diff options
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 4950bb20e06a..886930db77c5 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1213,13 +1213,13 @@ static void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu) new.control) != old.control); /* - * Clear SN before reading the bitmap; this ensures that any - * interrupt that comes after the bitmap is read sets ON. The - * VT-d firmware * writes the bitmap and reads SN atomically (5.2.3 - * in the spec), so it doesn't really have a memory barrier that - * pairs with this. However, we cannot do that and we need one. + * Clear SN before reading the bitmap. The VT-d firmware + * writes the bitmap and reads SN atomically (5.2.3 in the + * spec), so it doesn't really have a memory barrier that + * pairs with this, but we cannot do that and we need one. */ smp_mb__after_atomic(); + if (!bitmap_empty((unsigned long *)pi_desc->pir, NR_VECTORS)) pi_set_on(pi_desc); } |