From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752582AbdK1KJp (ORCPT ); Tue, 28 Nov 2017 05:09:45 -0500 Received: from mga01.intel.com ([192.55.52.88]:59069 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752550AbdK1KJk (ORCPT ); Tue, 28 Nov 2017 05:09:40 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,467,1505804400"; d="scan'208";a="7939994" 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 v3 8/9] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest Date: Tue, 28 Nov 2017 04:24:01 +0800 Message-Id: <1511814242-12949-9-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1511814242-12949-1-git-send-email-luwei.kang@intel.com> References: <1511814242-12949-1-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 xception (#GP). Signed-off-by: Luwei Kang --- arch/x86/kvm/vmx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index e002a44..b4ad8fc 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7573,6 +7573,12 @@ static int handle_vmon(struct kvm_vcpu *vcpu) if (ret) return ret; + if (pt_mode == PT_MODE_HOST_GUEST) { + vmx->pt_desc.guest.ctl &= ~RTIT_CTL_TRACEEN; + pt_disable_intercept_for_msr(FALSE); + vmcs_write64(GUEST_IA32_RTIT_CTL, vmx->pt_desc.guest.ctl); + } + nested_vmx_succeed(vcpu); return kvm_skip_emulated_instruction(vcpu); } -- 1.8.3.1