From nobody Fri Dec 19 19:15:45 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 BB6D0C433EF for ; Wed, 16 Feb 2022 10:27:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232938AbiBPK1R (ORCPT ); Wed, 16 Feb 2022 05:27:17 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:49746 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232842AbiBPK1D (ORCPT ); Wed, 16 Feb 2022 05:27:03 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 347222069B1; Wed, 16 Feb 2022 02:26:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645007212; x=1676543212; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=d0Zmk6swUVx+2GCwICJDlgaWcmwvVx77M2E86jr+scg=; b=iC+4rPGtZI1OcyKgiuaUaMOmTHy+WwbjzjpOWeJrSADc3ThCXBV94qGs XXP5YHbZFxS8x0pNQZqkwl3Cf7JdnrcLhgn2o9gTY6EGlkVI3fg2FKUN/ cwS3ux7nmXUasPlxDf6DH6xMyrC2PJyk73tk4IEqJkULXByfiR1lVbDql o/HK/teiHF4LPejG/E8AeXYzCZEiFlHDDEVp0rnnq64dQ0p+eQvTEjwK+ aVLF6iGpTkUltCZ4y91u/zwqQ4jn9KrRwDtBgNx8o3HSMCVNSJovqiRWE xdtKOWmPVDeUZ/QfZvzev2jwgHMvcGP6inf65h4A5sDuIK5AGeNuntY+f A==; X-IronPort-AV: E=McAfee;i="6200,9189,10259"; a="231201154" X-IronPort-AV: E=Sophos;i="5.88,373,1635231600"; d="scan'208";a="231201154" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2022 02:26:51 -0800 X-IronPort-AV: E=Sophos;i="5.88,373,1635231600"; d="scan'208";a="498708567" Received: from embargo.jf.intel.com ([10.165.9.183]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2022 02:26:50 -0800 From: Yang Weijiang To: pbonzini@redhat.com, jmattson@google.com, seanjc@google.com, like.xu.linux@gmail.com, vkuznets@redhat.com, wei.w.wang@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Sean Christopherson , Yang Weijiang Subject: [PATCH v9 01/17] KVM: x86: Report XSS as an MSR to be saved if there are supported features Date: Tue, 15 Feb 2022 16:25:28 -0500 Message-Id: <20220215212544.51666-2-weijiang.yang@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220215212544.51666-1-weijiang.yang@intel.com> References: <20220215212544.51666-1-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" From: Sean Christopherson Add MSR_IA32_XSS to the list of MSRs reported to userspace if supported_xss is non-zero, i.e. KVM supports at least one XSS based feature. Signed-off-by: Sean Christopherson Co-developed-by: Yang Weijiang Signed-off-by: Yang Weijiang --- arch/x86/kvm/x86.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 641044db415d..b82934c13e30 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1390,6 +1390,7 @@ static const u32 msrs_to_save_all[] =3D { MSR_F15H_PERF_CTR0, MSR_F15H_PERF_CTR1, MSR_F15H_PERF_CTR2, MSR_F15H_PERF_CTR3, MSR_F15H_PERF_CTR4, MSR_F15H_PERF_CTR5, MSR_IA32_XFD, MSR_IA32_XFD_ERR, + MSR_IA32_XSS, }; =20 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)]; @@ -6585,6 +6586,10 @@ static void kvm_init_msr_list(void) if (!kvm_cpu_cap_has(X86_FEATURE_XFD)) continue; break; + case MSR_IA32_XSS: + if (!supported_xss) + continue; + break; default: break; } @@ -11481,6 +11486,8 @@ int kvm_arch_hardware_setup(void *opaque) =20 if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) supported_xss =3D 0; + else + supported_xss &=3D host_xss; =20 #define __kvm_cpu_cap_has(UNUSED_, f) kvm_cpu_cap_has(f) cr4_reserved_bits =3D __cr4_reserved_bits(__kvm_cpu_cap_has, UNUSED_); --=20 2.27.0