linux-kernel - [PATCH 5/9] KVM: x86: implement intel processor trace virtualization callbacks

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Date:   Mon, 16 Oct 2017 20:13:20 +0800
From:   Luwei Kang <luwei.kang@...el.com>
To:     kvm@...r.kernel.org
Cc:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Luwei Kang <luwei.kang@...el.com>
Subject: [PATCH 5/9] KVM: x86: implement intel processor trace virtualization callbacks

From: Chao Peng <chao.p.peng@...ux.intel.com>

Implement Intel processor trace virtualization callbacks to
suppress host event in guest only mode.

Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@...el.com>
---
 arch/x86/kvm/vmx.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index f0cae7c..28d255d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2114,6 +2114,21 @@ static unsigned long segment_base(u16 selector)
 }
 #endif
 
+static enum pt_mode pt_mode_get(void)
+{
+	return pt_mode;
+}
+
+static bool pt_pmi(void)
+{
+	return true;
+}
+
+static struct pt_virt_ops pt_virt_ops = {
+	.get_mode = pt_mode_get,
+	.pmi = pt_pmi,
+};
+
 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -6945,6 +6960,9 @@ 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_GUEST)
+		pt_register_virt_ops(&pt_virt_ops);
+
 	return alloc_kvm_area();
 
 out:
@@ -6961,6 +6979,9 @@ static __exit void hardware_unsetup(void)
 	for (i = 0; i < VMX_BITMAP_NR; i++)
 		free_page((unsigned long)vmx_bitmap[i]);
 
+	if (pt_mode == PT_MODE_GUEST)
+		pt_unregister_virt_ops();
+
 	free_kvm_area();
 }
 
-- 
1.8.3.1