Re: [PATCH RFC v1 15/15] iommu/virtio: Update fault type and reason info for viommu fault

[Vivek Kumar Gautam]

On 3/29/21 9:53 PM, Jean-Philippe Brucker wrote:
> On Fri, Mar 12, 2021 at 06:39:05PM +0530, Vivek Kumar Gautam wrote:
> > To complete the page request we would also need to send the response back to
> > the host from virtio backend when handling page request. So the virtio
> > command should also be accompanied with a vfio api to send the page request
> > response back to the host. Isn't it?
> > This is where the host smmuv3 can send PRI_RESP command to the device to
> > complete the page fault.
>
> It looks like Eric already has this in the VFIO series:
> https://lore.kernel.org/linux-iommu/20210223210625.604517-14-eric.auger@xxxxxxxxxx/

Right, I have taken this change to work on getting the vSVA with 
virtio-iommu.
For this I am adding a new request for virtio-iomm - 
VIRTIO_IOMMU_T_PAGE_RESP, and related struct virtio_iommu_req_page_resp 
that would contain information such as, pasid, grpid, response_code, 
flags, and endpoint. This is inline with struct iommu_page_response.
I will post out the patches for this soon.

Thanks & regards
Vivek

> Thanks,
> Jean