[PATCH 2/3] KVM: arm64: vgic: Allow registration of a non-maskable maintenance interrupt

Marc Zyngier
2023-01-03T09:51:23Z

Our Apple M1/M2 friends do have a per-CPU maintenance interrupt,
but no mask to make use of it in the standard Linux framework.

Given that KVM directly drives the *source* of the interrupt and
leaves the GIC interrupt always enabled, there is no harm in tolerating
such a setup. It will become useful once we enable NV on M2 HW.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/vgic/vgic-init.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
index f6d4f4052555..e61d9ca01768 100644
--- a/arch/arm64/kvm/vgic/vgic-init.c
+++ b/arch/arm64/kvm/vgic/vgic-init.c
@@ -572,7 +572,7 @@ int kvm_vgic_hyp_init(void)
if (ret)
return ret;

- if (!has_mask)
+ if (!has_mask && !kvm_vgic_global_state.maint_irq)
return 0;

ret = request_percpu_irq(kvm_vgic_global_state.maint_irq,
--
2.34.1