From nobody Mon Feb 9 13:58:20 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5816C77B7A for ; Sat, 3 Jun 2023 01:12:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237262AbjFCBML (ORCPT ); Fri, 2 Jun 2023 21:12:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43516 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237145AbjFCBLp (ORCPT ); Fri, 2 Jun 2023 21:11:45 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5EE601702 for ; Fri, 2 Jun 2023 18:11:24 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id d9443c01a7336-1b1bd4fcc22so5544585ad.2 for ; Fri, 02 Jun 2023 18:11:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1685754684; x=1688346684; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=O6aZ99/gTomPSpDx04dBgMUhLAou1VtK/fDnLslrZmU=; b=x7HWDH8/Bs9YtzCXj/mrZ81zxYF5I7CITbLVs3xIKM9SDl8Dj5A8nTCf6r3RXcbCn2 blMFBeeTkuC5motXASnEpV1/tXRACqNxLOenferCAhBm54ivgYoqeyd48H878wW44RUh Be2SKu4/9omccwscEsK5eKJS32/tTOLSkQ/MwCfR1wvFCrEtth7QbICvOK5L2RRkCHhw GIKF2gf1ztel2DMowiBL4haf3VfY/E/eR3BvaajX65im7/Y3zWITDuCfOC8qWpfWQ2Av 4uZxD2JZrD2g+4zgtsr6pxlRtA51RsTEYC4LdQQ/KJSmyBYowcXw1YoXo021O2sAwHNA XO+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685754684; x=1688346684; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=O6aZ99/gTomPSpDx04dBgMUhLAou1VtK/fDnLslrZmU=; b=Ktf/Mi/skb7IRM9+PgetrfkVejV+/Omx8bHNjpSr5GrKAIRgWnbU8r+ldZ0nSdJazw lsKw1jWPu55nbpNaWCRBGXoI5CWVfqzwNAxl3oIQ5NbhCiodIKzS57wZ59e58rSY2gAi QcsjOmOEmDELXYpAdHeIKB3WZt4tBftsKCwHjTVTyH8nK5+Ty44Nwd3ZT1YWLqzt5Hr/ hobgI8pB9XzIxgt1Y4aQNtjohAA1CKBIyEPdxNHVXwLwr3oJ0FHTQ0IsPPs5aot/5nai puMVdFjbwzng1V2mtYVeuJek260ilFkO2vdGbRZLKqKdcQ0uPXdihjTNyuRgzkRPtQit CQVQ== X-Gm-Message-State: AC+VfDyUfYhL1ES5c1DSRGV8OxKEihd7wG/0hr8kKpZgqFI/j8rdjO8s PZEDDC+OX8aYZy9u/XHXnCqdWx0UypE= X-Google-Smtp-Source: ACHHUZ5j4aR8F78dxip8RbVwwtN7tQSfuK9BhguCjo7+vHSO3ZVYBRQZ6EYSIpVmjSUrhNK8nWPG//nOytk= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:902:c204:b0:1a6:b4cf:f6c0 with SMTP id 4-20020a170902c20400b001a6b4cff6c0mr375741pll.4.1685754683772; Fri, 02 Jun 2023 18:11:23 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 2 Jun 2023 18:10:58 -0700 In-Reply-To: <20230603011058.1038821-1-seanjc@google.com> Mime-Version: 1.0 References: <20230603011058.1038821-1-seanjc@google.com> X-Mailer: git-send-email 2.41.0.rc2.161.g9c6817b8e7-goog Message-ID: <20230603011058.1038821-13-seanjc@google.com> Subject: [PATCH v7 12/12] KVM: x86/cpuid: Add AMD CPUID ExtPerfMonAndDbg leaf 0x80000022 From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Like Xu , Like Xu , Jim Mattson , Sandipan Das Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Like Xu CPUID leaf 0x80000022 i.e. ExtPerfMonAndDbg advertises some new performance monitoring features for AMD processors. Bit 0 of EAX indicates support for Performance Monitoring Version 2 (PerfMonV2) features. If found to be set during PMU initialization, the EBX bits of the same CPUID function can be used to determine the number of available PMCs for different PMU types. Expose the relevant bits via KVM_GET_SUPPORTED_CPUID so that guests can make use of the PerfMonV2 features. Co-developed-by: Sandipan Das Signed-off-by: Sandipan Das Signed-off-by: Like Xu Signed-off-by: Sean Christopherson --- arch/x86/kvm/cpuid.c | 28 +++++++++++++++++++++++++++- arch/x86/kvm/svm/svm.c | 4 ++++ 2 files changed, 31 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 61bc71882f07..0e5584f4acd7 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -734,6 +734,10 @@ void kvm_set_cpu_caps(void) F(NULL_SEL_CLR_BASE) | F(AUTOIBRS) | 0 /* PrefetchCtlMsr */ ); =20 + kvm_cpu_cap_init_kvm_defined(CPUID_8000_0022_EAX, + F(PERFMON_V2) + ); + /* * Synthesize "LFENCE is serializing" into the AMD-defined entry in * KVM's supported CPUID if the feature is reported as supported by the @@ -1128,7 +1132,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_ar= ray *array, u32 function) entry->edx =3D 0; break; case 0x80000000: - entry->eax =3D min(entry->eax, 0x80000021); + entry->eax =3D min(entry->eax, 0x80000022); /* * Serializing LFENCE is reported in a multitude of ways, and * NullSegClearsBase is not reported in CPUID on Zen2; help @@ -1233,6 +1237,28 @@ static inline int __do_cpuid_func(struct kvm_cpuid_a= rray *array, u32 function) entry->ebx =3D entry->ecx =3D entry->edx =3D 0; cpuid_entry_override(entry, CPUID_8000_0021_EAX); break; + /* AMD Extended Performance Monitoring and Debug */ + case 0x80000022: { + union cpuid_0x80000022_ebx ebx; + + entry->ecx =3D entry->edx =3D 0; + if (!enable_pmu || !kvm_cpu_cap_has(X86_FEATURE_PERFMON_V2)) { + entry->eax =3D entry->ebx; + break; + } + + cpuid_entry_override(entry, CPUID_8000_0022_EAX); + + if (kvm_cpu_cap_has(X86_FEATURE_PERFMON_V2)) + ebx.split.num_core_pmc =3D kvm_pmu_cap.num_counters_gp; + else if (kvm_cpu_cap_has(X86_FEATURE_PERFCTR_CORE)) + ebx.split.num_core_pmc =3D AMD64_NUM_COUNTERS_CORE; + else + ebx.split.num_core_pmc =3D AMD64_NUM_COUNTERS; + + entry->ebx =3D ebx.full; + break; + } /*Add support for Centaur's CPUID instruction*/ case 0xC0000000: /*Just support up to 0xC0000004 now*/ diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index d9669e3cc00a..ff48cdea1fbf 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -5036,6 +5036,10 @@ static __init void svm_set_cpu_caps(void) kvm_pmu_cap.num_counters_gp); else kvm_cpu_cap_check_and_set(X86_FEATURE_PERFCTR_CORE); + + if (kvm_pmu_cap.version !=3D 2 || + !kvm_cpu_cap_has(X86_FEATURE_PERFCTR_CORE)) + kvm_cpu_cap_clear(X86_FEATURE_PERFMON_V2); } =20 /* CPUID 0x8000001F (SME/SEV features) */ --=20 2.41.0.rc2.161.g9c6817b8e7-goog