diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-01 14:21:03 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-20 09:26:15 +0200 |
| commit | 108b249c453dd7132599ab6dc7e435a7036c193f (patch) | |
| tree | eb600c0558d7032bc1b0c62066f74ac109bd4fd7 /arch/x86/kvm/hyperv.c | |
| parent | 67198ac3f37ffb150f1c95fae16b597339eabc9d (diff) | |
KVM: x86: introduce get_kvmclock_ns
Introduce a function that reads the exact nanoseconds value that is
provided to the guest in kvmclock. This crystallizes the notion of
kvmclock as a thin veneer over a stable TSC, that the guest will
(hopefully) convert with NTP. In other words, kvmclock is *not* a
paravirtualized host-to-guest NTP.
Drop the get_kernel_ns() function, that was used both to get the base
value of the master clock and to get the current value of kvmclock.
The former use is replaced by ktime_get_boot_ns(), the latter is
the purpose of get_kernel_ns().
This also allows KVM to provide a Hyper-V time reference counter that
is synchronized with the time that is computed from the TSC page.
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/hyperv.c')
| -rw-r--r-- | arch/x86/kvm/hyperv.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 01bd7b7a6866..ed5b77f39ffb 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -386,7 +386,7 @@ static void synic_init(struct kvm_vcpu_hv_synic *synic) static u64 get_time_ref_counter(struct kvm *kvm) { - return div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100); + return div_u64(get_kvmclock_ns(kvm), 100); } static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, |