From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752194AbeECKPh (ORCPT ); Thu, 3 May 2018 06:15:37 -0400 Received: from mga03.intel.com ([134.134.136.65]:44408 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752161AbeECKP1 (ORCPT ); Thu, 3 May 2018 06:15:27 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,358,1520924400"; d="scan'208";a="38109909" 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, peterz@infradead.org, chao.p.peng@linux.intel.com, Luwei Kang Subject: [PATCH v7 13/13] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest Date: Thu, 3 May 2018 20:08:43 +0800 Message-Id: <1525349323-9938-14-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1525349323-9938-1-git-send-email-luwei.kang@intel.com> References: <1525349323-9938-1-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 c125fb1..1e800d0 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3952,7 +3952,8 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) break; case MSR_IA32_RTIT_CTL: if ((pt_mode != PT_MODE_HOST_GUEST) || - vmx_rtit_ctl_check(vcpu, data)) + vmx_rtit_ctl_check(vcpu, data) || + vmx->nested.vmxon) return 1; vmcs_write64(GUEST_IA32_RTIT_CTL, data); pt_set_intercept_for_msr(vmx, !(data & RTIT_CTL_TRACEEN)); @@ -8029,6 +8030,12 @@ 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