From fa834e919788dfa0965495f21760eb38fe480342 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Thu, 27 Nov 2014 20:03:12 +0100 Subject: [PATCH] KVM: x86: fix APIC physical destination wrapping MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Paolo Bonzini --- 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 541e17865e63..bd82054664fd 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -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); -- 2.20.1