- }
- /* In case we did something silly, we should crash in this function
- * instead of somewhere later and be confusing. */
- xen_mc_flush();
-}
-
-/*
- * Make a page range writeable and free it.
- */
-static void __init xen_free_ro_pages(unsigned long paddr, unsigned long size)
-{
- void *vaddr = __va(paddr);
- void *vaddr_end = vaddr + size;
-
- for (; vaddr < vaddr_end; vaddr += PAGE_SIZE)
- make_lowmem_page_readwrite(vaddr);
-
- memblock_free(paddr, size);
-}
-
-static void __init xen_cleanmfnmap_free_pgtbl(void *pgtbl, bool unpin)
-{
- unsigned long pa = __pa(pgtbl) & PHYSICAL_PAGE_MASK;
-
- if (unpin)
- pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(pa));
- ClearPagePinned(virt_to_page(__va(pa)));
- xen_free_ro_pages(pa, PAGE_SIZE);
-}
-
-/*
- * Since it is well isolated we can (and since it is perhaps large we should)
- * also free the page tables mapping the initial P->M table.
- */
-static void __init xen_cleanmfnmap(unsigned long vaddr)
-{
- unsigned long va = vaddr & PMD_MASK;
- unsigned long pa;
- pgd_t *pgd = pgd_offset_k(va);
- pud_t *pud_page = pud_offset(pgd, 0);
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- unsigned int i;
- bool unpin;
-
- unpin = (vaddr == 2 * PGDIR_SIZE);
- set_pgd(pgd, __pgd(0));
- do {
- pud = pud_page + pud_index(va);
- if (pud_none(*pud)) {
- va += PUD_SIZE;
- } else if (pud_large(*pud)) {
- pa = pud_val(*pud) & PHYSICAL_PAGE_MASK;
- xen_free_ro_pages(pa, PUD_SIZE);
- va += PUD_SIZE;
- } else {
- pmd = pmd_offset(pud, va);
- if (pmd_large(*pmd)) {
- pa = pmd_val(*pmd) & PHYSICAL_PAGE_MASK;
- xen_free_ro_pages(pa, PMD_SIZE);
- } else if (!pmd_none(*pmd)) {
- pte = pte_offset_kernel(pmd, va);
- set_pmd(pmd, __pmd(0));
- for (i = 0; i < PTRS_PER_PTE; ++i) {
- if (pte_none(pte[i]))
- break;
- pa = pte_pfn(pte[i]) << PAGE_SHIFT;
- xen_free_ro_pages(pa, PAGE_SIZE);
- }
- xen_cleanmfnmap_free_pgtbl(pte, unpin);
- }
- va += PMD_SIZE;
- if (pmd_index(va))
- continue;
- set_pud(pud, __pud(0));
- xen_cleanmfnmap_free_pgtbl(pmd, unpin);
- }
-
- } while (pud_index(va) || pmd_index(va));
- xen_cleanmfnmap_free_pgtbl(pud_page, unpin);
-}
-
-static void __init xen_pagetable_p2m_free(void)
-{
- unsigned long size;
- unsigned long addr;
-
- size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
-
- /* No memory or already called. */
- if ((unsigned long)xen_p2m_addr == xen_start_info->mfn_list)
- return;
-
- /* using __ka address and sticking INVALID_P2M_ENTRY! */
- memset((void *)xen_start_info->mfn_list, 0xff, size);
-
- addr = xen_start_info->mfn_list;
- /*
- * We could be in __ka space.
- * We roundup to the PMD, which means that if anybody at this stage is
- * using the __ka address of xen_start_info or
- * xen_start_info->shared_info they are in going to crash. Fortunatly
- * we have already revectored in xen_setup_kernel_pagetable and in
- * xen_setup_shared_info.
- */
- size = roundup(size, PMD_SIZE);
-
- if (addr >= __START_KERNEL_map) {
- xen_cleanhighmap(addr, addr + size);
- size = PAGE_ALIGN(xen_start_info->nr_pages *
- sizeof(unsigned long));
- memblock_free(__pa(addr), size);
- } else {
- xen_cleanmfnmap(addr);
- }
-}
-
-static void __init xen_pagetable_cleanhighmap(void)
-{
- unsigned long size;
- unsigned long addr;
-
- /* At this stage, cleanup_highmap has already cleaned __ka space
- * from _brk_limit way up to the max_pfn_mapped (which is the end of
- * the ramdisk). We continue on, erasing PMD entries that point to page
- * tables - do note that they are accessible at this stage via __va.
- * For good measure we also round up to the PMD - which means that if
- * anybody is using __ka address to the initial boot-stack - and try
- * to use it - they are going to crash. The xen_start_info has been
- * taken care of already in xen_setup_kernel_pagetable. */
- addr = xen_start_info->pt_base;
- size = roundup(xen_start_info->nr_pt_frames * PAGE_SIZE, PMD_SIZE);
-
- xen_cleanhighmap(addr, addr + size);
- xen_start_info->pt_base = (unsigned long)__va(__pa(xen_start_info->pt_base));
-#ifdef DEBUG
- /* This is superfluous and is not necessary, but you know what
- * lets do it. The MODULES_VADDR -> MODULES_END should be clear of
- * anything at this stage. */
- xen_cleanhighmap(MODULES_VADDR, roundup(MODULES_VADDR, PUD_SIZE) - 1);
-#endif
-}
-#endif
-
-static void __init xen_pagetable_p2m_setup(void)
-{
- if (xen_feature(XENFEAT_auto_translated_physmap))
- return;
-
- xen_vmalloc_p2m_tree();
-
-#ifdef CONFIG_X86_64
- xen_pagetable_p2m_free();
-
- xen_pagetable_cleanhighmap();
-#endif
- /* And revector! Bye bye old array */
- xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
-}
-
-static void __init xen_pagetable_init(void)
-{
- paging_init();
- xen_post_allocator_init();
-
- xen_pagetable_p2m_setup();
-
- /* Allocate and initialize top and mid mfn levels for p2m structure */
- xen_build_mfn_list_list();
-
- /* Remap memory freed due to conflicts with E820 map */
- if (!xen_feature(XENFEAT_auto_translated_physmap))
- xen_remap_memory();
-
- xen_setup_shared_info();
-}
-static void xen_write_cr2(unsigned long cr2)
-{
- this_cpu_read(xen_vcpu)->arch.cr2 = cr2;
-}
-
-static unsigned long xen_read_cr2(void)
-{
- return this_cpu_read(xen_vcpu)->arch.cr2;
-}
-
-unsigned long xen_read_cr2_direct(void)
-{
- return this_cpu_read(xen_vcpu_info.arch.cr2);
-}
-
-void xen_flush_tlb_all(void)
-{
- struct mmuext_op *op;
- struct multicall_space mcs;
-
- trace_xen_mmu_flush_tlb_all(0);
-
- preempt_disable();
-
- mcs = xen_mc_entry(sizeof(*op));
-
- op = mcs.args;
- op->cmd = MMUEXT_TLB_FLUSH_ALL;
- MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-
- preempt_enable();
-}
-static void xen_flush_tlb(void)
-{
- struct mmuext_op *op;
- struct multicall_space mcs;
-
- trace_xen_mmu_flush_tlb(0);
-
- preempt_disable();
-
- mcs = xen_mc_entry(sizeof(*op));
-
- op = mcs.args;
- op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
- MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-
- preempt_enable();
-}
-
-static void xen_flush_tlb_single(unsigned long addr)
-{
- struct mmuext_op *op;
- struct multicall_space mcs;
-
- trace_xen_mmu_flush_tlb_single(addr);
-
- preempt_disable();
-
- mcs = xen_mc_entry(sizeof(*op));
- op = mcs.args;
- op->cmd = MMUEXT_INVLPG_LOCAL;
- op->arg1.linear_addr = addr & PAGE_MASK;
- MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-
- preempt_enable();
-}
-
-static void xen_flush_tlb_others(const struct cpumask *cpus,
- struct mm_struct *mm, unsigned long start,
- unsigned long end)
-{
- struct {
- struct mmuext_op op;
-#ifdef CONFIG_SMP
- DECLARE_BITMAP(mask, num_processors);
-#else
- DECLARE_BITMAP(mask, NR_CPUS);
-#endif
- } *args;
- struct multicall_space mcs;
-
- trace_xen_mmu_flush_tlb_others(cpus, mm, start, end);
-
- if (cpumask_empty(cpus))
- return; /* nothing to do */
-
- mcs = xen_mc_entry(sizeof(*args));
- args = mcs.args;
- args->op.arg2.vcpumask = to_cpumask(args->mask);
-
- /* Remove us, and any offline CPUS. */
- cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
- cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
-
- args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
- if (end != TLB_FLUSH_ALL && (end - start) <= PAGE_SIZE) {
- args->op.cmd = MMUEXT_INVLPG_MULTI;
- args->op.arg1.linear_addr = start;
- }
-
- MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
-}
-
-static unsigned long xen_read_cr3(void)
-{
- return this_cpu_read(xen_cr3);
-}
-
-static void set_current_cr3(void *v)
-{
- this_cpu_write(xen_current_cr3, (unsigned long)v);
-}
-
-static void __xen_write_cr3(bool kernel, unsigned long cr3)
-{
- struct mmuext_op op;
- unsigned long mfn;
-
- trace_xen_mmu_write_cr3(kernel, cr3);
-
- if (cr3)
- mfn = pfn_to_mfn(PFN_DOWN(cr3));
- else
- mfn = 0;
-
- WARN_ON(mfn == 0 && kernel);
-
- op.cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
- op.arg1.mfn = mfn;
-
- xen_extend_mmuext_op(&op);
-
- if (kernel) {
- this_cpu_write(xen_cr3, cr3);
-
- /* Update xen_current_cr3 once the batch has actually
- been submitted. */
- xen_mc_callback(set_current_cr3, (void *)cr3);
- }
-}
-static void xen_write_cr3(unsigned long cr3)
-{
- BUG_ON(preemptible());
-
- xen_mc_batch(); /* disables interrupts */
-
- /* Update while interrupts are disabled, so its atomic with
- respect to ipis */
- this_cpu_write(xen_cr3, cr3);
-
- __xen_write_cr3(true, cr3);
-
-#ifdef CONFIG_X86_64
- {
- pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
- if (user_pgd)
- __xen_write_cr3(false, __pa(user_pgd));
- else
- __xen_write_cr3(false, 0);
- }
-#endif
-
- xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
-}
-
-#ifdef CONFIG_X86_64
-/*
- * At the start of the day - when Xen launches a guest, it has already
- * built pagetables for the guest. We diligently look over them
- * in xen_setup_kernel_pagetable and graft as appropriate them in the
- * init_level4_pgt and its friends. Then when we are happy we load
- * the new init_level4_pgt - and continue on.
- *
- * The generic code starts (start_kernel) and 'init_mem_mapping' sets
- * up the rest of the pagetables. When it has completed it loads the cr3.
- * N.B. that baremetal would start at 'start_kernel' (and the early
- * #PF handler would create bootstrap pagetables) - so we are running
- * with the same assumptions as what to do when write_cr3 is executed
- * at this point.
- *
- * Since there are no user-page tables at all, we have two variants
- * of xen_write_cr3 - the early bootup (this one), and the late one
- * (xen_write_cr3). The reason we have to do that is that in 64-bit
- * the Linux kernel and user-space are both in ring 3 while the
- * hypervisor is in ring 0.
- */
-static void __init xen_write_cr3_init(unsigned long cr3)
-{
- BUG_ON(preemptible());
-
- xen_mc_batch(); /* disables interrupts */
-
- /* Update while interrupts are disabled, so its atomic with
- respect to ipis */
- this_cpu_write(xen_cr3, cr3);
-
- __xen_write_cr3(true, cr3);
-
- xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
-}
-#endif
-
-static int xen_pgd_alloc(struct mm_struct *mm)
-{
- pgd_t *pgd = mm->pgd;
- int ret = 0;
-
- BUG_ON(PagePinned(virt_to_page(pgd)));
-
-#ifdef CONFIG_X86_64
- {
- struct page *page = virt_to_page(pgd);
- pgd_t *user_pgd;
-
- BUG_ON(page->private != 0);
-
- ret = -ENOMEM;
-
- user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
- page->private = (unsigned long)user_pgd;
-
- if (user_pgd != NULL) {
-#ifdef CONFIG_X86_VSYSCALL_EMULATION
- user_pgd[pgd_index(VSYSCALL_ADDR)] =
- __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
-#endif
- ret = 0;
- }
-
- BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
- }
-#endif
-
- return ret;
-}
-
-static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-#ifdef CONFIG_X86_64
- pgd_t *user_pgd = xen_get_user_pgd(pgd);
-
- if (user_pgd)
- free_page((unsigned long)user_pgd);
-#endif
-}
-
-/*
- * Init-time set_pte while constructing initial pagetables, which
- * doesn't allow RO page table pages to be remapped RW.
- *
- * If there is no MFN for this PFN then this page is initially
- * ballooned out so clear the PTE (as in decrease_reservation() in
- * drivers/xen/balloon.c).
- *
- * Many of these PTE updates are done on unpinned and writable pages
- * and doing a hypercall for these is unnecessary and expensive. At
- * this point it is not possible to tell if a page is pinned or not,
- * so always write the PTE directly and rely on Xen trapping and
- * emulating any updates as necessary.
- */
-__visible pte_t xen_make_pte_init(pteval_t pte)
-{
-#ifdef CONFIG_X86_64
- unsigned long pfn;
-
- /*
- * Pages belonging to the initial p2m list mapped outside the default
- * address range must be mapped read-only. This region contains the
- * page tables for mapping the p2m list, too, and page tables MUST be
- * mapped read-only.
- */
- pfn = (pte & PTE_PFN_MASK) >> PAGE_SHIFT;
- if (xen_start_info->mfn_list < __START_KERNEL_map &&
- pfn >= xen_start_info->first_p2m_pfn &&
- pfn < xen_start_info->first_p2m_pfn + xen_start_info->nr_p2m_frames)
- pte &= ~_PAGE_RW;
-#endif
- pte = pte_pfn_to_mfn(pte);
- return native_make_pte(pte);
-}
-PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_init);
-
-static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
-{
-#ifdef CONFIG_X86_32
- /* If there's an existing pte, then don't allow _PAGE_RW to be set */
- if (pte_mfn(pte) != INVALID_P2M_ENTRY
- && pte_val_ma(*ptep) & _PAGE_PRESENT)
- pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
- pte_val_ma(pte));
-#endif
- native_set_pte(ptep, pte);
-}
-
-/* Early in boot, while setting up the initial pagetable, assume
- everything is pinned. */
-static void __init xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
-{
-#ifdef CONFIG_FLATMEM
- BUG_ON(mem_map); /* should only be used early */
-#endif
- make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
- pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
-}
-
-/* Used for pmd and pud */
-static void __init xen_alloc_pmd_init(struct mm_struct *mm, unsigned long pfn)
-{
-#ifdef CONFIG_FLATMEM
- BUG_ON(mem_map); /* should only be used early */
-#endif
- make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
-}
-
-/* Early release_pte assumes that all pts are pinned, since there's
- only init_mm and anything attached to that is pinned. */
-static void __init xen_release_pte_init(unsigned long pfn)
-{
- pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
- make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
-}
-
-static void __init xen_release_pmd_init(unsigned long pfn)
-{
- make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
-}
-
-static inline void __pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
-{
- struct multicall_space mcs;
- struct mmuext_op *op;
-
- mcs = __xen_mc_entry(sizeof(*op));
- op = mcs.args;
- op->cmd = cmd;
- op->arg1.mfn = pfn_to_mfn(pfn);
-
- MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
-}
-
-static inline void __set_pfn_prot(unsigned long pfn, pgprot_t prot)
-{
- struct multicall_space mcs;
- unsigned long addr = (unsigned long)__va(pfn << PAGE_SHIFT);
-
- mcs = __xen_mc_entry(0);
- MULTI_update_va_mapping(mcs.mc, (unsigned long)addr,
- pfn_pte(pfn, prot), 0);
-}
-
-/* This needs to make sure the new pte page is pinned iff its being
- attached to a pinned pagetable. */
-static inline void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn,
- unsigned level)
-{
- bool pinned = PagePinned(virt_to_page(mm->pgd));
-
- trace_xen_mmu_alloc_ptpage(mm, pfn, level, pinned);
-
- if (pinned) {
- struct page *page = pfn_to_page(pfn);
-
- SetPagePinned(page);
-
- if (!PageHighMem(page)) {
- xen_mc_batch();
-
- __set_pfn_prot(pfn, PAGE_KERNEL_RO);
-
- if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
- __pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
- } else {
- /* make sure there are no stray mappings of
- this page */
- kmap_flush_unused();
- }
- }
-}
-
-static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
-{
- xen_alloc_ptpage(mm, pfn, PT_PTE);
-}
-
-static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
-{
- xen_alloc_ptpage(mm, pfn, PT_PMD);
-}
-
-/* This should never happen until we're OK to use struct page */
-static inline void xen_release_ptpage(unsigned long pfn, unsigned level)
-{
- struct page *page = pfn_to_page(pfn);
- bool pinned = PagePinned(page);
-
- trace_xen_mmu_release_ptpage(pfn, level, pinned);
-
- if (pinned) {
- if (!PageHighMem(page)) {
- xen_mc_batch();
-
- if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
- __pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
-
- __set_pfn_prot(pfn, PAGE_KERNEL);
-
- xen_mc_issue(PARAVIRT_LAZY_MMU);
- }
- ClearPagePinned(page);
- }
-}
-
-static void xen_release_pte(unsigned long pfn)
-{
- xen_release_ptpage(pfn, PT_PTE);
-}
-
-static void xen_release_pmd(unsigned long pfn)
-{
- xen_release_ptpage(pfn, PT_PMD);
-}
-
-#if CONFIG_PGTABLE_LEVELS == 4
-static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
-{
- xen_alloc_ptpage(mm, pfn, PT_PUD);
-}
-
-static void xen_release_pud(unsigned long pfn)
-{
- xen_release_ptpage(pfn, PT_PUD);
-}
-#endif
-
-void __init xen_reserve_top(void)
-{
-#ifdef CONFIG_X86_32
- unsigned long top = HYPERVISOR_VIRT_START;
- struct xen_platform_parameters pp;
-
- if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
- top = pp.virt_start;
-
- reserve_top_address(-top);
-#endif /* CONFIG_X86_32 */
-}
-
-/*
- * Like __va(), but returns address in the kernel mapping (which is
- * all we have until the physical memory mapping has been set up.
- */
-static void * __init __ka(phys_addr_t paddr)
-{
-#ifdef CONFIG_X86_64
- return (void *)(paddr + __START_KERNEL_map);
-#else
- return __va(paddr);
-#endif
-}
-
-/* Convert a machine address to physical address */
-static unsigned long __init m2p(phys_addr_t maddr)
-{
- phys_addr_t paddr;
-
- maddr &= PTE_PFN_MASK;
- paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
-
- return paddr;
-}
-
-/* Convert a machine address to kernel virtual */
-static void * __init m2v(phys_addr_t maddr)
-{
- return __ka(m2p(maddr));
-}
-
-/* Set the page permissions on an identity-mapped pages */
-static void __init set_page_prot_flags(void *addr, pgprot_t prot,
- unsigned long flags)
-{
- unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
- pte_t pte = pfn_pte(pfn, prot);
-
- if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
- BUG();
-}
-static void __init set_page_prot(void *addr, pgprot_t prot)
-{
- return set_page_prot_flags(addr, prot, UVMF_NONE);
-}
-#ifdef CONFIG_X86_32
-static void __init xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
-{
- unsigned pmdidx, pteidx;
- unsigned ident_pte;
- unsigned long pfn;
-
- level1_ident_pgt = extend_brk(sizeof(pte_t) * LEVEL1_IDENT_ENTRIES,
- PAGE_SIZE);
-
- ident_pte = 0;
- pfn = 0;
- for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
- pte_t *pte_page;
-
- /* Reuse or allocate a page of ptes */
- if (pmd_present(pmd[pmdidx]))
- pte_page = m2v(pmd[pmdidx].pmd);
- else {
- /* Check for free pte pages */
- if (ident_pte == LEVEL1_IDENT_ENTRIES)
- break;
-
- pte_page = &level1_ident_pgt[ident_pte];
- ident_pte += PTRS_PER_PTE;
-
- pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
- }
-
- /* Install mappings */
- for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
- pte_t pte;
-
- if (pfn > max_pfn_mapped)
- max_pfn_mapped = pfn;
-
- if (!pte_none(pte_page[pteidx]))
- continue;
-
- pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
- pte_page[pteidx] = pte;
- }
- }
-
- for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
- set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
-
- set_page_prot(pmd, PAGE_KERNEL_RO);
-}
-#endif
-void __init xen_setup_machphys_mapping(void)
-{
- struct xen_machphys_mapping mapping;
-
- if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
- machine_to_phys_mapping = (unsigned long *)mapping.v_start;
- machine_to_phys_nr = mapping.max_mfn + 1;
- } else {
- machine_to_phys_nr = MACH2PHYS_NR_ENTRIES;
- }
-#ifdef CONFIG_X86_32
- WARN_ON((machine_to_phys_mapping + (machine_to_phys_nr - 1))
- < machine_to_phys_mapping);
-#endif
-}
-
-#ifdef CONFIG_X86_64
-static void __init convert_pfn_mfn(void *v)
-{
- pte_t *pte = v;
- int i;
-
- /* All levels are converted the same way, so just treat them
- as ptes. */
- for (i = 0; i < PTRS_PER_PTE; i++)
- pte[i] = xen_make_pte(pte[i].pte);
-}
-static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
- unsigned long addr)
-{
- if (*pt_base == PFN_DOWN(__pa(addr))) {
- set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
- clear_page((void *)addr);
- (*pt_base)++;
- }
- if (*pt_end == PFN_DOWN(__pa(addr))) {
- set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
- clear_page((void *)addr);
- (*pt_end)--;
- }
-}
-/*
- * Set up the initial kernel pagetable.
- *
- * We can construct this by grafting the Xen provided pagetable into
- * head_64.S's preconstructed pagetables. We copy the Xen L2's into
- * level2_ident_pgt, and level2_kernel_pgt. This means that only the
- * kernel has a physical mapping to start with - but that's enough to
- * get __va working. We need to fill in the rest of the physical
- * mapping once some sort of allocator has been set up.
- */
-void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
-{
- pud_t *l3;
- pmd_t *l2;
- unsigned long addr[3];
- unsigned long pt_base, pt_end;
- unsigned i;
-
- /* max_pfn_mapped is the last pfn mapped in the initial memory
- * mappings. Considering that on Xen after the kernel mappings we
- * have the mappings of some pages that don't exist in pfn space, we
- * set max_pfn_mapped to the last real pfn mapped. */
- if (xen_start_info->mfn_list < __START_KERNEL_map)
- max_pfn_mapped = xen_start_info->first_p2m_pfn;
- else
- max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
-
- pt_base = PFN_DOWN(__pa(xen_start_info->pt_base));
- pt_end = pt_base + xen_start_info->nr_pt_frames;
-
- /* Zap identity mapping */
- init_level4_pgt[0] = __pgd(0);
-
- if (!xen_feature(XENFEAT_auto_translated_physmap)) {
- /* Pre-constructed entries are in pfn, so convert to mfn */
- /* L4[272] -> level3_ident_pgt
- * L4[511] -> level3_kernel_pgt */
- convert_pfn_mfn(init_level4_pgt);
-
- /* L3_i[0] -> level2_ident_pgt */
- convert_pfn_mfn(level3_ident_pgt);
- /* L3_k[510] -> level2_kernel_pgt
- * L3_k[511] -> level2_fixmap_pgt */
- convert_pfn_mfn(level3_kernel_pgt);
-
- /* L3_k[511][506] -> level1_fixmap_pgt */
- convert_pfn_mfn(level2_fixmap_pgt);
- }
- /* We get [511][511] and have Xen's version of level2_kernel_pgt */
- l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
- l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
-
- addr[0] = (unsigned long)pgd;
- addr[1] = (unsigned long)l3;
- addr[2] = (unsigned long)l2;
- /* Graft it onto L4[272][0]. Note that we creating an aliasing problem:
- * Both L4[272][0] and L4[511][510] have entries that point to the same
- * L2 (PMD) tables. Meaning that if you modify it in __va space
- * it will be also modified in the __ka space! (But if you just
- * modify the PMD table to point to other PTE's or none, then you
- * are OK - which is what cleanup_highmap does) */
- copy_page(level2_ident_pgt, l2);
- /* Graft it onto L4[511][510] */
- copy_page(level2_kernel_pgt, l2);
-
- /* Copy the initial P->M table mappings if necessary. */
- i = pgd_index(xen_start_info->mfn_list);
- if (i && i < pgd_index(__START_KERNEL_map))
- init_level4_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
-
- if (!xen_feature(XENFEAT_auto_translated_physmap)) {
- /* Make pagetable pieces RO */
- set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
- set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
- set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
- set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
- set_page_prot(level2_ident_pgt, PAGE_KERNEL_RO);
- set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
- set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
- set_page_prot(level1_fixmap_pgt, PAGE_KERNEL_RO);
-
- /* Pin down new L4 */
- pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
- PFN_DOWN(__pa_symbol(init_level4_pgt)));
-
- /* Unpin Xen-provided one */
- pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
-
- /*
- * At this stage there can be no user pgd, and no page
- * structure to attach it to, so make sure we just set kernel
- * pgd.
- */
- xen_mc_batch();
- __xen_write_cr3(true, __pa(init_level4_pgt));
- xen_mc_issue(PARAVIRT_LAZY_CPU);
- } else
- native_write_cr3(__pa(init_level4_pgt));
-
- /* We can't that easily rip out L3 and L2, as the Xen pagetables are
- * set out this way: [L4], [L1], [L2], [L3], [L1], [L1] ... for
- * the initial domain. For guests using the toolstack, they are in:
- * [L4], [L3], [L2], [L1], [L1], order .. So for dom0 we can only
- * rip out the [L4] (pgd), but for guests we shave off three pages.
- */
- for (i = 0; i < ARRAY_SIZE(addr); i++)
- check_pt_base(&pt_base, &pt_end, addr[i]);
-
- /* Our (by three pages) smaller Xen pagetable that we are using */
- xen_pt_base = PFN_PHYS(pt_base);
- xen_pt_size = (pt_end - pt_base) * PAGE_SIZE;
- memblock_reserve(xen_pt_base, xen_pt_size);
-
- /* Revector the xen_start_info */
- xen_start_info = (struct start_info *)__va(__pa(xen_start_info));
-}
-
-/*
- * Read a value from a physical address.
- */
-static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
-{
- unsigned long *vaddr;
- unsigned long val;
+#include <linux/pfn.h>
+#include <asm/xen/page.h>
+#include <asm/xen/hypercall.h>
+#include <xen/interface/memory.h>
- vaddr = early_memremap_ro(addr, sizeof(val));
- val = *vaddr;
- early_memunmap(vaddr, sizeof(val));
- return val;
-}
+#include "multicalls.h"
+#include "mmu.h"
/*
- * Translate a virtual address to a physical one without relying on mapped
- * page tables.
+ * Protects atomic reservation decrease/increase against concurrent increases.
+ * Also protects non-atomic updates of current_pages and balloon lists.
*/
-static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
-{
- phys_addr_t pa;
- pgd_t pgd;
- pud_t pud;
- pmd_t pmd;
- pte_t pte;
-
- pa = read_cr3();
- pgd = native_make_pgd(xen_read_phys_ulong(pa + pgd_index(vaddr) *
- sizeof(pgd)));
- if (!pgd_present(pgd))
- return 0;
-
- pa = pgd_val(pgd) & PTE_PFN_MASK;
- pud = native_make_pud(xen_read_phys_ulong(pa + pud_index(vaddr) *
- sizeof(pud)));
- if (!pud_present(pud))
- return 0;
- pa = pud_pfn(pud) << PAGE_SHIFT;
- if (pud_large(pud))
- return pa + (vaddr & ~PUD_MASK);
-
- pmd = native_make_pmd(xen_read_phys_ulong(pa + pmd_index(vaddr) *
- sizeof(pmd)));
- if (!pmd_present(pmd))
- return 0;
- pa = pmd_pfn(pmd) << PAGE_SHIFT;
- if (pmd_large(pmd))
- return pa + (vaddr & ~PMD_MASK);
-
- pte = native_make_pte(xen_read_phys_ulong(pa + pte_index(vaddr) *
- sizeof(pte)));
- if (!pte_present(pte))
- return 0;
- pa = pte_pfn(pte) << PAGE_SHIFT;
-
- return pa | (vaddr & ~PAGE_MASK);
-}
+DEFINE_SPINLOCK(xen_reservation_lock);
-/*
- * Find a new area for the hypervisor supplied p2m list and relocate the p2m to
- * this area.
- */
-void __init xen_relocate_p2m(void)
+unsigned long arbitrary_virt_to_mfn(void *vaddr)
{
- phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys;
- unsigned long p2m_pfn, p2m_pfn_end, n_frames, pfn, pfn_end;
- int n_pte, n_pt, n_pmd, n_pud, idx_pte, idx_pt, idx_pmd, idx_pud;
- pte_t *pt;
- pmd_t *pmd;
- pud_t *pud;
- pgd_t *pgd;
- unsigned long *new_p2m;
-
- size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
- n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
- n_pt = roundup(size, PMD_SIZE) >> PMD_SHIFT;
- n_pmd = roundup(size, PUD_SIZE) >> PUD_SHIFT;
- n_pud = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
- n_frames = n_pte + n_pt + n_pmd + n_pud;
-
- new_area = xen_find_free_area(PFN_PHYS(n_frames));
- if (!new_area) {
- xen_raw_console_write("Can't find new memory area for p2m needed due to E820 map conflict\n");
- BUG();
- }
-
- /*
- * Setup the page tables for addressing the new p2m list.
- * We have asked the hypervisor to map the p2m list at the user address
- * PUD_SIZE. It may have done so, or it may have used a kernel space
- * address depending on the Xen version.
- * To avoid any possible virtual address collision, just use
- * 2 * PUD_SIZE for the new area.
- */
- pud_phys = new_area;
- pmd_phys = pud_phys + PFN_PHYS(n_pud);
- pt_phys = pmd_phys + PFN_PHYS(n_pmd);
- p2m_pfn = PFN_DOWN(pt_phys) + n_pt;
-
- pgd = __va(read_cr3());
- new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
- for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
- pud = early_memremap(pud_phys, PAGE_SIZE);
- clear_page(pud);
- for (idx_pmd = 0; idx_pmd < min(n_pmd, PTRS_PER_PUD);
- idx_pmd++) {
- pmd = early_memremap(pmd_phys, PAGE_SIZE);
- clear_page(pmd);
- for (idx_pt = 0; idx_pt < min(n_pt, PTRS_PER_PMD);
- idx_pt++) {
- pt = early_memremap(pt_phys, PAGE_SIZE);
- clear_page(pt);
- for (idx_pte = 0;
- idx_pte < min(n_pte, PTRS_PER_PTE);
- idx_pte++) {
- set_pte(pt + idx_pte,
- pfn_pte(p2m_pfn, PAGE_KERNEL));
- p2m_pfn++;
- }
- n_pte -= PTRS_PER_PTE;
- early_memunmap(pt, PAGE_SIZE);
- make_lowmem_page_readonly(__va(pt_phys));
- pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE,
- PFN_DOWN(pt_phys));
- set_pmd(pmd + idx_pt,
- __pmd(_PAGE_TABLE | pt_phys));
- pt_phys += PAGE_SIZE;
- }
- n_pt -= PTRS_PER_PMD;
- early_memunmap(pmd, PAGE_SIZE);
- make_lowmem_page_readonly(__va(pmd_phys));
- pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE,
- PFN_DOWN(pmd_phys));
- set_pud(pud + idx_pmd, __pud(_PAGE_TABLE | pmd_phys));
- pmd_phys += PAGE_SIZE;
- }
- n_pmd -= PTRS_PER_PUD;
- early_memunmap(pud, PAGE_SIZE);
- make_lowmem_page_readonly(__va(pud_phys));
- pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));
- set_pgd(pgd + 2 + idx_pud, __pgd(_PAGE_TABLE | pud_phys));
- pud_phys += PAGE_SIZE;
- }
-
- /* Now copy the old p2m info to the new area. */
- memcpy(new_p2m, xen_p2m_addr, size);
- xen_p2m_addr = new_p2m;
-
- /* Release the old p2m list and set new list info. */
- p2m_pfn = PFN_DOWN(xen_early_virt_to_phys(xen_start_info->mfn_list));
- BUG_ON(!p2m_pfn);
- p2m_pfn_end = p2m_pfn + PFN_DOWN(size);
-
- if (xen_start_info->mfn_list < __START_KERNEL_map) {
- pfn = xen_start_info->first_p2m_pfn;
- pfn_end = xen_start_info->first_p2m_pfn +
- xen_start_info->nr_p2m_frames;
- set_pgd(pgd + 1, __pgd(0));
- } else {
- pfn = p2m_pfn;
- pfn_end = p2m_pfn_end;
- }
-
- memblock_free(PFN_PHYS(pfn), PAGE_SIZE * (pfn_end - pfn));
- while (pfn < pfn_end) {
- if (pfn == p2m_pfn) {
- pfn = p2m_pfn_end;
- continue;
- }
- make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
- pfn++;
- }
+ xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
- xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
- xen_start_info->first_p2m_pfn = PFN_DOWN(new_area);
- xen_start_info->nr_p2m_frames = n_frames;
+ return PFN_DOWN(maddr.maddr);
}
-#else /* !CONFIG_X86_64 */
-static RESERVE_BRK_ARRAY(pmd_t, initial_kernel_pmd, PTRS_PER_PMD);
-static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);
-
-static void __init xen_write_cr3_init(unsigned long cr3)
+xmaddr_t arbitrary_virt_to_machine(void *vaddr)
{
- unsigned long pfn = PFN_DOWN(__pa(swapper_pg_dir));
-
- BUG_ON(read_cr3() != __pa(initial_page_table));
- BUG_ON(cr3 != __pa(swapper_pg_dir));
+ unsigned long address = (unsigned long)vaddr;
+ unsigned int level;
+ pte_t *pte;
+ unsigned offset;
/*
- * We are switching to swapper_pg_dir for the first time (from
- * initial_page_table) and therefore need to mark that page
- * read-only and then pin it.
- *
- * Xen disallows sharing of kernel PMDs for PAE
- * guests. Therefore we must copy the kernel PMD from
- * initial_page_table into a new kernel PMD to be used in
- * swapper_pg_dir.
+ * if the PFN is in the linear mapped vaddr range, we can just use
+ * the (quick) virt_to_machine() p2m lookup
*/
- swapper_kernel_pmd =
- extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
- copy_page(swapper_kernel_pmd, initial_kernel_pmd);
- swapper_pg_dir[KERNEL_PGD_BOUNDARY] =
- __pgd(__pa(swapper_kernel_pmd) | _PAGE_PRESENT);
- set_page_prot(swapper_kernel_pmd, PAGE_KERNEL_RO);
-
- set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
- xen_write_cr3(cr3);
- pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, pfn);
-
- pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
- PFN_DOWN(__pa(initial_page_table)));
- set_page_prot(initial_page_table, PAGE_KERNEL);
- set_page_prot(initial_kernel_pmd, PAGE_KERNEL);
-
- pv_mmu_ops.write_cr3 = &xen_write_cr3;
-}
-
-/*
- * For 32 bit domains xen_start_info->pt_base is the pgd address which might be
- * not the first page table in the page table pool.
- * Iterate through the initial page tables to find the real page table base.
- */
-static phys_addr_t xen_find_pt_base(pmd_t *pmd)
-{
- phys_addr_t pt_base, paddr;
- unsigned pmdidx;
-
- pt_base = min(__pa(xen_start_info->pt_base), __pa(pmd));
-
- for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++)
- if (pmd_present(pmd[pmdidx]) && !pmd_large(pmd[pmdidx])) {
- paddr = m2p(pmd[pmdidx].pmd);
- pt_base = min(pt_base, paddr);
- }
-
- return pt_base;
-}
-
-void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
-{
- pmd_t *kernel_pmd;
-
- kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
-
- xen_pt_base = xen_find_pt_base(kernel_pmd);
- xen_pt_size = xen_start_info->nr_pt_frames * PAGE_SIZE;
-
- initial_kernel_pmd =
- extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
-
- max_pfn_mapped = PFN_DOWN(xen_pt_base + xen_pt_size + 512 * 1024);
-
- copy_page(initial_kernel_pmd, kernel_pmd);
-
- xen_map_identity_early(initial_kernel_pmd, max_pfn);
-
- copy_page(initial_page_table, pgd);
- initial_page_table[KERNEL_PGD_BOUNDARY] =
- __pgd(__pa(initial_kernel_pmd) | _PAGE_PRESENT);
-
- set_page_prot(initial_kernel_pmd, PAGE_KERNEL_RO);
- set_page_prot(initial_page_table, PAGE_KERNEL_RO);
- set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
-
- pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
-
- pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE,
- PFN_DOWN(__pa(initial_page_table)));
- xen_write_cr3(__pa(initial_page_table));
-
- memblock_reserve(xen_pt_base, xen_pt_size);
-}
-#endif /* CONFIG_X86_64 */
-
-void __init xen_reserve_special_pages(void)
-{
- phys_addr_t paddr;
-
- memblock_reserve(__pa(xen_start_info), PAGE_SIZE);
- if (xen_start_info->store_mfn) {
- paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->store_mfn));
- memblock_reserve(paddr, PAGE_SIZE);
- }
- if (!xen_initial_domain()) {
- paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->console.domU.mfn));
- memblock_reserve(paddr, PAGE_SIZE);
- }
-}
-
-void __init xen_pt_check_e820(void)
-{
- if (xen_is_e820_reserved(xen_pt_base, xen_pt_size)) {
- xen_raw_console_write("Xen hypervisor allocated page table memory conflicts with E820 map\n");
- BUG();
- }
-}
-
-static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
-
-static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
-{
- pte_t pte;
-
- phys >>= PAGE_SHIFT;
-
- switch (idx) {
- case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
- case FIX_RO_IDT:
-#ifdef CONFIG_X86_32
- case FIX_WP_TEST:
-# ifdef CONFIG_HIGHMEM
- case FIX_KMAP_BEGIN ... FIX_KMAP_END:
-# endif
-#elif defined(CONFIG_X86_VSYSCALL_EMULATION)
- case VSYSCALL_PAGE:
-#endif
- case FIX_TEXT_POKE0:
- case FIX_TEXT_POKE1:
- /* All local page mappings */
- pte = pfn_pte(phys, prot);
- break;
-
-#ifdef CONFIG_X86_LOCAL_APIC
- case FIX_APIC_BASE: /* maps dummy local APIC */
- pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
- break;
-#endif
-
-#ifdef CONFIG_X86_IO_APIC
- case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END:
- /*
- * We just don't map the IO APIC - all access is via
- * hypercalls. Keep the address in the pte for reference.
- */
- pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
- break;
-#endif
-
- case FIX_PARAVIRT_BOOTMAP:
- /* This is an MFN, but it isn't an IO mapping from the
- IO domain */
- pte = mfn_pte(phys, prot);
- break;
-
- default:
- /* By default, set_fixmap is used for hardware mappings */
- pte = mfn_pte(phys, prot);
- break;
- }
-
- __native_set_fixmap(idx, pte);
-
-#ifdef CONFIG_X86_VSYSCALL_EMULATION
- /* Replicate changes to map the vsyscall page into the user
- pagetable vsyscall mapping. */
- if (idx == VSYSCALL_PAGE) {
- unsigned long vaddr = __fix_to_virt(idx);
- set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
- }
-#endif
-}
-
-static void __init xen_post_allocator_init(void)
-{
- if (xen_feature(XENFEAT_auto_translated_physmap))
- return;
-
- pv_mmu_ops.set_pte = xen_set_pte;
- pv_mmu_ops.set_pmd = xen_set_pmd;
- pv_mmu_ops.set_pud = xen_set_pud;
-#if CONFIG_PGTABLE_LEVELS == 4
- pv_mmu_ops.set_pgd = xen_set_pgd;
-#endif
-
- /* This will work as long as patching hasn't happened yet
- (which it hasn't) */
- pv_mmu_ops.alloc_pte = xen_alloc_pte;
- pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
- pv_mmu_ops.release_pte = xen_release_pte;
- pv_mmu_ops.release_pmd = xen_release_pmd;
-#if CONFIG_PGTABLE_LEVELS == 4
- pv_mmu_ops.alloc_pud = xen_alloc_pud;
- pv_mmu_ops.release_pud = xen_release_pud;
-#endif
- pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte);
-
-#ifdef CONFIG_X86_64
- pv_mmu_ops.write_cr3 = &xen_write_cr3;
- SetPagePinned(virt_to_page(level3_user_vsyscall));
-#endif
- xen_mark_init_mm_pinned();
-}
-
-static void xen_leave_lazy_mmu(void)
-{
- preempt_disable();
- xen_mc_flush();
- paravirt_leave_lazy_mmu();
- preempt_enable();
-}
-
-static const struct pv_mmu_ops xen_mmu_ops __initconst = {
- .read_cr2 = xen_read_cr2,
- .write_cr2 = xen_write_cr2,
-
- .read_cr3 = xen_read_cr3,
- .write_cr3 = xen_write_cr3_init,
-
- .flush_tlb_user = xen_flush_tlb,
- .flush_tlb_kernel = xen_flush_tlb,
- .flush_tlb_single = xen_flush_tlb_single,
- .flush_tlb_others = xen_flush_tlb_others,
-
- .pte_update = paravirt_nop,
-
- .pgd_alloc = xen_pgd_alloc,
- .pgd_free = xen_pgd_free,
-
- .alloc_pte = xen_alloc_pte_init,
- .release_pte = xen_release_pte_init,
- .alloc_pmd = xen_alloc_pmd_init,
- .release_pmd = xen_release_pmd_init,
-
- .set_pte = xen_set_pte_init,
- .set_pte_at = xen_set_pte_at,
- .set_pmd = xen_set_pmd_hyper,
-
- .ptep_modify_prot_start = __ptep_modify_prot_start,
- .ptep_modify_prot_commit = __ptep_modify_prot_commit,
-
- .pte_val = PV_CALLEE_SAVE(xen_pte_val),
- .pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
-
- .make_pte = PV_CALLEE_SAVE(xen_make_pte_init),
- .make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
-
-#ifdef CONFIG_X86_PAE
- .set_pte_atomic = xen_set_pte_atomic,
- .pte_clear = xen_pte_clear,
- .pmd_clear = xen_pmd_clear,
-#endif /* CONFIG_X86_PAE */
- .set_pud = xen_set_pud_hyper,
-
- .make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
- .pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
-
-#if CONFIG_PGTABLE_LEVELS == 4
- .pud_val = PV_CALLEE_SAVE(xen_pud_val),
- .make_pud = PV_CALLEE_SAVE(xen_make_pud),
- .set_pgd = xen_set_pgd_hyper,
-
- .alloc_pud = xen_alloc_pmd_init,
- .release_pud = xen_release_pmd_init,
-#endif /* CONFIG_PGTABLE_LEVELS == 4 */
-
- .activate_mm = xen_activate_mm,
- .dup_mmap = xen_dup_mmap,
- .exit_mmap = xen_exit_mmap,
-
- .lazy_mode = {
- .enter = paravirt_enter_lazy_mmu,
- .leave = xen_leave_lazy_mmu,
- .flush = paravirt_flush_lazy_mmu,
- },
-
- .set_fixmap = xen_set_fixmap,
-};
-
-void __init xen_init_mmu_ops(void)
-{
- x86_init.paging.pagetable_init = xen_pagetable_init;
-
- if (xen_feature(XENFEAT_auto_translated_physmap))
- return;
+ if (virt_addr_valid(vaddr))
+ return virt_to_machine(vaddr);
- pv_mmu_ops = xen_mmu_ops;
+ /* otherwise we have to do a (slower) full page-table walk */
- memset(dummy_mapping, 0xff, PAGE_SIZE);
+ pte = lookup_address(address, &level);
+ BUG_ON(pte == NULL);
+ offset = address & ~PAGE_MASK;
+ return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
}
+EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
-/* Protected by xen_reservation_lock. */
-#define MAX_CONTIG_ORDER 9 /* 2MB */
-static unsigned long discontig_frames[1<<MAX_CONTIG_ORDER];
-
-#define VOID_PTE (mfn_pte(0, __pgprot(0)))
-static void xen_zap_pfn_range(unsigned long vaddr, unsigned int order,
- unsigned long *in_frames,
- unsigned long *out_frames)
+void xen_flush_tlb_all(void)
{
- int i;
+ struct mmuext_op *op;
struct multicall_space mcs;
- xen_mc_batch();
- for (i = 0; i < (1UL<<order); i++, vaddr += PAGE_SIZE) {
- mcs = __xen_mc_entry(0);
-
- if (in_frames)
- in_frames[i] = virt_to_mfn(vaddr);
-
- MULTI_update_va_mapping(mcs.mc, vaddr, VOID_PTE, 0);
- __set_phys_to_machine(virt_to_pfn(vaddr), INVALID_P2M_ENTRY);
-
- if (out_frames)
- out_frames[i] = virt_to_pfn(vaddr);
- }
- xen_mc_issue(0);
-}
-
-/*
- * Update the pfn-to-mfn mappings for a virtual address range, either to
- * point to an array of mfns, or contiguously from a single starting
- * mfn.
- */
-static void xen_remap_exchanged_ptes(unsigned long vaddr, int order,
- unsigned long *mfns,
- unsigned long first_mfn)
-{
- unsigned i, limit;
- unsigned long mfn;
-
- xen_mc_batch();
-
- limit = 1u << order;
- for (i = 0; i < limit; i++, vaddr += PAGE_SIZE) {
- struct multicall_space mcs;
- unsigned flags;
-
- mcs = __xen_mc_entry(0);
- if (mfns)
- mfn = mfns[i];
- else
- mfn = first_mfn + i;
-
- if (i < (limit - 1))
- flags = 0;
- else {
- if (order == 0)
- flags = UVMF_INVLPG | UVMF_ALL;
- else
- flags = UVMF_TLB_FLUSH | UVMF_ALL;
- }
-
- MULTI_update_va_mapping(mcs.mc, vaddr,
- mfn_pte(mfn, PAGE_KERNEL), flags);
-
- set_phys_to_machine(virt_to_pfn(vaddr), mfn);
- }
-
- xen_mc_issue(0);
-}
-
-/*
- * Perform the hypercall to exchange a region of our pfns to point to
- * memory with the required contiguous alignment. Takes the pfns as
- * input, and populates mfns as output.
- *
- * Returns a success code indicating whether the hypervisor was able to
- * satisfy the request or not.
- */
-static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
- unsigned long *pfns_in,
- unsigned long extents_out,
- unsigned int order_out,
- unsigned long *mfns_out,
- unsigned int address_bits)
-{
- long rc;
- int success;
-
- struct xen_memory_exchange exchange = {
- .in = {
- .nr_extents = extents_in,
- .extent_order = order_in,
- .extent_start = pfns_in,
- .domid = DOMID_SELF
- },
- .out = {
- .nr_extents = extents_out,
- .extent_order = order_out,
- .extent_start = mfns_out,
- .address_bits = address_bits,
- .domid = DOMID_SELF
- }
- };
-
- BUG_ON(extents_in << order_in != extents_out << order_out);
-
- rc = HYPERVISOR_memory_op(XENMEM_exchange, &exchange);
- success = (exchange.nr_exchanged == extents_in);
-
- BUG_ON(!success && ((exchange.nr_exchanged != 0) || (rc == 0)));
- BUG_ON(success && (rc != 0));
-
- return success;
-}
-
-int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
- unsigned int address_bits,
- dma_addr_t *dma_handle)
-{
- unsigned long *in_frames = discontig_frames, out_frame;
- unsigned long flags;
- int success;
- unsigned long vstart = (unsigned long)phys_to_virt(pstart);
-
- /*
- * Currently an auto-translated guest will not perform I/O, nor will
- * it require PAE page directories below 4GB. Therefore any calls to
- * this function are redundant and can be ignored.
- */
-
- if (xen_feature(XENFEAT_auto_translated_physmap))
- return 0;
-
- if (unlikely(order > MAX_CONTIG_ORDER))
- return -ENOMEM;
-
- memset((void *) vstart, 0, PAGE_SIZE << order);
-
- spin_lock_irqsave(&xen_reservation_lock, flags);
-
- /* 1. Zap current PTEs, remembering MFNs. */
- xen_zap_pfn_range(vstart, order, in_frames, NULL);
-
- /* 2. Get a new contiguous memory extent. */
- out_frame = virt_to_pfn(vstart);
- success = xen_exchange_memory(1UL << order, 0, in_frames,
- 1, order, &out_frame,
- address_bits);
-
- /* 3. Map the new extent in place of old pages. */
- if (success)
- xen_remap_exchanged_ptes(vstart, order, NULL, out_frame);
- else
- xen_remap_exchanged_ptes(vstart, order, in_frames, 0);
-
- spin_unlock_irqrestore(&xen_reservation_lock, flags);
-
- *dma_handle = virt_to_machine(vstart).maddr;
- return success ? 0 : -ENOMEM;
-}
-EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
-
-void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
-{
- unsigned long *out_frames = discontig_frames, in_frame;
- unsigned long flags;
- int success;
- unsigned long vstart;
-
- if (xen_feature(XENFEAT_auto_translated_physmap))
- return;
-
- if (unlikely(order > MAX_CONTIG_ORDER))
- return;
-
- vstart = (unsigned long)phys_to_virt(pstart);
- memset((void *) vstart, 0, PAGE_SIZE << order);
-
- spin_lock_irqsave(&xen_reservation_lock, flags);
+ trace_xen_mmu_flush_tlb_all(0);
- /* 1. Find start MFN of contiguous extent. */
- in_frame = virt_to_mfn(vstart);
+ preempt_disable();
- /* 2. Zap current PTEs. */
- xen_zap_pfn_range(vstart, order, NULL, out_frames);
+ mcs = xen_mc_entry(sizeof(*op));
- /* 3. Do the exchange for non-contiguous MFNs. */
- success = xen_exchange_memory(1, order, &in_frame, 1UL << order,
- 0, out_frames, 0);
+ op = mcs.args;
+ op->cmd = MMUEXT_TLB_FLUSH_ALL;
+ MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
- /* 4. Map new pages in place of old pages. */
- if (success)
- xen_remap_exchanged_ptes(vstart, order, out_frames, 0);
- else
- xen_remap_exchanged_ptes(vstart, order, NULL, in_frame);
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
- spin_unlock_irqrestore(&xen_reservation_lock, flags);
+ preempt_enable();
}
-EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
#define REMAP_BATCH_SIZE 16
@@ -2818,7 +191,6 @@ int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
}
EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
-
/* Returns: 0 success */
int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
int numpgs, struct page **pages)
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
new file mode 100644
index 0000000..49137fd
--- /dev/null
+++ b/arch/x86/xen/mmu_pv.c
@@ -0,0 +1,2635 @@
+/*
+ * Xen mmu operations
+ *
+ * This file contains the various mmu fetch and update operations.
+ * The most important job they must perform is the mapping between the
+ * domain's pfn and the overall machine mfns.
+ *
+ * Xen allows guests to directly update the pagetable, in a controlled
+ * fashion. In other words, the guest modifies the same pagetable
+ * that the CPU actually uses, which eliminates the overhead of having
+ * a separate shadow pagetable.
+ *
+ * In order to allow this, it falls on the guest domain to map its
+ * notion of a "physical" pfn - which is just a domain-local linear
+ * address - into a real "machine address" which the CPU's MMU can
+ * use.
+ *
+ * A pgd_t/pmd_t/pte_t will typically contain an mfn, and so can be
+ * inserted directly into the pagetable. When creating a new
+ * pte/pmd/pgd, it converts the passed pfn into an mfn. Conversely,
+ * when reading the content back with __(pgd|pmd|pte)_val, it converts
+ * the mfn back into a pfn.
+ *
+ * The other constraint is that all pages which make up a pagetable
+ * must be mapped read-only in the guest. This prevents uncontrolled
+ * guest updates to the pagetable. Xen strictly enforces this, and
+ * will disallow any pagetable update which will end up mapping a
+ * pagetable page RW, and will disallow using any writable page as a
+ * pagetable.
+ *
+ * Naively, when loading %cr3 with the base of a new pagetable, Xen
+ * would need to validate the whole pagetable before going on.
+ * Naturally, this is quite slow. The solution is to "pin" a
+ * pagetable, which enforces all the constraints on the pagetable even
+ * when it is not actively in use. This menas that Xen can be assured
+ * that it is still valid when you do load it into %cr3, and doesn't
+ * need to revalidate it.
+ *
+ * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
+ */
+#include <linux/sched.h>
+#include <linux/highmem.h>
+#include <linux/debugfs.h>
+#include <linux/bug.h>
+#include <linux/vmalloc.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/memblock.h>
+#include <linux/seq_file.h>
+#include <linux/crash_dump.h>
+
+#include <trace/events/xen.h>
+
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/fixmap.h>
+#include <asm/mmu_context.h>
+#include <asm/setup.h>
+#include <asm/paravirt.h>
+#include <asm/e820.h>
+#include <asm/linkage.h>
+#include <asm/page.h>
+#include <asm/init.h>
+#include <asm/pat.h>
+#include <asm/smp.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/hvm/hvm_op.h>
+#include <xen/interface/version.h>
+#include <xen/interface/memory.h>
+#include <xen/hvc-console.h>
+
+#include "multicalls.h"
+#include "mmu.h"
+#include "debugfs.h"
+
+#ifdef CONFIG_X86_32
+/*
+ * Identity map, in addition to plain kernel map. This needs to be
+ * large enough to allocate page table pages to allocate the rest.
+ * Each page can map 2MB.
+ */
+#define LEVEL1_IDENT_ENTRIES (PTRS_PER_PTE * 4)
+static RESERVE_BRK_ARRAY(pte_t, level1_ident_pgt, LEVEL1_IDENT_ENTRIES);
+#endif
+#ifdef CONFIG_X86_64
+/* l3 pud for userspace vsyscall mapping */
+static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
+#endif /* CONFIG_X86_64 */
+
+/*
+ * Note about cr3 (pagetable base) values:
+ *
+ * xen_cr3 contains the current logical cr3 value; it contains the
+ * last set cr3. This may not be the current effective cr3, because
+ * its update may be being lazily deferred. However, a vcpu looking
+ * at its own cr3 can use this value knowing that it everything will
+ * be self-consistent.
+ *
+ * xen_current_cr3 contains the actual vcpu cr3; it is set once the
+ * hypercall to set the vcpu cr3 is complete (so it may be a little
+ * out of date, but it will never be set early). If one vcpu is
+ * looking at another vcpu's cr3 value, it should use this variable.
+ */
+DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
+DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
+
+static phys_addr_t xen_pt_base, xen_pt_size __initdata;
+
+/*
+ * Just beyond the highest usermode address. STACK_TOP_MAX has a
+ * redzone above it, so round it up to a PGD boundary.
+ */
+#define USER_LIMIT ((STACK_TOP_MAX + PGDIR_SIZE - 1) & PGDIR_MASK)
+
+void make_lowmem_page_readonly(void *vaddr)
+{
+ pte_t *pte, ptev;
+ unsigned long address = (unsigned long)vaddr;
+ unsigned int level;
+
+ pte = lookup_address(address, &level);
+ if (pte == NULL)
+ return; /* vaddr missing */
+
+ ptev = pte_wrprotect(*pte);
+
+ if (HYPERVISOR_update_va_mapping(address, ptev, 0))
+ BUG();
+}
+
+void make_lowmem_page_readwrite(void *vaddr)
+{
+ pte_t *pte, ptev;
+ unsigned long address = (unsigned long)vaddr;
+ unsigned int level;
+
+ pte = lookup_address(address, &level);
+ if (pte == NULL)
+ return; /* vaddr missing */
+
+ ptev = pte_mkwrite(*pte);
+
+ if (HYPERVISOR_update_va_mapping(address, ptev, 0))
+ BUG();
+}
+
+
+static bool xen_page_pinned(void *ptr)
+{
+ struct page *page = virt_to_page(ptr);
+
+ return PagePinned(page);
+}
+
+void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
+{
+ struct multicall_space mcs;
+ struct mmu_update *u;
+
+ trace_xen_mmu_set_domain_pte(ptep, pteval, domid);
+
+ mcs = xen_mc_entry(sizeof(*u));
+ u = mcs.args;
+
+ /* ptep might be kmapped when using 32-bit HIGHPTE */
+ u->ptr = virt_to_machine(ptep).maddr;
+ u->val = pte_val_ma(pteval);
+
+ MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+}
+EXPORT_SYMBOL_GPL(xen_set_domain_pte);
+
+static void xen_extend_mmu_update(const struct mmu_update *update)
+{
+ struct multicall_space mcs;
+ struct mmu_update *u;
+
+ mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
+
+ if (mcs.mc != NULL) {
+ mcs.mc->args[1]++;
+ } else {
+ mcs = __xen_mc_entry(sizeof(*u));
+ MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
+ }
+
+ u = mcs.args;
+ *u = *update;
+}
+
+static void xen_extend_mmuext_op(const struct mmuext_op *op)
+{
+ struct multicall_space mcs;
+ struct mmuext_op *u;
+
+ mcs = xen_mc_extend_args(__HYPERVISOR_mmuext_op, sizeof(*u));
+
+ if (mcs.mc != NULL) {
+ mcs.mc->args[1]++;
+ } else {
+ mcs = __xen_mc_entry(sizeof(*u));
+ MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
+ }
+
+ u = mcs.args;
+ *u = *op;
+}
+
+static void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
+{
+ struct mmu_update u;
+
+ preempt_disable();
+
+ xen_mc_batch();
+
+ /* ptr may be ioremapped for 64-bit pagetable setup */
+ u.ptr = arbitrary_virt_to_machine(ptr).maddr;
+ u.val = pmd_val_ma(val);
+ xen_extend_mmu_update(&u);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+ preempt_enable();
+}
+
+static void xen_set_pmd(pmd_t *ptr, pmd_t val)
+{
+ trace_xen_mmu_set_pmd(ptr, val);
+
+ /* If page is not pinned, we can just update the entry
+ directly */
+ if (!xen_page_pinned(ptr)) {
+ *ptr = val;
+ return;
+ }
+
+ xen_set_pmd_hyper(ptr, val);
+}
+
+/*
+ * Associate a virtual page frame with a given physical page frame
+ * and protection flags for that frame.
+ */
+void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
+{
+ set_pte_vaddr(vaddr, mfn_pte(mfn, flags));
+}
+
+static bool xen_batched_set_pte(pte_t *ptep, pte_t pteval)
+{
+ struct mmu_update u;
+
+ if (paravirt_get_lazy_mode() != PARAVIRT_LAZY_MMU)
+ return false;
+
+ xen_mc_batch();
+
+ u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
+ u.val = pte_val_ma(pteval);
+ xen_extend_mmu_update(&u);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+ return true;
+}
+
+static inline void __xen_set_pte(pte_t *ptep, pte_t pteval)
+{
+ if (!xen_batched_set_pte(ptep, pteval)) {
+ /*
+ * Could call native_set_pte() here and trap and
+ * emulate the PTE write but with 32-bit guests this
+ * needs two traps (one for each of the two 32-bit
+ * words in the PTE) so do one hypercall directly
+ * instead.
+ */
+ struct mmu_update u;
+
+ u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
+ u.val = pte_val_ma(pteval);
+ HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF);
+ }
+}
+
+static void xen_set_pte(pte_t *ptep, pte_t pteval)
+{
+ trace_xen_mmu_set_pte(ptep, pteval);
+ __xen_set_pte(ptep, pteval);
+}
+
+static void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pteval)
+{
+ trace_xen_mmu_set_pte_at(mm, addr, ptep, pteval);
+ __xen_set_pte(ptep, pteval);
+}
+
+pte_t xen_ptep_modify_prot_start(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
+{
+ /* Just return the pte as-is. We preserve the bits on commit */
+ trace_xen_mmu_ptep_modify_prot_start(mm, addr, ptep, *ptep);
+ return *ptep;
+}
+
+void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte)
+{
+ struct mmu_update u;
+
+ trace_xen_mmu_ptep_modify_prot_commit(mm, addr, ptep, pte);
+ xen_mc_batch();
+
+ u.ptr = virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD;
+ u.val = pte_val_ma(pte);
+ xen_extend_mmu_update(&u);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+}
+
+/* Assume pteval_t is equivalent to all the other *val_t types. */
+static pteval_t pte_mfn_to_pfn(pteval_t val)
+{
+ if (val & _PAGE_PRESENT) {
+ unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
+ unsigned long pfn = mfn_to_pfn(mfn);
+
+ pteval_t flags = val & PTE_FLAGS_MASK;
+ if (unlikely(pfn == ~0))
+ val = flags & ~_PAGE_PRESENT;
+ else
+ val = ((pteval_t)pfn << PAGE_SHIFT) | flags;
+ }
+
+ return val;
+}
+
+static pteval_t pte_pfn_to_mfn(pteval_t val)
+{
+ if (val & _PAGE_PRESENT) {
+ unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
+ pteval_t flags = val & PTE_FLAGS_MASK;
+ unsigned long mfn;
+
+ if (!xen_feature(XENFEAT_auto_translated_physmap))
+ mfn = __pfn_to_mfn(pfn);
+ else
+ mfn = pfn;
+ /*
+ * If there's no mfn for the pfn, then just create an
+ * empty non-present pte. Unfortunately this loses
+ * information about the original pfn, so
+ * pte_mfn_to_pfn is asymmetric.
+ */
+ if (unlikely(mfn == INVALID_P2M_ENTRY)) {
+ mfn = 0;
+ flags = 0;
+ } else
+ mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
+ val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
+ }
+
+ return val;
+}
+
+__visible pteval_t xen_pte_val(pte_t pte)
+{
+ pteval_t pteval = pte.pte;
+
+ return pte_mfn_to_pfn(pteval);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
+
+__visible pgdval_t xen_pgd_val(pgd_t pgd)
+{
+ return pte_mfn_to_pfn(pgd.pgd);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
+
+__visible pte_t xen_make_pte(pteval_t pte)
+{
+ pte = pte_pfn_to_mfn(pte);
+
+ return native_make_pte(pte);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
+
+__visible pgd_t xen_make_pgd(pgdval_t pgd)
+{
+ pgd = pte_pfn_to_mfn(pgd);
+ return native_make_pgd(pgd);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pgd);
+
+__visible pmdval_t xen_pmd_val(pmd_t pmd)
+{
+ return pte_mfn_to_pfn(pmd.pmd);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pmd_val);
+
+static void xen_set_pud_hyper(pud_t *ptr, pud_t val)
+{
+ struct mmu_update u;
+
+ preempt_disable();
+
+ xen_mc_batch();
+
+ /* ptr may be ioremapped for 64-bit pagetable setup */
+ u.ptr = arbitrary_virt_to_machine(ptr).maddr;
+ u.val = pud_val_ma(val);
+ xen_extend_mmu_update(&u);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+ preempt_enable();
+}
+
+static void xen_set_pud(pud_t *ptr, pud_t val)
+{
+ trace_xen_mmu_set_pud(ptr, val);
+
+ /* If page is not pinned, we can just update the entry
+ directly */
+ if (!xen_page_pinned(ptr)) {
+ *ptr = val;
+ return;
+ }
+
+ xen_set_pud_hyper(ptr, val);
+}
+
+#ifdef CONFIG_X86_PAE
+static void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
+{
+ trace_xen_mmu_set_pte_atomic(ptep, pte);
+ set_64bit((u64 *)ptep, native_pte_val(pte));
+}
+
+static void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+ trace_xen_mmu_pte_clear(mm, addr, ptep);
+ if (!xen_batched_set_pte(ptep, native_make_pte(0)))
+ native_pte_clear(mm, addr, ptep);
+}
+
+static void xen_pmd_clear(pmd_t *pmdp)
+{
+ trace_xen_mmu_pmd_clear(pmdp);
+ set_pmd(pmdp, __pmd(0));
+}
+#endif /* CONFIG_X86_PAE */
+
+__visible pmd_t xen_make_pmd(pmdval_t pmd)
+{
+ pmd = pte_pfn_to_mfn(pmd);
+ return native_make_pmd(pmd);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pmd);
+
+#if CONFIG_PGTABLE_LEVELS == 4
+__visible pudval_t xen_pud_val(pud_t pud)
+{
+ return pte_mfn_to_pfn(pud.pud);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_pud_val);
+
+__visible pud_t xen_make_pud(pudval_t pud)
+{
+ pud = pte_pfn_to_mfn(pud);
+
+ return native_make_pud(pud);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pud);
+
+static pgd_t *xen_get_user_pgd(pgd_t *pgd)
+{
+ pgd_t *pgd_page = (pgd_t *)(((unsigned long)pgd) & PAGE_MASK);
+ unsigned offset = pgd - pgd_page;
+ pgd_t *user_ptr = NULL;
+
+ if (offset < pgd_index(USER_LIMIT)) {
+ struct page *page = virt_to_page(pgd_page);
+ user_ptr = (pgd_t *)page->private;
+ if (user_ptr)
+ user_ptr += offset;
+ }
+
+ return user_ptr;
+}
+
+static void __xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
+{
+ struct mmu_update u;
+
+ u.ptr = virt_to_machine(ptr).maddr;
+ u.val = pgd_val_ma(val);
+ xen_extend_mmu_update(&u);
+}
+
+/*
+ * Raw hypercall-based set_pgd, intended for in early boot before
+ * there's a page structure. This implies:
+ * 1. The only existing pagetable is the kernel's
+ * 2. It is always pinned
+ * 3. It has no user pagetable attached to it
+ */
+static void __init xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
+{
+ preempt_disable();
+
+ xen_mc_batch();
+
+ __xen_set_pgd_hyper(ptr, val);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+ preempt_enable();
+}
+
+static void xen_set_pgd(pgd_t *ptr, pgd_t val)
+{
+ pgd_t *user_ptr = xen_get_user_pgd(ptr);
+
+ trace_xen_mmu_set_pgd(ptr, user_ptr, val);
+
+ /* If page is not pinned, we can just update the entry
+ directly */
+ if (!xen_page_pinned(ptr)) {
+ *ptr = val;
+ if (user_ptr) {
+ WARN_ON(xen_page_pinned(user_ptr));
+ *user_ptr = val;
+ }
+ return;
+ }
+
+ /* If it's pinned, then we can at least batch the kernel and
+ user updates together. */
+ xen_mc_batch();
+
+ __xen_set_pgd_hyper(ptr, val);
+ if (user_ptr)
+ __xen_set_pgd_hyper(user_ptr, val);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+}
+#endif /* CONFIG_PGTABLE_LEVELS == 4 */
+
+/*
+ * (Yet another) pagetable walker. This one is intended for pinning a
+ * pagetable. This means that it walks a pagetable and calls the
+ * callback function on each page it finds making up the page table,
+ * at every level. It walks the entire pagetable, but it only bothers
+ * pinning pte pages which are below limit. In the normal case this
+ * will be STACK_TOP_MAX, but at boot we need to pin up to
+ * FIXADDR_TOP.
+ *
+ * For 32-bit the important bit is that we don't pin beyond there,
+ * because then we start getting into Xen's ptes.
+ *
+ * For 64-bit, we must skip the Xen hole in the middle of the address
+ * space, just after the big x86-64 virtual hole.
+ */
+static int __xen_pgd_walk(struct mm_struct *mm, pgd_t *pgd,
+ int (*func)(struct mm_struct *mm, struct page *,
+ enum pt_level),
+ unsigned long limit)
+{
+ int flush = 0;
+ unsigned hole_low, hole_high;
+ unsigned pgdidx_limit, pudidx_limit, pmdidx_limit;
+ unsigned pgdidx, pudidx, pmdidx;
+
+ /* The limit is the last byte to be touched */
+ limit--;
+ BUG_ON(limit >= FIXADDR_TOP);
+
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 0;
+
+ /*
+ * 64-bit has a great big hole in the middle of the address
+ * space, which contains the Xen mappings. On 32-bit these
+ * will end up making a zero-sized hole and so is a no-op.
+ */
+ hole_low = pgd_index(USER_LIMIT);
+ hole_high = pgd_index(PAGE_OFFSET);
+
+ pgdidx_limit = pgd_index(limit);
+#if PTRS_PER_PUD > 1
+ pudidx_limit = pud_index(limit);
+#else
+ pudidx_limit = 0;
+#endif
+#if PTRS_PER_PMD > 1
+ pmdidx_limit = pmd_index(limit);
+#else
+ pmdidx_limit = 0;
+#endif
+
+ for (pgdidx = 0; pgdidx <= pgdidx_limit; pgdidx++) {
+ pud_t *pud;
+
+ if (pgdidx >= hole_low && pgdidx < hole_high)
+ continue;
+
+ if (!pgd_val(pgd[pgdidx]))
+ continue;
+
+ pud = pud_offset(&pgd[pgdidx], 0);
+
+ if (PTRS_PER_PUD > 1) /* not folded */
+ flush |= (*func)(mm, virt_to_page(pud), PT_PUD);
+
+ for (pudidx = 0; pudidx < PTRS_PER_PUD; pudidx++) {
+ pmd_t *pmd;
+
+ if (pgdidx == pgdidx_limit &&
+ pudidx > pudidx_limit)
+ goto out;
+
+ if (pud_none(pud[pudidx]))
+ continue;
+
+ pmd = pmd_offset(&pud[pudidx], 0);
+
+ if (PTRS_PER_PMD > 1) /* not folded */
+ flush |= (*func)(mm, virt_to_page(pmd), PT_PMD);
+
+ for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++) {
+ struct page *pte;
+
+ if (pgdidx == pgdidx_limit &&
+ pudidx == pudidx_limit &&
+ pmdidx > pmdidx_limit)
+ goto out;
+
+ if (pmd_none(pmd[pmdidx]))
+ continue;
+
+ pte = pmd_page(pmd[pmdidx]);
+ flush |= (*func)(mm, pte, PT_PTE);
+ }
+ }
+ }
+
+out:
+ /* Do the top level last, so that the callbacks can use it as
+ a cue to do final things like tlb flushes. */
+ flush |= (*func)(mm, virt_to_page(pgd), PT_PGD);
+
+ return flush;
+}
+
+static int xen_pgd_walk(struct mm_struct *mm,
+ int (*func)(struct mm_struct *mm, struct page *,
+ enum pt_level),
+ unsigned long limit)
+{
+ return __xen_pgd_walk(mm, mm->pgd, func, limit);
+}
+
+/* If we're using split pte locks, then take the page's lock and
+ return a pointer to it. Otherwise return NULL. */
+static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
+{
+ spinlock_t *ptl = NULL;
+
+#if USE_SPLIT_PTE_PTLOCKS
+ ptl = ptlock_ptr(page);
+ spin_lock_nest_lock(ptl, &mm->page_table_lock);
+#endif
+
+ return ptl;
+}
+
+static void xen_pte_unlock(void *v)
+{
+ spinlock_t *ptl = v;
+ spin_unlock(ptl);
+}
+
+static void xen_do_pin(unsigned level, unsigned long pfn)
+{
+ struct mmuext_op op;
+
+ op.cmd = level;
+ op.arg1.mfn = pfn_to_mfn(pfn);
+
+ xen_extend_mmuext_op(&op);
+}
+
+static int xen_pin_page(struct mm_struct *mm, struct page *page,
+ enum pt_level level)
+{
+ unsigned pgfl = TestSetPagePinned(page);
+ int flush;
+
+ if (pgfl)
+ flush = 0; /* already pinned */
+ else if (PageHighMem(page))
+ /* kmaps need flushing if we found an unpinned
+ highpage */
+ flush = 1;
+ else {
+ void *pt = lowmem_page_address(page);
+ unsigned long pfn = page_to_pfn(page);
+ struct multicall_space mcs = __xen_mc_entry(0);
+ spinlock_t *ptl;
+
+ flush = 0;
+
+ /*
+ * We need to hold the pagetable lock between the time
+ * we make the pagetable RO and when we actually pin
+ * it. If we don't, then other users may come in and
+ * attempt to update the pagetable by writing it,
+ * which will fail because the memory is RO but not
+ * pinned, so Xen won't do the trap'n'emulate.
+ *
+ * If we're using split pte locks, we can't hold the
+ * entire pagetable's worth of locks during the
+ * traverse, because we may wrap the preempt count (8
+ * bits). The solution is to mark RO and pin each PTE
+ * page while holding the lock. This means the number
+ * of locks we end up holding is never more than a
+ * batch size (~32 entries, at present).
+ *
+ * If we're not using split pte locks, we needn't pin
+ * the PTE pages independently, because we're
+ * protected by the overall pagetable lock.
+ */
+ ptl = NULL;
+ if (level == PT_PTE)
+ ptl = xen_pte_lock(page, mm);
+
+ MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
+ pfn_pte(pfn, PAGE_KERNEL_RO),
+ level == PT_PGD ? UVMF_TLB_FLUSH : 0);
+
+ if (ptl) {
+ xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn);
+
+ /* Queue a deferred unlock for when this batch
+ is completed. */
+ xen_mc_callback(xen_pte_unlock, ptl);
+ }
+ }
+
+ return flush;
+}
+
+/* This is called just after a mm has been created, but it has not
+ been used yet. We need to make sure that its pagetable is all
+ read-only, and can be pinned. */
+static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
+{
+ trace_xen_mmu_pgd_pin(mm, pgd);
+
+ xen_mc_batch();
+
+ if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
+ /* re-enable interrupts for flushing */
+ xen_mc_issue(0);
+
+ kmap_flush_unused();
+
+ xen_mc_batch();
+ }
+
+#ifdef CONFIG_X86_64
+ {
+ pgd_t *user_pgd = xen_get_user_pgd(pgd);
+
+ xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(pgd)));
+
+ if (user_pgd) {
+ xen_pin_page(mm, virt_to_page(user_pgd), PT_PGD);
+ xen_do_pin(MMUEXT_PIN_L4_TABLE,
+ PFN_DOWN(__pa(user_pgd)));
+ }
+ }
+#else /* CONFIG_X86_32 */
+#ifdef CONFIG_X86_PAE
+ /* Need to make sure unshared kernel PMD is pinnable */
+ xen_pin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
+ PT_PMD);
+#endif
+ xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
+#endif /* CONFIG_X86_64 */
+ xen_mc_issue(0);
+}
+
+static void xen_pgd_pin(struct mm_struct *mm)
+{
+ __xen_pgd_pin(mm, mm->pgd);
+}
+
+/*
+ * On save, we need to pin all pagetables to make sure they get their
+ * mfns turned into pfns. Search the list for any unpinned pgds and pin
+ * them (unpinned pgds are not currently in use, probably because the
+ * process is under construction or destruction).
+ *
+ * Expected to be called in stop_machine() ("equivalent to taking
+ * every spinlock in the system"), so the locking doesn't really
+ * matter all that much.
+ */
+void xen_mm_pin_all(void)
+{
+ struct page *page;
+
+ spin_lock(&pgd_lock);
+
+ list_for_each_entry(page, &pgd_list, lru) {
+ if (!PagePinned(page)) {
+ __xen_pgd_pin(&init_mm, (pgd_t *)page_address(page));
+ SetPageSavePinned(page);
+ }
+ }
+
+ spin_unlock(&pgd_lock);
+}
+
+/*
+ * The init_mm pagetable is really pinned as soon as its created, but
+ * that's before we have page structures to store the bits. So do all
+ * the book-keeping now.
+ */
+static int __init xen_mark_pinned(struct mm_struct *mm, struct page *page,
+ enum pt_level level)
+{
+ SetPagePinned(page);
+ return 0;
+}
+
+static void __init xen_mark_init_mm_pinned(void)
+{
+ xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
+}
+
+static int xen_unpin_page(struct mm_struct *mm, struct page *page,
+ enum pt_level level)
+{
+ unsigned pgfl = TestClearPagePinned(page);
+
+ if (pgfl && !PageHighMem(page)) {
+ void *pt = lowmem_page_address(page);
+ unsigned long pfn = page_to_pfn(page);
+ spinlock_t *ptl = NULL;
+ struct multicall_space mcs;
+
+ /*
+ * Do the converse to pin_page. If we're using split
+ * pte locks, we must be holding the lock for while
+ * the pte page is unpinned but still RO to prevent
+ * concurrent updates from seeing it in this
+ * partially-pinned state.
+ */
+ if (level == PT_PTE) {
+ ptl = xen_pte_lock(page, mm);
+
+ if (ptl)
+ xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
+ }
+
+ mcs = __xen_mc_entry(0);
+
+ MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
+ pfn_pte(pfn, PAGE_KERNEL),
+ level == PT_PGD ? UVMF_TLB_FLUSH : 0);
+
+ if (ptl) {
+ /* unlock when batch completed */
+ xen_mc_callback(xen_pte_unlock, ptl);
+ }
+ }
+
+ return 0; /* never need to flush on unpin */
+}
+
+/* Release a pagetables pages back as normal RW */
+static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
+{
+ trace_xen_mmu_pgd_unpin(mm, pgd);
+
+ xen_mc_batch();
+
+ xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
+
+#ifdef CONFIG_X86_64
+ {
+ pgd_t *user_pgd = xen_get_user_pgd(pgd);
+
+ if (user_pgd) {
+ xen_do_pin(MMUEXT_UNPIN_TABLE,
+ PFN_DOWN(__pa(user_pgd)));
+ xen_unpin_page(mm, virt_to_page(user_pgd), PT_PGD);
+ }
+ }
+#endif
+
+#ifdef CONFIG_X86_PAE
+ /* Need to make sure unshared kernel PMD is unpinned */
+ xen_unpin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
+ PT_PMD);
+#endif
+
+ __xen_pgd_walk(mm, pgd, xen_unpin_page, USER_LIMIT);
+
+ xen_mc_issue(0);
+}
+
+static void xen_pgd_unpin(struct mm_struct *mm)
+{
+ __xen_pgd_unpin(mm, mm->pgd);
+}
+
+/*
+ * On resume, undo any pinning done at save, so that the rest of the
+ * kernel doesn't see any unexpected pinned pagetables.
+ */
+void xen_mm_unpin_all(void)
+{
+ struct page *page;
+
+ spin_lock(&pgd_lock);
+
+ list_for_each_entry(page, &pgd_list, lru) {
+ if (PageSavePinned(page)) {
+ BUG_ON(!PagePinned(page));
+ __xen_pgd_unpin(&init_mm, (pgd_t *)page_address(page));
+ ClearPageSavePinned(page);
+ }
+ }
+
+ spin_unlock(&pgd_lock);
+}
+
+static void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+ spin_lock(&next->page_table_lock);
+ xen_pgd_pin(next);
+ spin_unlock(&next->page_table_lock);
+}
+
+static void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
+{
+ spin_lock(&mm->page_table_lock);
+ xen_pgd_pin(mm);
+ spin_unlock(&mm->page_table_lock);
+}
+
+
+#ifdef CONFIG_SMP
+/* Another cpu may still have their %cr3 pointing at the pagetable, so
+ we need to repoint it somewhere else before we can unpin it. */
+static void drop_other_mm_ref(void *info)
+{
+ struct mm_struct *mm = info;
+ struct mm_struct *active_mm;
+
+ active_mm = this_cpu_read(cpu_tlbstate.active_mm);
+
+ if (active_mm == mm && this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
+ leave_mm(smp_processor_id());
+
+ /* If this cpu still has a stale cr3 reference, then make sure
+ it has been flushed. */
+ if (this_cpu_read(xen_current_cr3) == __pa(mm->pgd))
+ load_cr3(swapper_pg_dir);
+}
+
+static void xen_drop_mm_ref(struct mm_struct *mm)
+{
+ cpumask_var_t mask;
+ unsigned cpu;
+
+ if (current->active_mm == mm) {
+ if (current->mm == mm)
+ load_cr3(swapper_pg_dir);
+ else
+ leave_mm(smp_processor_id());
+ }
+
+ /* Get the "official" set of cpus referring to our pagetable. */
+ if (!alloc_cpumask_var(&mask, GFP_ATOMIC)) {
+ for_each_online_cpu(cpu) {
+ if (!cpumask_test_cpu(cpu, mm_cpumask(mm))
+ && per_cpu(xen_current_cr3, cpu) != __pa(mm->pgd))
+ continue;
+ smp_call_function_single(cpu, drop_other_mm_ref, mm, 1);
+ }
+ return;
+ }
+ cpumask_copy(mask, mm_cpumask(mm));
+
+ /* It's possible that a vcpu may have a stale reference to our
+ cr3, because its in lazy mode, and it hasn't yet flushed
+ its set of pending hypercalls yet. In this case, we can
+ look at its actual current cr3 value, and force it to flush
+ if needed. */
+ for_each_online_cpu(cpu) {
+ if (per_cpu(xen_current_cr3, cpu) == __pa(mm->pgd))
+ cpumask_set_cpu(cpu, mask);
+ }
+
+ if (!cpumask_empty(mask))
+ smp_call_function_many(mask, drop_other_mm_ref, mm, 1);
+ free_cpumask_var(mask);
+}
+#else
+static void xen_drop_mm_ref(struct mm_struct *mm)
+{
+ if (current->active_mm == mm)
+ load_cr3(swapper_pg_dir);
+}
+#endif
+
+/*
+ * While a process runs, Xen pins its pagetables, which means that the
+ * hypervisor forces it to be read-only, and it controls all updates
+ * to it. This means that all pagetable updates have to go via the
+ * hypervisor, which is moderately expensive.
+ *
+ * Since we're pulling the pagetable down, we switch to use init_mm,
+ * unpin old process pagetable and mark it all read-write, which
+ * allows further operations on it to be simple memory accesses.
+ *
+ * The only subtle point is that another CPU may be still using the
+ * pagetable because of lazy tlb flushing. This means we need need to
+ * switch all CPUs off this pagetable before we can unpin it.
+ */
+static void xen_exit_mmap(struct mm_struct *mm)
+{
+ get_cpu(); /* make sure we don't move around */
+ xen_drop_mm_ref(mm);
+ put_cpu();
+
+ spin_lock(&mm->page_table_lock);
+
+ /* pgd may not be pinned in the error exit path of execve */
+ if (xen_page_pinned(mm->pgd))
+ xen_pgd_unpin(mm);
+
+ spin_unlock(&mm->page_table_lock);
+}
+
+static void xen_post_allocator_init(void);
+
+static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
+{
+ struct mmuext_op op;
+
+ op.cmd = cmd;
+ op.arg1.mfn = pfn_to_mfn(pfn);
+ if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
+ BUG();
+}
+
+#ifdef CONFIG_X86_64
+static void __init xen_cleanhighmap(unsigned long vaddr,
+ unsigned long vaddr_end)
+{
+ unsigned long kernel_end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
+ pmd_t *pmd = level2_kernel_pgt + pmd_index(vaddr);
+
+ /* NOTE: The loop is more greedy than the cleanup_highmap variant.
+ * We include the PMD passed in on _both_ boundaries. */
+ for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PTRS_PER_PMD));
+ pmd++, vaddr += PMD_SIZE) {
+ if (pmd_none(*pmd))
+ continue;
+ if (vaddr < (unsigned long) _text || vaddr > kernel_end)
+ set_pmd(pmd, __pmd(0));
+ }
+ /* In case we did something silly, we should crash in this function
+ * instead of somewhere later and be confusing. */
+ xen_mc_flush();
+}
+
+/*
+ * Make a page range writeable and free it.
+ */
+static void __init xen_free_ro_pages(unsigned long paddr, unsigned long size)
+{
+ void *vaddr = __va(paddr);
+ void *vaddr_end = vaddr + size;
+
+ for (; vaddr < vaddr_end; vaddr += PAGE_SIZE)
+ make_lowmem_page_readwrite(vaddr);
+
+ memblock_free(paddr, size);
+}
+
+static void __init xen_cleanmfnmap_free_pgtbl(void *pgtbl, bool unpin)
+{
+ unsigned long pa = __pa(pgtbl) & PHYSICAL_PAGE_MASK;
+
+ if (unpin)
+ pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(pa));
+ ClearPagePinned(virt_to_page(__va(pa)));
+ xen_free_ro_pages(pa, PAGE_SIZE);
+}
+
+/*
+ * Since it is well isolated we can (and since it is perhaps large we should)
+ * also free the page tables mapping the initial P->M table.
+ */
+static void __init xen_cleanmfnmap(unsigned long vaddr)
+{
+ unsigned long va = vaddr & PMD_MASK;
+ unsigned long pa;
+ pgd_t *pgd = pgd_offset_k(va);
+ pud_t *pud_page = pud_offset(pgd, 0);
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned int i;
+ bool unpin;
+
+ unpin = (vaddr == 2 * PGDIR_SIZE);
+ set_pgd(pgd, __pgd(0));
+ do {
+ pud = pud_page + pud_index(va);
+ if (pud_none(*pud)) {
+ va += PUD_SIZE;
+ } else if (pud_large(*pud)) {
+ pa = pud_val(*pud) & PHYSICAL_PAGE_MASK;
+ xen_free_ro_pages(pa, PUD_SIZE);
+ va += PUD_SIZE;
+ } else {
+ pmd = pmd_offset(pud, va);
+ if (pmd_large(*pmd)) {
+ pa = pmd_val(*pmd) & PHYSICAL_PAGE_MASK;
+ xen_free_ro_pages(pa, PMD_SIZE);
+ } else if (!pmd_none(*pmd)) {
+ pte = pte_offset_kernel(pmd, va);
+ set_pmd(pmd, __pmd(0));
+ for (i = 0; i < PTRS_PER_PTE; ++i) {
+ if (pte_none(pte[i]))
+ break;
+ pa = pte_pfn(pte[i]) << PAGE_SHIFT;
+ xen_free_ro_pages(pa, PAGE_SIZE);
+ }
+ xen_cleanmfnmap_free_pgtbl(pte, unpin);
+ }
+ va += PMD_SIZE;
+ if (pmd_index(va))
+ continue;
+ set_pud(pud, __pud(0));
+ xen_cleanmfnmap_free_pgtbl(pmd, unpin);
+ }
+
+ } while (pud_index(va) || pmd_index(va));
+ xen_cleanmfnmap_free_pgtbl(pud_page, unpin);
+}
+
+static void __init xen_pagetable_p2m_free(void)
+{
+ unsigned long size;
+ unsigned long addr;
+
+ size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
+
+ /* No memory or already called. */
+ if ((unsigned long)xen_p2m_addr == xen_start_info->mfn_list)
+ return;
+
+ /* using __ka address and sticking INVALID_P2M_ENTRY! */
+ memset((void *)xen_start_info->mfn_list, 0xff, size);
+
+ addr = xen_start_info->mfn_list;
+ /*
+ * We could be in __ka space.
+ * We roundup to the PMD, which means that if anybody at this stage is
+ * using the __ka address of xen_start_info or
+ * xen_start_info->shared_info they are in going to crash. Fortunatly
+ * we have already revectored in xen_setup_kernel_pagetable and in
+ * xen_setup_shared_info.
+ */
+ size = roundup(size, PMD_SIZE);
+
+ if (addr >= __START_KERNEL_map) {
+ xen_cleanhighmap(addr, addr + size);
+ size = PAGE_ALIGN(xen_start_info->nr_pages *
+ sizeof(unsigned long));
+ memblock_free(__pa(addr), size);
+ } else {
+ xen_cleanmfnmap(addr);
+ }
+}
+
+static void __init xen_pagetable_cleanhighmap(void)
+{
+ unsigned long size;
+ unsigned long addr;
+
+ /* At this stage, cleanup_highmap has already cleaned __ka space
+ * from _brk_limit way up to the max_pfn_mapped (which is the end of
+ * the ramdisk). We continue on, erasing PMD entries that point to page
+ * tables - do note that they are accessible at this stage via __va.
+ * For good measure we also round up to the PMD - which means that if
+ * anybody is using __ka address to the initial boot-stack - and try
+ * to use it - they are going to crash. The xen_start_info has been
+ * taken care of already in xen_setup_kernel_pagetable. */
+ addr = xen_start_info->pt_base;
+ size = roundup(xen_start_info->nr_pt_frames * PAGE_SIZE, PMD_SIZE);
+
+ xen_cleanhighmap(addr, addr + size);
+ xen_start_info->pt_base = (unsigned long)__va(__pa(xen_start_info->pt_base));
+#ifdef DEBUG
+ /* This is superfluous and is not necessary, but you know what
+ * lets do it. The MODULES_VADDR -> MODULES_END should be clear of
+ * anything at this stage. */
+ xen_cleanhighmap(MODULES_VADDR, roundup(MODULES_VADDR, PUD_SIZE) - 1);
+#endif
+}
+#endif
+
+static void __init xen_pagetable_p2m_setup(void)
+{
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return;
+
+ xen_vmalloc_p2m_tree();
+
+#ifdef CONFIG_X86_64
+ xen_pagetable_p2m_free();
+
+ xen_pagetable_cleanhighmap();
+#endif
+ /* And revector! Bye bye old array */
+ xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
+}
+
+static void __init xen_pagetable_init(void)
+{
+ paging_init();
+ xen_post_allocator_init();
+
+ xen_pagetable_p2m_setup();
+
+ /* Allocate and initialize top and mid mfn levels for p2m structure */
+ xen_build_mfn_list_list();
+
+ /* Remap memory freed due to conflicts with E820 map */
+ if (!xen_feature(XENFEAT_auto_translated_physmap))
+ xen_remap_memory();
+
+ xen_setup_shared_info();
+}
+static void xen_write_cr2(unsigned long cr2)
+{
+ this_cpu_read(xen_vcpu)->arch.cr2 = cr2;
+}
+
+static unsigned long xen_read_cr2(void)
+{
+ return this_cpu_read(xen_vcpu)->arch.cr2;
+}
+
+unsigned long xen_read_cr2_direct(void)
+{
+ return this_cpu_read(xen_vcpu_info.arch.cr2);
+}
+
+static void xen_flush_tlb(void)
+{
+ struct mmuext_op *op;
+ struct multicall_space mcs;
+
+ trace_xen_mmu_flush_tlb(0);
+
+ preempt_disable();
+
+ mcs = xen_mc_entry(sizeof(*op));
+
+ op = mcs.args;
+ op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
+ MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+ preempt_enable();
+}
+
+static void xen_flush_tlb_single(unsigned long addr)
+{
+ struct mmuext_op *op;
+ struct multicall_space mcs;
+
+ trace_xen_mmu_flush_tlb_single(addr);
+
+ preempt_disable();
+
+ mcs = xen_mc_entry(sizeof(*op));
+ op = mcs.args;
+ op->cmd = MMUEXT_INVLPG_LOCAL;
+ op->arg1.linear_addr = addr & PAGE_MASK;
+ MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+
+ preempt_enable();
+}
+
+static void xen_flush_tlb_others(const struct cpumask *cpus,
+ struct mm_struct *mm, unsigned long start,
+ unsigned long end)
+{
+ struct {
+ struct mmuext_op op;
+#ifdef CONFIG_SMP
+ DECLARE_BITMAP(mask, num_processors);
+#else
+ DECLARE_BITMAP(mask, NR_CPUS);
+#endif
+ } *args;
+ struct multicall_space mcs;
+
+ trace_xen_mmu_flush_tlb_others(cpus, mm, start, end);
+
+ if (cpumask_empty(cpus))
+ return; /* nothing to do */
+
+ mcs = xen_mc_entry(sizeof(*args));
+ args = mcs.args;
+ args->op.arg2.vcpumask = to_cpumask(args->mask);
+
+ /* Remove us, and any offline CPUS. */
+ cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
+ cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
+
+ args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
+ if (end != TLB_FLUSH_ALL && (end - start) <= PAGE_SIZE) {
+ args->op.cmd = MMUEXT_INVLPG_MULTI;
+ args->op.arg1.linear_addr = start;
+ }
+
+ MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+}
+
+static unsigned long xen_read_cr3(void)
+{
+ return this_cpu_read(xen_cr3);
+}
+
+static void set_current_cr3(void *v)
+{
+ this_cpu_write(xen_current_cr3, (unsigned long)v);
+}
+
+static void __xen_write_cr3(bool kernel, unsigned long cr3)
+{
+ struct mmuext_op op;
+ unsigned long mfn;
+
+ trace_xen_mmu_write_cr3(kernel, cr3);
+
+ if (cr3)
+ mfn = pfn_to_mfn(PFN_DOWN(cr3));
+ else
+ mfn = 0;
+
+ WARN_ON(mfn == 0 && kernel);
+
+ op.cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
+ op.arg1.mfn = mfn;
+
+ xen_extend_mmuext_op(&op);
+
+ if (kernel) {
+ this_cpu_write(xen_cr3, cr3);
+
+ /* Update xen_current_cr3 once the batch has actually
+ been submitted. */
+ xen_mc_callback(set_current_cr3, (void *)cr3);
+ }
+}
+static void xen_write_cr3(unsigned long cr3)
+{
+ BUG_ON(preemptible());
+
+ xen_mc_batch(); /* disables interrupts */
+
+ /* Update while interrupts are disabled, so its atomic with
+ respect to ipis */
+ this_cpu_write(xen_cr3, cr3);
+
+ __xen_write_cr3(true, cr3);
+
+#ifdef CONFIG_X86_64
+ {
+ pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
+ if (user_pgd)
+ __xen_write_cr3(false, __pa(user_pgd));
+ else
+ __xen_write_cr3(false, 0);
+ }
+#endif
+
+ xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
+}
+
+#ifdef CONFIG_X86_64
+/*
+ * At the start of the day - when Xen launches a guest, it has already
+ * built pagetables for the guest. We diligently look over them
+ * in xen_setup_kernel_pagetable and graft as appropriate them in the
+ * init_level4_pgt and its friends. Then when we are happy we load
+ * the new init_level4_pgt - and continue on.
+ *
+ * The generic code starts (start_kernel) and 'init_mem_mapping' sets
+ * up the rest of the pagetables. When it has completed it loads the cr3.
+ * N.B. that baremetal would start at 'start_kernel' (and the early
+ * #PF handler would create bootstrap pagetables) - so we are running
+ * with the same assumptions as what to do when write_cr3 is executed
+ * at this point.
+ *
+ * Since there are no user-page tables at all, we have two variants
+ * of xen_write_cr3 - the early bootup (this one), and the late one
+ * (xen_write_cr3). The reason we have to do that is that in 64-bit
+ * the Linux kernel and user-space are both in ring 3 while the
+ * hypervisor is in ring 0.
+ */
+static void __init xen_write_cr3_init(unsigned long cr3)
+{
+ BUG_ON(preemptible());
+
+ xen_mc_batch(); /* disables interrupts */
+
+ /* Update while interrupts are disabled, so its atomic with
+ respect to ipis */
+ this_cpu_write(xen_cr3, cr3);
+
+ __xen_write_cr3(true, cr3);
+
+ xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
+}
+#endif
+
+static int xen_pgd_alloc(struct mm_struct *mm)
+{
+ pgd_t *pgd = mm->pgd;
+ int ret = 0;
+
+ BUG_ON(PagePinned(virt_to_page(pgd)));
+
+#ifdef CONFIG_X86_64
+ {
+ struct page *page = virt_to_page(pgd);
+ pgd_t *user_pgd;
+
+ BUG_ON(page->private != 0);
+
+ ret = -ENOMEM;
+
+ user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
+ page->private = (unsigned long)user_pgd;
+
+ if (user_pgd != NULL) {
+#ifdef CONFIG_X86_VSYSCALL_EMULATION
+ user_pgd[pgd_index(VSYSCALL_ADDR)] =
+ __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
+#endif
+ ret = 0;
+ }
+
+ BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
+ }
+#endif
+
+ return ret;
+}
+
+static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+#ifdef CONFIG_X86_64
+ pgd_t *user_pgd = xen_get_user_pgd(pgd);
+
+ if (user_pgd)
+ free_page((unsigned long)user_pgd);
+#endif
+}
+
+/*
+ * Init-time set_pte while constructing initial pagetables, which
+ * doesn't allow RO page table pages to be remapped RW.
+ *
+ * If there is no MFN for this PFN then this page is initially
+ * ballooned out so clear the PTE (as in decrease_reservation() in
+ * drivers/xen/balloon.c).
+ *
+ * Many of these PTE updates are done on unpinned and writable pages
+ * and doing a hypercall for these is unnecessary and expensive. At
+ * this point it is not possible to tell if a page is pinned or not,
+ * so always write the PTE directly and rely on Xen trapping and
+ * emulating any updates as necessary.
+ */
+__visible pte_t xen_make_pte_init(pteval_t pte)
+{
+#ifdef CONFIG_X86_64
+ unsigned long pfn;
+
+ /*
+ * Pages belonging to the initial p2m list mapped outside the default
+ * address range must be mapped read-only. This region contains the
+ * page tables for mapping the p2m list, too, and page tables MUST be
+ * mapped read-only.
+ */
+ pfn = (pte & PTE_PFN_MASK) >> PAGE_SHIFT;
+ if (xen_start_info->mfn_list < __START_KERNEL_map &&
+ pfn >= xen_start_info->first_p2m_pfn &&
+ pfn < xen_start_info->first_p2m_pfn + xen_start_info->nr_p2m_frames)
+ pte &= ~_PAGE_RW;
+#endif
+ pte = pte_pfn_to_mfn(pte);
+ return native_make_pte(pte);
+}
+PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte_init);
+
+static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
+{
+#ifdef CONFIG_X86_32
+ /* If there's an existing pte, then don't allow _PAGE_RW to be set */
+ if (pte_mfn(pte) != INVALID_P2M_ENTRY
+ && pte_val_ma(*ptep) & _PAGE_PRESENT)
+ pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
+ pte_val_ma(pte));
+#endif
+ native_set_pte(ptep, pte);
+}
+
+/* Early in boot, while setting up the initial pagetable, assume
+ everything is pinned. */
+static void __init xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
+{
+#ifdef CONFIG_FLATMEM
+ BUG_ON(mem_map); /* should only be used early */
+#endif
+ make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
+ pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
+}
+
+/* Used for pmd and pud */
+static void __init xen_alloc_pmd_init(struct mm_struct *mm, unsigned long pfn)
+{
+#ifdef CONFIG_FLATMEM
+ BUG_ON(mem_map); /* should only be used early */
+#endif
+ make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
+}
+
+/* Early release_pte assumes that all pts are pinned, since there's
+ only init_mm and anything attached to that is pinned. */
+static void __init xen_release_pte_init(unsigned long pfn)
+{
+ pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
+ make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
+}
+
+static void __init xen_release_pmd_init(unsigned long pfn)
+{
+ make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
+}
+
+static inline void __pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
+{
+ struct multicall_space mcs;
+ struct mmuext_op *op;
+
+ mcs = __xen_mc_entry(sizeof(*op));
+ op = mcs.args;
+ op->cmd = cmd;
+ op->arg1.mfn = pfn_to_mfn(pfn);
+
+ MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
+}
+
+static inline void __set_pfn_prot(unsigned long pfn, pgprot_t prot)
+{
+ struct multicall_space mcs;
+ unsigned long addr = (unsigned long)__va(pfn << PAGE_SHIFT);
+
+ mcs = __xen_mc_entry(0);
+ MULTI_update_va_mapping(mcs.mc, (unsigned long)addr,
+ pfn_pte(pfn, prot), 0);
+}
+
+/* This needs to make sure the new pte page is pinned iff its being
+ attached to a pinned pagetable. */
+static inline void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn,
+ unsigned level)
+{
+ bool pinned = PagePinned(virt_to_page(mm->pgd));
+
+ trace_xen_mmu_alloc_ptpage(mm, pfn, level, pinned);
+
+ if (pinned) {
+ struct page *page = pfn_to_page(pfn);
+
+ SetPagePinned(page);
+
+ if (!PageHighMem(page)) {
+ xen_mc_batch();
+
+ __set_pfn_prot(pfn, PAGE_KERNEL_RO);
+
+ if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
+ __pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+ } else {
+ /* make sure there are no stray mappings of
+ this page */
+ kmap_flush_unused();
+ }
+ }
+}
+
+static void xen_alloc_pte(struct mm_struct *mm, unsigned long pfn)
+{
+ xen_alloc_ptpage(mm, pfn, PT_PTE);
+}
+
+static void xen_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
+{
+ xen_alloc_ptpage(mm, pfn, PT_PMD);
+}
+
+/* This should never happen until we're OK to use struct page */
+static inline void xen_release_ptpage(unsigned long pfn, unsigned level)
+{
+ struct page *page = pfn_to_page(pfn);
+ bool pinned = PagePinned(page);
+
+ trace_xen_mmu_release_ptpage(pfn, level, pinned);
+
+ if (pinned) {
+ if (!PageHighMem(page)) {
+ xen_mc_batch();
+
+ if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
+ __pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
+
+ __set_pfn_prot(pfn, PAGE_KERNEL);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
+ }
+ ClearPagePinned(page);
+ }
+}
+
+static void xen_release_pte(unsigned long pfn)
+{
+ xen_release_ptpage(pfn, PT_PTE);
+}
+
+static void xen_release_pmd(unsigned long pfn)
+{
+ xen_release_ptpage(pfn, PT_PMD);
+}
+
+#if CONFIG_PGTABLE_LEVELS == 4
+static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
+{
+ xen_alloc_ptpage(mm, pfn, PT_PUD);
+}
+
+static void xen_release_pud(unsigned long pfn)
+{
+ xen_release_ptpage(pfn, PT_PUD);
+}
+#endif
+
+void __init xen_reserve_top(void)
+{
+#ifdef CONFIG_X86_32
+ unsigned long top = HYPERVISOR_VIRT_START;
+ struct xen_platform_parameters pp;
+
+ if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
+ top = pp.virt_start;
+
+ reserve_top_address(-top);
+#endif /* CONFIG_X86_32 */
+}
+
+/*
+ * Like __va(), but returns address in the kernel mapping (which is
+ * all we have until the physical memory mapping has been set up.
+ */
+static void * __init __ka(phys_addr_t paddr)
+{
+#ifdef CONFIG_X86_64
+ return (void *)(paddr + __START_KERNEL_map);
+#else
+ return __va(paddr);
+#endif
+}
+
+/* Convert a machine address to physical address */
+static unsigned long __init m2p(phys_addr_t maddr)
+{
+ phys_addr_t paddr;
+
+ maddr &= PTE_PFN_MASK;
+ paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
+
+ return paddr;
+}
+
+/* Convert a machine address to kernel virtual */
+static void * __init m2v(phys_addr_t maddr)
+{
+ return __ka(m2p(maddr));
+}
+
+/* Set the page permissions on an identity-mapped pages */
+static void __init set_page_prot_flags(void *addr, pgprot_t prot,
+ unsigned long flags)
+{
+ unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
+ pte_t pte = pfn_pte(pfn, prot);
+
+ if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
+ BUG();
+}
+static void __init set_page_prot(void *addr, pgprot_t prot)
+{
+ return set_page_prot_flags(addr, prot, UVMF_NONE);
+}
+#ifdef CONFIG_X86_32
+static void __init xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
+{
+ unsigned pmdidx, pteidx;
+ unsigned ident_pte;
+ unsigned long pfn;
+
+ level1_ident_pgt = extend_brk(sizeof(pte_t) * LEVEL1_IDENT_ENTRIES,
+ PAGE_SIZE);
+
+ ident_pte = 0;
+ pfn = 0;
+ for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
+ pte_t *pte_page;
+
+ /* Reuse or allocate a page of ptes */
+ if (pmd_present(pmd[pmdidx]))
+ pte_page = m2v(pmd[pmdidx].pmd);
+ else {
+ /* Check for free pte pages */
+ if (ident_pte == LEVEL1_IDENT_ENTRIES)
+ break;
+
+ pte_page = &level1_ident_pgt[ident_pte];
+ ident_pte += PTRS_PER_PTE;
+
+ pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
+ }
+
+ /* Install mappings */
+ for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
+ pte_t pte;
+
+ if (pfn > max_pfn_mapped)
+ max_pfn_mapped = pfn;
+
+ if (!pte_none(pte_page[pteidx]))
+ continue;
+
+ pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
+ pte_page[pteidx] = pte;
+ }
+ }
+
+ for (pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
+ set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
+
+ set_page_prot(pmd, PAGE_KERNEL_RO);
+}
+#endif
+void __init xen_setup_machphys_mapping(void)
+{
+ struct xen_machphys_mapping mapping;
+
+ if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
+ machine_to_phys_mapping = (unsigned long *)mapping.v_start;
+ machine_to_phys_nr = mapping.max_mfn + 1;
+ } else {
+ machine_to_phys_nr = MACH2PHYS_NR_ENTRIES;
+ }
+#ifdef CONFIG_X86_32
+ WARN_ON((machine_to_phys_mapping + (machine_to_phys_nr - 1))
+ < machine_to_phys_mapping);
+#endif
+}
+
+#ifdef CONFIG_X86_64
+static void __init convert_pfn_mfn(void *v)
+{
+ pte_t *pte = v;
+ int i;
+
+ /* All levels are converted the same way, so just treat them
+ as ptes. */
+ for (i = 0; i < PTRS_PER_PTE; i++)
+ pte[i] = xen_make_pte(pte[i].pte);
+}
+static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
+ unsigned long addr)
+{
+ if (*pt_base == PFN_DOWN(__pa(addr))) {
+ set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
+ clear_page((void *)addr);
+ (*pt_base)++;
+ }
+ if (*pt_end == PFN_DOWN(__pa(addr))) {
+ set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
+ clear_page((void *)addr);
+ (*pt_end)--;
+ }
+}
+/*
+ * Set up the initial kernel pagetable.
+ *
+ * We can construct this by grafting the Xen provided pagetable into
+ * head_64.S's preconstructed pagetables. We copy the Xen L2's into
+ * level2_ident_pgt, and level2_kernel_pgt. This means that only the
+ * kernel has a physical mapping to start with - but that's enough to
+ * get __va working. We need to fill in the rest of the physical
+ * mapping once some sort of allocator has been set up.
+ */
+void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
+{
+ pud_t *l3;
+ pmd_t *l2;
+ unsigned long addr[3];
+ unsigned long pt_base, pt_end;
+ unsigned i;
+
+ /* max_pfn_mapped is the last pfn mapped in the initial memory
+ * mappings. Considering that on Xen after the kernel mappings we
+ * have the mappings of some pages that don't exist in pfn space, we
+ * set max_pfn_mapped to the last real pfn mapped. */
+ if (xen_start_info->mfn_list < __START_KERNEL_map)
+ max_pfn_mapped = xen_start_info->first_p2m_pfn;
+ else
+ max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
+
+ pt_base = PFN_DOWN(__pa(xen_start_info->pt_base));
+ pt_end = pt_base + xen_start_info->nr_pt_frames;
+
+ /* Zap identity mapping */
+ init_level4_pgt[0] = __pgd(0);
+
+ if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ /* Pre-constructed entries are in pfn, so convert to mfn */
+ /* L4[272] -> level3_ident_pgt
+ * L4[511] -> level3_kernel_pgt */
+ convert_pfn_mfn(init_level4_pgt);
+
+ /* L3_i[0] -> level2_ident_pgt */
+ convert_pfn_mfn(level3_ident_pgt);
+ /* L3_k[510] -> level2_kernel_pgt
+ * L3_k[511] -> level2_fixmap_pgt */
+ convert_pfn_mfn(level3_kernel_pgt);
+
+ /* L3_k[511][506] -> level1_fixmap_pgt */
+ convert_pfn_mfn(level2_fixmap_pgt);
+ }
+ /* We get [511][511] and have Xen's version of level2_kernel_pgt */
+ l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
+ l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
+
+ addr[0] = (unsigned long)pgd;
+ addr[1] = (unsigned long)l3;
+ addr[2] = (unsigned long)l2;
+ /* Graft it onto L4[272][0]. Note that we creating an aliasing problem:
+ * Both L4[272][0] and L4[511][510] have entries that point to the same
+ * L2 (PMD) tables. Meaning that if you modify it in __va space
+ * it will be also modified in the __ka space! (But if you just
+ * modify the PMD table to point to other PTE's or none, then you
+ * are OK - which is what cleanup_highmap does) */
+ copy_page(level2_ident_pgt, l2);
+ /* Graft it onto L4[511][510] */
+ copy_page(level2_kernel_pgt, l2);
+
+ /* Copy the initial P->M table mappings if necessary. */
+ i = pgd_index(xen_start_info->mfn_list);
+ if (i && i < pgd_index(__START_KERNEL_map))
+ init_level4_pgt[i] = ((pgd_t *)xen_start_info->pt_base)[i];
+
+ if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ /* Make pagetable pieces RO */
+ set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
+ set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
+ set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
+ set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
+ set_page_prot(level2_ident_pgt, PAGE_KERNEL_RO);
+ set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
+ set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
+ set_page_prot(level1_fixmap_pgt, PAGE_KERNEL_RO);
+
+ /* Pin down new L4 */
+ pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
+ PFN_DOWN(__pa_symbol(init_level4_pgt)));
+
+ /* Unpin Xen-provided one */
+ pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
+
+ /*
+ * At this stage there can be no user pgd, and no page
+ * structure to attach it to, so make sure we just set kernel
+ * pgd.
+ */
+ xen_mc_batch();
+ __xen_write_cr3(true, __pa(init_level4_pgt));
+ xen_mc_issue(PARAVIRT_LAZY_CPU);
+ } else
+ native_write_cr3(__pa(init_level4_pgt));
+
+ /* We can't that easily rip out L3 and L2, as the Xen pagetables are
+ * set out this way: [L4], [L1], [L2], [L3], [L1], [L1] ... for
+ * the initial domain. For guests using the toolstack, they are in:
+ * [L4], [L3], [L2], [L1], [L1], order .. So for dom0 we can only
+ * rip out the [L4] (pgd), but for guests we shave off three pages.
+ */
+ for (i = 0; i < ARRAY_SIZE(addr); i++)
+ check_pt_base(&pt_base, &pt_end, addr[i]);
+
+ /* Our (by three pages) smaller Xen pagetable that we are using */
+ xen_pt_base = PFN_PHYS(pt_base);
+ xen_pt_size = (pt_end - pt_base) * PAGE_SIZE;
+ memblock_reserve(xen_pt_base, xen_pt_size);
+
+ /* Revector the xen_start_info */
+ xen_start_info = (struct start_info *)__va(__pa(xen_start_info));
+}
+
+/*
+ * Read a value from a physical address.
+ */
+static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
+{
+ unsigned long *vaddr;
+ unsigned long val;
+
+ vaddr = early_memremap_ro(addr, sizeof(val));
+ val = *vaddr;
+ early_memunmap(vaddr, sizeof(val));
+ return val;
+}
+
+/*
+ * Translate a virtual address to a physical one without relying on mapped
+ * page tables.
+ */
+static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
+{
+ phys_addr_t pa;
+ pgd_t pgd;
+ pud_t pud;
+ pmd_t pmd;
+ pte_t pte;
+
+ pa = read_cr3();
+ pgd = native_make_pgd(xen_read_phys_ulong(pa + pgd_index(vaddr) *
+ sizeof(pgd)));
+ if (!pgd_present(pgd))
+ return 0;
+
+ pa = pgd_val(pgd) & PTE_PFN_MASK;
+ pud = native_make_pud(xen_read_phys_ulong(pa + pud_index(vaddr) *
+ sizeof(pud)));
+ if (!pud_present(pud))
+ return 0;
+ pa = pud_pfn(pud) << PAGE_SHIFT;
+ if (pud_large(pud))
+ return pa + (vaddr & ~PUD_MASK);
+
+ pmd = native_make_pmd(xen_read_phys_ulong(pa + pmd_index(vaddr) *
+ sizeof(pmd)));
+ if (!pmd_present(pmd))
+ return 0;
+ pa = pmd_pfn(pmd) << PAGE_SHIFT;
+ if (pmd_large(pmd))
+ return pa + (vaddr & ~PMD_MASK);
+
+ pte = native_make_pte(xen_read_phys_ulong(pa + pte_index(vaddr) *
+ sizeof(pte)));
+ if (!pte_present(pte))
+ return 0;
+ pa = pte_pfn(pte) << PAGE_SHIFT;
+
+ return pa | (vaddr & ~PAGE_MASK);
+}
+
+/*
+ * Find a new area for the hypervisor supplied p2m list and relocate the p2m to
+ * this area.
+ */
+void __init xen_relocate_p2m(void)
+{
+ phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys;
+ unsigned long p2m_pfn, p2m_pfn_end, n_frames, pfn, pfn_end;
+ int n_pte, n_pt, n_pmd, n_pud, idx_pte, idx_pt, idx_pmd, idx_pud;
+ pte_t *pt;
+ pmd_t *pmd;
+ pud_t *pud;
+ pgd_t *pgd;
+ unsigned long *new_p2m;
+
+ size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
+ n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
+ n_pt = roundup(size, PMD_SIZE) >> PMD_SHIFT;
+ n_pmd = roundup(size, PUD_SIZE) >> PUD_SHIFT;
+ n_pud = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
+ n_frames = n_pte + n_pt + n_pmd + n_pud;
+
+ new_area = xen_find_free_area(PFN_PHYS(n_frames));
+ if (!new_area) {
+ xen_raw_console_write("Can't find new memory area for p2m needed due to E820 map conflict\n");
+ BUG();
+ }
+
+ /*
+ * Setup the page tables for addressing the new p2m list.
+ * We have asked the hypervisor to map the p2m list at the user address
+ * PUD_SIZE. It may have done so, or it may have used a kernel space
+ * address depending on the Xen version.
+ * To avoid any possible virtual address collision, just use
+ * 2 * PUD_SIZE for the new area.
+ */
+ pud_phys = new_area;
+ pmd_phys = pud_phys + PFN_PHYS(n_pud);
+ pt_phys = pmd_phys + PFN_PHYS(n_pmd);
+ p2m_pfn = PFN_DOWN(pt_phys) + n_pt;
+
+ pgd = __va(read_cr3());
+ new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
+ for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
+ pud = early_memremap(pud_phys, PAGE_SIZE);
+ clear_page(pud);
+ for (idx_pmd = 0; idx_pmd < min(n_pmd, PTRS_PER_PUD);
+ idx_pmd++) {
+ pmd = early_memremap(pmd_phys, PAGE_SIZE);
+ clear_page(pmd);
+ for (idx_pt = 0; idx_pt < min(n_pt, PTRS_PER_PMD);
+ idx_pt++) {
+ pt = early_memremap(pt_phys, PAGE_SIZE);
+ clear_page(pt);
+ for (idx_pte = 0;
+ idx_pte < min(n_pte, PTRS_PER_PTE);
+ idx_pte++) {
+ set_pte(pt + idx_pte,
+ pfn_pte(p2m_pfn, PAGE_KERNEL));
+ p2m_pfn++;
+ }
+ n_pte -= PTRS_PER_PTE;
+ early_memunmap(pt, PAGE_SIZE);
+ make_lowmem_page_readonly(__va(pt_phys));
+ pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE,
+ PFN_DOWN(pt_phys));
+ set_pmd(pmd + idx_pt,
+ __pmd(_PAGE_TABLE | pt_phys));
+ pt_phys += PAGE_SIZE;
+ }
+ n_pt -= PTRS_PER_PMD;
+ early_memunmap(pmd, PAGE_SIZE);
+ make_lowmem_page_readonly(__va(pmd_phys));
+ pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE,
+ PFN_DOWN(pmd_phys));
+ set_pud(pud + idx_pmd, __pud(_PAGE_TABLE | pmd_phys));
+ pmd_phys += PAGE_SIZE;
+ }
+ n_pmd -= PTRS_PER_PUD;
+ early_memunmap(pud, PAGE_SIZE);
+ make_lowmem_page_readonly(__va(pud_phys));
+ pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));
+ set_pgd(pgd + 2 + idx_pud, __pgd(_PAGE_TABLE | pud_phys));
+ pud_phys += PAGE_SIZE;
+ }
+
+ /* Now copy the old p2m info to the new area. */
+ memcpy(new_p2m, xen_p2m_addr, size);
+ xen_p2m_addr = new_p2m;
+
+ /* Release the old p2m list and set new list info. */
+ p2m_pfn = PFN_DOWN(xen_early_virt_to_phys(xen_start_info->mfn_list));
+ BUG_ON(!p2m_pfn);
+ p2m_pfn_end = p2m_pfn + PFN_DOWN(size);
+
+ if (xen_start_info->mfn_list < __START_KERNEL_map) {
+ pfn = xen_start_info->first_p2m_pfn;
+ pfn_end = xen_start_info->first_p2m_pfn +
+ xen_start_info->nr_p2m_frames;
+ set_pgd(pgd + 1, __pgd(0));
+ } else {
+ pfn = p2m_pfn;
+ pfn_end = p2m_pfn_end;
+ }
+
+ memblock_free(PFN_PHYS(pfn), PAGE_SIZE * (pfn_end - pfn));
+ while (pfn < pfn_end) {
+ if (pfn == p2m_pfn) {
+ pfn = p2m_pfn_end;
+ continue;
+ }
+ make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
+ pfn++;
+ }
+
+ xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
+ xen_start_info->first_p2m_pfn = PFN_DOWN(new_area);
+ xen_start_info->nr_p2m_frames = n_frames;
+}
+
+#else /* !CONFIG_X86_64 */
+static RESERVE_BRK_ARRAY(pmd_t, initial_kernel_pmd, PTRS_PER_PMD);
+static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);
+
+static void __init xen_write_cr3_init(unsigned long cr3)
+{
+ unsigned long pfn = PFN_DOWN(__pa(swapper_pg_dir));
+
+ BUG_ON(read_cr3() != __pa(initial_page_table));
+ BUG_ON(cr3 != __pa(swapper_pg_dir));
+
+ /*
+ * We are switching to swapper_pg_dir for the first time (from
+ * initial_page_table) and therefore need to mark that page
+ * read-only and then pin it.
+ *
+ * Xen disallows sharing of kernel PMDs for PAE
+ * guests. Therefore we must copy the kernel PMD from
+ * initial_page_table into a new kernel PMD to be used in
+ * swapper_pg_dir.
+ */
+ swapper_kernel_pmd =
+ extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
+ copy_page(swapper_kernel_pmd, initial_kernel_pmd);
+ swapper_pg_dir[KERNEL_PGD_BOUNDARY] =
+ __pgd(__pa(swapper_kernel_pmd) | _PAGE_PRESENT);
+ set_page_prot(swapper_kernel_pmd, PAGE_KERNEL_RO);
+
+ set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
+ xen_write_cr3(cr3);
+ pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, pfn);
+
+ pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
+ PFN_DOWN(__pa(initial_page_table)));
+ set_page_prot(initial_page_table, PAGE_KERNEL);
+ set_page_prot(initial_kernel_pmd, PAGE_KERNEL);
+
+ pv_mmu_ops.write_cr3 = &xen_write_cr3;
+}
+
+/*
+ * For 32 bit domains xen_start_info->pt_base is the pgd address which might be
+ * not the first page table in the page table pool.
+ * Iterate through the initial page tables to find the real page table base.
+ */
+static phys_addr_t xen_find_pt_base(pmd_t *pmd)
+{
+ phys_addr_t pt_base, paddr;
+ unsigned pmdidx;
+
+ pt_base = min(__pa(xen_start_info->pt_base), __pa(pmd));
+
+ for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++)
+ if (pmd_present(pmd[pmdidx]) && !pmd_large(pmd[pmdidx])) {
+ paddr = m2p(pmd[pmdidx].pmd);
+ pt_base = min(pt_base, paddr);
+ }
+
+ return pt_base;
+}
+
+void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
+{
+ pmd_t *kernel_pmd;
+
+ kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
+
+ xen_pt_base = xen_find_pt_base(kernel_pmd);
+ xen_pt_size = xen_start_info->nr_pt_frames * PAGE_SIZE;
+
+ initial_kernel_pmd =
+ extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
+
+ max_pfn_mapped = PFN_DOWN(xen_pt_base + xen_pt_size + 512 * 1024);
+
+ copy_page(initial_kernel_pmd, kernel_pmd);
+
+ xen_map_identity_early(initial_kernel_pmd, max_pfn);
+
+ copy_page(initial_page_table, pgd);
+ initial_page_table[KERNEL_PGD_BOUNDARY] =
+ __pgd(__pa(initial_kernel_pmd) | _PAGE_PRESENT);
+
+ set_page_prot(initial_kernel_pmd, PAGE_KERNEL_RO);
+ set_page_prot(initial_page_table, PAGE_KERNEL_RO);
+ set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
+
+ pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
+
+ pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE,
+ PFN_DOWN(__pa(initial_page_table)));
+ xen_write_cr3(__pa(initial_page_table));
+
+ memblock_reserve(xen_pt_base, xen_pt_size);
+}
+#endif /* CONFIG_X86_64 */
+
+void __init xen_reserve_special_pages(void)
+{
+ phys_addr_t paddr;
+
+ memblock_reserve(__pa(xen_start_info), PAGE_SIZE);
+ if (xen_start_info->store_mfn) {
+ paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->store_mfn));
+ memblock_reserve(paddr, PAGE_SIZE);
+ }
+ if (!xen_initial_domain()) {
+ paddr = PFN_PHYS(mfn_to_pfn(xen_start_info->console.domU.mfn));
+ memblock_reserve(paddr, PAGE_SIZE);
+ }
+}
+
+void __init xen_pt_check_e820(void)
+{
+ if (xen_is_e820_reserved(xen_pt_base, xen_pt_size)) {
+ xen_raw_console_write("Xen hypervisor allocated page table memory conflicts with E820 map\n");
+ BUG();
+ }
+}
+
+static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
+
+static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
+{
+ pte_t pte;
+
+ phys >>= PAGE_SHIFT;
+
+ switch (idx) {
+ case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
+ case FIX_RO_IDT:
+#ifdef CONFIG_X86_32
+ case FIX_WP_TEST:
+# ifdef CONFIG_HIGHMEM
+ case FIX_KMAP_BEGIN ... FIX_KMAP_END:
+# endif
+#elif defined(CONFIG_X86_VSYSCALL_EMULATION)
+ case VSYSCALL_PAGE:
+#endif
+ case FIX_TEXT_POKE0:
+ case FIX_TEXT_POKE1:
+ /* All local page mappings */
+ pte = pfn_pte(phys, prot);
+ break;
+
+#ifdef CONFIG_X86_LOCAL_APIC
+ case FIX_APIC_BASE: /* maps dummy local APIC */
+ pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
+ break;
+#endif
+
+#ifdef CONFIG_X86_IO_APIC
+ case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END:
+ /*
+ * We just don't map the IO APIC - all access is via
+ * hypercalls. Keep the address in the pte for reference.
+ */
+ pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
+ break;
+#endif
+
+ case FIX_PARAVIRT_BOOTMAP:
+ /* This is an MFN, but it isn't an IO mapping from the
+ IO domain */
+ pte = mfn_pte(phys, prot);
+ break;
+
+ default:
+ /* By default, set_fixmap is used for hardware mappings */
+ pte = mfn_pte(phys, prot);
+ break;
+ }
+
+ __native_set_fixmap(idx, pte);
+
+#ifdef CONFIG_X86_VSYSCALL_EMULATION
+ /* Replicate changes to map the vsyscall page into the user
+ pagetable vsyscall mapping. */
+ if (idx == VSYSCALL_PAGE) {
+ unsigned long vaddr = __fix_to_virt(idx);
+ set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
+ }
+#endif
+}
+
+static void __init xen_post_allocator_init(void)
+{
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return;
+
+ pv_mmu_ops.set_pte = xen_set_pte;
+ pv_mmu_ops.set_pmd = xen_set_pmd;
+ pv_mmu_ops.set_pud = xen_set_pud;
+#if CONFIG_PGTABLE_LEVELS == 4
+ pv_mmu_ops.set_pgd = xen_set_pgd;
+#endif
+
+ /* This will work as long as patching hasn't happened yet
+ (which it hasn't) */
+ pv_mmu_ops.alloc_pte = xen_alloc_pte;
+ pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
+ pv_mmu_ops.release_pte = xen_release_pte;
+ pv_mmu_ops.release_pmd = xen_release_pmd;
+#if CONFIG_PGTABLE_LEVELS == 4
+ pv_mmu_ops.alloc_pud = xen_alloc_pud;
+ pv_mmu_ops.release_pud = xen_release_pud;
+#endif
+ pv_mmu_ops.make_pte = PV_CALLEE_SAVE(xen_make_pte);
+
+#ifdef CONFIG_X86_64
+ pv_mmu_ops.write_cr3 = &xen_write_cr3;
+ SetPagePinned(virt_to_page(level3_user_vsyscall));
+#endif
+ xen_mark_init_mm_pinned();
+}
+
+static void xen_leave_lazy_mmu(void)
+{
+ preempt_disable();
+ xen_mc_flush();
+ paravirt_leave_lazy_mmu();
+ preempt_enable();
+}
+
+static const struct pv_mmu_ops xen_mmu_ops __initconst = {
+ .read_cr2 = xen_read_cr2,
+ .write_cr2 = xen_write_cr2,
+
+ .read_cr3 = xen_read_cr3,
+ .write_cr3 = xen_write_cr3_init,
+
+ .flush_tlb_user = xen_flush_tlb,
+ .flush_tlb_kernel = xen_flush_tlb,
+ .flush_tlb_single = xen_flush_tlb_single,
+ .flush_tlb_others = xen_flush_tlb_others,
+
+ .pte_update = paravirt_nop,
+
+ .pgd_alloc = xen_pgd_alloc,
+ .pgd_free = xen_pgd_free,
+
+ .alloc_pte = xen_alloc_pte_init,
+ .release_pte = xen_release_pte_init,
+ .alloc_pmd = xen_alloc_pmd_init,
+ .release_pmd = xen_release_pmd_init,
+
+ .set_pte = xen_set_pte_init,
+ .set_pte_at = xen_set_pte_at,
+ .set_pmd = xen_set_pmd_hyper,
+
+ .ptep_modify_prot_start = __ptep_modify_prot_start,
+ .ptep_modify_prot_commit = __ptep_modify_prot_commit,
+
+ .pte_val = PV_CALLEE_SAVE(xen_pte_val),
+ .pgd_val = PV_CALLEE_SAVE(xen_pgd_val),
+
+ .make_pte = PV_CALLEE_SAVE(xen_make_pte_init),
+ .make_pgd = PV_CALLEE_SAVE(xen_make_pgd),
+
+#ifdef CONFIG_X86_PAE
+ .set_pte_atomic = xen_set_pte_atomic,
+ .pte_clear = xen_pte_clear,
+ .pmd_clear = xen_pmd_clear,
+#endif /* CONFIG_X86_PAE */
+ .set_pud = xen_set_pud_hyper,
+
+ .make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
+ .pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
+
+#if CONFIG_PGTABLE_LEVELS == 4
+ .pud_val = PV_CALLEE_SAVE(xen_pud_val),
+ .make_pud = PV_CALLEE_SAVE(xen_make_pud),
+ .set_pgd = xen_set_pgd_hyper,
+
+ .alloc_pud = xen_alloc_pmd_init,
+ .release_pud = xen_release_pmd_init,
+#endif /* CONFIG_PGTABLE_LEVELS == 4 */
+
+ .activate_mm = xen_activate_mm,
+ .dup_mmap = xen_dup_mmap,
+ .exit_mmap = xen_exit_mmap,
+
+ .lazy_mode = {
+ .enter = paravirt_enter_lazy_mmu,
+ .leave = xen_leave_lazy_mmu,
+ .flush = paravirt_flush_lazy_mmu,
+ },
+
+ .set_fixmap = xen_set_fixmap,
+};
+
+void __init xen_init_mmu_ops(void)
+{
+ x86_init.paging.pagetable_init = xen_pagetable_init;
+
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return;
+
+ pv_mmu_ops = xen_mmu_ops;
+
+ memset(dummy_mapping, 0xff, PAGE_SIZE);
+}
+
+/* Protected by xen_reservation_lock. */
+#define MAX_CONTIG_ORDER 9 /* 2MB */
+static unsigned long discontig_frames[1<<MAX_CONTIG_ORDER];
+
+#define VOID_PTE (mfn_pte(0, __pgprot(0)))
+static void xen_zap_pfn_range(unsigned long vaddr, unsigned int order,
+ unsigned long *in_frames,
+ unsigned long *out_frames)
+{
+ int i;
+ struct multicall_space mcs;
+
+ xen_mc_batch();
+ for (i = 0; i < (1UL<<order); i++, vaddr += PAGE_SIZE) {
+ mcs = __xen_mc_entry(0);
+
+ if (in_frames)
+ in_frames[i] = virt_to_mfn(vaddr);
+
+ MULTI_update_va_mapping(mcs.mc, vaddr, VOID_PTE, 0);
+ __set_phys_to_machine(virt_to_pfn(vaddr), INVALID_P2M_ENTRY);
+
+ if (out_frames)
+ out_frames[i] = virt_to_pfn(vaddr);
+ }
+ xen_mc_issue(0);
+}
+
+/*
+ * Update the pfn-to-mfn mappings for a virtual address range, either to
+ * point to an array of mfns, or contiguously from a single starting
+ * mfn.
+ */
+static void xen_remap_exchanged_ptes(unsigned long vaddr, int order,
+ unsigned long *mfns,
+ unsigned long first_mfn)
+{
+ unsigned i, limit;
+ unsigned long mfn;
+
+ xen_mc_batch();
+
+ limit = 1u << order;
+ for (i = 0; i < limit; i++, vaddr += PAGE_SIZE) {
+ struct multicall_space mcs;
+ unsigned flags;
+
+ mcs = __xen_mc_entry(0);
+ if (mfns)
+ mfn = mfns[i];
+ else
+ mfn = first_mfn + i;
+
+ if (i < (limit - 1))
+ flags = 0;
+ else {
+ if (order == 0)
+ flags = UVMF_INVLPG | UVMF_ALL;
+ else
+ flags = UVMF_TLB_FLUSH | UVMF_ALL;
+ }
+
+ MULTI_update_va_mapping(mcs.mc, vaddr,
+ mfn_pte(mfn, PAGE_KERNEL), flags);
+
+ set_phys_to_machine(virt_to_pfn(vaddr), mfn);
+ }
+
+ xen_mc_issue(0);
+}
+
+/*
+ * Perform the hypercall to exchange a region of our pfns to point to
+ * memory with the required contiguous alignment. Takes the pfns as
+ * input, and populates mfns as output.
+ *
+ * Returns a success code indicating whether the hypervisor was able to
+ * satisfy the request or not.
+ */
+static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
+ unsigned long *pfns_in,
+ unsigned long extents_out,
+ unsigned int order_out,
+ unsigned long *mfns_out,
+ unsigned int address_bits)
+{
+ long rc;
+ int success;
+
+ struct xen_memory_exchange exchange = {
+ .in = {
+ .nr_extents = extents_in,
+ .extent_order = order_in,
+ .extent_start = pfns_in,
+ .domid = DOMID_SELF
+ },
+ .out = {
+ .nr_extents = extents_out,
+ .extent_order = order_out,
+ .extent_start = mfns_out,
+ .address_bits = address_bits,
+ .domid = DOMID_SELF
+ }
+ };
+
+ BUG_ON(extents_in << order_in != extents_out << order_out);
+
+ rc = HYPERVISOR_memory_op(XENMEM_exchange, &exchange);
+ success = (exchange.nr_exchanged == extents_in);
+
+ BUG_ON(!success && ((exchange.nr_exchanged != 0) || (rc == 0)));
+ BUG_ON(success && (rc != 0));
+
+ return success;
+}
+
+int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
+ unsigned int address_bits,
+ dma_addr_t *dma_handle)
+{
+ unsigned long *in_frames = discontig_frames, out_frame;
+ unsigned long flags;
+ int success;
+ unsigned long vstart = (unsigned long)phys_to_virt(pstart);
+
+ /*
+ * Currently an auto-translated guest will not perform I/O, nor will
+ * it require PAE page directories below 4GB. Therefore any calls to
+ * this function are redundant and can be ignored.
+ */
+
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 0;
+
+ if (unlikely(order > MAX_CONTIG_ORDER))
+ return -ENOMEM;
+
+ memset((void *) vstart, 0, PAGE_SIZE << order);
+
+ spin_lock_irqsave(&xen_reservation_lock, flags);
+
+ /* 1. Zap current PTEs, remembering MFNs. */
+ xen_zap_pfn_range(vstart, order, in_frames, NULL);
+
+ /* 2. Get a new contiguous memory extent. */
+ out_frame = virt_to_pfn(vstart);
+ success = xen_exchange_memory(1UL << order, 0, in_frames,
+ 1, order, &out_frame,
+ address_bits);
+
+ /* 3. Map the new extent in place of old pages. */
+ if (success)
+ xen_remap_exchanged_ptes(vstart, order, NULL, out_frame);
+ else
+ xen_remap_exchanged_ptes(vstart, order, in_frames, 0);
+
+ spin_unlock_irqrestore(&xen_reservation_lock, flags);
+
+ *dma_handle = virt_to_machine(vstart).maddr;
+ return success ? 0 : -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
+
+void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
+{
+ unsigned long *out_frames = discontig_frames, in_frame;
+ unsigned long flags;
+ int success;
+ unsigned long vstart;
+
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return;
+
+ if (unlikely(order > MAX_CONTIG_ORDER))
+ return;
+
+ vstart = (unsigned long)phys_to_virt(pstart);
+ memset((void *) vstart, 0, PAGE_SIZE << order);
+
+ spin_lock_irqsave(&xen_reservation_lock, flags);
+
+ /* 1. Find start MFN of contiguous extent. */
+ in_frame = virt_to_mfn(vstart);
+
+ /* 2. Zap current PTEs. */
+ xen_zap_pfn_range(vstart, order, NULL, out_frames);
+
+ /* 3. Do the exchange for non-contiguous MFNs. */
+ success = xen_exchange_memory(1, order, &in_frame, 1UL << order,
+ 0, out_frames, 0);
+
+ /* 4. Map new pages in place of old pages. */
+ if (success)
+ xen_remap_exchanged_ptes(vstart, order, out_frames, 0);
+ else
+ xen_remap_exchanged_ptes(vstart, order, NULL, in_frame);
+
+ spin_unlock_irqrestore(&xen_reservation_lock, flags);
+}
+EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 14/21] x86/xen: split suspend.c for PV and PVHVM guests
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (12 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 13/21] x86/xen: split off mmu_pv.c Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-05 9:13 ` [Xen-devel] " kbuild test robot
2017-03-02 17:53 ` [PATCH v2 15/21] x86/xen: put setup.c, pmu.c and apic.c under CONFIG_XEN_PV Vitaly Kuznetsov
` (7 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Slit the code in suspend.c into suspend_pv.c and suspend_hvm.c.
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Makefile | 3 ++-
arch/x86/xen/suspend.c | 54 ----------------------------------------------
arch/x86/xen/suspend_hvm.c | 22 +++++++++++++++++++
arch/x86/xen/suspend_pv.c | 44 +++++++++++++++++++++++++++++++++++++
arch/x86/xen/xen-ops.h | 13 +++++++++++
5 files changed, 81 insertions(+), 55 deletions(-)
create mode 100644 arch/x86/xen/suspend_hvm.c
create mode 100644 arch/x86/xen/suspend_pv.c
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 8da1ca9..cf8d6c5 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -15,7 +15,8 @@ obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
grant-table.o suspend.o platform-pci-unplug.o \
p2m.o apic.o pmu.o enlighten_pv.o mmu_pv.o
-obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o mmu_hvm.o
+obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o mmu_hvm.o suspend_hvm.o
+obj-$(CONFIG_XEN_PV) += suspend_pv.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index 7f664c4..d6b1680 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -14,60 +14,6 @@
#include "mmu.h"
#include "pmu.h"
-static void xen_pv_pre_suspend(void)
-{
- xen_mm_pin_all();
-
- xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
- xen_start_info->console.domU.mfn =
- mfn_to_pfn(xen_start_info->console.domU.mfn);
-
- BUG_ON(!irqs_disabled());
-
- HYPERVISOR_shared_info = &xen_dummy_shared_info;
- if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
- __pte_ma(0), 0))
- BUG();
-}
-
-static void xen_hvm_post_suspend(int suspend_cancelled)
-{
-#ifdef CONFIG_XEN_PVHVM
- int cpu;
- if (!suspend_cancelled)
- xen_hvm_init_shared_info();
- xen_callback_vector();
- xen_unplug_emulated_devices();
- if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
- for_each_online_cpu(cpu) {
- xen_setup_runstate_info(cpu);
- }
- }
-#endif
-}
-
-static void xen_pv_post_suspend(int suspend_cancelled)
-{
- xen_build_mfn_list_list();
-
- xen_setup_shared_info();
-
- if (suspend_cancelled) {
- xen_start_info->store_mfn =
- pfn_to_mfn(xen_start_info->store_mfn);
- xen_start_info->console.domU.mfn =
- pfn_to_mfn(xen_start_info->console.domU.mfn);
- } else {
-#ifdef CONFIG_SMP
- BUG_ON(xen_cpu_initialized_map == NULL);
- cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
-#endif
- xen_vcpu_restore();
- }
-
- xen_mm_unpin_all();
-}
-
void xen_arch_pre_suspend(void)
{
if (xen_pv_domain())
diff --git a/arch/x86/xen/suspend_hvm.c b/arch/x86/xen/suspend_hvm.c
new file mode 100644
index 0000000..01afcad
--- /dev/null
+++ b/arch/x86/xen/suspend_hvm.c
@@ -0,0 +1,22 @@
+#include <linux/types.h>
+
+#include <xen/xen.h>
+#include <xen/features.h>
+#include <xen/interface/features.h>
+
+#include "xen-ops.h"
+
+void xen_hvm_post_suspend(int suspend_cancelled)
+{
+ int cpu;
+
+ if (!suspend_cancelled)
+ xen_hvm_init_shared_info();
+ xen_callback_vector();
+ xen_unplug_emulated_devices();
+ if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
+ for_each_online_cpu(cpu) {
+ xen_setup_runstate_info(cpu);
+ }
+ }
+}
diff --git a/arch/x86/xen/suspend_pv.c b/arch/x86/xen/suspend_pv.c
new file mode 100644
index 0000000..496decca
--- /dev/null
+++ b/arch/x86/xen/suspend_pv.c
@@ -0,0 +1,44 @@
+#include <linux/types.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/xen/page.h>
+
+#include "xen-ops.h"
+
+void xen_pv_pre_suspend(void)
+{
+ xen_mm_pin_all();
+
+ xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
+ xen_start_info->console.domU.mfn =
+ mfn_to_pfn(xen_start_info->console.domU.mfn);
+
+ BUG_ON(!irqs_disabled());
+
+ HYPERVISOR_shared_info = &xen_dummy_shared_info;
+ if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
+ __pte_ma(0), 0))
+ BUG();
+}
+
+void xen_pv_post_suspend(int suspend_cancelled)
+{
+ xen_build_mfn_list_list();
+
+ xen_setup_shared_info();
+
+ if (suspend_cancelled) {
+ xen_start_info->store_mfn =
+ pfn_to_mfn(xen_start_info->store_mfn);
+ xen_start_info->console.domU.mfn =
+ pfn_to_mfn(xen_start_info->console.domU.mfn);
+ } else {
+#ifdef CONFIG_SMP
+ BUG_ON(xen_cpu_initialized_map == NULL);
+ cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
+#endif
+ xen_vcpu_restore();
+ }
+
+ xen_mm_unpin_all();
+}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 7baeb04..ed7ada2 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -153,5 +153,18 @@ extern int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
extern void xen_reboot(int reason);
extern void xen_emergency_restart(void);
+#ifdef CONFIG_XEN_PV
+extern void xen_pv_pre_suspend(void);
+extern void xen_pv_post_suspend(int suspend_cancelled);
+#else
+static inline void xen_pv_pre_suspend(void) {}
+static inline void xen_pv_post_suspend(int suspend_cancelled) {}
+#endif
+
+#ifdef CONFIG_XEN_PVHVM
+extern void xen_hvm_post_suspend(int suspend_cancelled);
+#else
+static inline void xen_hvm_post_suspend(int suspend_cancelled) {}
+#endif
#endif /* XEN_OPS_H */
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* Re: [Xen-devel] [PATCH v2 14/21] x86/xen: split suspend.c for PV and PVHVM guests
2017-03-02 17:53 ` [PATCH v2 14/21] x86/xen: split suspend.c for PV and PVHVM guests Vitaly Kuznetsov
@ 2017-03-05 9:13 ` kbuild test robot
0 siblings, 0 replies; 44+ messages in thread
From: kbuild test robot @ 2017-03-05 9:13 UTC (permalink / raw)
To: Vitaly Kuznetsov
Cc: kbuild-all, xen-devel, Juergen Gross, Boris Ostrovsky, x86,
Andrew Jones, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 2978 bytes --]
Hi Vitaly,
[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on next-20170303]
[cannot apply to v4.10]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Vitaly-Kuznetsov/x86-xen-untangle-PV-and-PVHVM-guest-support-code/20170305-162950
base: https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: x86_64-randconfig-i0-03021655 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
arch/x86/xen/suspend_pv.c: In function 'xen_pv_pre_suspend':
>> arch/x86/xen/suspend_pv.c:19:2: error: implicit declaration of function 'fix_to_virt' [-Werror=implicit-function-declaration]
if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
^
In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from arch/x86/xen/suspend_pv.c:1:
>> arch/x86/xen/suspend_pv.c:19:47: error: 'FIX_PARAVIRT_BOOTMAP' undeclared (first use in this function)
if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^
arch/x86/xen/suspend_pv.c:19:2: note: in expansion of macro 'if'
if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
^
arch/x86/xen/suspend_pv.c:19:47: note: each undeclared identifier is reported only once for each function it appears in
if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
^
include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^
arch/x86/xen/suspend_pv.c:19:2: note: in expansion of macro 'if'
if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
^
cc1: some warnings being treated as errors
vim +/fix_to_virt +19 arch/x86/xen/suspend_pv.c
13 xen_start_info->console.domU.mfn =
14 mfn_to_pfn(xen_start_info->console.domU.mfn);
15
16 BUG_ON(!irqs_disabled());
17
18 HYPERVISOR_shared_info = &xen_dummy_shared_info;
> 19 if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
20 __pte_ma(0), 0))
21 BUG();
22 }
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 21205 bytes --]
^ permalink raw reply [flat|nested] 44+ messages in thread
* [PATCH v2 15/21] x86/xen: put setup.c, pmu.c and apic.c under CONFIG_XEN_PV
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (13 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 14/21] x86/xen: split suspend.c for PV and PVHVM guests Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-02 17:53 ` [PATCH v2 16/21] x86/xen: define startup_xen for XEN PV only Vitaly Kuznetsov
` (6 subsequent siblings)
21 siblings, 0 replies; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
xen_pmu_init/finish() functions are used in suspend.c and
enlighten.c, add stubs for now.
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Kconfig | 2 +-
arch/x86/xen/Makefile | 6 +++---
arch/x86/xen/pmu.h | 5 +++++
3 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index dae8dc6..04284d9 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -6,7 +6,6 @@ config XEN
bool "Xen guest support"
depends on PARAVIRT
select PARAVIRT_CLOCK
- select XEN_HAVE_VPMU
depends on X86_64 || (X86_32 && X86_PAE)
depends on X86_LOCAL_APIC && X86_TSC
help
@@ -18,6 +17,7 @@ config XEN_PV
bool "Xen PV guest support"
default y
depends on XEN
+ select XEN_HAVE_VPMU
help
Support running as a Xen PV guest.
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index cf8d6c5..f610651 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -10,13 +10,13 @@ nostackp := $(call cc-option, -fno-stack-protector)
CFLAGS_enlighten_pv.o := $(nostackp)
CFLAGS_mmu_pv.o := $(nostackp)
-obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
+obj-y := enlighten.o multicalls.o mmu.o irq.o \
time.o xen-asm.o xen-asm_$(BITS).o \
grant-table.o suspend.o platform-pci-unplug.o \
- p2m.o apic.o pmu.o enlighten_pv.o mmu_pv.o
+ p2m.o enlighten_pv.o mmu_pv.o
obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o mmu_hvm.o suspend_hvm.o
-obj-$(CONFIG_XEN_PV) += suspend_pv.o
+obj-$(CONFIG_XEN_PV) += setup.o apic.o pmu.o suspend_pv.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
diff --git a/arch/x86/xen/pmu.h b/arch/x86/xen/pmu.h
index af5f0ad..4be5355 100644
--- a/arch/x86/xen/pmu.h
+++ b/arch/x86/xen/pmu.h
@@ -4,8 +4,13 @@
#include <xen/interface/xenpmu.h>
irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id);
+#ifdef CONFIG_XEN_HAVE_VPMU
void xen_pmu_init(int cpu);
void xen_pmu_finish(int cpu);
+#else
+static inline void xen_pmu_init(int cpu) {}
+static inline void xen_pmu_finish(int cpu) {}
+#endif
bool is_xen_pmu(int cpu);
bool pmu_msr_read(unsigned int msr, uint64_t *val, int *err);
bool pmu_msr_write(unsigned int msr, uint32_t low, uint32_t high, int *err);
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 16/21] x86/xen: define startup_xen for XEN PV only
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (14 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 15/21] x86/xen: put setup.c, pmu.c and apic.c under CONFIG_XEN_PV Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:36 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 17/21] x86/xen: create stubs for HVM-only builds in page.h Vitaly Kuznetsov
` (5 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
startup_xen references PV-only code, decorate it with #ifdef CONFIG_XEN_PV
to make PV-free builds possible.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/xen-head.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 37794e4..72a8e6a 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -16,6 +16,7 @@
#include <xen/interface/xen-mca.h>
#include <asm/xen/interface.h>
+#ifdef CONFIG_XEN_PV
__INIT
ENTRY(startup_xen)
cld
@@ -34,6 +35,7 @@ ENTRY(startup_xen)
jmp xen_start_kernel
__FINIT
+#endif
.pushsection .text
.balign PAGE_SIZE
@@ -58,7 +60,9 @@ ENTRY(hypercall_page)
/* Map the p2m table to a 512GB-aligned user address. */
ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE)
#endif
+#ifdef CONFIG_XEN_PV
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
+#endif
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
.ascii "!writable_page_tables|pae_pgdir_above_4gb")
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 17/21] x86/xen: create stubs for HVM-only builds in page.h
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (15 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 16/21] x86/xen: define startup_xen for XEN PV only Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:43 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 18/21] xen/balloon: decorate PV-only parts with #ifdef CONFIG_XEN_PV Vitaly Kuznetsov
` (4 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
__pfn_to_mfn() is only used from PV code (mmu_pv.c, p2m.c) and from
page.h where all functions calling it check for
xen_feature(XENFEAT_auto_translated_physmap) first so we can replace
it with any stub to make build happy.
set_foreign_p2m_mapping()/clear_foreign_p2m_mapping() are used from
grant-table.c but only if !xen_feature(XENFEAT_auto_translated_physmap).
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/include/asm/xen/page.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 33cbd3d..0bf4bb34 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -51,12 +51,30 @@ extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
unsigned long pfn_e);
+#ifdef CONFIG_XEN_PV
extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count);
extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
struct gnttab_unmap_grant_ref *kunmap_ops,
struct page **pages, unsigned int count);
+#else
+static inline int
+set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
+ struct gnttab_map_grant_ref *kmap_ops,
+ struct page **pages, unsigned int count)
+{
+ return 0;
+}
+
+static inline int
+clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
+ struct gnttab_unmap_grant_ref *kunmap_ops,
+ struct page **pages, unsigned int count)
+{
+ return 0;
+}
+#endif
/*
* Helper functions to write or read unsigned long values to/from
@@ -72,6 +90,7 @@ static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
return __get_user(*val, (unsigned long __user *)addr);
}
+#ifdef CONFIG_XEN_PV
/*
* When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
* - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
@@ -98,6 +117,12 @@ static inline unsigned long __pfn_to_mfn(unsigned long pfn)
return mfn;
}
+#else
+static inline unsigned long __pfn_to_mfn(unsigned long pfn)
+{
+ return pfn;
+}
+#endif
static inline unsigned long pfn_to_mfn(unsigned long pfn)
{
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* Re: [PATCH v2 17/21] x86/xen: create stubs for HVM-only builds in page.h
2017-03-02 17:53 ` [PATCH v2 17/21] x86/xen: create stubs for HVM-only builds in page.h Vitaly Kuznetsov
@ 2017-03-13 9:43 ` Juergen Gross
0 siblings, 0 replies; 44+ messages in thread
From: Juergen Gross @ 2017-03-13 9:43 UTC (permalink / raw)
To: Vitaly Kuznetsov, xen-devel
Cc: x86, linux-kernel, Boris Ostrovsky, Andrew Jones
On 02/03/17 18:53, Vitaly Kuznetsov wrote:
> __pfn_to_mfn() is only used from PV code (mmu_pv.c, p2m.c) and from
> page.h where all functions calling it check for
> xen_feature(XENFEAT_auto_translated_physmap) first so we can replace
> it with any stub to make build happy.
>
> set_foreign_p2m_mapping()/clear_foreign_p2m_mapping() are used from
> grant-table.c but only if !xen_feature(XENFEAT_auto_translated_physmap).
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
^ permalink raw reply [flat|nested] 44+ messages in thread
* [PATCH v2 18/21] xen/balloon: decorate PV-only parts with #ifdef CONFIG_XEN_PV
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (16 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 17/21] x86/xen: create stubs for HVM-only builds in page.h Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:47 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 19/21] xen: create xen_create/destroy_contiguous_region() stubs for PVHVM only builds Vitaly Kuznetsov
` (3 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Balloon driver uses several PV-only concepts (xen_start_info,
xen_extra_mem,..) and it seems the simpliest solution to make HVM-only
build happy is to decorate these parts with #ifdefs.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
drivers/xen/balloon.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index db107fa..b11ca75 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -708,6 +708,7 @@ void free_xenballooned_pages(int nr_pages, struct page **pages)
}
EXPORT_SYMBOL(free_xenballooned_pages);
+#ifdef CONFIG_XEN_PV
static void __init balloon_add_region(unsigned long start_pfn,
unsigned long pages)
{
@@ -731,19 +732,22 @@ static void __init balloon_add_region(unsigned long start_pfn,
balloon_stats.total_pages += extra_pfn_end - start_pfn;
}
+#endif
static int __init balloon_init(void)
{
- int i;
-
if (!xen_domain())
return -ENODEV;
pr_info("Initialising balloon driver\n");
+#ifdef CONFIG_XEN_PV
balloon_stats.current_pages = xen_pv_domain()
? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
: get_num_physpages();
+#else
+ balloon_stats.current_pages = get_num_physpages();
+#endif
balloon_stats.target_pages = balloon_stats.current_pages;
balloon_stats.balloon_low = 0;
balloon_stats.balloon_high = 0;
@@ -760,14 +764,20 @@ static int __init balloon_init(void)
register_sysctl_table(xen_root);
#endif
- /*
- * Initialize the balloon with pages from the extra memory
- * regions (see arch/x86/xen/setup.c).
- */
- for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
- if (xen_extra_mem[i].n_pfns)
- balloon_add_region(xen_extra_mem[i].start_pfn,
- xen_extra_mem[i].n_pfns);
+#ifdef CONFIG_XEN_PV
+ {
+ int i;
+
+ /*
+ * Initialize the balloon with pages from the extra memory
+ * regions (see arch/x86/xen/setup.c).
+ */
+ for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
+ if (xen_extra_mem[i].n_pfns)
+ balloon_add_region(xen_extra_mem[i].start_pfn,
+ xen_extra_mem[i].n_pfns);
+ }
+#endif
return 0;
}
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 19/21] xen: create xen_create/destroy_contiguous_region() stubs for PVHVM only builds
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (17 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 18/21] xen/balloon: decorate PV-only parts with #ifdef CONFIG_XEN_PV Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:47 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 20/21] x86/xen: enable PVHVM-only builds Vitaly Kuznetsov
` (2 subsequent siblings)
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
xen_create_contiguous_region()/xen_create_contiguous_region() are PV-only,
they both contain xen_feature(XENFEAT_auto_translated_physmap) check and
bail in the very beginning.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
include/xen/xen-ops.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index b5486e6..f939114 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -34,11 +34,25 @@ u64 xen_steal_clock(int cpu);
int xen_setup_shutdown_event(void);
extern unsigned long *xen_contiguous_bitmap;
+
+#ifdef CONFIG_XEN_PV
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle);
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);
+#else
+static inline int xen_create_contiguous_region(phys_addr_t pstart,
+ unsigned int order,
+ unsigned int address_bits,
+ dma_addr_t *dma_handle)
+{
+ return 0;
+}
+
+static inline void xen_destroy_contiguous_region(phys_addr_t pstart,
+ unsigned int order) { }
+#endif
struct vm_area_struct;
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 20/21] x86/xen: enable PVHVM-only builds
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (18 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 19/21] xen: create xen_create/destroy_contiguous_region() stubs for PVHVM only builds Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:48 ` Juergen Gross
2017-03-02 17:53 ` [PATCH v2 21/21] x86/xen: rename some PV-only functions in smp_pv.c Vitaly Kuznetsov
2017-03-05 17:59 ` [Xen-devel] [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Boris Ostrovsky
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
Now everything is in place and we can move PV-only code under
CONFIG_XEN_PV. CONFIG_XEN_PV_SMP is created to support the change.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/xen/Kconfig | 4 ++++
arch/x86/xen/Makefile | 9 +++++----
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 04284d9..aa8256b 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -21,6 +21,10 @@ config XEN_PV
help
Support running as a Xen PV guest.
+config XEN_PV_SMP
+ def_bool y
+ depends on XEN_PV && SMP
+
config XEN_DOM0
bool "Xen PV Dom0 support"
default y
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index f610651..fffb0a1 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -12,16 +12,17 @@ CFLAGS_mmu_pv.o := $(nostackp)
obj-y := enlighten.o multicalls.o mmu.o irq.o \
time.o xen-asm.o xen-asm_$(BITS).o \
- grant-table.o suspend.o platform-pci-unplug.o \
- p2m.o enlighten_pv.o mmu_pv.o
+ grant-table.o suspend.o platform-pci-unplug.o
obj-$(CONFIG_XEN_PVHVM) += enlighten_hvm.o mmu_hvm.o suspend_hvm.o
-obj-$(CONFIG_XEN_PV) += setup.o apic.o pmu.o suspend_pv.o
+obj-$(CONFIG_XEN_PV) += setup.o apic.o pmu.o suspend_pv.o \
+ p2m.o enlighten_pv.o mmu_pv.o
obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
obj-$(CONFIG_EVENT_TRACING) += trace.o
-obj-$(CONFIG_SMP) += smp.o smp_pv.o
+obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_XEN_PV_SMP) += smp_pv.o
obj-$(CONFIG_XEN_PVHVM_SMP) += smp_hvm.o
obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* [PATCH v2 21/21] x86/xen: rename some PV-only functions in smp_pv.c
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (19 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 20/21] x86/xen: enable PVHVM-only builds Vitaly Kuznetsov
@ 2017-03-02 17:53 ` Vitaly Kuznetsov
2017-03-13 9:49 ` Juergen Gross
2017-03-05 17:59 ` [Xen-devel] [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Boris Ostrovsky
21 siblings, 1 reply; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-02 17:53 UTC (permalink / raw)
To: xen-devel; +Cc: x86, linux-kernel, Boris Ostrovsky, Juergen Gross, Andrew Jones
After code split between PV and HVM some functions in xen_smp_ops have
xen_pv_ prefix and some only xen_ which makes them look like they're
common for both PV and HVM while they're not. Rename all the rest to
have xen_pv_ prefix.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
- This patch is rather a matter of taste and it makes code archeology
slightly harder, we may consider dropping it from the series.
---
arch/x86/xen/smp_pv.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index e20718a..0110429 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -220,7 +220,7 @@ static void __init xen_pv_smp_prepare_boot_cpu(void)
xen_init_spinlocks();
}
-static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
+static void __init xen_pv_smp_prepare_cpus(unsigned int max_cpus)
{
unsigned cpu;
unsigned int i;
@@ -336,7 +336,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
return 0;
}
-static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
+static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle)
{
int rc;
@@ -370,12 +370,12 @@ static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
return 0;
}
-static void xen_smp_cpus_done(unsigned int max_cpus)
+static void xen_pv_smp_cpus_done(unsigned int max_cpus)
{
}
#ifdef CONFIG_HOTPLUG_CPU
-static int xen_cpu_disable(void)
+static int xen_pv_cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
if (cpu == 0)
@@ -403,7 +403,7 @@ static void xen_pv_cpu_die(unsigned int cpu)
}
}
-static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
+static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
{
play_dead_common();
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
@@ -420,7 +420,7 @@ static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
}
#else /* !CONFIG_HOTPLUG_CPU */
-static int xen_cpu_disable(void)
+static int xen_pv_cpu_disable(void)
{
return -ENOSYS;
}
@@ -430,7 +430,7 @@ static void xen_pv_cpu_die(unsigned int cpu)
BUG();
}
-static void xen_play_dead(void)
+static void xen_pv_play_dead(void)
{
BUG();
}
@@ -450,7 +450,7 @@ static void stop_self(void *v)
BUG();
}
-static void xen_stop_other_cpus(int wait)
+static void xen_pv_stop_other_cpus(int wait)
{
smp_call_function(stop_self, NULL, wait);
}
@@ -477,15 +477,15 @@ static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
static const struct smp_ops xen_smp_ops __initconst = {
.smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
- .smp_prepare_cpus = xen_smp_prepare_cpus,
- .smp_cpus_done = xen_smp_cpus_done,
+ .smp_prepare_cpus = xen_pv_smp_prepare_cpus,
+ .smp_cpus_done = xen_pv_smp_cpus_done,
- .cpu_up = xen_cpu_up,
+ .cpu_up = xen_pv_cpu_up,
.cpu_die = xen_pv_cpu_die,
- .cpu_disable = xen_cpu_disable,
- .play_dead = xen_play_dead,
+ .cpu_disable = xen_pv_cpu_disable,
+ .play_dead = xen_pv_play_dead,
- .stop_other_cpus = xen_stop_other_cpus,
+ .stop_other_cpus = xen_pv_stop_other_cpus,
.smp_send_reschedule = xen_smp_send_reschedule,
.send_call_func_ipi = xen_smp_send_call_function_ipi,
--
2.9.3
^ permalink raw reply related [flat|nested] 44+ messages in thread* Re: [PATCH v2 21/21] x86/xen: rename some PV-only functions in smp_pv.c
2017-03-02 17:53 ` [PATCH v2 21/21] x86/xen: rename some PV-only functions in smp_pv.c Vitaly Kuznetsov
@ 2017-03-13 9:49 ` Juergen Gross
0 siblings, 0 replies; 44+ messages in thread
From: Juergen Gross @ 2017-03-13 9:49 UTC (permalink / raw)
To: Vitaly Kuznetsov, xen-devel
Cc: x86, linux-kernel, Boris Ostrovsky, Andrew Jones
On 02/03/17 18:53, Vitaly Kuznetsov wrote:
> After code split between PV and HVM some functions in xen_smp_ops have
> xen_pv_ prefix and some only xen_ which makes them look like they're
> common for both PV and HVM while they're not. Rename all the rest to
> have xen_pv_ prefix.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> - This patch is rather a matter of taste and it makes code archeology
> slightly harder, we may consider dropping it from the series.
I'm fine with this change.
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
^ permalink raw reply [flat|nested] 44+ messages in thread
* Re: [Xen-devel] [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code
2017-03-02 17:53 [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Vitaly Kuznetsov
` (20 preceding siblings ...)
2017-03-02 17:53 ` [PATCH v2 21/21] x86/xen: rename some PV-only functions in smp_pv.c Vitaly Kuznetsov
@ 2017-03-05 17:59 ` Boris Ostrovsky
2017-03-13 13:02 ` Vitaly Kuznetsov
21 siblings, 1 reply; 44+ messages in thread
From: Boris Ostrovsky @ 2017-03-05 17:59 UTC (permalink / raw)
To: Vitaly Kuznetsov, xen-devel
Cc: Juergen Gross, x86, Andrew Jones, linux-kernel
On 03/02/2017 12:53 PM, Vitaly Kuznetsov wrote:
> Changes since v1:
> - Patches 1,2 and 3 were split and reordered to avoid adding temporary
> #ifdefs [Juergen Gross]
> - Juergen's R-b added to what is now patches 14 and 15 (patches 4 and 5
> in v1). Due to re-ordering there are some tiny diffrences but I opted
> for keeping the tag.
>
> Some patches are known to produce checkpatch.pl WARNINGS and a couple of
> ERRORs, I fixed a few (mostly in _hvm* code I split) and I refrained from
> fixing the rest to make it easier to review. I think that we may leave PV
> code as it is as sooner or later it will go away.
>
> Original description:
>
> I have a long-standing idea to separate PV and PVHVM code in kernel and
> introduce Kconfig options to make it possible to enable the required
> parts only breaking the current 'all or nothing' approach.
I tried applying this to mainline and it failed at some point. Is there
a branch i can pull from?
Thanks.
-boris
^ permalink raw reply [flat|nested] 44+ messages in thread* Re: [Xen-devel] [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code
2017-03-05 17:59 ` [Xen-devel] [PATCH v2 00/21] x86/xen: untangle PV and PVHVM guest support code Boris Ostrovsky
@ 2017-03-13 13:02 ` Vitaly Kuznetsov
0 siblings, 0 replies; 44+ messages in thread
From: Vitaly Kuznetsov @ 2017-03-13 13:02 UTC (permalink / raw)
To: Boris Ostrovsky; +Cc: xen-devel, Juergen Gross, x86, Andrew Jones, linux-kernel
Boris Ostrovsky <boris.ostrovsky@oracle.com> writes:
> On 03/02/2017 12:53 PM, Vitaly Kuznetsov wrote:
>> Changes since v1:
>> - Patches 1,2 and 3 were split and reordered to avoid adding temporary
>> #ifdefs [Juergen Gross]
>> - Juergen's R-b added to what is now patches 14 and 15 (patches 4 and 5
>> in v1). Due to re-ordering there are some tiny diffrences but I opted
>> for keeping the tag.
>>
>> Some patches are known to produce checkpatch.pl WARNINGS and a couple of
>> ERRORs, I fixed a few (mostly in _hvm* code I split) and I refrained from
>> fixing the rest to make it easier to review. I think that we may leave PV
>> code as it is as sooner or later it will go away.
>>
>> Original description:
>>
>> I have a long-standing idea to separate PV and PVHVM code in kernel and
>> introduce Kconfig options to make it possible to enable the required
>> parts only breaking the current 'all or nothing' approach.
>
> I tried applying this to mainline and it failed at some point. Is
> there a branch i can pull from?
>
Sorry for the delayed response, I was on vacation last week.
Just pushed this series to github, you can pull it from
https://github.com/vittyvk/linux.git (xen_pv_hvm_split_v2 branch)
I'll be rebasing and addressing Juergen's and kbuild's comments this
week.
--
Vitaly
^ permalink raw reply [flat|nested] 44+ messages in thread