Re: [Xen-users] How to create PVHv2 DomU?

[George Dunlap <dunlapg@xxxxxxxxx>]

On Tue, Jan 16, 2018 at 7:26 PM,  <who.are.you@xxxxxxxxx> wrote:
>
> I'm not the first to notice, but to summarise: after the 4.9.0-5 kernel 
> update, `pvh=1` in a Xen configuration file now causes Debian 9 DomUs to fail 
> to boot.
>
> According to the xen-devel list, this is intentional:
> https://lists.xenproject.org/archives/html/xen-devel/2018-01/msg00540.html
>
> The above link states it's because `pvh=1` was based on the 'tech preview' of 
> PVH, version 1.
> Allegedly there is some kind of PVH version 2 that is coming into effect.
>
> I can't find any information on how to actually use PVH version 2.
>
> Does anyone know how to build an image, convert an image, or whatever, to 
> actually use PVH version 2?
> It seems quite critical given the latest vulnerabilities, but it seems 
> unclear as to how to actually use it.

For PVH version 2 you need Linux support and hypervisor support.  I
believe the earliest version of Linux that had PVHv2 support was 4.11.
The earliest version of Xen that had somewhat useable "tech preview"
PVHv2 support was probably 4.8.  The first version of Xen that
officially supported PVHv2 was 4.10; the XenProject Security Team have
backported full PVH support to Xen 4.8 via the "Comet" branch.

 -George

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