Courtesy of Christoffer Dall.
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
arch/arm/kvm/vgic.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/arch/arm/kvm/vgic.c b/arch/arm/kvm/vgic.c
index 184652b..7b8afec 100644
--- a/arch/arm/kvm/vgic.c
+++ b/arch/arm/kvm/vgic.c
@@ -36,7 +36,8 @@
* something is pending
* - VGIC pending interrupts are stored on the vgic.irq_state vgic
* bitmap (this bitmap is updated by both user land ioctls and guest
- * mmio ops) and indicate the 'wire' state.
+ * mmio ops, and other in-kernel peripherals such as the
+ * arch. timers) and indicate the 'wire' state.
* - Every time the bitmap changes, the irq_pending_on_cpu oracle is
* recalculated
* - To calculate the oracle, we need info for each cpu from
@@ -1111,6 +1112,20 @@ out:
return ret;
}
+/**
+ * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
+ * @kvm: The VM structure pointer
+ * @cpuid: The CPU for PPIs
+ * @irq_num: The IRQ number that is assigned to the device
+ * @level: Edge-triggered: true: to trigger the interrupt
+ * false: to ignore the call
+ * Level-sensitive true: activates an interrupt
+ * false: deactivates an interrupt
+ *
+ * The GIC is not concerned with devices being active-LOW or active-HIGH for
+ * level-sensitive interrupts. You can think of the level parameter as 1
+ * being HIGH and 0 bing LOW and all devices being active-HIGH.
+ */
int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
bool level)
{
--
1.8.0.1
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