[PATCH v2 00/11] Connect VFIO to IOMMUFD

[Jason Gunthorpe]

On Mon, Nov 14, 2022 at 09:55:21AM -0500, Matthew Rosato wrote:
> >> AFAICT there is no equivalent means to specify
> >> vfio_iommu_type1.dma_entry_limit when using iommufd; looks like
> >> we'll just always get the default 65535.
> > 
> > No, there is no arbitary limit on iommufd
> 
> Yeah, that's what I suspected.  But FWIW, userspace checks the
> advertised limit via VFIO_IOMMU_GET_INFO /
> VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL, and this is still being advertised
> as 65535 when using iommufd.  I don't think there is a defined way
> to return 'ignore this value'.

Is something using this? Should we make it much bigger?

Jason