From nobody Fri Dec 19 20:35:46 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 A2B9CC433EF for ; Wed, 16 Feb 2022 10:27:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232909AbiBPK1c (ORCPT ); Wed, 16 Feb 2022 05:27:32 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:49912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232854AbiBPK1F (ORCPT ); Wed, 16 Feb 2022 05:27:05 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A5190211473; Wed, 16 Feb 2022 02:26:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645007213; x=1676543213; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=k2Nxa2C4YA5UAu283lDxz/PEeCmvX/9GiIGDhCFUjIU=; b=eASNzpeLZIHGZC9jk3o2IOPGH8GLPUB814GUUr838w80GpDTORImqiBQ ZKiphSWW1hB1zP+qC8ay0xaD39ggpVFpSj0yhNPl5SRGM8ZoCVqASIOQ0 OGuBAn0bFEUUugFsNuPLNvKQ7ztj/YkfaPPdYNwWN9K1zAKhuSH0jWXtb zZK6au/iuBhHCHDYf+wpM1CYeugFVqq90IMWIIXZpI/dRrG7XQtrFtoAf +UpcoCXq97y6iP8GP3+REKOD4GHZWq1gbdDUyy8wd34zL3/MGa2XXC1kO 5SBi/EF3Fom+q1PyFWmewR7YVQ0+n+/iNG+AGXy6jtwQe1B8MR/wtLOY9 A==; X-IronPort-AV: E=McAfee;i="6200,9189,10259"; a="231201163" X-IronPort-AV: E=Sophos;i="5.88,373,1635231600"; d="scan'208";a="231201163" 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="498708609" 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: Like Xu , Yang Weijiang Subject: [PATCH v9 11/17] KVM: x86: Add XSAVE Support for Architectural LBR Date: Tue, 15 Feb 2022 16:25:38 -0500 Message-Id: <20220215212544.51666-12-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: Like Xu On processors supporting XSAVES and XRSTORS, Architectural LBR XSAVE support is enumerated from CPUID.(EAX=3D0DH, ECX=3D1):ECX[bit 15]. The detailed sub-leaf for Arch LBR is enumerated in CPUID.(0DH, 0FH). XSAVES provides a faster means than RDMSR for guest to read all LBRs. When guest IA32_XSS[bit 15] is set, the Arch LBR state can be saved using XSAVES and restored by XRSTORS with the appropriate RFBM. Signed-off-by: Like Xu Signed-off-by: Yang Weijiang --- arch/x86/kvm/vmx/vmx.c | 4 ++++ arch/x86/kvm/x86.c | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index da2a16c0b8d1..38c7d9622bae 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7422,6 +7422,10 @@ static __init void vmx_set_cpu_caps(void) kvm_cpu_cap_clear(X86_FEATURE_INVPCID); if (vmx_pt_mode_is_host_guest()) kvm_cpu_cap_check_and_set(X86_FEATURE_INTEL_PT); + if (!cpu_has_vmx_arch_lbr()) { + kvm_cpu_cap_clear(X86_FEATURE_ARCH_LBR); + supported_xss &=3D ~XFEATURE_MASK_LBR; + } =20 if (!enable_sgx) { kvm_cpu_cap_clear(X86_FEATURE_SGX); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index fb1a62eedd86..64de3ed2cd74 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -223,7 +223,7 @@ static struct kvm_user_return_msrs __percpu *user_retur= n_msrs; | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \ | XFEATURE_MASK_PKRU | XFEATURE_MASK_XTILE) =20 -#define KVM_SUPPORTED_XSS 0 +#define KVM_SUPPORTED_XSS XFEATURE_MASK_LBR =20 u64 __read_mostly host_efer; EXPORT_SYMBOL_GPL(host_efer); --=20 2.27.0