Re: [PATCH] drm/virtio: use the DMA API for resource backing on Xen

[email protected] writes:

> [Severity: High]
> This is a pre-existing issue, but while enabling the DMA API for Xen PV
> domains, does this leave guest-bound transfers vulnerable to data corruption
> with SWIOTLB bounce buffers?

Yep, preexisting issue, but not reachable via plain `virtio-vga`.

Only reachable, AFAICT, if `has_virgl_3d` is enabled. The missing `_for_cpu`` sync
is pre-existing since 8f44ca223345 and pretty orthogonal to this change.

A correct fix most likely belongs in the completion path rather than at submission,
anyway, so I’m not sure it makes a lot of sense to include in this patch.

Happy to do that in a followup/separate patch, if requested.

Ben