On Tue, Apr 30, 2024 at 11:40:42AM +0200, Philippe Mathieu-Daudé wrote: > Hi Thomas, > > On 30/4/24 08:45, Thomas Huth wrote: > > Old machine types often have bugs or work-arounds that affect our > > possibilities to move forward with the QEMU code base (see for example > > https://gitlab.com/qemu-project/qemu/-/issues/2213 for a bug that likely > > cannot be fixed without breaking live migration with old machine types, > > or https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg04516.html or > > commit ea985d235b86). So instead of going through the process of manually > > deprecating old machine types again and again, let's rather add an entry > > that can stay, which declares that machine types older than 6 years are > > considered as deprecated automatically. Six years should be sufficient to > > support the release cycles of most Linux distributions. > > Thanks for taking that out of my plate :) > > IIRC 6 years was because of some old RHEL version, otherwise could > 5 years be enough? (maybe it could be good enough for this old RHEL > version as of QEMU v10.0). With my RHEL hat on, 6 years gives an approximate alignment with RHEL lifecycles, which have ended up being roughly 3 years apart. RHEL-N, wants to support all machine types from RHEL-(N-1), so in the worst case that gives up to 6 years worth of QEMU versions. 5 years could well be enough in many cases, depending on how frequently RHEL rebases QEMU, but could also trip us up if the timelines do something unexpected. So 6 years is a bit safer from Red Hat's POV, if the community is willing. > > Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx> > > --- > > docs/about/deprecated.rst | 11 +++++++++++ > > 1 file changed, 11 insertions(+) > > > > diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst > > index 6d595de3b6..fe69e2d44c 100644 > > --- a/docs/about/deprecated.rst > > +++ b/docs/about/deprecated.rst > > @@ -220,6 +220,17 @@ is a chance the code will bitrot without anyone noticing. > > System emulator machines > > ------------------------ > > +Versioned machine types older than 6 years > > +'''''''''''''''''''''''''''''''''''''''''' > > + > > +Starting with the release of QEMU 10.0, versioned machine types older than > > Why can't we start with QEMU 9.1? > > > +6 years will automatically be considered as deprecated and might be due to > > +removal without furthor notice. For example, this affects machine types like > > +pc-i440fx-X.Y, pc-q35-X.Y, pseries-X.Y, s390-ccw-virtio-X.Y or virt-X.Y where > > +X is the major number and Y is the minor number of the old QEMU version. > > +If you are still using machine types from QEMU versions older than 6 years, > > +please update your setting to use a newer versioned machine type instead. > > Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx> > With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| _______________________________________________ Devel mailing list -- devel@xxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxx
