Re: [RFC PATCH 0/2] Fix cross migration issue with missing features: pdcm, arch-capabilities

[Hector Cao <hector.cao@canonical.com>]

[-- Attachment #1: Type: text/plain, Size: 2029 bytes --]

Thanks Paolo,

Is it still time for me to submit the v2 of this patch ? I would like do
add 2 changes:
- add fixes:xxx line suggested by Daniel
- fix link error for qemu-user build (since it has no access to migration
code)

Best,
Hector

<https://launchpad.net/~hectorcao>

Le mar. 23 sept. 2025, 09:53, Paolo Bonzini <pbonzini@redhat.com> a écrit :

> On 9/10/25 13:57, Hector Cao wrote:
> > Hello,
> >
> > Since it is a blocking issue for us, we went further and ended up with a
> solution along [1]
> > that allows us to get out of this situation.
> >
> > The idea is to add compatibility properties to restore legacy behaviors
> for machine types
> > with older versions of QEMU (<10.1). 2 compatiblity properties have been
> added to address
> > respectively the 2 missing features, each one is done in a separate
> patch.
> >
> > We know that 10.1 has been released and it's final, but working on a
> solution towards 11.0
> > would allow everyone to settle on the fix and even consider backporting
> where not yet released
> > like Ubuntu 25.10 for us.
>
> Thanks, I have applied the patch.  It's better to have the fix in 10.1.1.
>
> Sorry for the delay, I was on vacation for one week and working reduced
> hours the next.
>
> Paolo
>
> > It is important to have upstream support going forward in this or any
> other way
> > and therefore reach out with this RFC to ask you to think about it with
> us.
> >
> > [1]
> https://gitlab.com/qemu-project/qemu/-/blob/master/docs/devel/migration/compatibility.rst
> >
> > Hector Cao (2):
> >    target/i386: add compatibility property for arch_capabilities
> >    target/i386: add compatibility property for pdcm feature
> >
> >   hw/core/machine.c     |  2 ++
> >   migration/migration.h | 23 +++++++++++++++++++++++
> >   migration/options.c   |  6 ++++++
> >   target/i386/cpu.c     | 17 ++++++++++++++---
> >   target/i386/kvm/kvm.c |  5 ++++-
> >   5 files changed, 49 insertions(+), 4 deletions(-)
> >
>
>

[-- Attachment #2: Type: text/html, Size: 3127 bytes --]