diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-02-08 12:54:12 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-20 09:26:20 +0200 |
| commit | 095cf55df715d14d5dad75326faf5984e7fc0b3a (patch) | |
| tree | 6cb5516b7594b4aaf1208b6dae4d9a1cefa9be15 /arch/x86/kvm/x86.c | |
| parent | 108b249c453dd7132599ab6dc7e435a7036c193f (diff) | |
| download | lwn-095cf55df715d14d5dad75326faf5984e7fc0b3a.tar.gz lwn-095cf55df715d14d5dad75326faf5984e7fc0b3a.zip | |
KVM: x86: Hyper-V tsc page setup
Lately tsc page was implemented but filled with empty
values. This patch setup tsc page scale and offset based
on vcpu tsc, tsc_khz and HV_X64_MSR_TIME_REF_COUNT value.
The valid tsc page drops HV_X64_MSR_TIME_REF_COUNT msr
reads count to zero which potentially improves performance.
Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Peter Hornyack <peterhornyack@google.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
[Computation of TSC page parameters rewritten to use the Linux timekeeper
parameters. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 81e9945cdf28..3ee8a91a78c3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1887,10 +1887,10 @@ static int kvm_guest_time_update(struct kvm_vcpu *v) vcpu->hv_clock.flags = pvclock_flags; - if (!vcpu->pv_time_enabled) - return 0; - - kvm_setup_pvclock_page(v); + if (vcpu->pv_time_enabled) + kvm_setup_pvclock_page(v); + if (v == kvm_get_vcpu(v->kvm, 0)) + kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock); return 0; } |