irq: add irqfd helpers
Add helpers to add and remove IRQFD routing for both irqchips and MSIs.
We have to make a special case of IRQ lines on ARM where the
initialisation order goes like this:
(1) Devices reserve their IRQ lines
(2) VGIC is setup with VGIC_CTRL_INIT (in a late_init call)
(3) MSIs are reserved lazily, when the guest needs them
Since we cannot setup IRQFD before (2), store the IRQFD routing for IRQ
lines temporarily until we're ready to submit them.
Reviewed-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
7 files changed
