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

Vivek Kumar Gautam
2021-04-06T06:27:31Z

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@redhat.com/

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