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

[George Dunlap <dunlapg@xxxxxxxxx>]

On Wed, Feb 28, 2018 at 6:38 PM, Hans-Joachim Kliemeck <info@xxxxxxxxxxx> wrote:
>
> George Dunlap:
>
> /On 01/23/2018 04:06 AM, Simon Gaiser wrote:/
> /> George Dunlap:/
> />> 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./
> />>/
> />> 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):/
> /> [...]/
> />/
> /> So future 4.8 releases will include the backports, right? Asking because/
> /> the AFAICS the 4.8.3-pre-shim-comet branch include them but staging-4.8/
> /> does not./
> //
> /Some of us have had informal conversations about backporting PVH and/
> /Comet host/toolstack patches to 4.8, and a number of us think it's a/
> /good idea, but we haven't had an official discussion with all the/
> /stakeholders yet. We'll come back to it once more of the fires have/
> /been put out./
> //
> /Feel free to remind us in a month or so if you still haven't seen any/
> /patches in the stable-4.8 branch. :-)/
>
> Ok, thank you for the quick reply. In Qubes we are using PVH with 4.8
> using the old device_model_version=none config option. And changing this
> would be much easier before release (So the change should be in our rc
> now). Anyway if it's not decided yet, we will have to guess what ends up
> in future 4.8.z releases.
>
>
>
> Hi,
>
> is there an update for the backports for 4.8 and 4.9? Or is there some
> documentation available to see which parts are missing on 4.9 vs 4.10 (or
> 4.8 vs 4.10) to get PVH running (device_model_version=none, ...)?

[CC'ing some more people]

Have we come to any firm conclusion about backported PVH functionality for 4.8?

I'd be in favor of merging the 4.8.3pre-shim-comet and
4.10.0-shim-comet branches into staging-4.8 and staging-4.10
respectively (assuming that's suitable).  Are there any other fixes to
PVH / PVshim hosting that we'd need to backport as well?

 -George

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel