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Subject[PATCH v13 11/12] KVM: x86: Set intercept for Intel PT MSRs read/write
Date
From: Chao Peng <chao.p.peng@linux.intel.com>

To save performance overhead, disable intercept Intel PT MSRs
read/write when Intel PT is enabled in guest.
MSR_IA32_RTIT_CTL is an exception that will always be intercepted.

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 | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a568d49..ed247dd 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1333,6 +1333,7 @@ static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
static void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu);
static void __always_inline vmx_disable_intercept_for_msr(unsigned long *msr_bitmap,
u32 msr, int type);
+static void pt_set_intercept_for_msr(struct vcpu_vmx *vmx, bool flag);

static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
@@ -4558,6 +4559,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
vmx_rtit_ctl_check(vcpu, data))
return 1;
vmcs_write64(GUEST_IA32_RTIT_CTL, data);
+ pt_set_intercept_for_msr(vmx, !(data & RTIT_CTL_TRACEEN));
vmx->pt_desc.guest.ctl = data;
break;
case MSR_IA32_RTIT_STATUS:
@@ -6414,6 +6416,27 @@ static void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu)
vmx->msr_bitmap_mode = mode;
}

+static void pt_set_intercept_for_msr(struct vcpu_vmx *vmx, bool flag)
+{
+ unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap;
+ u32 i;
+
+ vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_STATUS,
+ MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_OUTPUT_BASE,
+ MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_OUTPUT_MASK,
+ MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(msr_bitmap, MSR_IA32_RTIT_CR3_MATCH,
+ MSR_TYPE_RW, flag);
+ for (i = 0; i < vmx->pt_desc.addr_range; i++) {
+ vmx_set_intercept_for_msr(msr_bitmap,
+ MSR_IA32_RTIT_ADDR0_A + i * 2, MSR_TYPE_RW, flag);
+ vmx_set_intercept_for_msr(msr_bitmap,
+ MSR_IA32_RTIT_ADDR0_B + i * 2, MSR_TYPE_RW, flag);
+ }
+}
+
static bool vmx_get_enable_apicv(struct kvm_vcpu *vcpu)
{
return enable_apicv;
--
1.8.3.1
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