Re: [Xen-devel] PV DRM doesn't work without auto_translated_physmap feature in Dom0

[Jürgen Groß <jgross@xxxxxxxx>]

On 06.01.20 08:56, Santucco wrote:
> Hello,
>
> I’m trying to use vdispl interface from PV OS, it doesn’t work.
> Configuration details:
>      Xen 4.12.1
>      Dom0: Linux 4.20.17-gentoo #13 SMP Sat Dec 28 11:12:24 MSK 2019 x86_64 
> Intel(R) Celeron(R) CPU N3050 @ 1.60GHz GenuineIntel GNU/Linux
>      DomU: x86 Plan9, PV
>      displ_be as a backend for vdispl and vkb
>
> when VM starts, displ_be reports about an error:
> gnttab: error: ioctl DMABUF_EXP_FROM_REFS failed: Invalid argument 
> (displ_be.log:221)
>
> related Dom0 output is:
> [  191.579278] Cannot provide dma-buf: use_ptemode 1 (dmesg.create.log:123)
This seems to be a limitation of the xen dma-buf driver. It was written
for being used on ARM initially where PV is not available.

CC-ing Oleksandr Andrushchenko who is the author of that driver. He
should be able to tell us what would be needed to enable PV dom0.

Depending on your use case it might be possible to use PVH dom0, but
support for this mode is "experimental" only and some features are not
yet working.


Juergen


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