From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luwei Kang Subject: [PATCH v13 12/12] KVM: x86: Disable Intel PT when VMXON in L1 guest Date: Wed, 24 Oct 2018 16:05:16 +0800 Message-ID: <1540368316-12998-13-git-send-email-luwei.kang@intel.com> References: <1540368316-12998-1-git-send-email-luwei.kang@intel.com> Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, pbonzini@redhat.com, rkrcmar@redhat.com, joro@8bytes.org, songliubraving@fb.com, peterz@infradead.org, alexander.shishkin@linux.intel.com, kstewart@linuxfoundation.org, gregkh@linuxfoundation.org, thomas.lendacky@amd.com, konrad.wilk@oracle.com, mattst88@gmail.com, Janakarajan.Natarajan@amd.com, dwmw@amazon.co.uk, jpoimboe@redhat.com, marcorr@google.com, ubizjak@gmail.com, sean.j.christopherson@intel.com, jmattson@google.com, linux-kernel@vger.kernel.org, Luwei Kang To: kvm@vger.kernel.org, x86@kernel.org Return-path: In-Reply-To: <1540368316-12998-1-git-send-email-luwei.kang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.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 | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index ed247dd..5001049 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4556,7 +4556,8 @@ 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)); @@ -8760,6 +8761,11 @@ 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; + pt_set_intercept_for_msr(vmx, 1); + } + return nested_vmx_succeed(vcpu); } -- 1.8.3.1