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Date: Sun, 27 Oct 2019 19:11:12 -0400
From: Luwei Kang <luwei.kang@...el.com>
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: pbonzini@...hat.com, rkrcmar@...hat.com,
sean.j.christopherson@...el.com, vkuznets@...hat.com,
wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
x86@...nel.org, ak@...ux.intel.com, thomas.lendacky@....com,
peterz@...radead.org, acme@...nel.org, mark.rutland@....com,
alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
namhyung@...nel.org, Luwei Kang <luwei.kang@...el.com>
Subject: [PATCH v1 3/8] KVM: x86: Allocate performance counter for PEBS event
This patch add a new parameter "pebs" that to make the
host PMU framework allocate the performance counter for
guest PEBS event.
Signed-off-by: Luwei Kang <luwei.kang@...el.com>
---
arch/x86/kvm/pmu.c | 23 +++++++++++++++--------
arch/x86/kvm/pmu.h | 5 +++--
arch/x86/kvm/pmu_amd.c | 2 +-
arch/x86/kvm/vmx/pmu_intel.c | 10 +++++-----
4 files changed, 24 insertions(+), 16 deletions(-)
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 46875bb..5088d1c 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -99,7 +99,7 @@ static void kvm_perf_overflow_intr(struct perf_event *perf_event,
static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
unsigned config, bool exclude_user,
bool exclude_kernel, bool intr,
- bool in_tx, bool in_tx_cp)
+ bool in_tx, bool in_tx_cp, bool pebs)
{
struct perf_event *event;
struct perf_event_attr attr = {
@@ -111,9 +111,12 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
.exclude_user = exclude_user,
.exclude_kernel = exclude_kernel,
.config = config,
+ .precise_ip = pebs ? 1 : 0,
+ .aux_output = pebs ? 1 : 0,
};
- attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc);
+ attr.sample_period = pebs ? (-pmc->reload_cnt) & pmc_bitmask(pmc) :
+ (-pmc->counter) & pmc_bitmask(pmc);
if (in_tx)
attr.config |= HSW_IN_TX;
@@ -140,7 +143,7 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
clear_bit(pmc->idx, (unsigned long*)&pmc_to_pmu(pmc)->reprogram_pmi);
}
-void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
+void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel, bool pebs)
{
unsigned config, type = PERF_TYPE_RAW;
u8 event_select, unit_mask;
@@ -198,11 +201,12 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
!(eventsel & ARCH_PERFMON_EVENTSEL_OS),
eventsel & ARCH_PERFMON_EVENTSEL_INT,
(eventsel & HSW_IN_TX),
- (eventsel & HSW_IN_TX_CHECKPOINTED));
+ (eventsel & HSW_IN_TX_CHECKPOINTED),
+ pebs);
}
EXPORT_SYMBOL_GPL(reprogram_gp_counter);
-void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)
+void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx, bool pebs)
{
unsigned en_field = ctrl & 0x3;
bool pmi = ctrl & 0x8;
@@ -228,7 +232,8 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)
kvm_x86_ops->pmu_ops->find_fixed_event(idx),
!(en_field & 0x2), /* exclude user */
!(en_field & 0x1), /* exclude kernel */
- pmi, false, false);
+ pmi, false, false,
+ pebs);
}
EXPORT_SYMBOL_GPL(reprogram_fixed_counter);
@@ -240,12 +245,14 @@ void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx)
return;
if (pmc_is_gp(pmc))
- reprogram_gp_counter(pmc, pmc->eventsel);
+ reprogram_gp_counter(pmc, pmc->eventsel,
+ (pmu->pebs_enable & BIT_ULL(pmc_idx)));
else {
int idx = pmc_idx - INTEL_PMC_IDX_FIXED;
u8 ctrl = fixed_ctrl_field(pmu->fixed_ctr_ctrl, idx);
- reprogram_fixed_counter(pmc, ctrl, idx);
+ reprogram_fixed_counter(pmc, ctrl, idx,
+ (pmu->pebs_enable & BIT_ULL(pmc_idx)));
}
}
EXPORT_SYMBOL_GPL(reprogram_counter);
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index c62a1ff..0c59a15 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -102,8 +102,9 @@ static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr,
return NULL;
}
-void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel);
-void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx);
+void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel, bool pebs);
+void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx,
+ bool pebs);
void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx);
void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/pmu_amd.c b/arch/x86/kvm/pmu_amd.c
index c838838..7b3e307 100644
--- a/arch/x86/kvm/pmu_amd.c
+++ b/arch/x86/kvm/pmu_amd.c
@@ -248,7 +248,7 @@ static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (data == pmc->eventsel)
return 0;
if (!(data & pmu->reserved_bits)) {
- reprogram_gp_counter(pmc, data);
+ reprogram_gp_counter(pmc, data, false);
return 0;
}
}
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 3f723a3..15b5f05 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -48,7 +48,8 @@ static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data)
if (old_ctrl == new_ctrl)
continue;
- reprogram_fixed_counter(pmc, new_ctrl, i);
+ reprogram_fixed_counter(pmc, new_ctrl, i,
+ (pmu->pebs_enable & BIT_ULL(i + INTEL_PMC_IDX_FIXED)));
}
pmu->fixed_ctr_ctrl = data;
@@ -292,7 +293,8 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (data == pmc->eventsel)
return 0;
if (!(data & pmu->reserved_bits)) {
- reprogram_gp_counter(pmc, data);
+ reprogram_gp_counter(pmc, data,
+ (pmu->pebs_enable & BIT_ULL(pmc->idx)));
return 0;
}
} else if ((pmc = get_gp_pmc(pmu, msr, MSR_RELOAD_PMC0)) ||
@@ -301,10 +303,8 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (data == pmc->reload_cnt)
return 0;
if (!(data & ~pmc_bitmask(pmc))) {
- int pmc_idx = pmc_is_fixed(pmc) ? pmc->idx +
- INTEL_PMC_IDX_FIXED : pmc->idx;
pmc->reload_cnt = data;
- reprogram_counter(pmu, pmc_idx);
+ reprogram_counter(pmu, pmc->idx);
return 0;
}
}
--
1.8.3.1
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