All of lore.kernel.org
 help / color / mirror / Atom feed
From: Luwei Kang <luwei.kang@intel.com>
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 <luwei.kang@intel.com>
Subject: [PATCH v6 11/11] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest
Date: Tue, 20 Mar 2018 19:21:58 +0800	[thread overview]
Message-ID: <1521544918-31084-12-git-send-email-luwei.kang@intel.com> (raw)
In-Reply-To: <1521544918-31084-1-git-send-email-luwei.kang@intel.com>

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 <luwei.kang@intel.com>
---
 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 27185da..77a28f3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3763,7 +3763,8 @@ 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));
@@ -7869,6 +7870,12 @@ 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

  parent reply	other threads:[~2018-03-21  1:11 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-20 11:21 [PATCH v6 00/11] Intel Processor Trace virtualization enabling Luwei Kang
2018-03-20 11:21 ` [PATCH v6 01/11] perf/x86/intel/pt: Move Intel-PT MSR bit definitions to a public header Luwei Kang
2018-04-30 13:57   ` Peter Zijlstra
2018-05-02  7:41     ` Kang, Luwei
2018-03-20 11:21 ` [PATCH v6 02/11] perf/x86/intel/pt: Change pt_cap_get() to a public function Luwei Kang
2018-04-30 13:59   ` Peter Zijlstra
2018-03-20 11:21 ` [PATCH v6 03/11] perf/x86/intel/pt: Introduce a new function to get the capability of Intel PT Luwei Kang
2018-04-30 14:01   ` Peter Zijlstra
2018-03-20 11:21 ` [PATCH v6 04/11] KVM: x86: Add Intel Processor Trace virtualization mode Luwei Kang
2018-03-20 11:21 ` [PATCH v6 05/11] KVM: x86: Add Intel Processor Trace cpuid emulation Luwei Kang
2018-03-20 11:21 ` [PATCH v6 06/11] KVM: x86: Add Intel processor trace context for each vcpu Luwei Kang
2018-03-20 11:21 ` [PATCH v6 07/11] KVM: x86: Implement Intel Processor Trace context switch Luwei Kang
2018-03-20 11:21 ` [PATCH v6 08/11] KVM: x86: Introduce a function to initialize the PT configuration Luwei Kang
2018-03-20 11:21 ` [PATCH v6 09/11] KVM: x86: Implement Intel Processor Trace MSRs read/write Luwei Kang
2018-03-20 11:21 ` [PATCH v6 10/11] KVM: x86: Set intercept for Intel PT MSRs Luwei Kang
2018-03-20 11:21 ` Luwei Kang [this message]
2018-04-30 13:17 ` [PATCH v6 00/11] Intel Processor Trace virtualization enabling Paolo Bonzini

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1521544918-31084-12-git-send-email-luwei.kang@intel.com \
    --to=luwei.kang@intel.com \
    --cc=hpa@zytor.com \
    --cc=joro@8bytes.org \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=rkrcmar@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.