[PATCH 2/4] KVM: x86: fix APIC physical destination wrapping

Radim Krčmář
2014-11-27T19:04:10Z

x2apic allows destinations > 0xff and we don't want them delivered to
lower APICs. They are correctly handled by doing nothing.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
arch/x86/kvm/lapic.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e8ad09d..049d30f 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -691,7 +691,10 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
goto out;

if (irq->dest_mode == 0) { /* physical mode */
- dst = &map->phys_map[irq->dest_id & 0xff];
+ if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
+ goto out;
+
+ dst = &map->phys_map[irq->dest_id];
} else {
u32 mda = irq->dest_id << (32 - map->ldr_bits);

--
2.1.0