Re: [PATCH 2/2] vfio: only check region info cache for initial regions

["Cédric Le Goater" <clg@redhat.com>]

On 10/14/25 17:12, John Levon wrote:
> It is semantically valid for a VFIO device to increase the number of
> regions after initialization. In this case, we'd attempt to check for
> cached region info past the size of the ->reginfo array. Check for the
> region index and skip the cache in these cases.
> 
> This also works around some VGPU use cases which appear to be a bug,
> where VFIO_DEVICE_QUERY_GFX_PLANE returns a region index beyond the
> reported ->num_regions.
> 
> Fixes: 95cdb024 ("vfio: add region info cache")
> Signed-off-by: John Levon <john.levon@nutanix.com>


Cc: qemu-stable@nongnu.org

> ---
>   hw/vfio/device.c | 27 +++++++++++++++++++--------
>   1 file changed, 19 insertions(+), 8 deletions(-)
> 

Reviewed-by: Cédric Le Goater <clg@redhat.com>

Thanks,

C.