From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Like Xu <like.xu.linux@gmail.com>, Like Xu <likexu@tencent.com>,
Jim Mattson <jmattson@google.com>,
Sandipan Das <sandipan.das@amd.com>
Subject: [PATCH v7 10/12] KVM: x86/cpuid: Add a KVM-only leaf to redirect AMD PerfMonV2 flag
Date: Fri, 2 Jun 2023 18:10:56 -0700 [thread overview]
Message-ID: <20230603011058.1038821-11-seanjc@google.com> (raw)
In-Reply-To: <20230603011058.1038821-1-seanjc@google.com>
From: Like Xu <likexu@tencent.com>
Add a KVM-only leaf for AMD's PerfMonV2 to redirect the kernel's scattered
version to its architectural location, e.g. so that KVM can query guest
support via guest_cpuid_has().
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Like Xu <likexu@tencent.com>
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/reverse_cpuid.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index a5717282bb9c..56cbdb24400a 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -15,6 +15,7 @@ enum kvm_only_cpuid_leafs {
CPUID_12_EAX = NCAPINTS,
CPUID_7_1_EDX,
CPUID_8000_0007_EDX,
+ CPUID_8000_0022_EAX,
NR_KVM_CPU_CAPS,
NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS,
@@ -47,6 +48,9 @@ enum kvm_only_cpuid_leafs {
/* CPUID level 0x80000007 (EDX). */
#define KVM_X86_FEATURE_CONSTANT_TSC KVM_X86_FEATURE(CPUID_8000_0007_EDX, 8)
+/* CPUID level 0x80000022 (EAX) */
+#define KVM_X86_FEATURE_PERFMON_V2 KVM_X86_FEATURE(CPUID_8000_0022_EAX, 0)
+
struct cpuid_reg {
u32 function;
u32 index;
@@ -74,6 +78,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
[CPUID_7_1_EDX] = { 7, 1, CPUID_EDX},
[CPUID_8000_0007_EDX] = {0x80000007, 0, CPUID_EDX},
[CPUID_8000_0021_EAX] = {0x80000021, 0, CPUID_EAX},
+ [CPUID_8000_0022_EAX] = {0x80000022, 0, CPUID_EAX},
};
/*
@@ -108,6 +113,8 @@ static __always_inline u32 __feature_translate(int x86_feature)
return KVM_X86_FEATURE_SGX_EDECCSSA;
else if (x86_feature == X86_FEATURE_CONSTANT_TSC)
return KVM_X86_FEATURE_CONSTANT_TSC;
+ else if (x86_feature == X86_FEATURE_PERFMON_V2)
+ return KVM_X86_FEATURE_PERFMON_V2;
return x86_feature;
}
--
2.41.0.rc2.161.g9c6817b8e7-goog
next prev parent reply other threads:[~2023-06-03 1:12 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-03 1:10 [PATCH v7 00/12] KVM: x86: Add AMD Guest PerfMonV2 PMU support Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 01/12] KVM: x86/pmu: Rename global_ovf_ctrl_mask to global_status_mask Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 02/12] KVM: x86/pmu: Move reprogram_counters() to pmu.h Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 03/12] KVM: x86/pmu: Reject userspace attempts to set reserved GLOBAL_STATUS bits Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 04/12] KVM: x86/pmu: Move handling PERF_GLOBAL_CTRL and friends to common x86 Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 05/12] KVM: x86/pmu: Provide Intel PMU's pmc_is_enabled() as generic x86 code Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 06/12] KVM: x86: Explicitly zero cpuid "0xa" leaf when PMU is disabled Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 07/12] KVM: x86/pmu: Disable vPMU if the minimum num of counters isn't met Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 08/12] KVM: x86/pmu: Advertise PERFCTR_CORE iff the min nr of counters is met Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 09/12] KVM: x86/pmu: Constrain the num of guest counters with kvm_pmu_cap Sean Christopherson
2023-06-03 1:10 ` Sean Christopherson [this message]
2023-06-03 1:10 ` [PATCH v7 11/12] KVM: x86/svm/pmu: Add AMD PerfMonV2 support Sean Christopherson
2023-06-03 1:10 ` [PATCH v7 12/12] KVM: x86/cpuid: Add AMD CPUID ExtPerfMonAndDbg leaf 0x80000022 Sean Christopherson
2023-06-07 0:55 ` [PATCH v7 00/12] KVM: x86: Add AMD Guest PerfMonV2 PMU support Sean Christopherson
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