* [PATCH v7 1/4] KVM: x86: Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault
2022-05-24 13:56 [PATCH v7 0/4] Introduce Notify VM exit Chenyi Qiang
@ 2022-05-24 13:56 ` Chenyi Qiang
2022-05-24 13:56 ` [PATCH v7 2/4] KVM: selftests: Add a test to get/set triple fault event Chenyi Qiang
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Chenyi Qiang @ 2022-05-24 13:56 UTC (permalink / raw)
To: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Xiaoyao Li
Cc: kvm, linux-kernel, Chenyi Qiang
For the triple fault sythesized by KVM, e.g. the RSM path or
nested_vmx_abort(), if KVM exits to userspace before the request is
serviced, userspace could migrate the VM and lose the triple fault.
Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault with a
new event KVM_VCPUEVENT_VALID_FAULT_FAULT so that userspace can save and
restore the triple fault event. This extension is guarded by a new KVM
capability KVM_CAP_TRIPLE_FAULT_EVENT.
Note that in the set_vcpu_events path, userspace is able to set/clear
the triple fault request through triple_fault.pending field.
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
Documentation/virt/kvm/api.rst | 8 ++++++++
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/include/uapi/asm/kvm.h | 6 +++++-
arch/x86/kvm/x86.c | 21 ++++++++++++++++++++-
include/uapi/linux/kvm.h | 1 +
5 files changed, 36 insertions(+), 2 deletions(-)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 23baf7fce038..d219523bdb70 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -1150,6 +1150,10 @@ The following bits are defined in the flags field:
fields contain a valid state. This bit will be set whenever
KVM_CAP_EXCEPTION_PAYLOAD is enabled.
+- KVM_VCPUEVENT_VALID_TRIPLE_FAULT may be set to signal that the
+ triple_fault_pending field contains a valid state. This bit will
+ be set whenever KVM_CAP_TRIPLE_FAULT_EVENT is enabled.
+
ARM64:
^^^^^^
@@ -1245,6 +1249,10 @@ can be set in the flags field to signal that the
exception_has_payload, exception_payload, and exception.pending fields
contain a valid state and shall be written into the VCPU.
+If KVM_CAP_TRIPLE_FAULT_EVENT is enabled, KVM_VCPUEVENT_VALID_TRIPLE_FAULT
+can be set in flags field to signal that the triple_fault field contains
+a valid state and shall be written into the VCPU.
+
ARM64:
^^^^^^
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9cdc5bbd721f..5b264a24652d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1174,6 +1174,8 @@ struct kvm_arch {
bool guest_can_read_msr_platform_info;
bool exception_payload_enabled;
+ bool triple_fault_event;
+
bool bus_lock_detection_enabled;
bool enable_pmu;
/*
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 21614807a2cb..24c807c8d5f7 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -325,6 +325,7 @@ struct kvm_reinject_control {
#define KVM_VCPUEVENT_VALID_SHADOW 0x00000004
#define KVM_VCPUEVENT_VALID_SMM 0x00000008
#define KVM_VCPUEVENT_VALID_PAYLOAD 0x00000010
+#define KVM_VCPUEVENT_VALID_TRIPLE_FAULT 0x00000020
/* Interrupt shadow states */
#define KVM_X86_SHADOW_INT_MOV_SS 0x01
@@ -359,7 +360,10 @@ struct kvm_vcpu_events {
__u8 smm_inside_nmi;
__u8 latched_init;
} smi;
- __u8 reserved[27];
+ struct {
+ __u8 pending;
+ } triple_fault;
+ __u8 reserved[26];
__u8 exception_has_payload;
__u64 exception_payload;
};
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 04812eaaf61b..e27ccfc88d15 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4293,6 +4293,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_GET_MSR_FEATURES:
case KVM_CAP_MSR_PLATFORM_INFO:
case KVM_CAP_EXCEPTION_PAYLOAD:
+ case KVM_CAP_TRIPLE_FAULT_EVENT:
case KVM_CAP_SET_GUEST_DEBUG:
case KVM_CAP_LAST_CPU:
case KVM_CAP_X86_USER_SPACE_MSR:
@@ -4939,6 +4940,10 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
| KVM_VCPUEVENT_VALID_SMM);
if (vcpu->kvm->arch.exception_payload_enabled)
events->flags |= KVM_VCPUEVENT_VALID_PAYLOAD;
+ if (vcpu->kvm->arch.triple_fault_event) {
+ events->triple_fault.pending = kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu);
+ events->flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT;
+ }
memset(&events->reserved, 0, sizeof(events->reserved));
}
@@ -4952,7 +4957,8 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
| KVM_VCPUEVENT_VALID_SIPI_VECTOR
| KVM_VCPUEVENT_VALID_SHADOW
| KVM_VCPUEVENT_VALID_SMM
- | KVM_VCPUEVENT_VALID_PAYLOAD))
+ | KVM_VCPUEVENT_VALID_PAYLOAD
+ | KVM_VCPUEVENT_VALID_TRIPLE_FAULT))
return -EINVAL;
if (events->flags & KVM_VCPUEVENT_VALID_PAYLOAD) {
@@ -5025,6 +5031,15 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
}
}
+ if (events->flags & KVM_VCPUEVENT_VALID_TRIPLE_FAULT) {
+ if (!vcpu->kvm->arch.triple_fault_event)
+ return -EINVAL;
+ if (events->triple_fault.pending)
+ kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
+ else
+ kvm_clear_request(KVM_REQ_TRIPLE_FAULT, vcpu);
+ }
+
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
@@ -6026,6 +6041,10 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
kvm->arch.exception_payload_enabled = cap->args[0];
r = 0;
break;
+ case KVM_CAP_TRIPLE_FAULT_EVENT:
+ kvm->arch.triple_fault_event = cap->args[0];
+ r = 0;
+ break;
case KVM_CAP_X86_USER_SPACE_MSR:
kvm->arch.user_space_msr_mask = cap->args[0];
r = 0;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index e10d131edd80..ec75b56229c7 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1153,6 +1153,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_DISABLE_QUIRKS2 213
#define KVM_CAP_VM_TSC_CONTROL 214
#define KVM_CAP_SYSTEM_EVENT_DATA 215
+#define KVM_CAP_TRIPLE_FAULT_EVENT 216
#ifdef KVM_CAP_IRQ_ROUTING
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v7 2/4] KVM: selftests: Add a test to get/set triple fault event
2022-05-24 13:56 [PATCH v7 0/4] Introduce Notify VM exit Chenyi Qiang
2022-05-24 13:56 ` [PATCH v7 1/4] KVM: x86: Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault Chenyi Qiang
@ 2022-05-24 13:56 ` Chenyi Qiang
2022-05-24 13:56 ` [PATCH v7 3/4] KVM: x86: Introduce "struct kvm_caps" to track misc caps/settings Chenyi Qiang
2022-05-24 13:56 ` [PATCH v7 4/4] KVM: VMX: Enable Notify VM exit Chenyi Qiang
3 siblings, 0 replies; 5+ messages in thread
From: Chenyi Qiang @ 2022-05-24 13:56 UTC (permalink / raw)
To: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Xiaoyao Li
Cc: kvm, linux-kernel, Chenyi Qiang
Add a selftest for triple fault event:
- launch the L2 and exit to userspace via I/O.
- using KVM_SET_VCPU_EVENTS to pend a triple fault event.
- with the immediate_exit, check the triple fault is pending.
- run for real with pending triple fault and L1 can see the triple
fault.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 1 +
.../kvm/x86_64/triple_fault_event_test.c | 101 ++++++++++++++++++
3 files changed, 103 insertions(+)
create mode 100644 tools/testing/selftests/kvm/x86_64/triple_fault_event_test.c
diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 4f48f9c2411d..1cf23869b04a 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -56,6 +56,7 @@
/x86_64/xen_vmcall_test
/x86_64/xss_msr_test
/x86_64/vmx_pmu_msrs_test
+/x86_64/triple_fault_event_test
/access_tracking_perf_test
/demand_paging_test
/dirty_log_test
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 8c3db2f75315..6711cc1871f6 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -89,6 +89,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test
TEST_GEN_PROGS_x86_64 += x86_64/sev_migrate_tests
TEST_GEN_PROGS_x86_64 += x86_64/amx_test
TEST_GEN_PROGS_x86_64 += x86_64/max_vcpuid_cap_test
+TEST_GEN_PROGS_x86_64 += x86_64/triple_fault_event_test
TEST_GEN_PROGS_x86_64 += access_tracking_perf_test
TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += dirty_log_test
diff --git a/tools/testing/selftests/kvm/x86_64/triple_fault_event_test.c b/tools/testing/selftests/kvm/x86_64/triple_fault_event_test.c
new file mode 100644
index 000000000000..6e1de0631ce9
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/triple_fault_event_test.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+#include "vmx.h"
+
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "kselftest.h"
+
+#define VCPU_ID 0
+#define ARBITRARY_IO_PORT 0x2000
+
+/* The virtual machine object. */
+static struct kvm_vm *vm;
+
+static void l2_guest_code(void)
+{
+ asm volatile("inb %%dx, %%al"
+ : : [port] "d" (ARBITRARY_IO_PORT) : "rax");
+}
+
+void l1_guest_code(struct vmx_pages *vmx)
+{
+#define L2_GUEST_STACK_SIZE 64
+ unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
+
+ GUEST_ASSERT(vmx->vmcs_gpa);
+ GUEST_ASSERT(prepare_for_vmx_operation(vmx));
+ GUEST_ASSERT(load_vmcs(vmx));
+
+ prepare_vmcs(vmx, l2_guest_code,
+ &l2_guest_stack[L2_GUEST_STACK_SIZE]);
+
+ GUEST_ASSERT(!vmlaunch());
+ /* L2 should triple fault after a triple fault event injected. */
+ GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_TRIPLE_FAULT);
+ GUEST_DONE();
+}
+
+int main(void)
+{
+ struct kvm_run *run;
+ struct kvm_vcpu_events events;
+ vm_vaddr_t vmx_pages_gva;
+ struct ucall uc;
+
+ struct kvm_enable_cap cap = {
+ .cap = KVM_CAP_TRIPLE_FAULT_EVENT,
+ .args = {1}
+ };
+
+ if (!nested_vmx_supported()) {
+ print_skip("Nested VMX not supported");
+ exit(KSFT_SKIP);
+ }
+
+ if (!kvm_check_cap(KVM_CAP_TRIPLE_FAULT_EVENT)) {
+ print_skip("KVM_CAP_TRIPLE_FAULT_EVENT not supported");
+ exit(KSFT_SKIP);
+ }
+
+ vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
+ vm_enable_cap(vm, &cap);
+
+ run = vcpu_state(vm, VCPU_ID);
+ vcpu_alloc_vmx(vm, &vmx_pages_gva);
+ vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
+ vcpu_run(vm, VCPU_ID);
+
+ TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
+ "Expected KVM_EXIT_IO, got: %u (%s)\n",
+ run->exit_reason, exit_reason_str(run->exit_reason));
+ TEST_ASSERT(run->io.port == ARBITRARY_IO_PORT,
+ "Expected IN from port %d from L2, got port %d",
+ ARBITRARY_IO_PORT, run->io.port);
+ vcpu_events_get(vm, VCPU_ID, &events);
+ events.flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT;
+ events.triple_fault.pending = true;
+ vcpu_events_set(vm, VCPU_ID, &events);
+ run->immediate_exit = true;
+ vcpu_run_complete_io(vm, VCPU_ID);
+
+ vcpu_events_get(vm, VCPU_ID, &events);
+ TEST_ASSERT(events.flags & KVM_VCPUEVENT_VALID_TRIPLE_FAULT,
+ "Triple fault event invalid");
+ TEST_ASSERT(events.triple_fault.pending,
+ "No triple fault pending");
+ vcpu_run(vm, VCPU_ID);
+
+ switch (get_ucall(vm, VCPU_ID, &uc)) {
+ case UCALL_DONE:
+ break;
+ case UCALL_ABORT:
+ TEST_FAIL("%s", (const char *)uc.args[0]);
+ default:
+ TEST_FAIL("Unexpected ucall: %lu", uc.cmd);
+ }
+
+}
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v7 3/4] KVM: x86: Introduce "struct kvm_caps" to track misc caps/settings
2022-05-24 13:56 [PATCH v7 0/4] Introduce Notify VM exit Chenyi Qiang
2022-05-24 13:56 ` [PATCH v7 1/4] KVM: x86: Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault Chenyi Qiang
2022-05-24 13:56 ` [PATCH v7 2/4] KVM: selftests: Add a test to get/set triple fault event Chenyi Qiang
@ 2022-05-24 13:56 ` Chenyi Qiang
2022-05-24 13:56 ` [PATCH v7 4/4] KVM: VMX: Enable Notify VM exit Chenyi Qiang
3 siblings, 0 replies; 5+ messages in thread
From: Chenyi Qiang @ 2022-05-24 13:56 UTC (permalink / raw)
To: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Xiaoyao Li
Cc: kvm, linux-kernel
From: Sean Christopherson <seanjc@google.com>
Add kvm_caps to hold a variety of capabilites and defaults that aren't
handled by kvm_cpu_caps because they aren't CPUID bits in order to reduce
the amount of boilerplate code required to add a new feature. The vast
majority (all?) of the caps interact with vendor code and are written
only during initialization, i.e. should be tagged __read_mostly, declared
extern in x86.h, and exported.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/include/asm/kvm_host.h | 15 -----
arch/x86/kvm/cpuid.c | 8 +--
arch/x86/kvm/debugfs.c | 4 +-
arch/x86/kvm/lapic.c | 2 +-
arch/x86/kvm/svm/nested.c | 4 +-
arch/x86/kvm/svm/svm.c | 13 +++--
arch/x86/kvm/vmx/nested.c | 4 +-
arch/x86/kvm/vmx/vmx.c | 22 ++++----
arch/x86/kvm/x86.c | 97 ++++++++++++++-------------------
arch/x86/kvm/x86.h | 26 ++++++++-
10 files changed, 94 insertions(+), 101 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5b264a24652d..270460e9f3b1 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1663,21 +1663,6 @@ extern bool tdp_enabled;
u64 vcpu_tsc_khz(struct kvm_vcpu *vcpu);
-/* control of guest tsc rate supported? */
-extern bool kvm_has_tsc_control;
-/* maximum supported tsc_khz for guests */
-extern u32 kvm_max_guest_tsc_khz;
-/* number of bits of the fractional part of the TSC scaling ratio */
-extern u8 kvm_tsc_scaling_ratio_frac_bits;
-/* maximum allowed value of TSC scaling ratio */
-extern u64 kvm_max_tsc_scaling_ratio;
-/* 1ull << kvm_tsc_scaling_ratio_frac_bits */
-extern u64 kvm_default_tsc_scaling_ratio;
-/* bus lock detection supported? */
-extern bool kvm_has_bus_lock_exit;
-
-extern u64 kvm_mce_cap_supported;
-
/*
* EMULTYPE_NO_DECODE - Set when re-emulating an instruction (after completing
* userspace I/O) to indicate that the emulation context
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 8c1a3b2430a8..6822fc9ae86d 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -199,7 +199,7 @@ void kvm_update_pv_runtime(struct kvm_vcpu *vcpu)
/*
* Calculate guest's supported XCR0 taking into account guest CPUID data and
- * supported_xcr0 (comprised of host configuration and KVM_SUPPORTED_XCR0).
+ * KVM's supported XCR0 (comprised of host's XCR0 and KVM_SUPPORTED_XCR0).
*/
static u64 cpuid_get_supported_xcr0(struct kvm_cpuid_entry2 *entries, int nent)
{
@@ -209,7 +209,7 @@ static u64 cpuid_get_supported_xcr0(struct kvm_cpuid_entry2 *entries, int nent)
if (!best)
return 0;
- return (best->eax | ((u64)best->edx << 32)) & supported_xcr0;
+ return (best->eax | ((u64)best->edx << 32)) & kvm_caps.supported_xcr0;
}
static void __kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 *entries,
@@ -927,8 +927,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
}
break;
case 0xd: {
- u64 permitted_xcr0 = supported_xcr0 & xstate_get_guest_group_perm();
- u64 permitted_xss = supported_xss;
+ u64 permitted_xcr0 = kvm_caps.supported_xcr0 & xstate_get_guest_group_perm();
+ u64 permitted_xss = kvm_caps.supported_xss;
entry->eax &= permitted_xcr0;
entry->ebx = xstate_required_size(permitted_xcr0, false);
diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c
index 9240b3b7f8dd..cfed36aba2f7 100644
--- a/arch/x86/kvm/debugfs.c
+++ b/arch/x86/kvm/debugfs.c
@@ -48,7 +48,7 @@ DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL,
static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val)
{
- *val = kvm_tsc_scaling_ratio_frac_bits;
+ *val = kvm_caps.tsc_scaling_ratio_frac_bits;
return 0;
}
@@ -66,7 +66,7 @@ void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_
debugfs_dentry, vcpu,
&vcpu_timer_advance_ns_fops);
- if (kvm_has_tsc_control) {
+ if (kvm_caps.has_tsc_control) {
debugfs_create_file("tsc-scaling-ratio", 0444,
debugfs_dentry, vcpu,
&vcpu_tsc_scaling_fops);
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 21ab69db689b..5fd678c90288 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1602,7 +1602,7 @@ static inline void __wait_lapic_expire(struct kvm_vcpu *vcpu, u64 guest_cycles)
* that __delay() uses delay_tsc whenever the hardware has TSC, thus
* always for VMX enabled hardware.
*/
- if (vcpu->arch.tsc_scaling_ratio == kvm_default_tsc_scaling_ratio) {
+ if (vcpu->arch.tsc_scaling_ratio == kvm_caps.default_tsc_scaling_ratio) {
__delay(min(guest_cycles,
nsec_to_cycles(vcpu, timer_advance_ns)));
} else {
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index bed5e1692cef..d14370cec23a 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -648,7 +648,7 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
vmcb02->control.tsc_offset = vcpu->arch.tsc_offset;
- if (svm->tsc_ratio_msr != kvm_default_tsc_scaling_ratio) {
+ if (svm->tsc_ratio_msr != kvm_caps.default_tsc_scaling_ratio) {
WARN_ON(!svm->tsc_scaling_enabled);
nested_svm_update_tsc_ratio_msr(vcpu);
}
@@ -979,7 +979,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
vmcb_mark_dirty(vmcb01, VMCB_INTERCEPTS);
}
- if (svm->tsc_ratio_msr != kvm_default_tsc_scaling_ratio) {
+ if (svm->tsc_ratio_msr != kvm_caps.default_tsc_scaling_ratio) {
WARN_ON(!svm->tsc_scaling_enabled);
vcpu->arch.tsc_scaling_ratio = vcpu->arch.l1_tsc_scaling_ratio;
svm_write_tsc_multiplier(vcpu, vcpu->arch.tsc_scaling_ratio);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 3b49337998ec..480eef001074 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1225,7 +1225,7 @@ static void __svm_vcpu_reset(struct kvm_vcpu *vcpu)
svm_init_osvw(vcpu);
vcpu->arch.microcode_version = 0x01000065;
- svm->tsc_ratio_msr = kvm_default_tsc_scaling_ratio;
+ svm->tsc_ratio_msr = kvm_caps.default_tsc_scaling_ratio;
if (sev_es_guest(vcpu->kvm))
sev_es_vcpu_reset(svm);
@@ -4769,7 +4769,7 @@ static __init void svm_set_cpu_caps(void)
{
kvm_set_cpu_caps();
- supported_xss = 0;
+ kvm_caps.supported_xss = 0;
/* CPUID 0x80000001 and 0x8000000A (SVM features) */
if (nested) {
@@ -4845,7 +4845,8 @@ static __init int svm_hardware_setup(void)
init_msrpm_offsets();
- supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
+ kvm_caps.supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS |
+ XFEATURE_MASK_BNDCSR);
if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
kvm_enable_efer_bits(EFER_FFXSR);
@@ -4855,11 +4856,11 @@ static __init int svm_hardware_setup(void)
tsc_scaling = false;
} else {
pr_info("TSC scaling supported\n");
- kvm_has_tsc_control = true;
+ kvm_caps.has_tsc_control = true;
}
}
- kvm_max_tsc_scaling_ratio = SVM_TSC_RATIO_MAX;
- kvm_tsc_scaling_ratio_frac_bits = 32;
+ kvm_caps.max_tsc_scaling_ratio = SVM_TSC_RATIO_MAX;
+ kvm_caps.tsc_scaling_ratio_frac_bits = 32;
tsc_aux_uret_slot = kvm_add_user_return_msr(MSR_TSC_AUX);
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index a6688663da4d..aab4745eb1ee 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2548,7 +2548,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
vmx_get_l2_tsc_multiplier(vcpu));
vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset);
- if (kvm_has_tsc_control)
+ if (kvm_caps.has_tsc_control)
vmcs_write64(TSC_MULTIPLIER, vcpu->arch.tsc_scaling_ratio);
nested_vmx_transition_tlb_flush(vcpu, vmcs12, true);
@@ -4610,7 +4610,7 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset);
- if (kvm_has_tsc_control)
+ if (kvm_caps.has_tsc_control)
vmcs_write64(TSC_MULTIPLIER, vcpu->arch.tsc_scaling_ratio);
if (vmx->nested.l1_tpr_threshold != -1)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 8bbcf2071faf..b06eafa5884d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1715,7 +1715,7 @@ u64 vmx_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu)
nested_cpu_has2(vmcs12, SECONDARY_EXEC_TSC_SCALING))
return vmcs12->tsc_multiplier;
- return kvm_default_tsc_scaling_ratio;
+ return kvm_caps.default_tsc_scaling_ratio;
}
static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
@@ -7537,7 +7537,7 @@ static __init void vmx_set_cpu_caps(void)
kvm_cpu_cap_set(X86_FEATURE_UMIP);
/* CPUID 0xD.1 */
- supported_xss = 0;
+ kvm_caps.supported_xss = 0;
if (!cpu_has_vmx_xsaves())
kvm_cpu_cap_clear(X86_FEATURE_XSAVES);
@@ -7678,9 +7678,9 @@ static int vmx_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc,
delta_tsc = 0;
/* Convert to host delta tsc if tsc scaling is enabled */
- if (vcpu->arch.l1_tsc_scaling_ratio != kvm_default_tsc_scaling_ratio &&
+ if (vcpu->arch.l1_tsc_scaling_ratio != kvm_caps.default_tsc_scaling_ratio &&
delta_tsc && u64_shl_div_u64(delta_tsc,
- kvm_tsc_scaling_ratio_frac_bits,
+ kvm_caps.tsc_scaling_ratio_frac_bits,
vcpu->arch.l1_tsc_scaling_ratio, &delta_tsc))
return -ERANGE;
@@ -8057,8 +8057,8 @@ static __init int hardware_setup(void)
}
if (!cpu_has_vmx_mpx())
- supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS |
- XFEATURE_MASK_BNDCSR);
+ kvm_caps.supported_xcr0 &= ~(XFEATURE_MASK_BNDREGS |
+ XFEATURE_MASK_BNDCSR);
if (!cpu_has_vmx_vpid() || !cpu_has_vmx_invvpid() ||
!(cpu_has_vmx_invvpid_single() || cpu_has_vmx_invvpid_global()))
@@ -8125,11 +8125,11 @@ static __init int hardware_setup(void)
enable_ipiv = false;
if (cpu_has_vmx_tsc_scaling())
- kvm_has_tsc_control = true;
+ kvm_caps.has_tsc_control = true;
- kvm_max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX;
- kvm_tsc_scaling_ratio_frac_bits = 48;
- kvm_has_bus_lock_exit = cpu_has_vmx_bus_lock_detection();
+ kvm_caps.max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX;
+ kvm_caps.tsc_scaling_ratio_frac_bits = 48;
+ kvm_caps.has_bus_lock_exit = cpu_has_vmx_bus_lock_detection();
set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
@@ -8186,7 +8186,7 @@ static __init int hardware_setup(void)
vmx_x86_ops.request_immediate_exit = __kvm_request_immediate_exit;
}
- kvm_mce_cap_supported |= MCG_LMCE_P;
+ kvm_caps.supported_mce_cap |= MCG_LMCE_P;
if (pt_mode != PT_MODE_SYSTEM && pt_mode != PT_MODE_HOST_GUEST)
return -EINVAL;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e27ccfc88d15..d745d87835e2 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -87,8 +87,11 @@
#define MAX_IO_MSRS 256
#define KVM_MAX_MCE_BANKS 32
-u64 __read_mostly kvm_mce_cap_supported = MCG_CTL_P | MCG_SER_P;
-EXPORT_SYMBOL_GPL(kvm_mce_cap_supported);
+
+struct kvm_caps kvm_caps __read_mostly = {
+ .supported_mce_cap = MCG_CTL_P | MCG_SER_P,
+};
+EXPORT_SYMBOL_GPL(kvm_caps);
#define ERR_PTR_USR(e) ((void __user *)ERR_PTR(e))
@@ -151,19 +154,6 @@ module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
static bool __read_mostly kvmclock_periodic_sync = true;
module_param(kvmclock_periodic_sync, bool, S_IRUGO);
-bool __read_mostly kvm_has_tsc_control;
-EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
-u32 __read_mostly kvm_max_guest_tsc_khz;
-EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
-u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits;
-EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits);
-u64 __read_mostly kvm_max_tsc_scaling_ratio;
-EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio);
-u64 __read_mostly kvm_default_tsc_scaling_ratio;
-EXPORT_SYMBOL_GPL(kvm_default_tsc_scaling_ratio);
-bool __read_mostly kvm_has_bus_lock_exit;
-EXPORT_SYMBOL_GPL(kvm_has_bus_lock_exit);
-
/* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
static u32 __read_mostly tsc_tolerance_ppm = 250;
module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
@@ -235,8 +225,6 @@ EXPORT_SYMBOL_GPL(enable_apicv);
u64 __read_mostly host_xss;
EXPORT_SYMBOL_GPL(host_xss);
-u64 __read_mostly supported_xss;
-EXPORT_SYMBOL_GPL(supported_xss);
const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
@@ -309,8 +297,6 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
};
u64 __read_mostly host_xcr0;
-u64 __read_mostly supported_xcr0;
-EXPORT_SYMBOL_GPL(supported_xcr0);
static struct kmem_cache *x86_emulator_cache;
@@ -2345,12 +2331,12 @@ static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
/* Guest TSC same frequency as host TSC? */
if (!scale) {
- kvm_vcpu_write_tsc_multiplier(vcpu, kvm_default_tsc_scaling_ratio);
+ kvm_vcpu_write_tsc_multiplier(vcpu, kvm_caps.default_tsc_scaling_ratio);
return 0;
}
/* TSC scaling supported? */
- if (!kvm_has_tsc_control) {
+ if (!kvm_caps.has_tsc_control) {
if (user_tsc_khz > tsc_khz) {
vcpu->arch.tsc_catchup = 1;
vcpu->arch.tsc_always_catchup = 1;
@@ -2362,10 +2348,10 @@ static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
}
/* TSC scaling required - calculate ratio */
- ratio = mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits,
+ ratio = mul_u64_u32_div(1ULL << kvm_caps.tsc_scaling_ratio_frac_bits,
user_tsc_khz, tsc_khz);
- if (ratio == 0 || ratio >= kvm_max_tsc_scaling_ratio) {
+ if (ratio == 0 || ratio >= kvm_caps.max_tsc_scaling_ratio) {
pr_warn_ratelimited("Invalid TSC scaling ratio - virtual-tsc-khz=%u\n",
user_tsc_khz);
return -1;
@@ -2383,7 +2369,7 @@ static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
/* tsc_khz can be zero if TSC calibration fails */
if (user_tsc_khz == 0) {
/* set tsc_scaling_ratio to a safe value */
- kvm_vcpu_write_tsc_multiplier(vcpu, kvm_default_tsc_scaling_ratio);
+ kvm_vcpu_write_tsc_multiplier(vcpu, kvm_caps.default_tsc_scaling_ratio);
return -1;
}
@@ -2460,18 +2446,18 @@ static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu)
* (frac) represent the fractional part, ie. ratio represents a fixed
* point number (mult + frac * 2^(-N)).
*
- * N equals to kvm_tsc_scaling_ratio_frac_bits.
+ * N equals to kvm_caps.tsc_scaling_ratio_frac_bits.
*/
static inline u64 __scale_tsc(u64 ratio, u64 tsc)
{
- return mul_u64_u64_shr(tsc, ratio, kvm_tsc_scaling_ratio_frac_bits);
+ return mul_u64_u64_shr(tsc, ratio, kvm_caps.tsc_scaling_ratio_frac_bits);
}
u64 kvm_scale_tsc(u64 tsc, u64 ratio)
{
u64 _tsc = tsc;
- if (ratio != kvm_default_tsc_scaling_ratio)
+ if (ratio != kvm_caps.default_tsc_scaling_ratio)
_tsc = __scale_tsc(ratio, tsc);
return _tsc;
@@ -2498,11 +2484,11 @@ u64 kvm_calc_nested_tsc_offset(u64 l1_offset, u64 l2_offset, u64 l2_multiplier)
{
u64 nested_offset;
- if (l2_multiplier == kvm_default_tsc_scaling_ratio)
+ if (l2_multiplier == kvm_caps.default_tsc_scaling_ratio)
nested_offset = l1_offset;
else
nested_offset = mul_s64_u64_shr((s64) l1_offset, l2_multiplier,
- kvm_tsc_scaling_ratio_frac_bits);
+ kvm_caps.tsc_scaling_ratio_frac_bits);
nested_offset += l2_offset;
return nested_offset;
@@ -2511,9 +2497,9 @@ EXPORT_SYMBOL_GPL(kvm_calc_nested_tsc_offset);
u64 kvm_calc_nested_tsc_multiplier(u64 l1_multiplier, u64 l2_multiplier)
{
- if (l2_multiplier != kvm_default_tsc_scaling_ratio)
+ if (l2_multiplier != kvm_caps.default_tsc_scaling_ratio)
return mul_u64_u64_shr(l1_multiplier, l2_multiplier,
- kvm_tsc_scaling_ratio_frac_bits);
+ kvm_caps.tsc_scaling_ratio_frac_bits);
return l1_multiplier;
}
@@ -2555,7 +2541,7 @@ static void kvm_vcpu_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 l1_multipli
else
vcpu->arch.tsc_scaling_ratio = l1_multiplier;
- if (kvm_has_tsc_control)
+ if (kvm_caps.has_tsc_control)
static_call(kvm_x86_write_tsc_multiplier)(
vcpu, vcpu->arch.tsc_scaling_ratio);
}
@@ -2691,7 +2677,7 @@ static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
{
- if (vcpu->arch.l1_tsc_scaling_ratio != kvm_default_tsc_scaling_ratio)
+ if (vcpu->arch.l1_tsc_scaling_ratio != kvm_caps.default_tsc_scaling_ratio)
WARN_ON(adjustment < 0);
adjustment = kvm_scale_tsc((u64) adjustment,
vcpu->arch.l1_tsc_scaling_ratio);
@@ -3104,7 +3090,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
/* With all the info we got, fill in the values */
- if (kvm_has_tsc_control)
+ if (kvm_caps.has_tsc_control)
tgt_tsc_khz = kvm_scale_tsc(tgt_tsc_khz,
v->arch.l1_tsc_scaling_ratio);
@@ -3610,7 +3596,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
* IA32_XSS[bit 8]. Guests have to use RDMSR/WRMSR rather than
* XSAVES/XRSTORS to save/restore PT MSRs.
*/
- if (data & ~supported_xss)
+ if (data & ~kvm_caps.supported_xss)
return 1;
vcpu->arch.ia32_xss = data;
kvm_update_cpuid_runtime(vcpu);
@@ -4371,7 +4357,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
break;
case KVM_CAP_TSC_CONTROL:
case KVM_CAP_VM_TSC_CONTROL:
- r = kvm_has_tsc_control;
+ r = kvm_caps.has_tsc_control;
break;
case KVM_CAP_X2APIC_API:
r = KVM_X2APIC_API_VALID_FLAGS;
@@ -4393,7 +4379,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = sched_info_on();
break;
case KVM_CAP_X86_BUS_LOCK_EXIT:
- if (kvm_has_bus_lock_exit)
+ if (kvm_caps.has_bus_lock_exit)
r = KVM_BUS_LOCK_DETECTION_OFF |
KVM_BUS_LOCK_DETECTION_EXIT;
else
@@ -4402,7 +4388,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_XSAVE2: {
u64 guest_perm = xstate_get_guest_group_perm();
- r = xstate_required_size(supported_xcr0 & guest_perm, false);
+ r = xstate_required_size(kvm_caps.supported_xcr0 & guest_perm, false);
if (r < sizeof(struct kvm_xsave))
r = sizeof(struct kvm_xsave);
break;
@@ -4440,7 +4426,7 @@ static int kvm_x86_dev_get_attr(struct kvm_device_attr *attr)
switch (attr->attr) {
case KVM_X86_XCOMP_GUEST_SUPP:
- if (put_user(supported_xcr0, uaddr))
+ if (put_user(kvm_caps.supported_xcr0, uaddr))
return -EFAULT;
return 0;
default:
@@ -4517,8 +4503,8 @@ long kvm_arch_dev_ioctl(struct file *filp,
}
case KVM_X86_GET_MCE_CAP_SUPPORTED:
r = -EFAULT;
- if (copy_to_user(argp, &kvm_mce_cap_supported,
- sizeof(kvm_mce_cap_supported)))
+ if (copy_to_user(argp, &kvm_caps.supported_mce_cap,
+ sizeof(kvm_caps.supported_mce_cap)))
goto out;
r = 0;
break;
@@ -4802,7 +4788,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
r = -EINVAL;
if (!bank_num || bank_num > KVM_MAX_MCE_BANKS)
goto out;
- if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000))
+ if (mcg_cap & ~(kvm_caps.supported_mce_cap | 0xff | 0xff0000))
goto out;
r = 0;
vcpu->arch.mcg_cap = mcg_cap;
@@ -5108,7 +5094,8 @@ static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
return fpu_copy_uabi_to_guest_fpstate(&vcpu->arch.guest_fpu,
guest_xsave->region,
- supported_xcr0, &vcpu->arch.pkru);
+ kvm_caps.supported_xcr0,
+ &vcpu->arch.pkru);
}
static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
@@ -5613,8 +5600,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = -EINVAL;
user_tsc_khz = (u32)arg;
- if (kvm_has_tsc_control &&
- user_tsc_khz >= kvm_max_guest_tsc_khz)
+ if (kvm_caps.has_tsc_control &&
+ user_tsc_khz >= kvm_caps.max_guest_tsc_khz)
goto out;
if (user_tsc_khz == 0)
@@ -6058,7 +6045,7 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
(cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT))
break;
- if (kvm_has_bus_lock_exit &&
+ if (kvm_caps.has_bus_lock_exit &&
cap->args[0] & KVM_BUS_LOCK_DETECTION_EXIT)
kvm->arch.bus_lock_detection_enabled = true;
r = 0;
@@ -6607,8 +6594,8 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = -EINVAL;
user_tsc_khz = (u32)arg;
- if (kvm_has_tsc_control &&
- user_tsc_khz >= kvm_max_guest_tsc_khz)
+ if (kvm_caps.has_tsc_control &&
+ user_tsc_khz >= kvm_caps.max_guest_tsc_khz)
goto out;
if (user_tsc_khz == 0)
@@ -8764,7 +8751,7 @@ static void kvm_hyperv_tsc_notifier(void)
/* TSC frequency always matches when on Hyper-V */
for_each_present_cpu(cpu)
per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
- kvm_max_guest_tsc_khz = tsc_khz;
+ kvm_caps.max_guest_tsc_khz = tsc_khz;
list_for_each_entry(kvm, &vm_list, vm_list) {
__kvm_start_pvclock_update(kvm);
@@ -9026,7 +9013,7 @@ int kvm_arch_init(void *opaque)
if (boot_cpu_has(X86_FEATURE_XSAVE)) {
host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
- supported_xcr0 = host_xcr0 & KVM_SUPPORTED_XCR0;
+ kvm_caps.supported_xcr0 = host_xcr0 & KVM_SUPPORTED_XCR0;
}
if (pi_inject_timer == -1)
@@ -11722,13 +11709,13 @@ int kvm_arch_hardware_setup(void *opaque)
kvm_register_perf_callbacks(ops->handle_intel_pt_intr);
if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES))
- supported_xss = 0;
+ kvm_caps.supported_xss = 0;
#define __kvm_cpu_cap_has(UNUSED_, f) kvm_cpu_cap_has(f)
cr4_reserved_bits = __cr4_reserved_bits(__kvm_cpu_cap_has, UNUSED_);
#undef __kvm_cpu_cap_has
- if (kvm_has_tsc_control) {
+ if (kvm_caps.has_tsc_control) {
/*
* Make sure the user can only configure tsc_khz values that
* fit into a signed integer.
@@ -11736,10 +11723,10 @@ int kvm_arch_hardware_setup(void *opaque)
* be 1 on all machines.
*/
u64 max = min(0x7fffffffULL,
- __scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz));
- kvm_max_guest_tsc_khz = max;
+ __scale_tsc(kvm_caps.max_tsc_scaling_ratio, tsc_khz));
+ kvm_caps.max_guest_tsc_khz = max;
}
- kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits;
+ kvm_caps.default_tsc_scaling_ratio = 1ULL << kvm_caps.tsc_scaling_ratio_frac_bits;
kvm_init_msr_list();
return 0;
}
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 588792f00334..359d0454ad28 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -8,6 +8,25 @@
#include "kvm_cache_regs.h"
#include "kvm_emulate.h"
+struct kvm_caps {
+ /* control of guest tsc rate supported? */
+ bool has_tsc_control;
+ /* maximum supported tsc_khz for guests */
+ u32 max_guest_tsc_khz;
+ /* number of bits of the fractional part of the TSC scaling ratio */
+ u8 tsc_scaling_ratio_frac_bits;
+ /* maximum allowed value of TSC scaling ratio */
+ u64 max_tsc_scaling_ratio;
+ /* 1ull << kvm_caps.tsc_scaling_ratio_frac_bits */
+ u64 default_tsc_scaling_ratio;
+ /* bus lock detection supported? */
+ bool has_bus_lock_exit;
+
+ u64 supported_mce_cap;
+ u64 supported_xcr0;
+ u64 supported_xss;
+};
+
void kvm_spurious_fault(void);
#define KVM_NESTED_VMENTER_CONSISTENCY_CHECK(consistency_check) \
@@ -283,14 +302,15 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
fastpath_t handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu);
extern u64 host_xcr0;
-extern u64 supported_xcr0;
extern u64 host_xss;
-extern u64 supported_xss;
+
+extern struct kvm_caps kvm_caps;
+
extern bool enable_pmu;
static inline bool kvm_mpx_supported(void)
{
- return (supported_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR))
+ return (kvm_caps.supported_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR))
== (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
}
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v7 4/4] KVM: VMX: Enable Notify VM exit
2022-05-24 13:56 [PATCH v7 0/4] Introduce Notify VM exit Chenyi Qiang
` (2 preceding siblings ...)
2022-05-24 13:56 ` [PATCH v7 3/4] KVM: x86: Introduce "struct kvm_caps" to track misc caps/settings Chenyi Qiang
@ 2022-05-24 13:56 ` Chenyi Qiang
3 siblings, 0 replies; 5+ messages in thread
From: Chenyi Qiang @ 2022-05-24 13:56 UTC (permalink / raw)
To: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
Jim Mattson, Joerg Roedel, Xiaoyao Li
Cc: kvm, linux-kernel, Chenyi Qiang
From: Tao Xu <tao3.xu@intel.com>
There are cases that malicious virtual machines can cause CPU stuck (due
to event windows don't open up), e.g., infinite loop in microcode when
nested #AC (CVE-2015-5307). No event window means no event (NMI, SMI and
IRQ) can be delivered. It leads the CPU to be unavailable to host or
other VMs.
VMM can enable notify VM exit that a VM exit generated if no event
window occurs in VM non-root mode for a specified amount of time (notify
window).
Feature enabling:
- The new vmcs field SECONDARY_EXEC_NOTIFY_VM_EXITING is introduced to
enable this feature. VMM can set NOTIFY_WINDOW vmcs field to adjust
the expected notify window.
- Add a new KVM capability KVM_CAP_X86_NOTIFY_VMEXIT so that user space
can query and enable this feature in per-VM scope. The argument is a
64bit value: bits 63:32 are used for notify window, and bits 31:0 are
for flags. Current supported flags:
- KVM_X86_NOTIFY_VMEXIT_ENABLED: enable the feature with the notify
window provided.
- KVM_X86_NOTIFY_VMEXIT_USER: exit to userspace once the exits happen.
- It's safe to even set notify window to zero since an internal hardware
threshold is added to vmcs.notify_window.
VM exit handling:
- Introduce a vcpu state notify_window_exits to records the count of
notify VM exits and expose it through the debugfs.
- Notify VM exit can happen incident to delivery of a vector event.
Allow it in KVM.
- Exit to userspace unconditionally for handling when VM_CONTEXT_INVALID
bit is set.
Nested handling
- Nested notify VM exits are not supported yet. Keep the same notify
window control in vmcs02 as vmcs01, so that L1 can't escape the
restriction of notify VM exits through launching L2 VM.
Notify VM exit is defined in latest Intel Architecture Instruction Set
Extensions Programming Reference, chapter 9.2.
Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Tao Xu <tao3.xu@intel.com>
Co-developed-by: Chenyi Qiang <chenyi.qiang@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
Documentation/virt/kvm/api.rst | 49 ++++++++++++++++++++++++++++++
arch/x86/include/asm/kvm_host.h | 7 +++++
arch/x86/include/asm/vmx.h | 7 +++++
arch/x86/include/asm/vmxfeatures.h | 1 +
arch/x86/include/uapi/asm/vmx.h | 4 ++-
arch/x86/kvm/vmx/capabilities.h | 6 ++++
arch/x86/kvm/vmx/nested.c | 8 +++++
arch/x86/kvm/vmx/vmx.c | 40 ++++++++++++++++++++++--
arch/x86/kvm/x86.c | 22 +++++++++++++-
arch/x86/kvm/x86.h | 7 +++++
include/uapi/linux/kvm.h | 10 ++++++
11 files changed, 157 insertions(+), 4 deletions(-)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index d219523bdb70..1831ee0f7e96 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6325,6 +6325,26 @@ array field represents return values. The userspace should update the return
values of SBI call before resuming the VCPU. For more details on RISC-V SBI
spec refer, https://github.com/riscv/riscv-sbi-doc.
+::
+
+ /* KVM_EXIT_NOTIFY */
+ struct {
+ #define KVM_NOTIFY_CONTEXT_INVALID (1 << 0)
+ __u32 flags;
+ } notify;
+
+Used on x86 systems. When the VM capability KVM_CAP_X86_NOTIFY_VMEXIT is
+enabled, a VM exit generated if no event window occurs in VM non-root mode
+for a specified amount of time. Once KVM_X86_NOTIFY_VMEXIT_USER is set when
+enabling the cap, it would exit to userspace with the exit reason
+KVM_EXIT_NOTIFY for further handling. The "flags" field contains more
+detailed info.
+
+The valid value for 'flags' is:
+
+ - KVM_NOTIFY_CONTEXT_INVALID -- the VM context is corrupted and not valid
+ in VMCS. It would run into unknown result if resume the target VM.
+
::
/* Fix the size of the union. */
@@ -7291,6 +7311,35 @@ if the value was set to zero or KVM_ENABLE_CAP was not invoked, KVM
uses the return value of KVM_CHECK_EXTENSION(KVM_CAP_MAX_VCPU_ID) as
the maximum APIC ID.
+7.33 KVM_CAP_X86_NOTIFY_VMEXIT
+------------------------------
+
+:Architectures: x86
+:Target: VM
+:Parameters: args[0] is the value of notify window as well as some flags
+:Returns: 0 on success, -EINVAL if args[0] contains invalid flags or notify
+ VM exit is unsupported.
+
+Bits 63:32 of args[0] are used for notify window.
+Bits 31:0 of args[0] are for some flags. Valid bits are::
+
+ #define KVM_X86_NOTIFY_VMEXIT_ENABLED (1 << 0)
+ #define KVM_X86_NOTIFY_VMEXIT_USER (1 << 1)
+
+This capability allows userspace to configure the notify VM exit on/off
+in per-VM scope during VM creation. Notify VM exit is disabled by default.
+When userspace sets KVM_X86_NOTIFY_VMEXIT_ENABLED bit in args[0], VMM will
+enable this feature with the notify window provided, which will generate
+a VM exit if no event window occurs in VM non-root mode for a specified of
+time (notify window).
+
+If KVM_X86_NOTIFY_VMEXIT_USER is set in args[0], upon notify VM exits happen,
+KVM would exit to userspace for handling.
+
+This capability is aimed to mitigate the threat that malicious VMs can
+cause CPU stuck (due to event windows don't open up) and make the CPU
+unavailable to host or other VMs.
+
8. Other capabilities.
======================
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 270460e9f3b1..d4c0ea35efa3 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -65,6 +65,9 @@
#define KVM_BUS_LOCK_DETECTION_VALID_MODE (KVM_BUS_LOCK_DETECTION_OFF | \
KVM_BUS_LOCK_DETECTION_EXIT)
+#define KVM_X86_NOTIFY_VMEXIT_VALID_BITS (KVM_X86_NOTIFY_VMEXIT_ENABLED | \
+ KVM_X86_NOTIFY_VMEXIT_USER)
+
/* x86-specific vcpu->requests bit members */
#define KVM_REQ_MIGRATE_TIMER KVM_ARCH_REQ(0)
#define KVM_REQ_REPORT_TPR_ACCESS KVM_ARCH_REQ(1)
@@ -1178,6 +1181,9 @@ struct kvm_arch {
bool bus_lock_detection_enabled;
bool enable_pmu;
+
+ u32 notify_window;
+ u32 notify_vmexit_flags;
/*
* If exit_on_emulation_error is set, and the in-kernel instruction
* emulator fails to emulate an instruction, allow userspace
@@ -1325,6 +1331,7 @@ struct kvm_vcpu_stat {
u64 directed_yield_attempted;
u64 directed_yield_successful;
u64 guest_mode;
+ u64 notify_window_exits;
};
struct x86_instruction_info;
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 89d2172787c5..c371ef695fcc 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -75,6 +75,7 @@
#define SECONDARY_EXEC_TSC_SCALING VMCS_CONTROL_BIT(TSC_SCALING)
#define SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE VMCS_CONTROL_BIT(USR_WAIT_PAUSE)
#define SECONDARY_EXEC_BUS_LOCK_DETECTION VMCS_CONTROL_BIT(BUS_LOCK_DETECTION)
+#define SECONDARY_EXEC_NOTIFY_VM_EXITING VMCS_CONTROL_BIT(NOTIFY_VM_EXITING)
/*
* Definitions of Tertiary Processor-Based VM-Execution Controls.
@@ -280,6 +281,7 @@ enum vmcs_field {
SECONDARY_VM_EXEC_CONTROL = 0x0000401e,
PLE_GAP = 0x00004020,
PLE_WINDOW = 0x00004022,
+ NOTIFY_WINDOW = 0x00004024,
VM_INSTRUCTION_ERROR = 0x00004400,
VM_EXIT_REASON = 0x00004402,
VM_EXIT_INTR_INFO = 0x00004404,
@@ -564,6 +566,11 @@ enum vm_entry_failure_code {
#define EPT_VIOLATION_GVA_IS_VALID (1 << EPT_VIOLATION_GVA_IS_VALID_BIT)
#define EPT_VIOLATION_GVA_TRANSLATED (1 << EPT_VIOLATION_GVA_TRANSLATED_BIT)
+/*
+ * Exit Qualifications for NOTIFY VM EXIT
+ */
+#define NOTIFY_VM_CONTEXT_INVALID BIT(0)
+
/*
* VM-instruction error numbers
*/
diff --git a/arch/x86/include/asm/vmxfeatures.h b/arch/x86/include/asm/vmxfeatures.h
index 589608c157bf..c6a7eed03914 100644
--- a/arch/x86/include/asm/vmxfeatures.h
+++ b/arch/x86/include/asm/vmxfeatures.h
@@ -85,6 +85,7 @@
#define VMX_FEATURE_USR_WAIT_PAUSE ( 2*32+ 26) /* Enable TPAUSE, UMONITOR, UMWAIT in guest */
#define VMX_FEATURE_ENCLV_EXITING ( 2*32+ 28) /* "" VM-Exit on ENCLV (leaf dependent) */
#define VMX_FEATURE_BUS_LOCK_DETECTION ( 2*32+ 30) /* "" VM-Exit when bus lock caused */
+#define VMX_FEATURE_NOTIFY_VM_EXITING ( 2*32+ 31) /* VM-Exit when no event windows after notify window */
/* Tertiary Processor-Based VM-Execution Controls, word 3 */
#define VMX_FEATURE_IPI_VIRT ( 3*32+ 4) /* Enable IPI virtualization */
diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
index 946d761adbd3..a5faf6d88f1b 100644
--- a/arch/x86/include/uapi/asm/vmx.h
+++ b/arch/x86/include/uapi/asm/vmx.h
@@ -91,6 +91,7 @@
#define EXIT_REASON_UMWAIT 67
#define EXIT_REASON_TPAUSE 68
#define EXIT_REASON_BUS_LOCK 74
+#define EXIT_REASON_NOTIFY 75
#define VMX_EXIT_REASONS \
{ EXIT_REASON_EXCEPTION_NMI, "EXCEPTION_NMI" }, \
@@ -153,7 +154,8 @@
{ EXIT_REASON_XRSTORS, "XRSTORS" }, \
{ EXIT_REASON_UMWAIT, "UMWAIT" }, \
{ EXIT_REASON_TPAUSE, "TPAUSE" }, \
- { EXIT_REASON_BUS_LOCK, "BUS_LOCK" }
+ { EXIT_REASON_BUS_LOCK, "BUS_LOCK" }, \
+ { EXIT_REASON_NOTIFY, "NOTIFY" }
#define VMX_EXIT_REASON_FLAGS \
{ VMX_EXIT_REASONS_FAILED_VMENTRY, "FAILED_VMENTRY" }
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index f14c4bef97e0..2d3f13b18714 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -436,4 +436,10 @@ static inline u64 vmx_supported_debugctl(void)
return debugctl;
}
+static inline bool cpu_has_notify_vmexit(void)
+{
+ return vmcs_config.cpu_based_2nd_exec_ctrl &
+ SECONDARY_EXEC_NOTIFY_VM_EXITING;
+}
+
#endif /* __KVM_X86_VMX_CAPS_H */
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index aab4745eb1ee..8086db2ad73c 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2133,6 +2133,8 @@ static u64 nested_vmx_calc_efer(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx)
{
+ struct kvm *kvm = vmx->vcpu.kvm;
+
/*
* If vmcs02 hasn't been initialized, set the constant vmcs02 state
* according to L0's settings (vmcs12 is irrelevant here). Host
@@ -2175,6 +2177,9 @@ static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx)
if (cpu_has_vmx_encls_vmexit())
vmcs_write64(ENCLS_EXITING_BITMAP, INVALID_GPA);
+ if (kvm_notify_vmexit_enabled(kvm))
+ vmcs_write32(NOTIFY_WINDOW, kvm->arch.notify_window);
+
/*
* Set the MSR load/store lists to match L0's settings. Only the
* addresses are constant (for vmcs02), the counts can change based
@@ -6107,6 +6112,9 @@ static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu,
SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE);
case EXIT_REASON_ENCLS:
return nested_vmx_exit_handled_encls(vcpu, vmcs12);
+ case EXIT_REASON_NOTIFY:
+ /* Notify VM exit is not exposed to L1 */
+ return false;
default:
return true;
}
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b06eafa5884d..a86546921c2b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2497,7 +2497,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
SECONDARY_EXEC_PT_USE_GPA |
SECONDARY_EXEC_PT_CONCEAL_VMX |
SECONDARY_EXEC_ENABLE_VMFUNC |
- SECONDARY_EXEC_BUS_LOCK_DETECTION;
+ SECONDARY_EXEC_BUS_LOCK_DETECTION |
+ SECONDARY_EXEC_NOTIFY_VM_EXITING;
if (cpu_has_sgx())
opt2 |= SECONDARY_EXEC_ENCLS_EXITING;
if (adjust_vmx_controls(min2, opt2,
@@ -4410,6 +4411,9 @@ static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
if (!vcpu->kvm->arch.bus_lock_detection_enabled)
exec_control &= ~SECONDARY_EXEC_BUS_LOCK_DETECTION;
+ if (!kvm_notify_vmexit_enabled(vcpu->kvm))
+ exec_control &= ~SECONDARY_EXEC_NOTIFY_VM_EXITING;
+
return exec_control;
}
@@ -4491,6 +4495,9 @@ static void init_vmcs(struct vcpu_vmx *vmx)
vmx->ple_window_dirty = true;
}
+ if (kvm_notify_vmexit_enabled(kvm))
+ vmcs_write32(NOTIFY_WINDOW, kvm->arch.notify_window);
+
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
@@ -5777,6 +5784,32 @@ static int handle_bus_lock_vmexit(struct kvm_vcpu *vcpu)
return 1;
}
+static int handle_notify(struct kvm_vcpu *vcpu)
+{
+ unsigned long exit_qual = vmx_get_exit_qual(vcpu);
+ bool context_invalid = exit_qual & NOTIFY_VM_CONTEXT_INVALID;
+
+ ++vcpu->stat.notify_window_exits;
+
+ /*
+ * Notify VM exit happened while executing iret from NMI,
+ * "blocked by NMI" bit has to be set before next VM entry.
+ */
+ if (enable_vnmi && (exit_qual & INTR_INFO_UNBLOCK_NMI))
+ vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
+ GUEST_INTR_STATE_NMI);
+
+ if (vcpu->kvm->arch.notify_vmexit_flags & KVM_X86_NOTIFY_VMEXIT_USER ||
+ context_invalid) {
+ vcpu->run->exit_reason = KVM_EXIT_NOTIFY;
+ vcpu->run->notify.flags = context_invalid ?
+ KVM_NOTIFY_CONTEXT_INVALID : 0;
+ return 0;
+ }
+
+ return 1;
+}
+
/*
* The exit handlers return 1 if the exit was handled fully and guest execution
* may resume. Otherwise they set the kvm_run parameter to indicate what needs
@@ -5834,6 +5867,7 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_PREEMPTION_TIMER] = handle_preemption_timer,
[EXIT_REASON_ENCLS] = handle_encls,
[EXIT_REASON_BUS_LOCK] = handle_bus_lock_vmexit,
+ [EXIT_REASON_NOTIFY] = handle_notify,
};
static const int kvm_vmx_max_exit_handlers =
@@ -6207,7 +6241,8 @@ static int __vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
exit_reason.basic != EXIT_REASON_EPT_VIOLATION &&
exit_reason.basic != EXIT_REASON_PML_FULL &&
exit_reason.basic != EXIT_REASON_APIC_ACCESS &&
- exit_reason.basic != EXIT_REASON_TASK_SWITCH)) {
+ exit_reason.basic != EXIT_REASON_TASK_SWITCH &&
+ exit_reason.basic != EXIT_REASON_NOTIFY)) {
int ndata = 3;
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
@@ -8130,6 +8165,7 @@ static __init int hardware_setup(void)
kvm_caps.max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX;
kvm_caps.tsc_scaling_ratio_frac_bits = 48;
kvm_caps.has_bus_lock_exit = cpu_has_vmx_bus_lock_detection();
+ kvm_caps.has_notify_vmexit = cpu_has_notify_vmexit();
set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d745d87835e2..9fb20e05a643 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -284,7 +284,8 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, nested_run),
STATS_DESC_COUNTER(VCPU, directed_yield_attempted),
STATS_DESC_COUNTER(VCPU, directed_yield_successful),
- STATS_DESC_ICOUNTER(VCPU, guest_mode)
+ STATS_DESC_ICOUNTER(VCPU, guest_mode),
+ STATS_DESC_COUNTER(VCPU, notify_window_exits),
};
const struct kvm_stats_header kvm_vcpu_stats_header = {
@@ -4399,6 +4400,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_DISABLE_QUIRKS2:
r = KVM_X86_VALID_QUIRKS;
break;
+ case KVM_CAP_X86_NOTIFY_VMEXIT:
+ r = kvm_caps.has_notify_vmexit;
+ break;
default:
break;
}
@@ -6122,6 +6126,22 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
}
mutex_unlock(&kvm->lock);
break;
+ case KVM_CAP_X86_NOTIFY_VMEXIT:
+ r = -EINVAL;
+ if ((u32)cap->args[0] & ~KVM_X86_NOTIFY_VMEXIT_VALID_BITS)
+ break;
+ if (!kvm_caps.has_notify_vmexit)
+ break;
+ if (!((u32)cap->args[0] & KVM_X86_NOTIFY_VMEXIT_ENABLED))
+ break;
+ mutex_lock(&kvm->lock);
+ if (!kvm->created_vcpus) {
+ kvm->arch.notify_window = cap->args[0] >> 32;
+ kvm->arch.notify_vmexit_flags = (u32)cap->args[0];
+ r = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ break;
default:
r = -EINVAL;
break;
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 359d0454ad28..501b884b8cc4 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -21,6 +21,8 @@ struct kvm_caps {
u64 default_tsc_scaling_ratio;
/* bus lock detection supported? */
bool has_bus_lock_exit;
+ /* notify VM exit supported? */
+ bool has_notify_vmexit;
u64 supported_mce_cap;
u64 supported_xcr0;
@@ -364,6 +366,11 @@ static inline bool kvm_cstate_in_guest(struct kvm *kvm)
return kvm->arch.cstate_in_guest;
}
+static inline bool kvm_notify_vmexit_enabled(struct kvm *kvm)
+{
+ return kvm->arch.notify_vmexit_flags & KVM_X86_NOTIFY_VMEXIT_ENABLED;
+}
+
enum kvm_intr_type {
/* Values are arbitrary, but must be non-zero. */
KVM_HANDLING_IRQ = 1,
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index ec75b56229c7..e028d5246920 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -270,6 +270,7 @@ struct kvm_xen_exit {
#define KVM_EXIT_X86_BUS_LOCK 33
#define KVM_EXIT_XEN 34
#define KVM_EXIT_RISCV_SBI 35
+#define KVM_EXIT_NOTIFY 36
/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@@ -494,6 +495,11 @@ struct kvm_run {
unsigned long args[6];
unsigned long ret[2];
} riscv_sbi;
+ /* KVM_EXIT_NOTIFY */
+ struct {
+#define KVM_NOTIFY_CONTEXT_INVALID (1 << 0)
+ __u32 flags;
+ } notify;
/* Fix the size of the union. */
char padding[256];
};
@@ -1154,6 +1160,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_VM_TSC_CONTROL 214
#define KVM_CAP_SYSTEM_EVENT_DATA 215
#define KVM_CAP_TRIPLE_FAULT_EVENT 216
+#define KVM_CAP_X86_NOTIFY_VMEXIT 217
#ifdef KVM_CAP_IRQ_ROUTING
@@ -2115,4 +2122,7 @@ struct kvm_stats_desc {
/* Available with KVM_CAP_XSAVE2 */
#define KVM_GET_XSAVE2 _IOR(KVMIO, 0xcf, struct kvm_xsave)
+#define KVM_X86_NOTIFY_VMEXIT_ENABLED (1ULL << 0)
+#define KVM_X86_NOTIFY_VMEXIT_USER (1ULL << 1)
+
#endif /* __LINUX_KVM_H */
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread