Re: [PATCH 0/3] xen: remove some checks for always present Xen features

[Juergen Gross]

On 22.04.21 17:16, Jan Beulich wrote:
> On 22.04.2021 17:10, Juergen Gross wrote:
> > Some features of Xen can be assumed to be always present, so add a
> > central check to verify this being true and remove the other checks.
> >
> > Juergen Gross (3):
> >    xen: check required Xen features
> >    xen: assume XENFEAT_mmu_pt_update_preserve_ad being set for pv guests
> >    xen: assume XENFEAT_gnttab_map_avail_bits being set for pv guests
>
> I wonder whether it's a good idea to infer feature presence from
> version numbers. If (at some point in the past) you had inferred
> gnttab v2 being available by version, this would have been broken
> by its availability becoming controllable by a command line option
> in Xen.

I'm testing the feature to be really present when booting and issue a
message if it is not there.

Juergen

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