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From:   Luwei Kang <luwei.kang@intel.com>
To:     kvm@vger.kernel.org
Cc:     pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de,
        mingo@redhat.com, hpa@zytor.com, x86@kernel.org,
        linux-kernel@vger.kernel.org,
        Chao Peng <chao.p.peng@linux.intel.com>,
        Luwei Kang <luwei.kang@intel.com>
Subject: [patch v2 8/8] KVM: x86: Disable intercept for Intel processor trace MSRs
Date:   Tue, 31 Oct 2017 06:05:17 +0800
Message-Id: <1509401117-15521-9-git-send-email-luwei.kang@intel.com>
In-Reply-To: <1509401117-15521-1-git-send-email-luwei.kang@intel.com>
References: <1509401117-15521-1-git-send-email-luwei.kang@intel.com>
Sender: linux-kernel-owner@vger.kernel.org
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From: Chao Peng <chao.p.peng@linux.intel.com>

Pass through Intel processor trace to guest directly.

Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
---
 arch/x86/kvm/vmx.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 8f61a8d..01447e2 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7029,6 +7029,19 @@ static __init int hardware_setup(void)
 		!cpu_has_vmx_intel_pt() || !cpu_has_vmx_pt_use_gpa())
 		pt_mode = PT_MODE_SYSTEM;
 
+	if (pt_mode == PT_MODE_HOST_GUEST) {
+		u32 i, eax, ebx, ecx, edx;
+
+		cpuid_count(0x14, 1, &eax, &ebx, &ecx, &edx);
+		vmx_disable_intercept_for_msr(MSR_IA32_RTIT_STATUS, false);
+		vmx_disable_intercept_for_msr(MSR_IA32_RTIT_OUTPUT_BASE, false);
+		vmx_disable_intercept_for_msr(MSR_IA32_RTIT_OUTPUT_MASK, false);
+		vmx_disable_intercept_for_msr(MSR_IA32_RTIT_CR3_MATCH, false);
+		for (i = 0; i < (eax & 0x7); i++)
+			vmx_disable_intercept_for_msr(MSR_IA32_RTIT_ADDR0_A + i,
+									false);
+	}
+
 	return alloc_kvm_area();
 
 out:
-- 
1.8.3.1


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