Re: [PATCH] vhost: introduce vDPA based backend

[Jason Wang]

On 2020/2/5 äå10:05, Tiwei Bie wrote:
> On Tue, Feb 04, 2020 at 02:46:16PM +0800, Jason Wang wrote:
> > On 2020/2/4 äå2:01, Michael S. Tsirkin wrote:
> > > On Tue, Feb 04, 2020 at 11:30:11AM +0800, Jason Wang wrote:
> > > > 5) generate diffs of memory table and using IOMMU API to setup the dma
> > > > mapping in this method
> > > Frankly I think that's a bunch of work. Why not a MAP/UNMAP interface?
> > Sure, so that basically VHOST_IOTLB_UPDATE/INVALIDATE I think?
> Do you mean we let userspace to only use VHOST_IOTLB_UPDATE/INVALIDATE
> to do the DMA mapping in vhost-vdpa case? When vIOMMU isn't available,
> userspace will set msg->iova to GPA, otherwise userspace will set
> msg->iova to GIOVA, and vhost-vdpa module will get HPA from msg->uaddr?
>
> Thanks,
> Tiwei


I think so. Michael, do you think this makes sense?

Thanks


> > Thanks