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| author | Haozhong Zhang <haozhong.zhang@intel.com> | 2015-10-20 15:39:08 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-10 12:06:18 +0100 |
| commit | 27cca94e032c1749825fdd9b6b379e4235cd52e1 (patch) | |
| tree | ab4c1deff2a494fcb2a51a00851f2bb4e70d84f0 /arch/x86/kvm | |
| parent | 4ba76538dd52dd9b18b464e509cb8f3ed4ed993f (diff) | |
| download | linux-27cca94e032c1749825fdd9b6b379e4235cd52e1.tar.gz | |
KVM: x86: Use the correct vcpu's TSC rate to compute time scale
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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3d008de9cb05..2cb074f5aaed 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1707,7 +1707,7 @@ 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; @@ -1770,7 +1770,9 @@ 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; |