KVM: x86/pmu: Move kvm_init_pmu_capability() to pmu.c

Move kvm_init_pmu_capability() to pmu.c so that future changes can access
variables that have no business being visible outside of pmu.c.
kvm_init_pmu_capability() is called once per module load, there's is zero
reason it needs to be inlined.

No functional change intended.

Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20250805190526.1453366-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

arch/x86/kvm/pmu.c

@@ -96,6 +96,53 @@ void kvm_pmu_ops_update(const struct kvm_pmu_ops *pmu_ops)
 #undef __KVM_X86_PMU_OP
 }
 
+void kvm_init_pmu_capability(const struct kvm_pmu_ops *pmu_ops)
+{
+	bool is_intel = boot_cpu_data.x86_vendor == X86_VENDOR_INTEL;
+	int min_nr_gp_ctrs = pmu_ops->MIN_NR_GP_COUNTERS;
+
+	/*
+	 * Hybrid PMUs don't play nice with virtualization without careful
+	 * configuration by userspace, and KVM's APIs for reporting supported
+	 * vPMU features do not account for hybrid PMUs.  Disable vPMU support
+	 * for hybrid PMUs until KVM gains a way to let userspace opt-in.
+	 */
+	if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
+		enable_pmu = false;
+
+	if (enable_pmu) {
+		perf_get_x86_pmu_capability(&kvm_pmu_cap);
+
+		/*
+		 * WARN if perf did NOT disable hardware PMU if the number of
+		 * architecturally required GP counters aren't present, i.e. if
+		 * there are a non-zero number of counters, but fewer than what
+		 * is architecturally required.
+		 */
+		if (!kvm_pmu_cap.num_counters_gp ||
+		    WARN_ON_ONCE(kvm_pmu_cap.num_counters_gp < min_nr_gp_ctrs))
+			enable_pmu = false;
+		else if (is_intel && !kvm_pmu_cap.version)
+			enable_pmu = false;
+	}
+
+	if (!enable_pmu) {
+		memset(&kvm_pmu_cap, 0, sizeof(kvm_pmu_cap));
+		return;
+	}
+
+	kvm_pmu_cap.version = min(kvm_pmu_cap.version, 2);
+	kvm_pmu_cap.num_counters_gp = min(kvm_pmu_cap.num_counters_gp,
+					  pmu_ops->MAX_NR_GP_COUNTERS);
+	kvm_pmu_cap.num_counters_fixed = min(kvm_pmu_cap.num_counters_fixed,
+					     KVM_MAX_NR_FIXED_COUNTERS);
+
+	kvm_pmu_eventsel.INSTRUCTIONS_RETIRED =
+		perf_get_hw_event_config(PERF_COUNT_HW_INSTRUCTIONS);
+	kvm_pmu_eventsel.BRANCH_INSTRUCTIONS_RETIRED =
+		perf_get_hw_event_config(PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
+}
+
 static inline void __kvm_perf_overflow(struct kvm_pmc *pmc, bool in_pmi)
 {
 	struct kvm_pmu *pmu = pmc_to_pmu(pmc);

arch/x86/kvm/pmu.h

@@ -180,52 +180,7 @@ static inline bool pmc_speculative_in_use(struct kvm_pmc *pmc)
 extern struct x86_pmu_capability kvm_pmu_cap;
 extern struct kvm_pmu_emulated_event_selectors kvm_pmu_eventsel;
 
-static inline void kvm_init_pmu_capability(const struct kvm_pmu_ops *pmu_ops)
-{
-	bool is_intel = boot_cpu_data.x86_vendor == X86_VENDOR_INTEL;
-	int min_nr_gp_ctrs = pmu_ops->MIN_NR_GP_COUNTERS;
-
-	/*
-	 * Hybrid PMUs don't play nice with virtualization without careful
-	 * configuration by userspace, and KVM's APIs for reporting supported
-	 * vPMU features do not account for hybrid PMUs.  Disable vPMU support
-	 * for hybrid PMUs until KVM gains a way to let userspace opt-in.
-	 */
-	if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
-		enable_pmu = false;
-
-	if (enable_pmu) {
-		perf_get_x86_pmu_capability(&kvm_pmu_cap);
-
-		/*
-		 * WARN if perf did NOT disable hardware PMU if the number of
-		 * architecturally required GP counters aren't present, i.e. if
-		 * there are a non-zero number of counters, but fewer than what
-		 * is architecturally required.
-		 */
-		if (!kvm_pmu_cap.num_counters_gp ||
-		    WARN_ON_ONCE(kvm_pmu_cap.num_counters_gp < min_nr_gp_ctrs))
-			enable_pmu = false;
-		else if (is_intel && !kvm_pmu_cap.version)
-			enable_pmu = false;
-	}
-
-	if (!enable_pmu) {
-		memset(&kvm_pmu_cap, 0, sizeof(kvm_pmu_cap));
-		return;
-	}
-
-	kvm_pmu_cap.version = min(kvm_pmu_cap.version, 2);
-	kvm_pmu_cap.num_counters_gp = min(kvm_pmu_cap.num_counters_gp,
-					  pmu_ops->MAX_NR_GP_COUNTERS);
-	kvm_pmu_cap.num_counters_fixed = min(kvm_pmu_cap.num_counters_fixed,
-					     KVM_MAX_NR_FIXED_COUNTERS);
-
-	kvm_pmu_eventsel.INSTRUCTIONS_RETIRED =
-		perf_get_hw_event_config(PERF_COUNT_HW_INSTRUCTIONS);
-	kvm_pmu_eventsel.BRANCH_INSTRUCTIONS_RETIRED =
-		perf_get_hw_event_config(PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
-}
+void kvm_init_pmu_capability(const struct kvm_pmu_ops *pmu_ops);
 
 static inline void kvm_pmu_request_counter_reprogram(struct kvm_pmc *pmc)
 {