KVM: arm64: vgic-its: Return -ENXIO to invalid KVM_DEV_ARM_VGIC_GRP_CTRL attrs

[David Woodhouse]

On Mon, 2025-06-23 at 15:22 +0200, David Woodhouse wrote:
> From: David Woodhouse <dwmw at amazon.co.uk>
> 
> A preliminary version of a hack to invoke unmap_all_vpes() from an ioctl
> didn't work very well. We eventually determined this was because we were
> invoking it on the wrong file descriptor, but not getting an error.
> 
> Signed-off-by: David Woodhouse <dwmw at amazon.co.uk>

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