From nobody Fri Sep 19 12:03:11 2025 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 5DED5C433F5 for ; Tue, 17 May 2022 15:42:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350606AbiEQPms (ORCPT ); Tue, 17 May 2022 11:42:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350485AbiEQPlh (ORCPT ); Tue, 17 May 2022 11:41:37 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 892FF41300; Tue, 17 May 2022 08:41:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652802096; x=1684338096; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=JCcEV/p27oXy+SVtfRE3Ssp6Itei+XlgrjZFi0lR+dc=; b=FbyuM+PYJoEw9nm+pXAEB/ZrvJ9g+o+5tDH2F+GtQklvVLNfDpcQS0Vt SwLgdOFsyDgO1BDfsfCTuBO6s5y3cj+JkVi503swpxwpdJg6xxRvb7v4i Y4OOIVArclOoh5oWE6lN0qH9C4Fm2gV/PN8BH+1TOXP4qKIDfHQ9Q74fD sFFwNCdOC0alEObdA4Jd9I/ue5bd92MKt21R7t3RvdOyPBUKJPPZBiyb4 7u4QgBB9HvC6hEnCzjE4yaSr40XcY4TFCiYKO+yWnEH0kercbfRVdXs+g E+y8h5ee7ONn2LLmJzFK2DRZR4oeSoAi7lGlwh1ohjfHQJKHEDQh3p04i w==; X-IronPort-AV: E=McAfee;i="6400,9594,10350"; a="357632100" X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="357632100" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 May 2022 08:41:33 -0700 X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="626533568" Received: from embargo.jf.intel.com ([10.165.9.183]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 May 2022 08:41:33 -0700 From: Yang Weijiang To: pbonzini@redhat.com, jmattson@google.com, seanjc@google.com, like.xu.linux@gmail.com, vkuznets@redhat.com, kan.liang@linux.intel.com, wei.w.wang@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Yang Weijiang Subject: [PATCH v12 05/16] KVM: x86: Add Arch LBR MSRs to msrs_to_save_all list Date: Tue, 17 May 2022 11:40:49 -0400 Message-Id: <20220517154100.29983-6-weijiang.yang@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220517154100.29983-1-weijiang.yang@intel.com> References: <20220517154100.29983-1-weijiang.yang@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Arch LBR MSR_ARCH_LBR_DEPTH and MSR_ARCH_LBR_CTL are queried by userspace application before it wants to {save|restore} the Arch LBR data. Other LBR related data MSRs are omitted here intentionally due to lengthy list(32*3). Userspace can still use KVM_{GET|SET}_MSRS to access them if necessary. Suggested-by: Jim Mattson Signed-off-by: Yang Weijiang Reviewed-by: Jim Mattson --- arch/x86/kvm/x86.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 247c58f5c8af..93b027aed2f3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1458,6 +1458,7 @@ static const u32 msrs_to_save_all[] =3D { MSR_F15H_PERF_CTR3, MSR_F15H_PERF_CTR4, MSR_F15H_PERF_CTR5, MSR_IA32_XFD, MSR_IA32_XFD_ERR, MSR_IA32_XSS, + MSR_ARCH_LBR_CTL, MSR_ARCH_LBR_DEPTH, }; =20 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)]; @@ -6741,6 +6742,11 @@ static void kvm_init_msr_list(void) if (!supported_xss) continue; break; + case MSR_ARCH_LBR_DEPTH: + case MSR_ARCH_LBR_CTL: + if (!kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR)) + continue; + break; default: break; } --=20 2.27.0