On Thu, Aug 16, 2018 at 12:55 AM, Juergen Gross <jgr...@suse.com> wrote:
> On 16/08/18 08:51, Jan Beulich wrote: > >>>> On 16.08.18 at 08:32, <christopher.w.cl...@gmail.com> wrote: > >> On Wed, Aug 15, 2018 at 11:17 PM, Juergen Gross <jgr...@suse.com> > wrote: > >> > >>> In the Xen x86 community call we have been discussing whether anyone > >>> really is depending on 32-bit PV guests. We'd like to evaluate whether > >>> anyone would see problems with: > >>> > >>> - deprecating 32-bit PV guest support in Xen, meaning that we'd > >>> eventually switch to support 32-bit PV guests only via PV-shim from > >>> Xen 4.12 or 4.13 > >>> > >>> - dropping 32-bit PV support from upstream Linux kernel, resulting in > >>> current 32-bit PV guests no longer being able to upgrade to the > newest > >>> kernel version any longer > >>> > >>> And related to that: > >>> > >>> - is there any Linux distribution still shipping 32-bit PV-capable > >>> systems? > >>> > >>> - what about BSD? Is 32-bit PV support important there? > >> > >> Juergen - just to be very clear about the scope here: > >> * would this proposal affect the ability to use a 32-bit dom0? > > > > If the Dom0 is to be PV - yes, of course. For the time being there's > > no complete PVH Dom0 support, so if 32-bit is needed here, PV is > > for now indeed the only option. > ack. I asked because it's not necessarily obvious to all that dom0 is included in the term "guest", and it widens the consequences of this change. > > And to be more precise: the first step would be to remove 32-bit PV > support from upstream Linux kernel. This would result in the loss of > the ability to use a _new_ Linux (e.g. >= 4.20 / 5.0) as a 32-bit dom0. > A 32-bit dom0 using a kernel <= 4.19 would still work until we remove > 32-bit PV support from the hypervisor (which we wouldn't do before full > support of PVH dom0, I guess). > That makes sense. > > Is there a special reason you want to use a 32-bit dom0? > In short, no. OpenXT currently uses a 32-bit PV dom0, but work is already under way to migrate to 64-bit. I think your proposal is justified and good. Christopher
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