[PATCH v2 31/54] KVM: x86/pmu: Make check_pmu_event_filter() an exported function

Mingwei Zhang
2024-05-06T05:31:26Z

Make check_pmu_event_filter() exported to usable by vendor modules like
kvm_intel. This is because passthrough PMU intercept the guest writes to
event selectors and directly do the event filter checking inside the vendor
specific set_msr() instead of deferring to the KVM_REQ_PMU handler.

Signed-off-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
---
arch/x86/kvm/pmu.c | 3 ++-
arch/x86/kvm/pmu.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 13197472e31d..0f587651a49e 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -443,7 +443,7 @@ static bool is_fixed_event_allowed(struct kvm_x86_pmu_event_filter *filter,
return true;
}

-static bool check_pmu_event_filter(struct kvm_pmc *pmc)
+bool check_pmu_event_filter(struct kvm_pmc *pmc)
{
struct kvm_x86_pmu_event_filter *filter;
struct kvm *kvm = pmc->vcpu->kvm;
@@ -457,6 +457,7 @@ static bool check_pmu_event_filter(struct kvm_pmc *pmc)

return is_fixed_event_allowed(filter, pmc->idx);
}
+EXPORT_SYMBOL_GPL(check_pmu_event_filter);

static bool pmc_event_is_allowed(struct kvm_pmc *pmc)
{
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 8bd4b79e363f..9cde62f3988e 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -298,6 +298,7 @@ bool kvm_pmu_check_rdpmc_passthrough(struct kvm_vcpu *vcpu);
void kvm_pmu_passthrough_pmu_msrs(struct kvm_vcpu *vcpu);
void kvm_pmu_save_pmu_context(struct kvm_vcpu *vcpu);
void kvm_pmu_restore_pmu_context(struct kvm_vcpu *vcpu);
+bool check_pmu_event_filter(struct kvm_pmc *pmc);

bool is_vmware_backdoor_pmc(u32 pmc_idx);

--
2.45.0.rc1.225.g2a3ae87e7f-goog