[RFC,v3,34/58] KVM: x86/pmu: Make check_pmu_event_filter() an exported function

Commit Message

Mingwei Zhang Aug. 1, 2024, 4:58 a.m. UTC

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 <[e-mail]>
Signed-off-by: Dapeng Mi <[e-mail]>
Tested-by: Yongwei Ma <[e-mail]>
---
 arch/x86/kvm/pmu.c | 3 ++-
 arch/x86/kvm/pmu.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

Patch

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 9bb733384069..9aa08472b7df 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);