If creating an SMP guest with unstable host TSC, issue a warning
Signed-off-by: Zachary Amsden <zamsden@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3420f25..5e3b10e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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);
}
--
1.7.1
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