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 f179999..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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
