Messages in this thread | | | Subject | Re: [PATCH 0/3] xen: remove some checks for always present Xen features | From | Jan Beulich <> | Date | Thu, 22 Apr 2021 17:16:03 +0200 |
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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.
Jan
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