Re: [PATCH v1 0/4] KVM: s390: Permit ESA mode guests in VSIE

Christoph Hellwig
2026-04-01T06:40:57Z

On Wed, Apr 01, 2026 at 04:09:11AM +0200, Eric Farman wrote:
> Hi Hendrik, Janosch, et al,
>
> Attached is a small series to allow ESA-mode guests in s390 VSIE.
> It continues to expect that z/Architecture is the default,
> unless opted in by userspace.
>
> I look forward to your thoughts; thanks!

What is the use case for this? Migrating existin VMs from 31-bit hosts
to 64-bit hosts?