diff options
| author | Hayato Ohhashi <[email protected]> | 2020-07-21 16:12:31 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2020-07-25 15:49:41 +0200 |
| commit | 898ec52d2ba05915aaedcdb21bff2e944c883cb8 (patch) | |
| tree | ffbc8924e513eb3f801698cea48b127c8f64839f | |
| parent | 23ee3e4e5bd27bdbc0f1785eef7209ce872794c7 (diff) | |
x86/xen/time: Set the X86_FEATURE_TSC_KNOWN_FREQ flag in xen_tsc_khz()
If the TSC frequency is known from the pvclock page,
the TSC frequency does not need to be recalibrated.
We can avoid recalibration by setting X86_FEATURE_TSC_KNOWN_FREQ.
Signed-off-by: Hayato Ohhashi <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
| -rw-r--r-- | arch/x86/xen/time.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index c8897aad13cd..91f5b330dcc6 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -39,6 +39,7 @@ static unsigned long xen_tsc_khz(void) struct pvclock_vcpu_time_info *info = &HYPERVISOR_shared_info->vcpu_info[0].time; + setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ); return pvclock_tsc_khz(info); } |