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authorGlauber Costa <glommer@redhat.com>2010-05-11 18:17:45 +0200
committerAvi Kivity <avi@redhat.com>2010-05-19 10:41:05 +0200
commit3a0d7256a6fb8c13f9fac6cd63250f97a8f0d8de (patch)
tree27a710b0f7e54c243382d47c290061699d0e755c /arch/x86/kernel/kvmclock.c
parentx86: KVM guest: Try using new kvm clock msrs (diff)
downloadlinux-3a0d7256a6fb8c13f9fac6cd63250f97a8f0d8de.tar.xz
linux-3a0d7256a6fb8c13f9fac6cd63250f97a8f0d8de.zip
x86, paravirt: don't compute pvclock adjustments if we trust the tsc
If the HV told us we can fully trust the TSC, skip any correction Signed-off-by: Glauber Costa <glommer@redhat.com> Acked-by: Zachary Amsden <zamsden@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kernel/kvmclock.c')
-rw-r--r--arch/x86/kernel/kvmclock.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 59c740fcb9b3..eb9b76c716c2 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -215,4 +215,7 @@ void __init kvmclock_init(void)
clocksource_register(&kvm_clock);
pv_info.paravirt_enabled = 1;
pv_info.name = "KVM";
+
+ if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE_STABLE_BIT))
+ pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
}