Re: [PATCH v5 11/19] iommufd: IOCTLs for the io_pagetable

Jason Gunthorpe
2022-11-28T18:12:00Z

On Mon, Nov 28, 2022 at 09:05:48AM +0000, Tian, Kevin wrote:
> > From: Eric Auger <eric.auger@redhat.com>
> > Sent: Monday, November 28, 2022 1:49 AM
> > > +struct iommu_ioas_copy {
> > > + __u32 size;
> > > + __u32 flags;
> > > + __u32 dst_ioas_id;
> > > + __u32 src_ioas_id;
> > is src_ioas_id == dst_ioas_id allowed?
>
> I suppose so. iommufd_ioas_copy() simply gets a reference to
> underlying iopt_pages according to [src_ioas_id, src_iova] and
> then map it into [dst_ioas_id, dst_iova]. It doesn’t matter
> whether iopt_pages comes from a same or different ioas.
>
> The only restriction is that the src/dst ranges don't overlap.

Right

Jason