---

yaml
---
r: 271491
b: refs/heads/master
c: d5c1785
h: refs/heads/master
i:
  271489: 6cc3d66
  271487: ffecfe7
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e1a72ae287f3ea4fea63b6f14a662a15e8c11960
+refs/heads/master: d5c1785d2f3aabe284d91bc7fc8f0abc58525dc9

trunk/arch/x86/include/asm/kvm_host.h

@@ -630,6 +630,7 @@ struct kvm_x86_ops {
 	void (*write_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset);
 
 	u64 (*compute_tsc_offset)(struct kvm_vcpu *vcpu, u64 target_tsc);
+	u64 (*read_l1_tsc)(struct kvm_vcpu *vcpu);
 
 	void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2);
 

trunk/arch/x86/kvm/svm.c

@@ -2910,6 +2910,13 @@ static int cr8_write_interception(struct vcpu_svm *svm)
 	return 0;
 }
 
+u64 svm_read_l1_tsc(struct kvm_vcpu *vcpu)
+{
+	struct vmcb *vmcb = get_host_vmcb(to_svm(vcpu));
+	return vmcb->control.tsc_offset +
+		svm_scale_tsc(vcpu, native_read_tsc());
+}
+
 static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
@@ -4201,6 +4208,7 @@ static struct kvm_x86_ops svm_x86_ops = {
 	.write_tsc_offset = svm_write_tsc_offset,
 	.adjust_tsc_offset = svm_adjust_tsc_offset,
 	.compute_tsc_offset = svm_compute_tsc_offset,
+	.read_l1_tsc = svm_read_l1_tsc,
 
 	.set_tdp_cr3 = set_tdp_cr3,
 

trunk/arch/x86/kvm/vmx.c

@@ -1747,6 +1747,21 @@ static u64 guest_read_tsc(void)
 	return host_tsc + tsc_offset;
 }
 
+/*
+ * Like guest_read_tsc, but always returns L1's notion of the timestamp
+ * counter, even if a nested guest (L2) is currently running.
+ */
+u64 vmx_read_l1_tsc(struct kvm_vcpu *vcpu)
+{
+	u64 host_tsc, tsc_offset;
+
+	rdtscll(host_tsc);
+	tsc_offset = is_guest_mode(vcpu) ?
+		to_vmx(vcpu)->nested.vmcs01_tsc_offset :
+		vmcs_read64(TSC_OFFSET);
+	return host_tsc + tsc_offset;
+}
+
 /*
  * Empty call-back. Needs to be implemented when VMX enables the SET_TSC_KHZ
  * ioctl. In this case the call-back should update internal vmx state to make
@@ -7010,6 +7025,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
 	.write_tsc_offset = vmx_write_tsc_offset,
 	.adjust_tsc_offset = vmx_adjust_tsc_offset,
 	.compute_tsc_offset = vmx_compute_tsc_offset,
+	.read_l1_tsc = vmx_read_l1_tsc,
 
 	.set_tdp_cr3 = vmx_set_cr3,
 

trunk/arch/x86/kvm/x86.c

@@ -1098,7 +1098,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
 
 	/* Keep irq disabled to prevent changes to the clock */
 	local_irq_save(flags);
-	kvm_get_msr(v, MSR_IA32_TSC, &tsc_timestamp);
+	tsc_timestamp = kvm_x86_ops->read_l1_tsc(v);
 	kernel_ns = get_kernel_ns();
 	this_tsc_khz = vcpu_tsc_khz(v);
 	if (unlikely(this_tsc_khz == 0)) {
@@ -2218,7 +2218,7 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		s64 tsc_delta;
 		u64 tsc;
 
-		kvm_get_msr(vcpu, MSR_IA32_TSC, &tsc);
+		tsc = kvm_x86_ops->read_l1_tsc(vcpu);
 		tsc_delta = !vcpu->arch.last_guest_tsc ? 0 :
 			     tsc - vcpu->arch.last_guest_tsc;
 
@@ -2242,7 +2242,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 {
 	kvm_x86_ops->vcpu_put(vcpu);
 	kvm_put_guest_fpu(vcpu);
-	kvm_get_msr(vcpu, MSR_IA32_TSC, &vcpu->arch.last_guest_tsc);
+	vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
 }
 
 static int is_efer_nx(void)
@@ -5729,7 +5729,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 	if (hw_breakpoint_active())
 		hw_breakpoint_restore();
 
-	kvm_get_msr(vcpu, MSR_IA32_TSC, &vcpu->arch.last_guest_tsc);
+	vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
 
 	vcpu->mode = OUTSIDE_GUEST_MODE;
 	smp_wmb();