Messages in this thread | | | Date | Mon, 5 Oct 2015 22:12:34 +0200 | From | Radim Krčmář <> | Subject | Re: [PATCH 08/12] KVM: x86: Use the correct vcpu's TSC rate to compute time scale |
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2015-09-28 13:38+0800, Haozhong Zhang: > 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@intel.com> > --- > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > @@ -1782,7 +1782,9 @@ 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);
Good catch, it seems that SVM didn't scale kvmclock correctly ... I think we'll want this patch in stable.
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