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Message-Id: <20211108111032.24457-5-likexu@tencent.com>
Date: Mon, 8 Nov 2021 19:10:29 +0800
From: Like Xu <like.xu.linux@...il.com>
To: Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/7] KVM: x86: Copy kvm_pmu_ops by value to eliminate layer of indirection
From: Like Xu <likexu@...cent.com>
Replace the kvm_pmu_ops pointer in common x86 with an instance of the
struct to save one pointer dereference when invoking functions. Copy the
struct by value to set the ops during kvm_init().
Signed-off-by: Like Xu <likexu@...cent.com>
---
arch/x86/kvm/pmu.c | 41 ++++++++++++++++++++++-------------------
arch/x86/kvm/pmu.h | 4 +++-
arch/x86/kvm/x86.c | 1 +
3 files changed, 26 insertions(+), 20 deletions(-)
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index aa6ac9c7aff2..353989bf0102 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -47,6 +47,9 @@
* * AMD: [0 .. AMD64_NUM_COUNTERS-1] <=> gp counters
*/
+struct kvm_pmu_ops kvm_pmu_ops __read_mostly;
+EXPORT_SYMBOL_GPL(kvm_pmu_ops);
+
static void kvm_pmi_trigger_fn(struct irq_work *irq_work)
{
struct kvm_pmu *pmu = container_of(irq_work, struct kvm_pmu, irq_work);
@@ -214,7 +217,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
ARCH_PERFMON_EVENTSEL_CMASK |
HSW_IN_TX |
HSW_IN_TX_CHECKPOINTED))) {
- config = kvm_x86_ops.pmu_ops->find_arch_event(pmc_to_pmu(pmc),
+ config = kvm_pmu_ops.find_arch_event(pmc_to_pmu(pmc),
event_select,
unit_mask);
if (config != PERF_COUNT_HW_MAX)
@@ -268,7 +271,7 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)
pmc->current_config = (u64)ctrl;
pmc_reprogram_counter(pmc, PERF_TYPE_HARDWARE,
- kvm_x86_ops.pmu_ops->find_fixed_event(idx),
+ kvm_pmu_ops.find_fixed_event(idx),
!(en_field & 0x2), /* exclude user */
!(en_field & 0x1), /* exclude kernel */
pmi, false, false);
@@ -277,7 +280,7 @@ EXPORT_SYMBOL_GPL(reprogram_fixed_counter);
void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx)
{
- struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, pmc_idx);
+ struct kvm_pmc *pmc = kvm_pmu_ops.pmc_idx_to_pmc(pmu, pmc_idx);
if (!pmc)
return;
@@ -299,7 +302,7 @@ void kvm_pmu_handle_event(struct kvm_vcpu *vcpu)
int bit;
for_each_set_bit(bit, pmu->reprogram_pmi, X86_PMC_IDX_MAX) {
- struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, bit);
+ struct kvm_pmc *pmc = kvm_pmu_ops.pmc_idx_to_pmc(pmu, bit);
if (unlikely(!pmc || !pmc->perf_event)) {
clear_bit(bit, pmu->reprogram_pmi);
@@ -321,7 +324,7 @@ void kvm_pmu_handle_event(struct kvm_vcpu *vcpu)
/* check if idx is a valid index to access PMU */
int kvm_pmu_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx)
{
- return kvm_x86_ops.pmu_ops->is_valid_rdpmc_ecx(vcpu, idx);
+ return kvm_pmu_ops.is_valid_rdpmc_ecx(vcpu, idx);
}
bool is_vmware_backdoor_pmc(u32 pmc_idx)
@@ -371,7 +374,7 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
if (is_vmware_backdoor_pmc(idx))
return kvm_pmu_rdpmc_vmware(vcpu, idx, data);
- pmc = kvm_x86_ops.pmu_ops->rdpmc_ecx_to_pmc(vcpu, idx, &mask);
+ pmc = kvm_pmu_ops.rdpmc_ecx_to_pmc(vcpu, idx, &mask);
if (!pmc)
return 1;
@@ -387,23 +390,23 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu)
{
if (lapic_in_kernel(vcpu)) {
- if (kvm_x86_ops.pmu_ops->deliver_pmi)
- kvm_x86_ops.pmu_ops->deliver_pmi(vcpu);
+ if (kvm_pmu_ops.deliver_pmi)
+ kvm_pmu_ops.deliver_pmi(vcpu);
kvm_apic_local_deliver(vcpu->arch.apic, APIC_LVTPC);
}
}
bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
{
- return kvm_x86_ops.pmu_ops->msr_idx_to_pmc(vcpu, msr) ||
- kvm_x86_ops.pmu_ops->is_valid_msr(vcpu, msr);
+ return kvm_pmu_ops.msr_idx_to_pmc(vcpu, msr) ||
+ kvm_pmu_ops.is_valid_msr(vcpu, msr);
}
EXPORT_SYMBOL_GPL(kvm_pmu_is_valid_msr);
static void kvm_pmu_mark_pmc_in_use(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
- struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->msr_idx_to_pmc(vcpu, msr);
+ struct kvm_pmc *pmc = kvm_pmu_ops.msr_idx_to_pmc(vcpu, msr);
if (pmc)
__set_bit(pmc->idx, pmu->pmc_in_use);
@@ -411,13 +414,13 @@ static void kvm_pmu_mark_pmc_in_use(struct kvm_vcpu *vcpu, u32 msr)
int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
- return kvm_x86_ops.pmu_ops->get_msr(vcpu, msr_info);
+ return kvm_pmu_ops.get_msr(vcpu, msr_info);
}
int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
kvm_pmu_mark_pmc_in_use(vcpu, msr_info->index);
- return kvm_x86_ops.pmu_ops->set_msr(vcpu, msr_info);
+ return kvm_pmu_ops.set_msr(vcpu, msr_info);
}
/* refresh PMU settings. This function generally is called when underlying
@@ -426,7 +429,7 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
*/
void kvm_pmu_refresh(struct kvm_vcpu *vcpu)
{
- kvm_x86_ops.pmu_ops->refresh(vcpu);
+ kvm_pmu_ops.refresh(vcpu);
}
void kvm_pmu_reset(struct kvm_vcpu *vcpu)
@@ -434,7 +437,7 @@ void kvm_pmu_reset(struct kvm_vcpu *vcpu)
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
irq_work_sync(&pmu->irq_work);
- kvm_x86_ops.pmu_ops->reset(vcpu);
+ kvm_pmu_ops.reset(vcpu);
}
void kvm_pmu_init(struct kvm_vcpu *vcpu)
@@ -442,7 +445,7 @@ void kvm_pmu_init(struct kvm_vcpu *vcpu)
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
memset(pmu, 0, sizeof(*pmu));
- kvm_x86_ops.pmu_ops->init(vcpu);
+ kvm_pmu_ops.init(vcpu);
init_irq_work(&pmu->irq_work, kvm_pmi_trigger_fn);
pmu->event_count = 0;
pmu->need_cleanup = false;
@@ -474,14 +477,14 @@ void kvm_pmu_cleanup(struct kvm_vcpu *vcpu)
pmu->pmc_in_use, X86_PMC_IDX_MAX);
for_each_set_bit(i, bitmask, X86_PMC_IDX_MAX) {
- pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, i);
+ pmc = kvm_pmu_ops.pmc_idx_to_pmc(pmu, i);
if (pmc && pmc->perf_event && !pmc_speculative_in_use(pmc))
pmc_stop_counter(pmc);
}
- if (kvm_x86_ops.pmu_ops->cleanup)
- kvm_x86_ops.pmu_ops->cleanup(vcpu);
+ if (kvm_pmu_ops.cleanup)
+ kvm_pmu_ops.cleanup(vcpu);
bitmap_zero(pmu->pmc_in_use, X86_PMC_IDX_MAX);
}
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 0e4f2b1fa9fb..b2fe135d395a 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -17,6 +17,8 @@
#define MAX_FIXED_COUNTERS 3
+extern struct kvm_pmu_ops kvm_pmu_ops;
+
struct kvm_event_hw_type_mapping {
u8 eventsel;
u8 unit_mask;
@@ -92,7 +94,7 @@ static inline bool pmc_is_fixed(struct kvm_pmc *pmc)
static inline bool pmc_is_enabled(struct kvm_pmc *pmc)
{
- return kvm_x86_ops.pmu_ops->pmc_is_enabled(pmc);
+ return kvm_pmu_ops.pmc_is_enabled(pmc);
}
static inline bool kvm_valid_perf_global_ctrl(struct kvm_pmu *pmu,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0aee0a078d6f..ca9a76abb6ba 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11323,6 +11323,7 @@ int kvm_arch_hardware_setup(void *opaque)
return r;
memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops));
+ memcpy(&kvm_pmu_ops, kvm_x86_ops.pmu_ops, sizeof(kvm_pmu_ops));
kvm_ops_static_call_update();
if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES))
--
2.33.0
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