Commit 6755bae8 authored by Zachary Amsden's avatar Zachary Amsden Committed by Avi Kivity
Browse files

KVM: x86: Warn about unstable TSC 



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

Signed-off-by: default avatarZachary Amsden <zamsden@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 8cfdc000

arch/x86/kvm/x86.c

+4 −0
Original line number Diff line number Diff line
@@ -5457,6 +5457,10 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) 
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,

						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);

}