From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=DATE_IN_PAST_12_24, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B07C5C43381 for ; Tue, 19 Mar 2019 08:12:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8AFA52183F for ; Tue, 19 Mar 2019 08:12:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727648AbfCSIMQ (ORCPT ); Tue, 19 Mar 2019 04:12:16 -0400 Received: from mga07.intel.com ([134.134.136.100]:44015 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727590AbfCSIMO (ORCPT ); Tue, 19 Mar 2019 04:12:14 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Mar 2019 01:12:13 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,497,1544515200"; d="scan'208";a="308418041" Received: from local-michael-cet-test.sh.intel.com ([10.239.159.128]) by orsmga005.jf.intel.com with ESMTP; 19 Mar 2019 01:12:10 -0700 From: Yang Weijiang To: pbonzini@redhat.com, kvm@vger.kernel.org, mst@redhat.com, rkrcmar@redhat.com, jmattson@google.com, linux-kernel@vger.kernel.org, yu-cheng.yu@intel.com Cc: Yang Weijiang , Zhang Yi Z Subject: [RFC PATCH v4 4/8] KVM:VMX: Pass through host CET related MSRs to Guest. Date: Mon, 18 Mar 2019 23:03:47 +0800 Message-Id: <20190318150351.15550-5-weijiang.yang@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190318150351.15550-1-weijiang.yang@intel.com> References: <20190318150351.15550-1-weijiang.yang@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The CET runtime settings, i.e., CET state control bits(IA32_U_CET/ IA32_S_CET), CET SSP(IA32_PL3_SSP/IA32_PL0_SSP) and SSP table address (IA32_INTERRUPT_SSP_TABLE_ADDR) are task/thread specific, therefore, OS needs to save/restore the states properly during context switch, e.g., task/thread switching, interrupt/exception handling, it uses xsaves/xrstors to achieve that. The difference between VMCS CET area fields and xsave CET area, is that the former is for state retention during Guest/Host context switch while the latter is for state retention during OS execution. Linux currently doesn't support CPL1 and CPL2, so SSPs for these level are skipped here. Signed-off-by: Zhang Yi Z Signed-off-by: Yang Weijiang --- arch/x86/kvm/vmx.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 53cef5a3db96..28b8ac027bd7 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -11774,6 +11774,7 @@ static void nested_vmx_entry_exit_ctls_update(struct kvm_vcpu *vcpu) static void vmx_cpuid_update(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); + unsigned long *msr_bitmap; if (cpu_has_secondary_exec_ctrls()) { vmx_compute_secondary_exec_control(vmx); @@ -11791,6 +11792,18 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu) nested_vmx_cr_fixed1_bits_update(vcpu); nested_vmx_entry_exit_ctls_update(vcpu); } + + msr_bitmap = vmx->vmcs01.msr_bitmap; + + if (guest_cpuid_has(vcpu, X86_FEATURE_SHSTK) || + guest_cpuid_has(vcpu, X86_FEATURE_IBT)) { + vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_U_CET, MSR_TYPE_RW); + vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_S_CET, MSR_TYPE_RW); + vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_INT_SSP_TAB, MSR_TYPE_RW); + vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_PL0_SSP, MSR_TYPE_RW); + vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_PL3_SSP, MSR_TYPE_RW); + } + } static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry) -- 2.17.1