From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752404AbeCEB55 (ORCPT ); Sun, 4 Mar 2018 20:57:57 -0500 Received: from mga14.intel.com ([192.55.52.115]:39574 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932653AbeCEB5W (ORCPT ); Sun, 4 Mar 2018 20:57:22 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,425,1515484800"; d="scan'208";a="21986126" From: Luwei Kang To: kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, linux-kernel@vger.kernel.org, joro@8bytes.org, Luwei Kang Subject: [PATCH v5 11/11] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest Date: Sun, 4 Mar 2018 20:07:21 +0800 Message-Id: <1520165241-15819-12-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1520165241-15819-1-git-send-email-luwei.kang@intel.com> References: <1520165241-15819-1-git-send-email-luwei.kang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, Intel Processor Trace do not support tracing in L1 guest VMX operation(IA32_VMX_MISC[bit 14] is 0). As mentioned in SDM, on these type of processors, execution of the VMXON instruction will clears IA32_RTIT_CTL.TraceEn and any attempt to write IA32_RTIT_CTL causes a general-protection exception (#GP). Signed-off-by: Luwei Kang --- arch/x86/kvm/vmx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 0a55772..a1ec71d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3710,7 +3710,8 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) clear_atomic_switch_msr(vmx, MSR_IA32_XSS); break; case MSR_IA32_RTIT_CTL: - if (!vmx_pt_supported() || vmx_rtit_ctl_check(vcpu, data)) + if (!vmx_pt_supported() || vmx_rtit_ctl_check(vcpu, data) || + vmx->nested.vmxon) return 1; vmcs_write64(GUEST_IA32_RTIT_CTL, data); vmx->pt_desc.guest.ctl = data; @@ -7783,6 +7784,12 @@ static int handle_vmon(struct kvm_vcpu *vcpu) if (ret) return ret; + if (pt_mode == PT_MODE_HOST_GUEST) { + vmx->pt_desc.guest.ctl = 0; + vmcs_write64(GUEST_IA32_RTIT_CTL, 0); + pt_set_intercept_for_msr(vmx, 1); + } + nested_vmx_succeed(vcpu); return kvm_skip_emulated_instruction(vcpu); } -- 1.8.3.1