[Qemu-devel] [Bug 1185311] [NEW] could not hot-remove disabled NIC from Win2012 guest by 'devel_del id1'

[Amos Kong]

Public bug reported:

# qemu-latest-upstream -mon chardev=qmp,mode=control,pretty=on \
 -chardev socket,id=qmp,host=localhost,port=1234,server,nowait -vnc :0 \
 -monitor stdio /images/win2012-64-virtio.qcow2 \
 -device virtio-net-pci,netdev=ndev1,id=id1 -netdev tap,id=ndev1 \
 -device e1000,netdev=ndev2,id=id2 -netdev tap,id=ndev2 \
 -device rtl8139,netdev=ndev3,id=id3 -netdev tap,id=ndev3 \
 -smp 4 -m 3000 -usbdevice tablet

If disable nic in guest's "Network Connections" panel, nic could not be
hot-removed through qemu monitor.

1) if disable nic in guest
(qemu) devel_del id1 (nic still in "Network Connections". if enable nic, nic 
can work)
(qemu) devel_del id1
(qemu) devel_del id1

2) if enable nic in guest
(qemu) devel_del id1 (nic will be removed, disappear from "Network Connections")
(qemu) devel_del id1
Device 'id1' not found

Could not reproduced this problem with all linux guests & other Windows guests
Problem exists with virtio-nic/e1000/rtl8139, it seems the problem of 
pci-hotplug in piix4.

Could not reproduce this problem with Vmware + win2012 guest.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1185311

Title:
  could not hot-remove disabled NIC from Win2012 guest by 'devel_del
  id1'

Status in QEMU:
  New

Bug description:
  # qemu-latest-upstream -mon chardev=qmp,mode=control,pretty=on \
   -chardev socket,id=qmp,host=localhost,port=1234,server,nowait -vnc :0 \
   -monitor stdio /images/win2012-64-virtio.qcow2 \
   -device virtio-net-pci,netdev=ndev1,id=id1 -netdev tap,id=ndev1 \
   -device e1000,netdev=ndev2,id=id2 -netdev tap,id=ndev2 \
   -device rtl8139,netdev=ndev3,id=id3 -netdev tap,id=ndev3 \
   -smp 4 -m 3000 -usbdevice tablet

  If disable nic in guest's "Network Connections" panel, nic could not
  be hot-removed through qemu monitor.

  1) if disable nic in guest
  (qemu) devel_del id1 (nic still in "Network Connections". if enable nic, nic 
can work)
  (qemu) devel_del id1
  (qemu) devel_del id1

  2) if enable nic in guest
  (qemu) devel_del id1 (nic will be removed, disappear from "Network 
Connections")
  (qemu) devel_del id1
  Device 'id1' not found

  Could not reproduced this problem with all linux guests & other Windows guests
  Problem exists with virtio-nic/e1000/rtl8139, it seems the problem of 
pci-hotplug in piix4.

  Could not reproduce this problem with Vmware + win2012 guest.

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