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kvm: x86: Deliver MSI IRQ to only lowest prio cpu if msi_redir_hint is true

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An MSI interrupt should only be delivered to the lowest priority CPU
when it has RH=1, regardless of the delivery mode. Modified
kvm_is_dm_lowest_prio() to check for either irq->delivery_mode == APIC_DM_LOWPRI
or irq->msi_redir_hint.

Moved kvm_is_dm_lowest_prio() into lapic.h and renamed to
kvm_lowest_prio_delivery().

Changed a check in kvm_irq_delivery_to_apic_fast() from
irq->delivery_mode == APIC_DM_LOWPRI to kvm_is_dm_lowest_prio().

Signed-off-by: James Sullivan <sullivan.james.f@gmail.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
James Sullivan
2015-03-18 19:26:04 -06:00
committed by Paolo Bonzini
parent 93bbf0b8bc
commit d1ebdbf99a
3 changed files with 11 additions and 8 deletions
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2
arch/x86/kvm/lapic.c
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@@ -728,7 +728,7 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
dst = map->logical_map[cid];
if (irq->delivery_mode == APIC_DM_LOWEST) {
if (kvm_lowest_prio_delivery(irq)) {
int l = -1;
for_each_set_bit(i, &bitmap, 16) {
if (!dst[i])