Re: [Xen-devel] [PATCH 00/22] Vixen: A PV-in-HVM shim

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

Wei Liu writes ("Re: [Xen-devel] [PATCH 00/22] Vixen: A PV-in-HVM shim"):
> On Mon, Jan 08, 2018 at 08:02:07AM -0800, Anthony Liguori wrote:
> > OTOH, the HVM version of the series requires no tools changes and
> > works on Xen versions going back to 3.4 (at least).

That depends, I think, on how you are selecting the guest kernel.

libxl (at least, older libxls) don't support direct kernel boot in HVM
mode.  So if you were using kernel= in your config file that won't
work without libxl changes which are really hard to do and also
maintain ABI compatibility.

Likewise bootloader= (eg bootloader="pygrub").

> > If it was entirely my call, I would work on merging HVM shim
> > first, get a 4.10 stable release cut with it, and then focus on
> > getting PVH shim in place for the 4.11 release.  I think this is
> > the right balance of addressing the short term needs while also
> > having the best long term solution.
> 
> Not my call either. I will wait for security team member and stable tree
> maintainers to weight in.

Since shim users are going to be using unstable/4.10 as the shim
anyway, I think a good priority is indeed getting a good solution for
4.10.

Personally I am not doing any Xen review work or commit work right now
that is not related to Meltdown/Spectre.  Everything else has to wait.

Furthermore I think we should avoid committing anything to
xen-unstable that will complicate our efforts on the shim.

Ian.

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