From 898ec52d2ba05915aaedcdb21bff2e944c883cb8 Mon Sep 17 00:00:00 2001 From: Hayato Ohhashi Date: Tue, 21 Jul 2020 16:12:31 +0000 Subject: 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 --- arch/x86/xen/time.c | 1 + 1 file changed, 1 insertion(+) 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); } -- cgit v1.2.3