Re: [PATCH v2 0/6] gnttab: add per-domain controls

[Julien Grall <julien@xxxxxxx>]

On 22/09/2021 13:21, Roger Pau Monne wrote:
> Hello,
Hi Roger,

> First patch on the series is a trivial change to xenconsoled in order to
> use xenforeignmemory stable library in order to map the shared console
> ring instead of the unstable libxc interface. It's reviewed and ready to
> go in.
>
> Patches 2 and 3 allow setting the host wide command line `gnttab` option
> on a per domain basis. That means selecting the max allowed grant table
> version and whether transitive grants are allowed.
>
> The last 3 patches attempt to implement support for creating guests
> without a grant table. This requires some changes to xenstored in order
> to partially support guests without a valid ring interface, as the lack
> of grant table will prevent C xenstored from mapping the shared ring.
> Note this is not an issue for Ocaml xenstored, as it still uses the
> foreign memory interface to map the shared ring, and thus won't notice
> the lack of grant table support on the domain.
I find a bit odd that the Xenstore support is conditional to whether 
grant table is available. Are you expecting domains with no grant table 
to have no PV drivers (including PV shutdown)?
Cheers,

--
Julien Grall