irqchip/gic-v5: Allow KVM setup without a maintenance IRQ

GICv5 does not require a virtual CPU interface maintenance interrupt
for native GCIE operation. The interrupt is only needed when
FEAT_GCIE_LEGACY is present, as the legacy GICv3 interface still
relies on maintenance IRQ delivery.

Stop rejecting KVM setup solely because the maintenance interrupt is
absent. Parse the interrupt if present, but if none is described and
the system does not advertise FEAT_GCIE_LEGACY, tell KVM that no
maintenance interrupt is required.

This lets native GICv5 KVM support be registered on systems that do
not provide a maintenance interrupt, while requiring a maintenance
interrupt for GICv3-capable systems.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Link: https://patch.msgid.link/20260904113404.4051341-2-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

0 files changed, 0 insertions, 0 deletions