This patchset exposes an emulated version 2 architectural performance
monitoring unit to KVM guests. The PMU is emulated using perf_events,
so the host kernel can multiplex host-wide, host-user, and the
guest on available resources.
The patches are against next branch on kvm.git.
If you want to try running perf in a guest you need to apply the patch
below to qemu-kvm and use -cpu host on qemu command line. But DO NOT
TRY those patches without applying [1][2] to the host kernel first.
Don't tell me I didn't warn you!
[1] https://lkml.org/lkml/2011/10/18/390
[2] https://lkml.org/lkml/2011/10/23/163
Changelog:
v1-v2
- put index into struct kvm_pmc instead of calculating it
- use locked version of bitops
- inject pmi from irq work if vcpu was not in a guest mode during NMI
- providing stub for perf_get_x86_pmu_capability() for !PERF_EVENTS
v2-v3
- minor style change/comment clarification
- add perf patch to disable arch event not supported by a CPU
- create perf events as pinned
Avi Kivity (6):
KVM: Expose kvm_lapic_local_deliver()
KVM: Add generic RDPMC support
KVM: SVM: Intercept RDPMC
KVM: VMX: Intercept RDPMC
KVM: x86 emulator: fix RDPMC privilege check
KVM: x86 emulator: implement RDPMC (0F 33)
Gleb Natapov (4):
KVM: Expose a version 2 architectural PMU to a guests
x86, perf: disable non available architectural events.
perf, x86: expose perf capability to other modules.
KVM: Expose the architectural performance monitoring CPUID leaf
arch/x86/include/asm/kvm_emulate.h |1 +
arch/x86/include/asm/kvm_host.h| 49 +++
arch/x86/include/asm/perf_event.h | 29 ++
arch/x86/kernel/cpu/perf_event.c | 11 +
arch/x86/kernel/cpu/perf_event.h |5 +
arch/x86/kernel/cpu/perf_event_intel.c | 29 ++-
arch/x86/kvm/Kconfig |1 +
arch/x86/kvm/Makefile |2 +-
arch/x86/kvm/emulate.c | 13 +-
arch/x86/kvm/lapic.c |2 +-
arch/x86/kvm/lapic.h |1 +
arch/x86/kvm/pmu.c | 531
arch/x86/kvm/svm.c | 15 +
arch/x86/kvm/vmx.c | 15 +-
arch/x86/kvm/x86.c | 76 -
include/linux/kvm_host.h |2 +
16 files changed, 763 insertions(+), 19 deletions(-)
create mode 100644 arch/x86/kvm/pmu.c
diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index f17..ff2a0ca 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -1178,11 +1178,20 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
uint32_t count,
*edx = 0;
break;
case 0xA:
-/* Architectural Performance Monitoring Leaf */
-*eax = 0;
-*ebx = 0;
-*ecx = 0;
-*edx = 0;
+ if (kvm_enabled()) {
+KVMState *s = env-kvm_state;
+
+*eax = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EAX);
+*ebx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EBX);
+*ecx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_ECX);
+*edx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EDX);
+ } else {
+ /* Architectural Performance Monitoring Leaf */
+ *eax = 0;
+ *ebx = 0;
+ *ecx = 0;
+ *edx = 0;
+ }
break;
case 0xD:
/* Processor Extended State */
--
1.7.7.1
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