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Re: [Xen-devel] Future of 32-bit PV support
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Fri, 17 Aug 2018 06:10:18 +0200
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, bouyer@xxxxxxxxxx, "xen-users@xxxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 17 Aug 2018 04:10:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 16/08/18 19:34, Stefano Stabellini wrote:
> On Thu, 16 Aug 2018, Juergen Gross 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?
>
> Hi Juergen,
>
> Although I can see that deprecating 32-bit PV guest support is
> desirable, and it might not cause any problems to Linux and
> BSDs, we need to be careful about unikernels.
>
> There are probably unikernels out there that only support PV 32bit
> still. And why not? If you are designing a unikernel today, it would
> still make sense to use PV 32bit or PVH.
PVH will still work, of course. 32- and 64-bit.
Juergen
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