The Processor Event-Based Sampling(PEBS) supported on mainstream Intel platforms can provide an architectural state of the instruction executed after the instruction that caused the event. This patchset is going to enable PEBS feature via DS on KVM for the Icelake server. Although PEBS via DS supports EPT violations feature is supported starting Skylake Server, but we have to pin DS area to avoid losing PEBS records due to some issues. BTW: The PEBS virtualization via Intel PT patchset V1 has been posted out and the later version will base on this patchset. https://lkml.kernel.org/r/1572217877-26484-1-git-send-email-luwei.kang@xxxxxxxxx/ Testing: The guest can use PEBS feature like native. e.g. # perf record -e instructions:ppp ./br_instr a perf report on guest: # Samples: 2K of event 'instructions:ppp', # Event count (approx.): 1473377250 # Overhead Command Shared Object Symbol 57.74% br_instr br_instr [.] lfsr_cond 41.40% br_instr br_instr [.] cmp_end 0.21% br_instr [kernel.kallsyms] [k] __lock_acquire perf report on host: # Samples: 2K of event 'instructions:ppp', # Event count (approx.): 1462721386 # Overhead Command Shared Object Symbol 57.90% br_instr br_instr [.] lfsr_cond 41.95% br_instr br_instr [.] cmp_end 0.05% br_instr [kernel.vmlinux] [k] lock_acquire Kan Liang (4): perf/x86/core: Support KVM to assign a dedicated counter for guest PEBS perf/x86/ds: Handle guest PEBS events overflow and inject fake PMI perf/x86: Expose a function to disable auto-reload KVM: x86/pmu: Decouple event enablement from event creation Like Xu (1): KVM: x86/pmu: Add support to reprogram PEBS event for guest counters Luwei Kang (6): KVM: x86/pmu: Implement is_pebs_via_ds_supported pmu ops KVM: x86/pmu: Expose CPUIDs feature bits PDCM, DS, DTES64 KVM: x86/pmu: PEBS MSRs emulation KVM: x86/pmu: Expose PEBS feature to guest KVM: x86/pmu: Introduce the mask value for fixed counter KVM: x86/pmu: Adaptive PEBS virtualization enabling arch/x86/events/intel/core.c | 74 +++++++++++++++++++++- arch/x86/events/intel/ds.c | 59 ++++++++++++++++++ arch/x86/events/perf_event.h | 1 + arch/x86/include/asm/kvm_host.h | 12 ++++ arch/x86/include/asm/msr-index.h | 4 ++ arch/x86/include/asm/perf_event.h | 2 + arch/x86/kvm/cpuid.c | 9 ++- arch/x86/kvm/pmu.c | 71 ++++++++++++++++++++- arch/x86/kvm/pmu.h | 2 + arch/x86/kvm/svm.c | 12 ++++ arch/x86/kvm/vmx/capabilities.h | 17 +++++ arch/x86/kvm/vmx/pmu_intel.c | 128 +++++++++++++++++++++++++++++++++++++- arch/x86/kvm/vmx/vmx.c | 6 +- arch/x86/kvm/vmx/vmx.h | 4 ++ arch/x86/kvm/x86.c | 19 +++++- include/linux/perf_event.h | 2 + kernel/events/core.c | 1 + 17 files changed, 414 insertions(+), 9 deletions(-) -- 1.8.3.1
