linux-kernel - [PATCH v4 3/5] KVM: VMX: Move vmx_get_perf

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Message-ID: <20220901173258.925729-4-seanjc@google.com>
Date:   Thu,  1 Sep 2022 17:32:56 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Like Xu <like.xu.linux@...il.com>
Subject: [PATCH v4 3/5] KVM: VMX: Move vmx_get_perf_capabilities() definition
 to vmx.c

Move vmx_get_perf_capabilities() to vmx.c as a non-inline function so
that it can safely reference x86_perf_get_lbr(), which is available iff
CPU_SUP_INTEL=y, i.e. only if kvm_intel is being built.  The helper is
non-trivial and isn't used in any paths that are performance critical,
i.e. doesn't need to be inlined.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/capabilities.h | 24 ++----------------------
 arch/x86/kvm/vmx/vmx.c          | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index c5e5dfef69c7..23dca5ebae16 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -75,6 +75,8 @@ struct vmx_capability {
 };
 extern struct vmx_capability vmx_capability;
 
+u64 vmx_get_perf_capabilities(void);
+
 static inline bool cpu_has_vmx_basic_inout(void)
 {
 	return	(((u64)vmcs_config.basic_cap << 32) & VMX_BASIC_INOUT);
@@ -401,28 +403,6 @@ static inline bool vmx_pebs_supported(void)
 	return boot_cpu_has(X86_FEATURE_PEBS) && kvm_pmu_cap.pebs_ept;
 }
 
-static inline u64 vmx_get_perf_capabilities(void)
-{
-	u64 perf_cap = PMU_CAP_FW_WRITES;
-	u64 host_perf_cap = 0;
-
-	if (!enable_pmu)
-		return 0;
-
-	if (boot_cpu_has(X86_FEATURE_PDCM))
-		rdmsrl(MSR_IA32_PERF_CAPABILITIES, host_perf_cap);
-
-	perf_cap |= host_perf_cap & PMU_CAP_LBR_FMT;
-
-	if (vmx_pebs_supported()) {
-		perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK;
-		if ((perf_cap & PERF_CAP_PEBS_FORMAT) < 4)
-			perf_cap &= ~PERF_CAP_PEBS_BASELINE;
-	}
-
-	return perf_cap;
-}
-
 static inline u64 vmx_supported_debugctl(void)
 {
 	u64 debugctl = 0;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c9b49a09e6b5..657fa9908bf9 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1826,6 +1826,28 @@ static inline bool vmx_feature_control_msr_valid(struct kvm_vcpu *vcpu,
 	return !(val & ~valid_bits);
 }
 
+u64 vmx_get_perf_capabilities(void)
+{
+	u64 perf_cap = PMU_CAP_FW_WRITES;
+	u64 host_perf_cap = 0;
+
+	if (!enable_pmu)
+		return 0;
+
+	if (boot_cpu_has(X86_FEATURE_PDCM))
+		rdmsrl(MSR_IA32_PERF_CAPABILITIES, host_perf_cap);
+
+	perf_cap |= host_perf_cap & PMU_CAP_LBR_FMT;
+
+	if (vmx_pebs_supported()) {
+		perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK;
+		if ((perf_cap & PERF_CAP_PEBS_FORMAT) < 4)
+			perf_cap &= ~PERF_CAP_PEBS_BASELINE;
+	}
+
+	return perf_cap;
+}
+
 static int vmx_get_msr_feature(struct kvm_msr_entry *msr)
 {
 	switch (msr->index) {
-- 
2.37.2.789.g6183377224-goog