Re: [PATCH v4 06/10] vfio: selftests: Allow drivers to specify required region size

[Jason Gunthorpe <jgg@nvidia.com>]

On Wed, Aug 12, 2026 at 10:11:30PM +0000, David Matlack wrote:
> > @@ -32,6 +32,9 @@ void vfio_pci_driver_probe(struct vfio_pci_device *device)
> >  			continue;
> >  
> >  		device->driver.ops = ops;
> > +
> > +		VFIO_ASSERT_NE(ops->region_size, 0);
> > +		device->driver.region.size = ops->region_size;
> 
> I'm seeing failures with the IGB driver with this series. I think it's
> coming from here. The region size needs to be page-aligned so that the
> IOMMU map/unmap calls can work?
> 
> The size of struct igb is 0x20080 bytes which is not page-aligned. The
> size of struct mlx5st_device is 0x200D000, which is page-aligned, so
> that's probably why your Claude did not notice.

Makes sense, I didn't use claude for this, but it explains why my
tests passed. I've adjusted it as you showed

Jason