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authorNadav Amit <namit@cs.technion.ac.il>2014-10-03 00:30:52 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2014-11-03 12:07:22 +0100
commit394457a928e0f7ff121c375966f5ec1980dabc09 (patch)
tree9abcba091bc0bccb2c399fcf3184b4a62b0eca3d /virt
parent52ce3c21aec30d9dd99a89662ae87c657636787b (diff)
downloadlinux-394457a928e0f7ff121c375966f5ec1980dabc09.tar.gz
KVM: x86: some apic broadcast modes does not work
KVM does not deliver x2APIC broadcast messages with physical mode. Intel SDM (10.12.9 ICR Operation in x2APIC Mode) states: "A destination ID value of FFFF_FFFFH is used for broadcast of interrupts in both logical destination and physical destination modes." In addition, the 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. The fix tries to combine broadcast in different modes through a unified code. One rare case occurs when the source of IPI has its APIC disabled. In such case, the source can still issue IPIs, but since the source is not obliged to have the same LAPIC mode as the enabled ones, we cannot rely on it. Since it is a rare case, it is unoptimized and done on the slow-path. Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Reviewed-by: Radim Krčmář <rkrcmar@redhat.com> Reviewed-by: Wanpeng Li <wanpeng.li@linux.intel.com> [As per Radim's review, use unsigned int for X2APIC_BROADCAST, return bool from kvm_apic_broadcast. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/ioapic.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index e23b70634f1..31725a3a93b 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -83,7 +83,7 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
- int short_hand, int dest, int dest_mode);
+ int short_hand, unsigned int dest, int dest_mode);
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector,
int trigger_mode);