From patchwork Wed Sep 27 03:31:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Mi, Dapeng" X-Patchwork-Id: 13399869 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 D8D6CCE7A8B for ; Wed, 27 Sep 2023 04:04:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229720AbjI0EEB (ORCPT ); Wed, 27 Sep 2023 00:04:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229553AbjI0ECs (ORCPT ); Wed, 27 Sep 2023 00:02:48 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B66A1253E; Tue, 26 Sep 2023 20:24:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695785048; x=1727321048; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=c3qze6Rzf7qt1xJA8WLqp19CuXQe2vCnChT+L9n+VSQ=; b=erHaNw8ZL9BWCrLWDoswzuEVWGjGUBvQoaJ/pJ45/eKkXUiLQxgHwAhV /ewAX35Y8iem7ZViU62sF2H+GblFvHURROcSznVXH3e45c9KxWGsBe0eT 0pswWKVhXGdCHan/Cft6DoEKkt5sdRc0SvaLg64djSvMKn+WsasAaICtT /UcGiMSzofYUnb0zUPSq418u13GP3lzo3YeJkDh3A53dOdmt/OQqAQYgn 3pvYs/dwBePzP/weVvgm6w740Ibs+iS5lgidHnu9NpIhHBr9raDhz3nCr jgv3C7DZTMynQJIwRUWxGjFaEw+s+6t6ARC79ikhX0T336zUD+uxq2hz7 w==; X-IronPort-AV: E=McAfee;i="6600,9927,10845"; a="366780738" X-IronPort-AV: E=Sophos;i="6.03,179,1694761200"; d="scan'208";a="366780738" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2023 20:24:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10845"; a="864636956" X-IronPort-AV: E=Sophos;i="6.03,179,1694761200"; d="scan'208";a="864636956" Received: from dmi-pnp-i7.sh.intel.com ([10.239.159.155]) by fmsmga002.fm.intel.com with ESMTP; 26 Sep 2023 20:24:02 -0700 From: Dapeng Mi To: Sean Christopherson , Paolo Bonzini , Peter Zijlstra , Arnaldo Carvalho de Melo , Kan Liang , Like Xu , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Ian Rogers , Adrian Hunter Cc: kvm@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Zhenyu Wang , Zhang Xiong , Lv Zhiyuan , Yang Weijiang , Dapeng Mi , Dapeng Mi Subject: [Patch v4 02/13] KVM: x86/pmu: Support PMU fixed counter 3 Date: Wed, 27 Sep 2023 11:31:13 +0800 Message-Id: <20230927033124.1226509-3-dapeng1.mi@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230927033124.1226509-1-dapeng1.mi@linux.intel.com> References: <20230927033124.1226509-1-dapeng1.mi@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The TopDown slots event can be enabled on gp counter or fixed counter 3 and it does not differ from other fixed counters in terms of the use of count and sampling modes (except for the hardware logic for event accumulation). According to commit 6017608936c1 ("perf/x86/intel: Add Icelake support"), KVM or any perf in-kernel user needs to reprogram fixed counter 3 via the kernel-defined TopDown slots event for real fixed counter 3 on the host. Co-developed-by: Like Xu Signed-off-by: Like Xu Signed-off-by: Dapeng Mi --- arch/x86/include/asm/kvm_host.h | 2 +- arch/x86/kvm/vmx/pmu_intel.c | 10 ++++++++++ arch/x86/kvm/x86.c | 4 ++-- 3 files changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 17715cb8731d..90ecd3f7a9c3 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -509,7 +509,7 @@ struct kvm_pmc { #define KVM_INTEL_PMC_MAX_GENERIC 8 #define MSR_ARCH_PERFMON_PERFCTR_MAX (MSR_ARCH_PERFMON_PERFCTR0 + KVM_INTEL_PMC_MAX_GENERIC - 1) #define MSR_ARCH_PERFMON_EVENTSEL_MAX (MSR_ARCH_PERFMON_EVENTSEL0 + KVM_INTEL_PMC_MAX_GENERIC - 1) -#define KVM_PMC_MAX_FIXED 3 +#define KVM_PMC_MAX_FIXED 4 #define MSR_ARCH_PERFMON_FIXED_CTR_MAX (MSR_ARCH_PERFMON_FIXED_CTR0 + KVM_PMC_MAX_FIXED - 1) #define KVM_AMD_PMC_MAX_GENERIC 6 struct kvm_pmu { diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index 7322f0c18565..044d61aa63dc 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -45,6 +45,14 @@ enum intel_pmu_architectural_events { * core crystal clock or the bus clock (yeah, "architectural"). */ PSEUDO_ARCH_REFERENCE_CYCLES = NR_REAL_INTEL_ARCH_EVENTS, + /* + * Pseudo-architectural event used to implement IA32_FIXED_CTR3, a.k.a. + * topDown slots. The topdown slots event counts the total number of + * available slots for an unhalted logical processor. The topdwon slots + * event with PERF_METRICS MSR together provides support for topdown + * micro-architecture analysis method. + */ + PSEUDO_ARCH_TOPDOWN_SLOTS, NR_INTEL_ARCH_EVENTS, }; @@ -61,6 +69,7 @@ static struct { [INTEL_ARCH_BRANCHES_MISPREDICTED] = { 0xc5, 0x00 }, [INTEL_ARCH_TOPDOWN_SLOTS] = { 0xa4, 0x01 }, [PSEUDO_ARCH_REFERENCE_CYCLES] = { 0x00, 0x03 }, + [PSEUDO_ARCH_TOPDOWN_SLOTS] = { 0x00, 0x04 }, }; /* mapping between fixed pmc index and intel_arch_events array */ @@ -68,6 +77,7 @@ static int fixed_pmc_events[] = { [0] = INTEL_ARCH_INSTRUCTIONS_RETIRED, [1] = INTEL_ARCH_CPU_CYCLES, [2] = PSEUDO_ARCH_REFERENCE_CYCLES, + [3] = PSEUDO_ARCH_TOPDOWN_SLOTS, }; static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9f18b06bbda6..906af36850fb 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1468,7 +1468,7 @@ static const u32 msrs_to_save_base[] = { static const u32 msrs_to_save_pmu[] = { MSR_ARCH_PERFMON_FIXED_CTR0, MSR_ARCH_PERFMON_FIXED_CTR1, - MSR_ARCH_PERFMON_FIXED_CTR0 + 2, + MSR_ARCH_PERFMON_FIXED_CTR2, MSR_ARCH_PERFMON_FIXED_CTR3, MSR_CORE_PERF_FIXED_CTR_CTRL, MSR_CORE_PERF_GLOBAL_STATUS, MSR_CORE_PERF_GLOBAL_CTRL, MSR_CORE_PERF_GLOBAL_OVF_CTRL, MSR_IA32_PEBS_ENABLE, MSR_IA32_DS_AREA, MSR_PEBS_DATA_CFG, @@ -7196,7 +7196,7 @@ static void kvm_init_msr_lists(void) { unsigned i; - BUILD_BUG_ON_MSG(KVM_PMC_MAX_FIXED != 3, + BUILD_BUG_ON_MSG(KVM_PMC_MAX_FIXED != 4, "Please update the fixed PMCs in msrs_to_save_pmu[]"); num_msrs_to_save = 0;