[PATCH 06/34] perf, kvm: Support the intx/intx_cp modifiers in KVM arch perfmon emulation v2

Andi Kleen
2012-10-18T23:20:09Z

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
v2: Various fixes to address review feedback
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
arch/x86/kvm/pmu.c | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index cfc258a..81c1632 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)
@@ -400,7 +407,7 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data)
} else if ((pmc = get_gp_pmc(pmu, index, MSR_P6_EVNTSEL0))) {
if (data == pmc->eventsel)
return 0;
- if (!(data & 0xffffffff00200000ull)) {
+ if (!(data & 0xfffffffc00200000ull)) {
reprogram_gp_counter(pmc, data);
return 0;
}
--
1.7.7.6