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. Changes from v2: - Ensured that exclude_kernel works for guest - Removed unnecessary exclusion of EL2 with exclude_host on !VHE - Renamed kvm_clr_set_host_pmu_events to reflect args order - Added additional information to isb patch Changes from v1: - Removed unnecessary exclusion of EL1 with exclude_guest on VHE - Removed unnecessary isb from existing perf_event.c driver - Folded perf_event.c patches together - Added additional information to last patch commit message Andrew Murray (4): arm64: arm_pmu: remove unnecessary isb instruction arm64: KVM: add accessors to track guest/host only counters arm64: arm_pmu: Add support for exclude_host/exclude_guest 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 | 53 +++++++++++++++++++++++++++++++++------ arch/arm64/kvm/hyp/switch.c | 38 ++++++++++++++++++++++++++++ 3 files changed, 103 insertions(+), 8 deletions(-) -- 2.7.4 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
