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KVM: arm/arm64: vgic-new: Implement virtual IRQ injection

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Provide a vgic_queue_irq_unlock() function which decides whether a
given IRQ needs to be queued to a VCPU's ap_list.
This should be called whenever an IRQ becomes pending or enabled,
either as a result of userspace injection, from in-kernel emulated
devices like the architected timer or from MMIO accesses to the
distributor emulation.
Also provides the necessary functions to allow userland to inject an
IRQ to a guest.
Since this is the first code that starts using our locking mechanism, we
add some (hopefully) clear documentation of our locking strategy and
requirements along with this patch.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Christoffer Dall
2015-11-25 10:02:16 -08:00
parent 64a959d66e
commit 81eeb95ddb
3 changed files with 215 additions and 0 deletions
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virt/kvm/arm/vgic/vgic.h
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@@ -18,5 +18,6 @@
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
u32 intid);
bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq);
#endif