From: Hayato Ohhashi Date: Tue, 21 Jul 2020 16:12:31 +0000 (+0000) Subject: x86/xen/time: Set the X86_FEATURE_TSC_KNOWN_FREQ flag in xen_tsc_khz() X-Git-Tag: block-5.9-2020-08-14~57^2 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=898ec52d2ba05915aaedcdb21bff2e944c883cb8;p=linux-2.6-block.git 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 Signed-off-by: Ingo Molnar Reviewed-by: Boris Ostrovsky Link: https://lore.kernel.org/r/20200721161231.6019-1-o8@vmm.dev --- 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); }