* [PATCH v7 00/14] x86: major paravirt cleanup
@ 2021-03-11 14:23 Juergen Gross
2021-03-11 14:23 ` [PATCH v7 04/14] x86/paravirt: switch time pvops functions to use static_call() Juergen Gross
0 siblings, 1 reply; 2+ messages in thread
From: Juergen Gross @ 2021-03-11 14:23 UTC (permalink / raw)
To: xen-devel, x86, linux-kernel, virtualization, linux-arm-kernel,
linux-hyperv, kvm, clang-built-linux
Cc: Juergen Gross, Andy Lutomirski, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, H. Peter Anvin, Peter Zijlstra, Josh Poimboeuf,
Jason Baron, Steven Rostedt, Ard Biesheuvel, Deep Shah, VMware,
Inc.,
Russell King, Catalin Marinas, Will Deacon, K. Y. Srinivasan,
Haiyang Zhang, Stephen Hemminger, Wei Liu, Paolo Bonzini,
Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li, Jim Mattson,
Joerg Roedel, Boris Ostrovsky, Stefano Stabellini,
Nathan Chancellor, Nick Desaulniers
This is a major cleanup of the paravirt infrastructure aiming at
eliminating all custom code patching via paravirt patching.
This is achieved by using ALTERNATIVE instead, leading to the ability
to give objtool access to the patched in instructions.
In order to remove most of the 32-bit special handling from pvops the
time related operations are switched to use static_call() instead.
At the end of this series all paravirt patching has to do is to
replace indirect calls with direct ones. In a further step this could
be switched to static_call(), too.
Changes in V7:
- dropped patch 3, as already applied on tip tree
- new patch 3 (patches 1 and 7 have been added to V6 late)
- addressed comments by Boris
Changes in V6:
- switched back to "not" bit in feature value for "not feature"
- other minor comments addressed
Changes in V5:
- patches 1-5 of V4 dropped, as already applied
- new patches 1+3
- fixed patch 2
- split V4 patch 8 into patches 4+5
- use flag byte instead of negative feature bit for "not feature"
Changes in V4:
- fixed several build failures
- removed objtool patch, as objtool patches are in tip now
- added patch 1 for making usage of static_call easier
- even more cleanup
Changes in V3:
- added patches 7 and 12
- addressed all comments
Changes in V2:
- added patches 5-12
Juergen Gross (14):
x86/alternative: merge include files
static_call: move struct static_call_key definition to
static_call_types.h
static_call: add function to query current function
x86/paravirt: switch time pvops functions to use static_call()
x86/alternative: support not-feature
x86/alternative: support ALTERNATIVE_TERNARY
x86/alternative: don't open code ALTERNATIVE_TERNARY() in
_static_cpu_has()
x86: add new features for paravirt patching
x86/paravirt: remove no longer needed 32-bit pvops cruft
x86/paravirt: simplify paravirt macros
x86/paravirt: switch iret pvops to ALTERNATIVE
x86/paravirt: add new macros PVOP_ALT* supporting pvops in
ALTERNATIVEs
x86/paravirt: switch functions with custom code to ALTERNATIVE
x86/paravirt: have only one paravirt patch function
arch/arm/include/asm/paravirt.h | 14 +-
arch/arm/kernel/paravirt.c | 9 +-
arch/arm64/include/asm/paravirt.h | 14 +-
arch/arm64/kernel/paravirt.c | 13 +-
arch/x86/Kconfig | 1 +
arch/x86/entry/entry_32.S | 6 +-
arch/x86/entry/entry_64.S | 2 +-
arch/x86/entry/vdso/vdso32/system_call.S | 2 +-
arch/x86/include/asm/alternative-asm.h | 114 ------------
arch/x86/include/asm/alternative.h | 126 +++++++++++++-
arch/x86/include/asm/cpufeature.h | 41 +----
arch/x86/include/asm/cpufeatures.h | 2 +
arch/x86/include/asm/irqflags.h | 7 +-
arch/x86/include/asm/mshyperv.h | 2 +-
arch/x86/include/asm/nospec-branch.h | 1 -
arch/x86/include/asm/paravirt.h | 167 ++++++++----------
arch/x86/include/asm/paravirt_types.h | 210 +++++++++--------------
arch/x86/include/asm/smap.h | 5 +-
arch/x86/kernel/Makefile | 3 +-
arch/x86/kernel/alternative.c | 52 +++++-
arch/x86/kernel/asm-offsets.c | 7 -
arch/x86/kernel/cpu/vmware.c | 5 +-
arch/x86/kernel/kvm.c | 2 +-
arch/x86/kernel/kvmclock.c | 2 +-
arch/x86/kernel/paravirt-spinlocks.c | 9 +
arch/x86/kernel/paravirt.c | 75 ++------
arch/x86/kernel/paravirt_patch.c | 99 -----------
arch/x86/kernel/tsc.c | 3 +-
arch/x86/lib/atomic64_386_32.S | 2 +-
arch/x86/lib/atomic64_cx8_32.S | 2 +-
arch/x86/lib/copy_page_64.S | 2 +-
arch/x86/lib/copy_user_64.S | 2 +-
arch/x86/lib/memcpy_64.S | 2 +-
arch/x86/lib/memmove_64.S | 2 +-
arch/x86/lib/memset_64.S | 2 +-
arch/x86/lib/retpoline.S | 2 +-
arch/x86/xen/enlighten_pv.c | 4 +-
arch/x86/xen/time.c | 26 +--
drivers/xen/time.c | 3 +-
include/linux/static_call.h | 26 +--
include/linux/static_call_types.h | 18 ++
tools/include/linux/static_call_types.h | 18 ++
42 files changed, 473 insertions(+), 631 deletions(-)
delete mode 100644 arch/x86/include/asm/alternative-asm.h
delete mode 100644 arch/x86/kernel/paravirt_patch.c
--
2.26.2
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH v7 04/14] x86/paravirt: switch time pvops functions to use static_call()
2021-03-11 14:23 [PATCH v7 00/14] x86: major paravirt cleanup Juergen Gross
@ 2021-03-11 14:23 ` Juergen Gross
0 siblings, 0 replies; 2+ messages in thread
From: Juergen Gross @ 2021-03-11 14:23 UTC (permalink / raw)
To: xen-devel, x86, virtualization, linux-arm-kernel, linux-kernel,
linux-hyperv, kvm
Cc: Juergen Gross, Deep Shah, VMware, Inc.,
Russell King, Catalin Marinas, Will Deacon, Thomas Gleixner,
Ingo Molnar, Borislav Petkov, H. Peter Anvin, K. Y. Srinivasan,
Haiyang Zhang, Stephen Hemminger, Wei Liu, Paolo Bonzini,
Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li, Jim Mattson,
Joerg Roedel, Boris Ostrovsky, Stefano Stabellini,
Peter Zijlstra
The time pvops functions are the only ones left which might be
used in 32-bit mode and which return a 64-bit value.
Switch them to use the static_call() mechanism instead of pvops, as
this allows quite some simplification of the pvops implementation.
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
V4:
- drop paravirt_time.h again
- don't move Hyper-V code (Michael Kelley)
V5:
- drop no longer needed Hyper-V modification (Michael Kelley)
- switch Arm and Arm64 to static_call(), too (kernel test robot)
V6:
- factor out common parts in Xen pv/pvh initialization (Boris Petkov)
V7:
- use new function static_call_query()
---
arch/arm/include/asm/paravirt.h | 14 +++++---------
arch/arm/kernel/paravirt.c | 9 +++++++--
arch/arm64/include/asm/paravirt.h | 14 +++++---------
arch/arm64/kernel/paravirt.c | 13 +++++++++----
arch/x86/Kconfig | 1 +
arch/x86/include/asm/mshyperv.h | 2 +-
arch/x86/include/asm/paravirt.h | 15 ++++++++++++---
arch/x86/include/asm/paravirt_types.h | 6 ------
arch/x86/kernel/cpu/vmware.c | 5 +++--
arch/x86/kernel/kvm.c | 2 +-
arch/x86/kernel/kvmclock.c | 2 +-
arch/x86/kernel/paravirt.c | 13 +++++++++----
arch/x86/kernel/tsc.c | 3 ++-
arch/x86/xen/time.c | 26 +++++++++++++-------------
drivers/xen/time.c | 3 ++-
15 files changed, 71 insertions(+), 57 deletions(-)
diff --git a/arch/arm/include/asm/paravirt.h b/arch/arm/include/asm/paravirt.h
index cdbf02d9c1d4..95d5b0d625cd 100644
--- a/arch/arm/include/asm/paravirt.h
+++ b/arch/arm/include/asm/paravirt.h
@@ -3,23 +3,19 @@
#define _ASM_ARM_PARAVIRT_H
#ifdef CONFIG_PARAVIRT
+#include <linux/static_call_types.h>
+
struct static_key;
extern struct static_key paravirt_steal_enabled;
extern struct static_key paravirt_steal_rq_enabled;
-struct pv_time_ops {
- unsigned long long (*steal_clock)(int cpu);
-};
-
-struct paravirt_patch_template {
- struct pv_time_ops time;
-};
+u64 dummy_steal_clock(int cpu);
-extern struct paravirt_patch_template pv_ops;
+DECLARE_STATIC_CALL(pv_steal_clock, dummy_steal_clock);
static inline u64 paravirt_steal_clock(int cpu)
{
- return pv_ops.time.steal_clock(cpu);
+ return static_call(pv_steal_clock)(cpu);
}
#endif
diff --git a/arch/arm/kernel/paravirt.c b/arch/arm/kernel/paravirt.c
index 4cfed91fe256..7dd9806369fb 100644
--- a/arch/arm/kernel/paravirt.c
+++ b/arch/arm/kernel/paravirt.c
@@ -9,10 +9,15 @@
#include <linux/export.h>
#include <linux/jump_label.h>
#include <linux/types.h>
+#include <linux/static_call.h>
#include <asm/paravirt.h>
struct static_key paravirt_steal_enabled;
struct static_key paravirt_steal_rq_enabled;
-struct paravirt_patch_template pv_ops;
-EXPORT_SYMBOL_GPL(pv_ops);
+static u64 native_steal_clock(int cpu)
+{
+ return 0;
+}
+
+DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock);
diff --git a/arch/arm64/include/asm/paravirt.h b/arch/arm64/include/asm/paravirt.h
index cf3a0fd7c1a7..9aa193e0e8f2 100644
--- a/arch/arm64/include/asm/paravirt.h
+++ b/arch/arm64/include/asm/paravirt.h
@@ -3,23 +3,19 @@
#define _ASM_ARM64_PARAVIRT_H
#ifdef CONFIG_PARAVIRT
+#include <linux/static_call_types.h>
+
struct static_key;
extern struct static_key paravirt_steal_enabled;
extern struct static_key paravirt_steal_rq_enabled;
-struct pv_time_ops {
- unsigned long long (*steal_clock)(int cpu);
-};
-
-struct paravirt_patch_template {
- struct pv_time_ops time;
-};
+u64 dummy_steal_clock(int cpu);
-extern struct paravirt_patch_template pv_ops;
+DECLARE_STATIC_CALL(pv_steal_clock, dummy_steal_clock);
static inline u64 paravirt_steal_clock(int cpu)
{
- return pv_ops.time.steal_clock(cpu);
+ return static_call(pv_steal_clock)(cpu);
}
int __init pv_time_init(void);
diff --git a/arch/arm64/kernel/paravirt.c b/arch/arm64/kernel/paravirt.c
index c07d7a034941..75fed4460407 100644
--- a/arch/arm64/kernel/paravirt.c
+++ b/arch/arm64/kernel/paravirt.c
@@ -18,6 +18,7 @@
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include <linux/static_call.h>
#include <asm/paravirt.h>
#include <asm/pvclock-abi.h>
@@ -26,8 +27,12 @@
struct static_key paravirt_steal_enabled;
struct static_key paravirt_steal_rq_enabled;
-struct paravirt_patch_template pv_ops;
-EXPORT_SYMBOL_GPL(pv_ops);
+static u64 native_steal_clock(int cpu)
+{
+ return 0;
+}
+
+DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock);
struct pv_time_stolen_time_region {
struct pvclock_vcpu_stolen_time *kaddr;
@@ -45,7 +50,7 @@ static int __init parse_no_stealacc(char *arg)
early_param("no-steal-acc", parse_no_stealacc);
/* return stolen time in ns by asking the hypervisor */
-static u64 pv_steal_clock(int cpu)
+static u64 para_steal_clock(int cpu)
{
struct pv_time_stolen_time_region *reg;
@@ -150,7 +155,7 @@ int __init pv_time_init(void)
if (ret)
return ret;
- pv_ops.time.steal_clock = pv_steal_clock;
+ static_call_update(pv_steal_clock, para_steal_clock);
static_key_slow_inc(¶virt_steal_enabled);
if (steal_acc)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2792879d398e..107acc403b3b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -777,6 +777,7 @@ if HYPERVISOR_GUEST
config PARAVIRT
bool "Enable paravirtualization code"
+ depends on HAVE_STATIC_CALL
help
This changes the kernel so it can modify itself when it is run
under a hypervisor, potentially improving performance significantly
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index ccf60a809a17..e7be720062a8 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -63,7 +63,7 @@ typedef int (*hyperv_fill_flush_list_func)(
static __always_inline void hv_setup_sched_clock(void *sched_clock)
{
#ifdef CONFIG_PARAVIRT
- pv_ops.time.sched_clock = sched_clock;
+ paravirt_set_sched_clock(sched_clock);
#endif
}
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 4abf110e2243..6408fd0f55ab 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -15,11 +15,20 @@
#include <linux/bug.h>
#include <linux/types.h>
#include <linux/cpumask.h>
+#include <linux/static_call_types.h>
#include <asm/frame.h>
-static inline unsigned long long paravirt_sched_clock(void)
+u64 dummy_steal_clock(int cpu);
+u64 dummy_sched_clock(void);
+
+DECLARE_STATIC_CALL(pv_steal_clock, dummy_steal_clock);
+DECLARE_STATIC_CALL(pv_sched_clock, dummy_sched_clock);
+
+void paravirt_set_sched_clock(u64 (*func)(void));
+
+static inline u64 paravirt_sched_clock(void)
{
- return PVOP_CALL0(unsigned long long, time.sched_clock);
+ return static_call(pv_sched_clock)();
}
struct static_key;
@@ -33,7 +42,7 @@ bool pv_is_native_vcpu_is_preempted(void);
static inline u64 paravirt_steal_clock(int cpu)
{
- return PVOP_CALL1(u64, time.steal_clock, cpu);
+ return static_call(pv_steal_clock)(cpu);
}
/* The paravirtualized I/O functions */
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index de87087d3bde..1fff349e4792 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -95,11 +95,6 @@ struct pv_lazy_ops {
} __no_randomize_layout;
#endif
-struct pv_time_ops {
- unsigned long long (*sched_clock)(void);
- unsigned long long (*steal_clock)(int cpu);
-} __no_randomize_layout;
-
struct pv_cpu_ops {
/* hooks for various privileged instructions */
void (*io_delay)(void);
@@ -291,7 +286,6 @@ struct pv_lock_ops {
* what to patch. */
struct paravirt_patch_template {
struct pv_init_ops init;
- struct pv_time_ops time;
struct pv_cpu_ops cpu;
struct pv_irq_ops irq;
struct pv_mmu_ops mmu;
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index c6ede3b3d302..84fb8e3f3d1b 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -27,6 +27,7 @@
#include <linux/clocksource.h>
#include <linux/cpu.h>
#include <linux/reboot.h>
+#include <linux/static_call.h>
#include <asm/div64.h>
#include <asm/x86_init.h>
#include <asm/hypervisor.h>
@@ -336,11 +337,11 @@ static void __init vmware_paravirt_ops_setup(void)
vmware_cyc2ns_setup();
if (vmw_sched_clock)
- pv_ops.time.sched_clock = vmware_sched_clock;
+ paravirt_set_sched_clock(vmware_sched_clock);
if (vmware_is_stealclock_available()) {
has_steal_clock = true;
- pv_ops.time.steal_clock = vmware_steal_clock;
+ static_call_update(pv_steal_clock, vmware_steal_clock);
/* We use reboot notifier only to disable steal clock */
register_reboot_notifier(&vmware_pv_reboot_nb);
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 5e78e01ca3b4..351ba99f6009 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -650,7 +650,7 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
has_steal_clock = 1;
- pv_ops.time.steal_clock = kvm_steal_clock;
+ static_call_update(pv_steal_clock, kvm_steal_clock);
}
if (pv_tlb_flush_supported()) {
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index aa593743acf6..01e7c1839ace 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -106,7 +106,7 @@ static inline void kvm_sched_clock_init(bool stable)
if (!stable)
clear_sched_clock_stable();
kvm_sched_clock_offset = kvm_clock_read();
- pv_ops.time.sched_clock = kvm_sched_clock_read;
+ paravirt_set_sched_clock(kvm_sched_clock_read);
pr_info("kvm-clock: using sched offset of %llu cycles",
kvm_sched_clock_offset);
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index c60222ab8ab9..a688edf35e31 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -14,6 +14,7 @@
#include <linux/highmem.h>
#include <linux/kprobes.h>
#include <linux/pgtable.h>
+#include <linux/static_call.h>
#include <asm/bug.h>
#include <asm/paravirt.h>
@@ -167,6 +168,14 @@ static u64 native_steal_clock(int cpu)
return 0;
}
+DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock);
+DEFINE_STATIC_CALL(pv_sched_clock, native_sched_clock);
+
+void paravirt_set_sched_clock(u64 (*func)(void))
+{
+ static_call_update(pv_sched_clock, func);
+}
+
/* These are in entry.S */
extern void native_iret(void);
@@ -272,10 +281,6 @@ struct paravirt_patch_template pv_ops = {
/* Init ops. */
.init.patch = native_patch,
- /* Time ops. */
- .time.sched_clock = native_sched_clock,
- .time.steal_clock = native_steal_clock,
-
/* Cpu ops. */
.cpu.io_delay = native_io_delay,
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index f70dffc2771f..9f592923f956 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -14,6 +14,7 @@
#include <linux/percpu.h>
#include <linux/timex.h>
#include <linux/static_key.h>
+#include <linux/static_call.h>
#include <asm/hpet.h>
#include <asm/timer.h>
@@ -254,7 +255,7 @@ unsigned long long sched_clock(void)
bool using_native_sched_clock(void)
{
- return pv_ops.time.sched_clock == native_sched_clock;
+ return static_call_query(pv_sched_clock) == native_sched_clock;
}
#else
unsigned long long
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 91f5b330dcc6..d9c945ee1100 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -379,11 +379,6 @@ void xen_timer_resume(void)
}
}
-static const struct pv_time_ops xen_time_ops __initconst = {
- .sched_clock = xen_sched_clock,
- .steal_clock = xen_steal_clock,
-};
-
static struct pvclock_vsyscall_time_info *xen_clock __read_mostly;
static u64 xen_clock_value_saved;
@@ -525,17 +520,24 @@ static void __init xen_time_init(void)
pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
}
-void __init xen_init_time_ops(void)
+static void __init xen_init_time_common(void)
{
xen_sched_clock_offset = xen_clocksource_read();
- pv_ops.time = xen_time_ops;
+ static_call_update(pv_steal_clock, xen_steal_clock);
+ paravirt_set_sched_clock(xen_sched_clock);
+
+ x86_platform.calibrate_tsc = xen_tsc_khz;
+ x86_platform.get_wallclock = xen_get_wallclock;
+}
+
+void __init xen_init_time_ops(void)
+{
+ xen_init_time_common();
x86_init.timers.timer_init = xen_time_init;
x86_init.timers.setup_percpu_clockev = x86_init_noop;
x86_cpuinit.setup_percpu_clockev = x86_init_noop;
- x86_platform.calibrate_tsc = xen_tsc_khz;
- x86_platform.get_wallclock = xen_get_wallclock;
/* Dom0 uses the native method to set the hardware RTC. */
if (!xen_initial_domain())
x86_platform.set_wallclock = xen_set_wallclock;
@@ -569,13 +571,11 @@ void __init xen_hvm_init_time_ops(void)
return;
}
- xen_sched_clock_offset = xen_clocksource_read();
- pv_ops.time = xen_time_ops;
+ xen_init_time_common();
+
x86_init.timers.setup_percpu_clockev = xen_time_init;
x86_cpuinit.setup_percpu_clockev = xen_hvm_setup_cpu_clockevents;
- x86_platform.calibrate_tsc = xen_tsc_khz;
- x86_platform.get_wallclock = xen_get_wallclock;
x86_platform.set_wallclock = xen_set_wallclock;
}
#endif
diff --git a/drivers/xen/time.c b/drivers/xen/time.c
index 108edbcbc040..152dd33bb223 100644
--- a/drivers/xen/time.c
+++ b/drivers/xen/time.c
@@ -7,6 +7,7 @@
#include <linux/math64.h>
#include <linux/gfp.h>
#include <linux/slab.h>
+#include <linux/static_call.h>
#include <asm/paravirt.h>
#include <asm/xen/hypervisor.h>
@@ -175,7 +176,7 @@ void __init xen_time_setup_guest(void)
xen_runstate_remote = !HYPERVISOR_vm_assist(VMASST_CMD_enable,
VMASST_TYPE_runstate_update_flag);
- pv_ops.time.steal_clock = xen_steal_clock;
+ static_call_update(pv_steal_clock, xen_steal_clock);
static_key_slow_inc(¶virt_steal_enabled);
if (xen_runstate_remote)
--
2.26.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
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2021-03-11 14:23 [PATCH v7 00/14] x86: major paravirt cleanup Juergen Gross
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