Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH 06/31] perf, kvm: Support the intx/intx_cp modifiers in KVM arch perfmon emulation | Date | Tue, 2 Oct 2012 16:48:26 -0700 |
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From: Andi Kleen <ak@linux.intel.com>
This is not arch perfmon, but older CPUs will just ignore it. This makes it possible to do at least some TSX measurements from a KVM guest
Cc: avi@redhat.com Signed-off-by: Andi Kleen <ak@linux.intel.com> --- arch/x86/kvm/pmu.c | 13 ++++++++++--- 1 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 9b7ec11..f72a409 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -160,7 +160,7 @@ static void stop_counter(struct kvm_pmc *pmc) static void reprogram_counter(struct kvm_pmc *pmc, u32 type, unsigned config, bool exclude_user, bool exclude_kernel, - bool intr) + bool intr, bool intx, bool intx_cp) { struct perf_event *event; struct perf_event_attr attr = { @@ -173,6 +173,11 @@ static void reprogram_counter(struct kvm_pmc *pmc, u32 type, .exclude_kernel = exclude_kernel, .config = config, }; + /* Will be ignored on CPUs that don't support this. */ + if (intx) + attr.config |= HSW_INTX; + if (intx_cp) + attr.config |= HSW_INTX_CHECKPOINTED; attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc); @@ -239,7 +244,9 @@ static void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel) reprogram_counter(pmc, type, config, !(eventsel & ARCH_PERFMON_EVENTSEL_USR), !(eventsel & ARCH_PERFMON_EVENTSEL_OS), - eventsel & ARCH_PERFMON_EVENTSEL_INT); + eventsel & ARCH_PERFMON_EVENTSEL_INT, + !!(eventsel & HSW_INTX), + !!(eventsel & HSW_INTX_CHECKPOINTED)); } static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 en_pmi, int idx) @@ -256,7 +263,7 @@ static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 en_pmi, int idx) arch_events[fixed_pmc_events[idx]].event_type, !(en & 0x2), /* exclude user */ !(en & 0x1), /* exclude kernel */ - pmi); + pmi, false, false); } static inline u8 fixed_en_pmi(u64 ctrl, int idx) -- 1.7.7.6
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