Introduce a new callback msr_idx_to_pmc that returns a struct kvm_pmc*,
and change kvm_pmu_is_valid_msr to return ".msr_idx_to_pmc(vcpu, msr) ||
.is_valid_msr(vcpu, msr)" and AMD just returns false from .is_valid_msr.
Suggested-by: Paolo Bonzini <[email protected]>
Signed-off-by: Like Xu <[email protected]>
---
arch/x86/kvm/pmu.c | 3 ++-
arch/x86/kvm/pmu.h | 1 +
arch/x86/kvm/pmu_amd.c | 15 +++++++++++----
arch/x86/kvm/vmx/pmu_intel.c | 13 +++++++++++++
4 files changed, 27 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index de362ba0df01..39a259b701e0 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -339,7 +339,8 @@ void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu)
bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
{
- return kvm_x86_ops->pmu_ops->is_valid_msr(vcpu, msr);
+ return kvm_x86_ops->pmu_ops->msr_idx_to_pmc(vcpu, msr) ||
+ kvm_x86_ops->pmu_ops->is_valid_msr(vcpu, msr);
}
int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index c3faa70d9886..3b4f1942d206 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -27,6 +27,7 @@ struct kvm_pmu_ops {
struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
struct kvm_pmc *(*rdpmc_idx_to_pmc)(struct kvm_vcpu *vcpu,
unsigned int idx, u64 *mask);
+ struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, u32 msr);
int (*is_valid_rdpmc_idx)(struct kvm_vcpu *vcpu, unsigned int idx);
bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr);
int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
diff --git a/arch/x86/kvm/pmu_amd.c b/arch/x86/kvm/pmu_amd.c
index 759b090f8140..88fe3f5f5bd1 100644
--- a/arch/x86/kvm/pmu_amd.c
+++ b/arch/x86/kvm/pmu_amd.c
@@ -199,14 +199,20 @@ static struct kvm_pmc *amd_rdpmc_idx_to_pmc(struct kvm_vcpu *vcpu,
}
static bool amd_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
+{
+ /* please use kvm_pmu_is_valid_msr() instead */
+ return false;
+}
+
+struct kvm_pmc *amd_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
- int ret = false;
+ struct kvm_pmc *pmc;
- ret = get_gp_pmc_amd(pmu, msr, PMU_TYPE_COUNTER) ||
- get_gp_pmc_amd(pmu, msr, PMU_TYPE_EVNTSEL);
+ pmc = get_gp_pmc_amd(pmu, msr, PMU_TYPE_COUNTER);
+ pmc = pmc ? pmc : get_gp_pmc_amd(pmu, msr, PMU_TYPE_EVNTSEL);
- return ret;
+ return pmc;
}
static int amd_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
@@ -308,6 +314,7 @@ struct kvm_pmu_ops amd_pmu_ops = {
.pmc_is_enabled = amd_pmc_is_enabled,
.pmc_idx_to_pmc = amd_pmc_idx_to_pmc,
.rdpmc_idx_to_pmc = amd_rdpmc_idx_to_pmc,
+ .msr_idx_to_pmc = amd_msr_idx_to_pmc,
.is_valid_rdpmc_idx = amd_is_valid_rdpmc_idx,
.is_valid_msr = amd_is_valid_msr,
.get_msr = amd_pmu_get_msr,
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 8b999dae15f2..714afcd9244c 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -162,6 +162,18 @@ static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
return ret;
}
+struct kvm_pmc *intel_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
+{
+ struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
+ struct kvm_pmc *pmc;
+
+ pmc = get_fixed_pmc(pmu, msr);
+ pmc = pmc ? pmc : get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0);
+ pmc = pmc ? pmc : get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0);
+
+ return pmc;
+}
+
static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
@@ -367,6 +379,7 @@ struct kvm_pmu_ops intel_pmu_ops = {
.pmc_is_enabled = intel_pmc_is_enabled,
.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
.rdpmc_idx_to_pmc = intel_rdpmc_idx_to_pmc,
+ .msr_idx_to_pmc = intel_msr_idx_to_pmc,
.is_valid_rdpmc_idx = intel_is_valid_rdpmc_idx,
.is_valid_msr = intel_is_valid_msr,
.get_msr = intel_pmu_get_msr,
--
2.21.0
Fixes: 0ca8f3f79a8c ("KVM: x86/vPMU: Introduce a new kvm_pmu_ops->msr_idx_to_pmc callback")
Signed-off-by: kbuild test robot <[email protected]>
---
pmu_amd.c | 2 +-
vmx/pmu_intel.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/pmu_amd.c b/arch/x86/kvm/pmu_amd.c
index 88fe3f5f5bd18..ce61d180cf70c 100644
--- a/arch/x86/kvm/pmu_amd.c
+++ b/arch/x86/kvm/pmu_amd.c
@@ -204,7 +204,7 @@ static bool amd_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
return false;
}
-struct kvm_pmc *amd_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
+static struct kvm_pmc *amd_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
struct kvm_pmc *pmc;
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 714afcd9244ca..95f0ff9e39f3c 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -162,7 +162,7 @@ static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
return ret;
}
-struct kvm_pmc *intel_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
+static struct kvm_pmc *intel_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
struct kvm_pmc *pmc;
Hi Like,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on kvm/linux-next]
[cannot apply to v5.4-rc4 next-20191025]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
url: https://github.com/0day-ci/linux/commits/Like-Xu/KVM-x86-vPMU-Efficiency-optimization-by-reusing-last-created-perf_event/20191024-164128
base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-dirty
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <[email protected]>
sparse warnings: (new ones prefixed by >>)
>> arch/x86/kvm/vmx/pmu_intel.c:165:16: sparse: sparse: symbol 'intel_msr_idx_to_pmc' was not declared. Should it be static?
--
>> arch/x86/kvm/pmu_amd.c:207:16: sparse: sparse: symbol 'amd_msr_idx_to_pmc' was not declared. Should it be static?
Please review and possibly fold the followup patch.
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation