[PATCH 2/2] x86: kvm: do not advertise stable clocksource if CPU has TSC drift BUG
From: Igor Mammedov
Date: Thu Jul 31 2014 - 05:48:43 EST
Signed-off-by: Igor Mammedov <imammedo@xxxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 38a0afe..f519823 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -478,8 +478,9 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
(1 << KVM_FEATURE_CLOCKSOURCE2) |
(1 << KVM_FEATURE_ASYNC_PF) |
(1 << KVM_FEATURE_PV_EOI) |
- (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
(1 << KVM_FEATURE_PV_UNHALT);
+ if (!static_cpu_has_bug(X86_BUG_AMD_TSC_DRIFT))
+ entry->eax |= (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
if (sched_info_on())
entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
--
1.8.3.1
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