Re: [PATCH] vhost: introduce vDPA based backend

[Jason Wang]

On 2020/2/5 äå10:02, Tiwei Bie wrote:
> > Before trying to do this it looks to me we need the following during the
> > probe
> >
> > 1) if set_map() is not supported by the vDPA device probe the IOMMU that is
> > supported by the vDPA device
> > 2) allocate IOMMU domain
> >
> > And then:
> >
> > 3) pin pages through GUP and do proper accounting
> > 4) store GPA->HPA mapping in the umem
> > 5) generate diffs of memory table and using IOMMU API to setup the dma
> > mapping in this method
> >
> > For 1), I'm not sure parent is sufficient for to doing this or need to
> > introduce new API like iommu_device in mdev.
> Agree. We may also need to introduce something like
> the iommu_device.

Right, this is what I plan to do in next version.

Thanks