KVM: x86/pmu: Use different raw event masks for AMD and Intel

[ Upstream commit 95b065bf5c431c06c68056a03a5853b660640ecc ]

The third nybble of AMD's event select overlaps with Intel's IN_TX and
IN_TXCP bits. Therefore, we can't use AMD64_RAW_EVENT_MASK on Intel
platforms that support TSX.

Declare a raw_event_mask in the kvm_pmu structure, initialize it in
the vendor-specific pmu_refresh() functions, and use that mask for
PERF_TYPE_RAW configurations in reprogram_gp_counter().

Fixes: 710c47651431 ("KVM: x86/pmu: Use AMD64_RAW_EVENT_MASK for PERF_TYPE_RAW")
Signed-off-by: Jim Mattson <jmattson@google.com>
Message-Id: <20220308012452.3468611-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0175919..d9bb5cd 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -505,6 +505,7 @@ struct kvm_pmu {
        u64 global_ctrl_mask;
        u64 global_ovf_ctrl_mask;
        u64 reserved_bits;
+       u64 raw_event_mask;
        u8 version;
        struct kvm_pmc gp_counters[INTEL_PMC_MAX_GENERIC];
        struct kvm_pmc fixed_counters[INTEL_PMC_MAX_FIXED];

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index f256f01..44a5ab9 100644 (file)
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -178,6 +178,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
        struct kvm *kvm = pmc->vcpu->kvm;
        struct kvm_pmu_event_filter *filter;
        int i;
+       struct kvm_pmu *pmu = vcpu_to_pmu(pmc->vcpu);
        bool allow_event = true;
 
        if (eventsel & ARCH_PERFMON_EVENTSEL_PIN_CONTROL)
@@ -217,7 +218,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
        }
 
        if (type == PERF_TYPE_RAW)
-               config = eventsel & AMD64_RAW_EVENT_MASK;
+               config = eventsel & pmu->raw_event_mask;
 
        if (pmc->current_config == eventsel && pmc_resume_counter(pmc))
                return;

diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index 06f8034..3691643 100644 (file)
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -283,6 +283,7 @@ static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
 
        pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << 48) - 1;
        pmu->reserved_bits = 0xfffffff000280000ull;
+       pmu->raw_event_mask = AMD64_RAW_EVENT_MASK;
        pmu->version = 1;
        /* not applicable to AMD; but clean them to prevent any fall out */
        pmu->counter_bitmask[KVM_PMC_FIXED] = 0;

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 6427d95..db1b884 100644 (file)
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -478,6 +478,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
        pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
        pmu->version = 0;
        pmu->reserved_bits = 0xffffffff00200000ull;
+       pmu->raw_event_mask = X86_RAW_EVENT_MASK;
 
        entry = kvm_find_cpuid_entry(vcpu, 0xa, 0);
        if (!entry)