Messages in this thread Patch in this message | | | From | Radim Krčmář <> | Subject | [PATCH 2/4] KVM: x86: fix APIC physical destination wrapping | Date | Thu, 27 Nov 2014 20:03:12 +0100 |
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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> --- 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
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