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path: root/drivers/kvm
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-rw-r--r--drivers/kvm/vmx.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 0b2aace70ae..d06c3627f64 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -160,6 +160,7 @@ static void __vcpu_clear(void *arg)
vmcs_clear(vcpu->vmcs);
if (per_cpu(current_vmcs, cpu) == vcpu->vmcs)
per_cpu(current_vmcs, cpu) = NULL;
+ rdtscll(vcpu->host_tsc);
}
static void vcpu_clear(struct kvm_vcpu *vcpu)
@@ -376,6 +377,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
{
u64 phys_addr = __pa(vcpu->vmcs);
int cpu;
+ u64 tsc_this, delta;
cpu = get_cpu();
@@ -409,6 +411,13 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
+
+ /*
+ * Make sure the time stamp counter is monotonous.
+ */
+ rdtscll(tsc_this);
+ delta = vcpu->host_tsc - tsc_this;
+ vmcs_write64(TSC_OFFSET, vmcs_read64(TSC_OFFSET) + delta);
}
}