Re: [Xen-devel] [PATCH] libxc/migration: Drop unimplemneted domain types

[Julien Grall <julien@xxxxxxx>]

Hi,

On 20/12/2019 18:30, Andrew Cooper wrote:
> On 20/12/2019 18:24, Ian Jackson wrote:
> > Andrew Cooper writes ("[PATCH] libxc/migration: Drop unimplemneted domain 
> > types"):
> > > x86 PVH is completely obsolete - it was intended for legacy PVH before that
> > > idea was abandoned.  There was an RFC series for ARM in 2015, but there is
> > > plenty of outstanding work which hasn't been done yet.
> > >
> > > No functional change.  New types can be (re)introduced with the code which
> > > actually implements them.
> > ...
> > > -            0x0003: x86 PVH.
> > > -
> > > -            0x0004: ARM.
> > > -
> > > -            0x0005 - 0xFFFFFFFF: Reserved.
> > > +            0x0003 - 0xFFFFFFFF: Reserved.
> > This is reclaiming those numbers.
> Yes
>
> > Could there be any software which uses them ?
> Not plausibly, no, given...
>
> > Eg, maybe someone put the RFC series into production ?
> ... the rather large set of outstanding TODO items in IanC's RFC series,
> which included "the hypervisor is unstable when logdirty gets enabled" IIRC.
Some people after Ian picked up the work (AFAIK Linaro were the last 
ones), but yes the code was still an RFC even after that.
So I would not worry too much on potential use.

Cheers,

--
Julien Grall

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