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KVM: x86: some apic broadcast modes does not work

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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 <[email protected]>
Reviewed-by: Radim Krčmář <[email protected]>
Reviewed-by: Wanpeng Li <[email protected]>
[As per Radim's review, use unsigned int for X2APIC_BROADCAST, return bool from
 kvm_apic_broadcast. - Paolo]
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Nadav Amit 2014-10-03 00:30:52 +03:00 • committed by Paolo Bonzini
commit 394457a928
4 changed files with 26 additions and 10 deletions
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2
virt/kvm/ioapic.h
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@ -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);