From patchwork Wed May 12 08:44:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Like Xu X-Patchwork-Id: 12253089 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68F06C433ED for ; Wed, 12 May 2021 08:46:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2854F613C3 for ; Wed, 12 May 2021 08:46:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231160AbhELIrM (ORCPT ); Wed, 12 May 2021 04:47:12 -0400 Received: from mga17.intel.com ([192.55.52.151]:10038 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230498AbhELIq5 (ORCPT ); Wed, 12 May 2021 04:46:57 -0400 IronPort-SDR: SJfQ0DHc2GxqxaCGnpqoSYHE9pYkS/u3t5PBMEh5+Ep5weZot+zbDI1254xpM5RlqY8BCsXJsu lo8CxCEz0HZg== X-IronPort-AV: E=McAfee;i="6200,9189,9981"; a="179918887" X-IronPort-AV: E=Sophos;i="5.82,293,1613462400"; d="scan'208";a="179918887" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 May 2021 01:45:49 -0700 IronPort-SDR: H6o6VzF/Tuz6GSKhXx19UWOhNqXTidR80XhT9ufzH8IdO2tDOsbvOqxs6/FZJJWYokFcMhNt9e 9lVbj4V+hx5Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.82,293,1613462400"; d="scan'208";a="392636420" Received: from clx-ap-likexu.sh.intel.com ([10.239.48.108]) by orsmga006.jf.intel.com with ESMTP; 12 May 2021 01:45:45 -0700 From: Like Xu To: Paolo Bonzini , peterz@infradead.org Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , weijiang.yang@intel.com, eranian@google.com, wei.w.wang@intel.com, kvm@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, Like Xu , Alexander Shishkin , Andi Kleen Subject: [PATCH v3 5/5] KVM: x86/pmu: Expose PEBS-via-PT in the KVM supported capabilities Date: Wed, 12 May 2021 16:44:46 +0800 Message-Id: <20210512084446.342526-6-like.xu@linux.intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512084446.342526-1-like.xu@linux.intel.com> References: <20210512084446.342526-1-like.xu@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The hypervisor userspace can dis/enable it via the MSR-based feature "MSR_IA32_PERF_CAPABILITIES [bit 16]". If guest also has basic PT support, it can output the PEBS records to the PT buffer. Cc: Alexander Shishkin Cc: Andi Kleen Signed-off-by: Like Xu --- arch/x86/kvm/vmx/capabilities.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h index fd8c9822db9e..e04b50174dd5 100644 --- a/arch/x86/kvm/vmx/capabilities.h +++ b/arch/x86/kvm/vmx/capabilities.h @@ -398,8 +398,11 @@ static inline u64 vmx_get_perf_capabilities(void) perf_cap |= host_perf_cap & PMU_CAP_LBR_FMT; - if (vmx_pebs_supported()) + if (vmx_pebs_supported()) { perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK; + if (vmx_pt_mode_is_host_guest()) + perf_cap |= host_perf_cap & PERF_CAP_PEBS_OUTPUT_PT; + } return perf_cap; }