Update a PMC's sample period in pmc_write_counter() to deduplicate code
across all callers of pmc_write_counter(). Opportunistically move
pmc_write_counter() into pmc.c now that it's doing more work. WRMSR isn't
such a hot path that an extra CALL+RET pair will be problematic, and the
order of function definitions needs to be changed anyways, i.e. now is a
convenient time to eat the churn.
Reviewed-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
arch/x86/kvm/pmu.c | 27 +++++++++++++++++++++++++++
arch/x86/kvm/pmu.h | 25 +------------------------
arch/x86/kvm/svm/pmu.c | 1 -
arch/x86/kvm/vmx/pmu_intel.c | 2 --
4 files changed, 28 insertions(+), 27 deletions(-)
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index c06090196b00..3725d001239d 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -161,6 +161,15 @@ static u64 pmc_get_pebs_precise_level(struct kvm_pmc *pmc)
return 1;
}
+static u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value)
+{
+ u64 sample_period = (-counter_value) & pmc_bitmask(pmc);
+
+ if (!sample_period)
+ sample_period = pmc_bitmask(pmc) + 1;
+ return sample_period;
+}
+
static int pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, u64 config,
bool exclude_user, bool exclude_kernel,
bool intr)
@@ -268,6 +277,24 @@ static void pmc_stop_counter(struct kvm_pmc *pmc)
}
}
+static void pmc_update_sample_period(struct kvm_pmc *pmc)
+{
+ if (!pmc->perf_event || pmc->is_paused ||
+ !is_sampling_event(pmc->perf_event))
+ return;
+
+ perf_event_period(pmc->perf_event,
+ get_sample_period(pmc, pmc->counter));
+}
+
+void pmc_write_counter(struct kvm_pmc *pmc, u64 val)
+{
+ pmc->counter += val - pmc_read_counter(pmc);
+ pmc->counter &= pmc_bitmask(pmc);
+ pmc_update_sample_period(pmc);
+}
+EXPORT_SYMBOL_GPL(pmc_write_counter);
+
static int filter_cmp(const void *pa, const void *pb, u64 mask)
{
u64 a = *(u64 *)pa & mask;
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index db9a12c0a2ef..cae85e550f60 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -74,11 +74,7 @@ static inline u64 pmc_read_counter(struct kvm_pmc *pmc)
return counter & pmc_bitmask(pmc);
}
-static inline void pmc_write_counter(struct kvm_pmc *pmc, u64 val)
-{
- pmc->counter += val - pmc_read_counter(pmc);
- pmc->counter &= pmc_bitmask(pmc);
-}
+void pmc_write_counter(struct kvm_pmc *pmc, u64 val);
static inline bool pmc_is_gp(struct kvm_pmc *pmc)
{
@@ -128,25 +124,6 @@ static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr)
return NULL;
}
-static inline u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value)
-{
- u64 sample_period = (-counter_value) & pmc_bitmask(pmc);
-
- if (!sample_period)
- sample_period = pmc_bitmask(pmc) + 1;
- return sample_period;
-}
-
-static inline void pmc_update_sample_period(struct kvm_pmc *pmc)
-{
- if (!pmc->perf_event || pmc->is_paused ||
- !is_sampling_event(pmc->perf_event))
- return;
-
- perf_event_period(pmc->perf_event,
- get_sample_period(pmc, pmc->counter));
-}
-
static inline bool pmc_speculative_in_use(struct kvm_pmc *pmc)
{
struct kvm_pmu *pmu = pmc_to_pmu(pmc);
diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index 3fd47de14b38..b6a7ad4d6914 100644
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -161,7 +161,6 @@ static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
pmc = get_gp_pmc_amd(pmu, msr, PMU_TYPE_COUNTER);
if (pmc) {
pmc_write_counter(pmc, data);
- pmc_update_sample_period(pmc);
return 0;
}
/* MSR_EVNTSELn */
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 90c1f7f07e53..a6216c874729 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -437,11 +437,9 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
!(msr & MSR_PMC_FULL_WIDTH_BIT))
data = (s64)(s32)data;
pmc_write_counter(pmc, data);
- pmc_update_sample_period(pmc);
break;
} else if ((pmc = get_fixed_pmc(pmu, msr))) {
pmc_write_counter(pmc, data);
- pmc_update_sample_period(pmc);
break;
} else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) {
reserved_bits = pmu->reserved_bits;
--
2.42.0.869.gea05f2083d-goog
