[Qemu-devel] [Bug 1354279] Re: The guest will be destroyed after hot remove the VF from the guest.

[chao zhou]

test on Ivytown_EP
kvm.git + qemu.git: c77dcacb_0e4a7737
kernel version: 3.16.0
after hot remove the VF from the guest, the guest works fine.

** Changed in: qemu
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1354279

Title:
  The guest will be destroyed after hot remove the VF from the guest.

Status in QEMU:
  Fix Committed

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):ia32e
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):Linux
  kvm.git Commit:9f6226a762c7ae02f6a23a3d4fc552dafa57ea23
  qemu.git Commit:5a7348045091a2bc15d85bb177e5956aa6114e5a
  Host Kernel Version:3.16.0-rc1
  Hardware:Romley_EP, Ivytown_EP,Haswell_EP

  
  Bug detailed description:
  --------------------------
  hot add the VF to the guest, then hot remove the VF from the guest, the guest 
will be destroyed.

  note:
  1. when hot add the VF with vfio, the hot remove the VF from the guest, the 
guest works fine.
  2. this shoule be a qemu bug:
  kvm       +   qemu    = result
  9f6226a7  +  5a734804 = bad
  9f6226a7  +  9f862687 = good


  Reproduce steps:
  ----------------
  1. create guest
  qemu-system-x86_64 --enable-kvm -m 1024 -smp 4 -net none rhel6u5.qcow 
-monitor pty
  2. hot add the vf to guest
  echo "device_add pci-assign,host=05:10.0,id=nic" >/dev/pts/x
  cat /dev/pts/x
  3. hot remove the VF froem guest
  echo "device_del nic" >/dev/pts/x

  Current result:
  ----------------
  the guest willl be destroyed after hot remove the VF from the guest

  Expected result:
  ----------------
  the guest works fine after hot remove the VF from the guest

  
  Basic root-causing log:
  ----------------------
  address@hidden qemu.git]# qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -net 
none rhel6u5.qcow -monitor pty
  VNC server running on `::1:5900'
  **
  ERROR:qom/object.c:725:object_unref: assertion failed: (obj->ref > 0)
  Aborted (core dumped)

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