This patchset provides support for perf event modifiers :G and :H which allows for filtering of PMU events between host and guests when used with KVM.
As the underlying hardware cannot distinguish between guest and host context, the performance counters must be stopped and started upon entry/exit to the guest. This is performed at EL2 in a way that minimizes overhead and improves accuracy of recording events that only occur in the requested context. This has been tested with VHE and non-VHE kernels with a KVM guest. Andrew Murray (4): arm64: KVM: add accessors to track guest/host only counters arm64: arm_pmu: Add support for exclude_host/exclude_guest attributes arm64: arm_pmu: Exclude EL1,2 with :G :H perf attributes arm64: KVM: Enable support for :G/:H perf event modifiers arch/arm64/include/asm/kvm_host.h | 20 +++++++++++++++++ arch/arm64/kernel/perf_event.c | 45 +++++++++++++++++++++++++++++++++------ arch/arm64/kvm/hyp/switch.c | 38 +++++++++++++++++++++++++++++++++ 3 files changed, 96 insertions(+), 7 deletions(-) -- 2.7.4 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
