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KVM: x86: Warn about unstable TSC

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If creating an SMP guest with unstable host TSC, issue a warning

Signed-off-by: Zachary Amsden <zamsden@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Zachary Amsden
2010-08-19 22:07:22 -10:00
committed by Avi Kivity
parent 8cfdc00085
commit 6755bae8e6
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/x86.c
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@@ -5457,6 +5457,10 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id) unsigned int id)
{ {
if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
printk_once(KERN_WARNING
"kvm: SMP vm created on host with unstable TSC; "
"guest TSC will not be reliable\n");
return kvm_x86_ops->vcpu_create(kvm, id); return kvm_x86_ops->vcpu_create(kvm, id);
} }