Re: [PATCH for-9.0] docs/about: Mark the iaspc machine type as deprecated
On Wed, Mar 27, 2024 at 01:27:58PM +0000, Peter Maydell wrote:
On Wed, 27 Mar 2024 at 13:23, Daniel P. Berrangé
<berrange(a)redhat.com> wrote:
>
> On Wed, Mar 27, 2024 at 02:09:17PM +0100, Igor Mammedov wrote:
> > On Wed, 27 Mar 2024 10:49:43 +0000
> > Daniel P. Berrangé <berrange(a)redhat.com> wrote:
> > It's question of whether we are willing to do unthinkable,
> > i.e. to break QEMU <-> guest ABI for isapc case by removing
> > corresponding fwcfg entries.
>
> There has never been any ABI stability requirement for 'isapc'
> as it is not a versioned machine type.
>
> > With migration ignored it shouldn't be a problem.
> > Question is: does anyone care about migration with isapc?
> > If not, I'd gladly axe smbios legacy parts in 9.1
>
> Migration is irrelevant unless someone steps forward to
> commit to long term versioning of the machine type.
But migration is also how we implement savevm/loadvm,
which are useful even when the machine type is not versioned.
So please don't put in migration blockers or similar that would
break that.
Yep, that's valid use case within the scope of a single QEMU release.
We just can't guarantee it across versions. Often it'll probably work
but it is liable to break at times.
With regards,
Daniel
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