linux-kernel - [PATCH v9 08/28] KVM: x86/pmu: Apply "fast" RDPMC only to Intel PMUs

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Message-ID: <20231202000417.922113-9-seanjc@google.com>
Date:   Fri,  1 Dec 2023 16:03:57 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Dapeng Mi <dapeng1.mi@...ux.intel.com>,
        Jim Mattson <jmattson@...gle.com>,
        Jinrong Liang <cloudliang@...cent.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Like Xu <likexu@...cent.com>
Subject: [PATCH v9 08/28] KVM: x86/pmu: Apply "fast" RDPMC only to Intel PMUs

Move the handling of "fast" RDPMC instructions, which drop bits 63:32 of
the count, to Intel.  The "fast" flag, and all flags for that matter, are
Intel-only and aren't supported by AMD.

Opportunistically replace open coded bit crud with proper #defines.

Fixes: ca724305a2b0 ("KVM: x86/vPMU: Implement AMD vPMU code for KVM")
Reviewed-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/pmu.c           |  3 +--
 arch/x86/kvm/vmx/pmu_intel.c | 11 +++++++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 0b0d804ee239..09b0feb975c3 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -576,10 +576,9 @@ static int kvm_pmu_rdpmc_vmware(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
 
 int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
 {
-	bool fast_mode = idx & (1u << 31);
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	struct kvm_pmc *pmc;
-	u64 mask = fast_mode ? ~0u : ~0ull;
+	u64 mask = ~0ull;
 
 	if (!pmu->version)
 		return 1;
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 1b1f888ad32b..6903dd9b71ad 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -20,6 +20,10 @@
 #include "nested.h"
 #include "pmu.h"
 
+/* Perf's "BASE" is wildly misleading, this is a single-bit flag, not a base. */
+#define INTEL_RDPMC_FIXED	INTEL_PMC_FIXED_RDPMC_BASE
+#define INTEL_RDPMC_FAST	BIT(31)
+
 #define MSR_PMC_FULL_WIDTH_BIT      (MSR_IA32_PMC0 - MSR_IA32_PERFCTR0)
 
 static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data)
@@ -59,11 +63,14 @@ static struct kvm_pmc *intel_rdpmc_ecx_to_pmc(struct kvm_vcpu *vcpu,
 					    unsigned int idx, u64 *mask)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
-	bool fixed = idx & (1u << 30);
+	bool fixed = idx & INTEL_RDPMC_FIXED;
 	struct kvm_pmc *counters;
 	unsigned int num_counters;
 
-	idx &= ~(3u << 30);
+	if (idx & INTEL_RDPMC_FAST)
+		*mask &= GENMASK_ULL(31, 0);
+
+	idx &= ~(INTEL_RDPMC_FIXED | INTEL_RDPMC_FAST);
 	if (fixed) {
 		counters = pmu->fixed_counters;
 		num_counters = pmu->nr_arch_fixed_counters;
-- 
2.43.0.rc2.451.g8631bc7472-goog