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 should be applied on top of KVM patches from the patch series "[PATCH v2 0/9] perf support for x86 guest/host-only bits" [1] 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 [2][3] to the host kernel first. Don't tell me I didn't warn you! [1] https://lkml.org/lkml/2011/10/5/153 [2] https://lkml.org/lkml/2011/10/18/390 [3] https://lkml.org/lkml/2011/10/23/163 Avi Kivity (8): KVM: Expose kvm_lapic_local_deliver() KVM: Expose a version 2 architectural PMU to a guests KVM: Add generic RDPMC support KVM: SVM: Intercept RDPMC KVM: VMX: Intercept RDPMC KVM: Expose the architectural performance monitoring CPUID leaf KVM: x86 emulator: fix RDPMC privilege check KVM: x86 emulator: implement RDPMC (0F 33) Gleb Natapov (1): perf: expose perf capability to other modules. arch/x86/include/asm/kvm_emulate.h | 1 + arch/x86/include/asm/kvm_host.h | 44 +++ arch/x86/include/asm/perf_event.h | 11 + arch/x86/kernel/cpu/perf_event.c | 11 + arch/x86/kernel/cpu/perf_event.h | 2 + arch/x86/kernel/cpu/perf_event_intel.c | 3 + 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 | 513 ++++++++++++++++++++++++++++++++ arch/x86/kvm/svm.c | 15 + arch/x86/kvm/vmx.c | 15 +- arch/x86/kvm/x86.c | 65 ++++- include/linux/kvm_host.h | 1 + 15 files changed, 686 insertions(+), 13 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; //0x07280402; + *ebx = 0; + *ecx = 0; + *edx = 0; //0x00000503; + } break; case 0xD: /* Processor Extended State */ -- 1.7.5.3 -- 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
