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

[David Woodhouse]

On Tue, 2025-06-24 at 09:25 +0200, Eric Auger wrote:
> Hi David,
> 
> On 6/23/25 3:22 PM, 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>
>
> In the corresponding doc (virt/kvm/devices/arm-vgic-its.rst)
> it is said about possible returned values:
>      -ENXIO  ITS not properly configured as required prior to setting
>              this attribute
> which does not exactly match your situation. Shouldn't we also update
> the doc or change the returned value?

Hi Eric, thanks for looking at this.

I think this is OK because the -ENXIO return is covered by the high-
level description of KVM_[GS]ET_DEVICE_ATTR in virt/kvm/api.rst:

Errors:

  =====   =============================================================
  ENXIO   The group or attribute is unknown/unsupported for this device
          or hardware support is missing.

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