This not-for-merging patchset exposes an emulated version 1 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. Caveats: - counters that have PMI (interrupt) enabled stop counting after the interrupt is signalled. This is because we need one-shot samples that keep counting, which perf doesn't support yet - some combinations of INV and CMASK are not supported - counters keep on counting in the host as well as the guest - the RDPMC instruction and CR4.PCE bit are not yet emulated - there is likely a bug in the implementation; running 'perf top' in a guest that spends 80% of its time in userspace shows perf itself as consuming almost all cpu perf maintainers: please consider the first three patches for merging (the first two make sense even without the rest). If you're familiar with the Intel PMU, please review patch 5 as well - it effectively undoes all your work of abstracting the PMU into perf_events by unabstracting perf_events into what is hoped is a very similar PMU. Avi Kivity (5): perf: add context parameter to perf_event overflow handler x86, perf: add constraints for architectural PMU v1 perf: export perf_event_refresh() to modules KVM: Expose kvm_lapic_local_deliver() KVM: Expose a version 1 architectural PMU to guests arch/arm/kernel/ptrace.c | 10 +- arch/powerpc/kernel/ptrace.c | 4 +- arch/sh/kernel/ptrace_32.c | 5 +- arch/x86/include/asm/kvm_host.h | 29 ++++ arch/x86/kernel/cpu/perf_event_intel.c | 23 +++- arch/x86/kernel/kgdb.c | 2 +- arch/x86/kernel/ptrace.c | 5 +- arch/x86/kvm/Makefile | 2 +- arch/x86/kvm/lapic.c | 2 +- arch/x86/kvm/lapic.h | 1 + arch/x86/kvm/pmu.c | 248 +++++++++++++++++++++++++++++++ arch/x86/kvm/x86.c | 16 +- drivers/oprofile/oprofile_perf.c | 5 +- include/linux/hw_breakpoint.h | 10 +- include/linux/perf_event.h | 13 ++- kernel/events/core.c | 27 +++- kernel/events/hw_breakpoint.c | 10 +- kernel/watchdog.c | 7 +- samples/hw_breakpoint/data_breakpoint.c | 5 +- 19 files changed, 377 insertions(+), 47 deletions(-) create mode 100644 arch/x86/kvm/pmu.c -- 1.7.4.3 -- 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
