Re: [Xen-devel] PVH backports to 4.9 and 4.8

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, Jan 09, 2018 at 05:08:15PM +0000, George Dunlap wrote:
> Part of our solution to XSA-254 SP3 (aka "Meltdown") is to backport
> the PVH mode from 4.10 to 4.9 and 4.8.  This will first allow people
> able to run PVH kernels to switch their PV guests directly to PVH
> guests; and second, eventually enable the backport of patches which
> will enable transparent changing of PV guests into PVH guests.
> 
> All of the hypervisor support seems to have existed already in 4.8, so
> the only backports involve toolstack patches.

Thanks for looking into this.

My general opinion given those are toolstack only patches is that if
it works it's fine.

> I've put up two trees for a first-cut backport of the PVH
> functionality, to 4.9 and 4.8 here:
> 
> git://xenbits.xen.org/people/gdunlap/xen.git
> 
> Branches out/pvh-backport/4.8/v1 and out/pvh-backport/4.9/v1
> 
> Below are the patches backported from 4.10 to 4.9 (23 patches total):
> 
> Roger Pau Monne       libxl: add is_default checkers for string and timer_mode
> types
> Roger Pau Monne       libxl: introduce a way to mark fields as deprecated in
> the idl

This or one of the related patches is going to add fields in
domain_build_info, which will break the ABI. Is this expected/OK?

Roger.

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