Re: [Qemu-devel] [Crucial bug] Qemu-2.0.0 do not support virtio-net hot plug/unplug exceed two times

[Gonglei (Arei)]

Hi,

> > > Il 26/04/2014 10:56, Gonglei (Arei) ha scritto:
> > > > Public bug reported:
> > > >
> > > > I want to repeated hot-plug/unplug the virtio-net in the latest qemu
> > > upstream
> > > > (commit 839a5547574e57cce62f49bfc50fe1f04b00589a), but I am failed
> at
> > > the
> > > > second time hot plug the virtio-net to guest.
> > > >
> > > > Then I tried to use Qemu-2.0.0 release version, but I got the error too.
> > > >
> > > > Cmdline for vm:
> > > >
> > > > /mnt/sdb/gonglei/qemu/x86_64-softmmu/qemu-system-x86_64
> -enable-kvm
> > > -m 4096 -smp 4 -name sles-et -boot c -drive file=/mnt/sdb/gonglei/image/
> > > sles-3.img -vnc 0.0.0.0:10 -monitor stdio
> > > > QEMU 1.7.50 monitor - type 'help' for more information
> > >
> > > For commit 839a5547574e57cce62f49bfc50fe1f04b00589a you should have
> > > gotten 1.7.90 as the version number.
> > >
> > Maybe just because Peter Maydell merge remote-tracking branch. But it
> doesn't matter.
> >
> > > > (qemu) device_add virtio-net-pci,id=net1
> > > > (qemu) device_del net1
> > > > (qemu) device_add virtio-net-pci,id=net1
> > > > Duplicate ID 'net1' for device
> > > > (qemu)
> > >
> > > I cannot reproduce this on Fedora running the 2.0.0 package from the
> > > virt-preview repository (qemu-system-x86-2.0.0-2.fc20.x86_64).
> > >
> > > For what it's worth, I get this for --version:
> > >
> > > $ qemu-system-x86_64 --version
> > > QEMU emulator version 2.0.0, Copyright (c) 2003-2008 Fabrice Bellard
> > >
> > > and likewise, when starting QEMU with "-monitor stdio":
> > >
> > > QEMU 2.0.0 monitor - type 'help' for more information
> > >
> > I got the QEMU 2.0.0 version from http://wiki.qemu.org/Download
> >
> > The issue was reproduced perforce:
> > UVP:/mnt/sdb/gonglei/code/qemu-2.0.0/x86_64-softmmu
> #./qemu-system-x86_64 -enable-kvm -m 4096 -smp 4 -name sles \
> >  -boot c -drive file=/mnt/sdb/gonglei/image/sles-3.img -vnc 0.0.0.0:10
> -monitor stdio
> > QEMU 2.0.0 monitor - type 'help' for more information
> > (qemu) device_add virtio-net-pci,id=net1
> > (qemu) device_del net1
> > (qemu)  device_add virtio-net-pci,id=net1
> > Duplicate ID 'net1' for device
> > (qemu)
> >
> > Anything wrong? Thanks!
> 
> Issue confirmed with both -monitor and qmp-shell with different other device
> models like e1000.

Thanks. This issue confused me two weeks now, any helps will be appreciated.

Cc'ing Peter and Michael for additional insights.


Best regards,
-Gonglei