This patch makes KVM use virtual_tsc_khz rather than the host TSC rate
as vcpu's TSC rate to compute the time scale if TSC scaling is enabled.
Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
arch/x86/kvm/x86.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f2516bf..d5690a3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1698,7 +1698,7 @@ static void kvm_gen_update_masterclock(struct kvm *kvm)
static int kvm_guest_time_update(struct kvm_vcpu *v)
{
- unsigned long flags, this_tsc_khz;
+ unsigned long flags, this_tsc_khz, tgt_tsc_khz;
struct kvm_vcpu_arch *vcpu = &v->arch;
struct kvm_arch *ka = &v->kvm->arch;
s64 kernel_ns;
@@ -1761,7 +1761,9 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
return 0;
if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
- kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
+ tgt_tsc_khz = kvm_has_tsc_control ?
+ vcpu->virtual_tsc_khz : this_tsc_khz;
+ kvm_get_time_scale(NSEC_PER_SEC / 1000, tgt_tsc_khz,
&vcpu->hv_clock.tsc_shift,
&vcpu->hv_clock.tsc_to_system_mul);
vcpu->hw_tsc_khz = this_tsc_khz;
--
2.4.8
--
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