Re: [PATCH] xen: don't require virtio with grants for non-PV guests

[Oleksandr <olekstysh@xxxxxxxxx>]

On 15.06.22 11:48, Juergen Gross wrote:

Hello Juergen

> Commit fa1f57421e0b ("xen/virtio: Enable restricted memory access using
> Xen grant mappings") introduced a new requirement for using virtio
> devices: the backend now needs to support the VIRTIO_F_ACCESS_PLATFORM
> feature.
>
> This is an undue requirement for non-PV guests, as those can be operated
> with existing backends without any problem, as long as those backends
> are running in dom0.
>
> Per default allow virtio devices without grant support for non-PV
> guests.
>
> The setting can be overridden by using the new "xen_virtio_grant"
> command line parameter.
>
> Add a new config item to always force use of grants for virtio.
>
> Fixes: fa1f57421e0b ("xen/virtio: Enable restricted memory access using Xen grant 
> mappings")
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Thank you for the fix.


I have tested it on Arm64 guest (XEN_HVM_DOMAIN), it works.

With the "__init" fix (pointed out by Viresh) applied you can add my:

Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> #Arm64 only


[snip]


--
Regards,

Oleksandr Tyshchenko