Good well-designed tests can help us find more bugs, especially when the test steps differ from the Linux kernel behaviour in terms of the timing of access to virtualized hw resources. In this patch series, there are three small optimization (006/007/008), one hardware surprise (001), and most of these fixes have stepped on my little toes. Please feel free to run tests, add more or share comments. Previous: https://lore.kernel.org/kvm/20220721103549.49543-1-likexu@xxxxxxxxxxx/ https://lore.kernel.org/kvm/20220803130124.72340-1-likexu@xxxxxxxxxxx/ V2 -> V2 RESEND Changelog: - The "pebs_capable" fix has been merged into tip/perf/tree tree; - Move the other two AMD vPMU optimization here; Like Xu (8): perf/x86/core: Completely disable guest PEBS via guest's global_ctrl KVM: x86/pmu: Avoid setting BIT_ULL(-1) to pmu->host_cross_mapped_mask KVM: x86/pmu: Don't generate PEBS records for emulated instructions KVM: x86/pmu: Avoid using PEBS perf_events for normal counters KVM: x86/pmu: Defer reprogram_counter() to kvm_pmu_handle_event() KVM: x86/pmu: Defer counter emulated overflow via pmc->stale_counter KVM: x86/svm/pmu: Direct access pmu->gp_counter[] to implement amd_*_to_pmc() KVM: x86/svm/pmu: Rewrite get_gp_pmc_amd() for more counters scalability arch/x86/events/intel/core.c | 3 +- arch/x86/include/asm/kvm_host.h | 6 +- arch/x86/kvm/pmu.c | 47 ++++++++----- arch/x86/kvm/pmu.h | 6 +- arch/x86/kvm/svm/pmu.c | 116 +++++--------------------------- arch/x86/kvm/vmx/pmu_intel.c | 30 ++++----- 6 files changed, 73 insertions(+), 135 deletions(-) -- 2.37.2
