Local-apic enables cluster mode broadcast. As Intel SDM 10.6.2.2 says:
"Broadcast to all local APICs is achieved by setting all destination bits to
one." This patch enables cluster mode broadcast.
Signed-off-by: Nadav Amit <na...@cs.technion.ac.il>
---
arch/x86/kvm/lapic.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index efb1939..05c9a46 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -560,8 +560,8 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8
mda)
result = 1;
break;
case APIC_DFR_CLUSTER:
- if (((logical_id >> 4) == (mda >> 0x4))
- && (logical_id & mda & 0xf))
+ if ((((logical_id >> 4) == (mda >> 0x4))
+ && (logical_id & mda & 0xf)) || mda == 0xff)
result = 1;
break;
default:
@@ -644,6 +644,10 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct
kvm_lapic *src,
} else {
u32 mda = irq->dest_id << (32 - map->ldr_bits);
+ if (irq->dest_id == 0xff &&
+ kvm_apic_get_reg(src, APIC_DFR) == APIC_DFR_CLUSTER)
+ goto out; /* cluster mode broadcast */
+
dst = map->logical_map[apic_cluster_id(map, mda)];
bitmap = apic_logical_id(map, mda);
--
1.9.1
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