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

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[ Upstream commit bf9a41377d ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andre Przywara
2018-04-17 11:23:49 +01:00
committed by Greg Kroah-Hartman
parent cca7949e4b
commit d93d91951f
1 changed files with 8 additions and 0 deletions
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8
virt/kvm/arm/vgic/vgic.c
View File

@@ -599,6 +599,7 @@ retry:
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);
@@ -669,11 +670,18 @@ retry:
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;
}