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 24879C433EF for ; Tue, 17 May 2022 15:43:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350376AbiEQPnH (ORCPT ); Tue, 17 May 2022 11:43:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350511AbiEQPlj (ORCPT ); Tue, 17 May 2022 11:41:39 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D763240E7C; Tue, 17 May 2022 08:41:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652802098; x=1684338098; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=xR/611xpvRKGSSt6US+B7XzEs4L6LdH7uwkJelvOZ/Q=; b=UInopzvSS1CiRRwyNSm9BHswGGOOMbd63hkSYI7ZaYv/ggvXsDooURfQ 9zJK8S5RBW5thESsr1WHk8v4ccaeldr9Ds+JgkEi1QyiuRAD/HqCOV8dN ybS0qoDH7YYG5gsVAtBQ9amIxg6sARft4CJz/rDVUhBas0T9rluJ72tCg uagzuDXmj0PItycrppg8mQ/nDVm+ENgbra3sNBWyh2r7ljWMmNmSJOGzp xM347j10gvZTozKluMShU74QebsFwWCc+UMjVWIuveBGwyRLkb64qhIEx 8wb89FXSrAOPKBS/twetRw69ANunAOXkOsZsA/QkB3B+i9a96xDdT7bYV A==; X-IronPort-AV: E=McAfee;i="6400,9594,10350"; a="357632112" X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="357632112" 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 08:41:35 -0700 X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="626533596" 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 08:41:35 -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: Like Xu , Yang Weijiang Subject: [PATCH v12 11/16] KVM: x86: Add XSAVE Support for Architectural LBR Date: Tue, 17 May 2022 11:40:55 -0400 Message-Id: <20220517154100.29983-12-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" 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 7238628acb90..1b7194b9b6bc 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7546,6 +7546,10 @@ static __init void vmx_set_cpu_caps(void) kvm_cpu_cap_check_and_set(X86_FEATURE_DS); kvm_cpu_cap_check_and_set(X86_FEATURE_DTES64); } + 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 90b3129a2fbe..637ecd19c646 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -224,7 +224,7 @@ 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