From patchwork Fri Dec 17 15:29:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jing Liu X-Patchwork-Id: 12685131 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 7D010C433F5 for ; Fri, 17 Dec 2021 15:31:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238657AbhLQPbD (ORCPT ); Fri, 17 Dec 2021 10:31:03 -0500 Received: from mga03.intel.com ([134.134.136.65]:10848 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238239AbhLQPaI (ORCPT ); Fri, 17 Dec 2021 10:30:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1639755008; x=1671291008; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2nS5cBvFGjvxlgG+SqL2JDRrtHBJKVl2zUPt7R6ZOgY=; b=VM25fRrKDPy3fX8CWec1u1UIlv6MYVCchtjvzpU65gCk7JF7uHASe1bM qTfldoIYpCtpQ222K9VOtNBgcuVQl1lue/E48tloTjHbLwYdvx3oN2mkL POiFic6c3CGpOv2MzNNSQZfCEuxaZ7HV/M0Z0nU5fuMhWYFYhm5EuhGPG jvuKznIZDEolecOw9DC5R8yzw603hgwl7zFyOC8rh2rh9yohoeEyxOvoG YXCfx3Ioly69Yg7AURMaxsRjJAO5QFWW1f5pRez8J+Ma9kQh+fL2PenxE vrbokC4wCMVD8fWq1apkZxMMPh+VgQRxsNAq+VyLrrXVsM2lw2S/powdh w==; X-IronPort-AV: E=McAfee;i="6200,9189,10200"; a="239723458" X-IronPort-AV: E=Sophos;i="5.88,213,1635231600"; d="scan'208";a="239723458" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Dec 2021 07:30:05 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,213,1635231600"; d="scan'208";a="615588443" Received: from 984fee00a228.jf.intel.com ([10.165.56.59]) by orsmga004.jf.intel.com with ESMTP; 17 Dec 2021 07:30:05 -0800 From: Jing Liu To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, pbonzini@redhat.com Cc: seanjc@google.com, jun.nakajima@intel.com, kevin.tian@intel.com, jing2.liu@linux.intel.com, jing2.liu@intel.com, guang.zeng@intel.com, wei.w.wang@intel.com, yang.zhong@intel.com Subject: [PATCH v2 14/23] kvm: x86: Emulate IA32_XFD_ERR for guest Date: Fri, 17 Dec 2021 07:29:54 -0800 Message-Id: <20211217153003.1719189-15-jing2.liu@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211217153003.1719189-1-jing2.liu@intel.com> References: <20211217153003.1719189-1-jing2.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Emulate read/write to IA32_XFD_ERR MSR. Only the saved value in the guest_fpu container is touched in the emulation handler. Actual MSR update is handled right before entering the guest (with preemption disabled) Signed-off-by: Zeng Guang Signed-off-by: Wei Wang Signed-off-by: Jing Liu --- arch/x86/kvm/x86.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e528085030b3..15b093c58b3d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1358,7 +1358,7 @@ static const u32 msrs_to_save_all[] = { MSR_F15H_PERF_CTL3, MSR_F15H_PERF_CTL4, MSR_F15H_PERF_CTL5, 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, MSR_IA32_XFD_ERR, }; static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)]; @@ -3681,6 +3681,17 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) fpu_update_guest_xfd(&vcpu->arch.guest_fpu, data); break; + case MSR_IA32_XFD_ERR: + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_XFD)) + return 1; + + if (data & ~(XFEATURE_MASK_USER_DYNAMIC & + vcpu->arch.guest_supported_xcr0)) + return 1; + + vcpu->arch.guest_fpu.xfd_err = data; + break; #endif default: if (kvm_pmu_is_valid_msr(vcpu, msr)) @@ -4010,6 +4021,13 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) msr_info->data = vcpu->arch.guest_fpu.fpstate->xfd; break; + case MSR_IA32_XFD_ERR: + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_XFD)) + return 1; + + msr_info->data = vcpu->arch.guest_fpu.xfd_err; + break; #endif default: if (kvm_pmu_is_valid_msr(vcpu, msr_info->index)) @@ -6445,6 +6463,7 @@ static void kvm_init_msr_list(void) continue; break; case MSR_IA32_XFD: + case MSR_IA32_XFD_ERR: if (!kvm_cpu_cap_has(X86_FEATURE_XFD)) continue; break;