From nobody Mon Feb 9 14:31:49 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 E7008C7EE37 for ; Wed, 7 Jun 2023 01:02:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240408AbjFGBCW (ORCPT ); Tue, 6 Jun 2023 21:02:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240381AbjFGBCN (ORCPT ); Tue, 6 Jun 2023 21:02:13 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EBE25124 for ; Tue, 6 Jun 2023 18:02:11 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-bad06cc7fb7so10988202276.3 for ; Tue, 06 Jun 2023 18:02:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1686099731; x=1688691731; 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=Ppsx8Ceq66P31QklC+vqilKr6uT5OJgGHpP85vCiA6Y=; b=60F2xJuBCyVXi/iBprpW3GuxweYIVitbrvYdm3N96FsZqqFZ2ro1VTYWQECv2oLH9T CI2gz2e+UlSu7s1pZXNnbwYXsEm+k1euxY3C6yIvCmgmIolJD6TR5bB60JPREl2ol0gP hUNdZCWVahrHPFGvnvx5lSuPCK2zZm/XEuwkEfQ9bE2FTi6Ktk2TQUq6hJD+hEK9ICD1 BpdjfAF91eQb+bXOMKDTyqAtwYsVy7brSn5oVc8QGBuG9yLErI4FpJwMLGo6GaKFT2H7 N6Vk66Ff9rcSaU4QdOi/RBaBpfvf+XkX0h5fR2BbtqVkXmcdT/v9WsRrMgsA53jGf3bp 8hDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686099731; x=1688691731; 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=Ppsx8Ceq66P31QklC+vqilKr6uT5OJgGHpP85vCiA6Y=; b=LoEg/0/WmoyI+Q7LcoG/avyj04GaMwvTEcAFjH20ZUSW6zEiMBPRsdFuOgeDBsgB+a bC35jN5SQq3F3ymJi2Na5ZR8jCxwEmM3xnUJCrSvSt1xolvofPZkJaUlafbi/U9N3FYM 7Y5wmQOCKHH1M9BJCV/798WM7lkmp45A8uexWU4rl8d8d+JZybTcGGbrxSDpQiPkdcjO XwHhs29CmOQSvTOqgeKgXoD685JmSBuf8s3PKe5HKFwr/qd1PQnxcS9AaHfMUCHNv9/q BaaHiU+KkuGh4FmR7w2mo8kQJkONGuoaa32SSf+AD3btGr4iauMygeI8tsHLp6gGY94Q PN+A== X-Gm-Message-State: AC+VfDxARgsxxhk7Zdyu2t3MoilAk0tkBgNPf4AdvJmSsC9tz0zwW3Se fDcvmzI2vDTRXNlbSlBJu6znLj7CIcM= X-Google-Smtp-Source: ACHHUZ5lSKXxJyCIlFQNj+i2NLpdxteCe7UtCpTwxSQ6kftQAsIgDzwiQgT7wsKkC5cGIzPkeFP8vs8gKPI= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a25:50d3:0:b0:bb3:c4c2:5d2a with SMTP id e202-20020a2550d3000000b00bb3c4c25d2amr1201172ybb.7.1686099731265; Tue, 06 Jun 2023 18:02:11 -0700 (PDT) Reply-To: Sean Christopherson Date: Tue, 6 Jun 2023 18:02:03 -0700 In-Reply-To: <20230607010206.1425277-1-seanjc@google.com> Mime-Version: 1.0 References: <20230607010206.1425277-1-seanjc@google.com> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog Message-ID: <20230607010206.1425277-2-seanjc@google.com> Subject: [PATCH 1/4] KVM: x86/pmu: Use enums instead of hardcoded magic for arch event indices From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Aaron Lewis , Like Xu Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add "enum intel_pmu_architectural_events" to replace the magic numbers for the (pseudo-)architectural events, and to give a meaningful name to each event so that new readers don't need psychic powers to understand what the code is doing. Cc: Aaron Lewis Cc: Like Xu Signed-off-by: Sean Christopherson Reviewed-by: Like Xu --- arch/x86/kvm/vmx/pmu_intel.c | 55 ++++++++++++++++++++++++++++-------- 1 file changed, 43 insertions(+), 12 deletions(-) diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index 84be32d9f365..0050d71c9c01 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -22,23 +22,51 @@ =20 #define MSR_PMC_FULL_WIDTH_BIT (MSR_IA32_PMC0 - MSR_IA32_PERFCTR0) =20 +enum intel_pmu_architectural_events { + /* + * The order of the architectural events matters as support for each + * event is enumerated via CPUID using the index of the event. + */ + INTEL_ARCH_CPU_CYCLES, + INTEL_ARCH_INSTRUCTIONS_RETIRED, + INTEL_ARCH_REFERENCE_CYCLES, + INTEL_ARCH_LLC_REFERENCES, + INTEL_ARCH_LLC_MISSES, + INTEL_ARCH_BRANCHES_RETIRED, + INTEL_ARCH_BRANCHES_MISPREDICTED, + + NR_REAL_INTEL_ARCH_EVENTS, + + /* + * Pseudo-architectural event used to implement IA32_FIXED_CTR2, a.k.a. + * TSC reference cycles. The architectural reference cycles event may + * or may not actually use the TSC as the reference, e.g. might use the + * core crystal clock or the bus clock (yeah, "architectural"). + */ + PSEUDO_ARCH_REFERENCE_CYCLES =3D NR_REAL_INTEL_ARCH_EVENTS, + NR_INTEL_ARCH_EVENTS, +}; + static struct { u8 eventsel; u8 unit_mask; } const intel_arch_events[] =3D { - [0] =3D { 0x3c, 0x00 }, - [1] =3D { 0xc0, 0x00 }, - [2] =3D { 0x3c, 0x01 }, - [3] =3D { 0x2e, 0x4f }, - [4] =3D { 0x2e, 0x41 }, - [5] =3D { 0xc4, 0x00 }, - [6] =3D { 0xc5, 0x00 }, - /* The above index must match CPUID 0x0A.EBX bit vector */ - [7] =3D { 0x00, 0x03 }, + [INTEL_ARCH_CPU_CYCLES] =3D { 0x3c, 0x00 }, + [INTEL_ARCH_INSTRUCTIONS_RETIRED] =3D { 0xc0, 0x00 }, + [INTEL_ARCH_REFERENCE_CYCLES] =3D { 0x3c, 0x01 }, + [INTEL_ARCH_LLC_REFERENCES] =3D { 0x2e, 0x4f }, + [INTEL_ARCH_LLC_MISSES] =3D { 0x2e, 0x41 }, + [INTEL_ARCH_BRANCHES_RETIRED] =3D { 0xc4, 0x00 }, + [INTEL_ARCH_BRANCHES_MISPREDICTED] =3D { 0xc5, 0x00 }, + [PSEUDO_ARCH_REFERENCE_CYCLES] =3D { 0x00, 0x03 }, }; =20 /* mapping between fixed pmc index and intel_arch_events array */ -static int fixed_pmc_events[] =3D {1, 0, 7}; +static int fixed_pmc_events[] =3D { + [0] =3D INTEL_ARCH_INSTRUCTIONS_RETIRED, + [1] =3D INTEL_ARCH_CPU_CYCLES, + [2] =3D PSEUDO_ARCH_REFERENCE_CYCLES, +}; =20 static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data) { @@ -92,13 +120,16 @@ static bool intel_hw_event_available(struct kvm_pmc *p= mc) u8 unit_mask =3D (pmc->eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8; int i; =20 - for (i =3D 0; i < ARRAY_SIZE(intel_arch_events); i++) { + BUILD_BUG_ON(ARRAY_SIZE(intel_arch_events) !=3D NR_INTEL_ARCH_EVENTS); + + for (i =3D 0; i < NR_INTEL_ARCH_EVENTS; i++) { if (intel_arch_events[i].eventsel !=3D event_select || intel_arch_events[i].unit_mask !=3D unit_mask) continue; =20 /* disable event that reported as not present by cpuid */ - if ((i < 7) && !(pmu->available_event_types & (1 << i))) + if ((i < PSEUDO_ARCH_REFERENCE_CYCLES) && + !(pmu->available_event_types & (1 << i))) return false; =20 break; --=20 2.41.0.162.gfafddb0af9-goog