From: Michael Roth <mdroth@linux.vnet.ibm.com>
To: Bharata B Rao <bharata.rao@gmail.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Igor Mammedov <imammedo@redhat.com>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] Unable to add ram object with same ID after addition, migration and removal at the target
Date: Mon, 05 Dec 2016 00:44:53 -0600 [thread overview]
Message-ID: <20161205064453.3996.48049@loki> (raw)
In-Reply-To: <CAGZKiBrebbEy9pfWCmN_ztmQZ5gNUZ5Ho_J-oOtyhrYSQPi91A@mail.gmail.com>
Quoting Bharata B Rao (2016-12-04 21:51:32)
> On Fri, Dec 2, 2016 at 11:46 PM, Dr. David Alan Gilbert <dgilbert@redhat.com>
> wrote:
>
> * Bharata B Rao (bharata.rao@gmail.com) wrote:
> > Hi,
> >
> > - Add ram object and dimm device at the source
> >
> > (qemu) object_add memory-backend-ram,id=ram0,size=128M
> > (qemu) device_add pc-dimm,id=dimm0,memdev=ram0
> >
> > - Migrate the VM and remove the dimm device and ram object at the target
> >
> > (qemu) device_del dimm0
> > (qemu) object_del ram0
> >
> > - Adding the ram object with same id now at the target fails like this:
> >
> > (qemu) info memdev
> >
> > (qemu) object_add memory-backend-ram,id=ram0,size=128M
> > Duplicate ID 'ram0' for object
> >
> > Same behaviour is seen on x86 and Power. The problem isn't seen if
> > migration isn't involved (add, remove, add at the source itself).
>
> Is this the same as the one Michael Roth posted a fix for a few days
> back; 'monitor: fix object_del for command-line-created objects'
>
> https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg05479.html
>
>
> Yes, this is same as above, I hadn't noticed Michael's fix.
>
> Will be good to have this fix in 2.8.
I considered shooting for 2.8, but since it's only triggerable with HMP
(QMP doesn't use the QemuOpts-based parsing so it doesn't hit the
duplicate ID error, so libvirt in turn would be uneffected), and doesn't
seem to be a regression (AFAICT it's been an issue since object_del was
introduced), I figured it could wait till 2.9/2.8.1.
Definitely a pain for testing though...
>
> Regards,
> Bharata.
next prev parent reply other threads:[~2016-12-05 6:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-02 3:25 [Qemu-devel] Unable to add ram object with same ID after addition, migration and removal at the target Bharata B Rao
2016-12-02 18:16 ` Dr. David Alan Gilbert
2016-12-05 3:51 ` Bharata B Rao
2016-12-05 6:44 ` Michael Roth [this message]
2016-12-05 23:02 ` David Gibson
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