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KVM: x86: fix APIC physical destination wrapping

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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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2014-11-27 20:03:12 +01:00 committed by Paolo Bonzini
parent 085563fb04
commit fa834e9197
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kvm/lapic.c
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@ -693,7 +693,10 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
ret = true;
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);