Re: [Qemu-devel] Deprecating old machine-types (was Re: [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type)

[Paolo Bonzini]

On 10/10/2016 19:46, Eduardo Habkost wrote:
> I don't think we have a plan, but I would support deprecating and
> removing very old machine-types. The question is: how old is too
> old?
> 
> For reference, the commits and dates when each machine-type was
> added are below:
> 
> machine   commit    commit date  release  release date
> pc-0.10   e8b2a1c6  Jul 8 2009   v0.11.0  Sep 22 2009
> pc-0.13   95747581  Jul 22 2009  v0.12.0  Dec 19 2009
> pc-0.12   2cae6f5e  Jan 8 2010   v0.13.0  Oct 14 2010
> pc-0.13   d76fa62d  Feb 15 2010  v0.13.0  Oct 14 2010
> pc-0.14   b903a0f7  Nov 11 2010  v0.14.0  Feb 16 2011
> pc-0.15   ce01a508  Dec 18 2011  v1.1.0   Jun 1 2012
> pc-1.0    19857e62  Nov 7 2011   v1.0     Dec 1 2011
> pc-1.1    382b3a68  Feb 21 2012  v1.1.0   Jun 1 2012
> pc-1.2    f1dacf1c  Jun 11 2012  v1.2.0   Sep 5 2012
> pc-1.3    f4306941  Sep 13 2012  v1.3.0   Dec 3 2012

Anything before pc-1.3 has issues with migration due to the introduction
of the memory API.  Basically, 0xf0000-0xfffff is not migrated
correctly, and the result is that rebooting after migration causes the
guest to crash.  So that could be a reasonable place to draw the line at.

Paolo