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KVM: arm/arm64: vgic: Kick new VCPU on interrupt migration

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When vgic_prune_ap_list() finds an interrupt that needs to be migrated
to a new VCPU, we should notify this VCPU of the pending interrupt,
since it requires immediate action.
Kick this VCPU once we have added the new IRQ to the list, but only
after dropping the locks.

Reported-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Andre Przywara 2018-04-17 11:23:49 +01:00 committed by Marc Zyngier
parent 165d102905
commit bf9a41377d
1 changed files with 8 additions and 0 deletions
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8
virt/kvm/arm/vgic/vgic.c
View file

@ -594,6 +594,7 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB;
bool target_vcpu_needs_kick = false;
spin_lock(&irq->irq_lock);
@ -664,11 +665,18 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
list_del(&irq->ap_list);
irq->vcpu = target_vcpu;
list_add_tail(&irq->ap_list, &new_cpu->ap_list_head);
target_vcpu_needs_kick = true;
}
spin_unlock(&irq->irq_lock);
spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
spin_unlock_irqrestore(&vcpuA->arch.vgic_cpu.ap_list_lock, flags);
if (target_vcpu_needs_kick) {
kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu);
kvm_vcpu_kick(target_vcpu);
}
goto retry;
}