[Qemu-devel] [Bug 913774] Re: device can't be hot-removed from the guest

[Yongjie Ren]

** Attachment added: "host dmesg log"
   
https://bugs.launchpad.net/qemu/+bug/913774/+attachment/2664196/+files/dmesg-host.log

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https://bugs.launchpad.net/bugs/913774

Title:
  device can't be hot-removed from the guest

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64): ia32e
  Guest OS (ia32/ia32e/IA64): ia32e
  Guest OS Type (Linux/Windows): Linux(RHEL6u1)
  kvm.git Commit:  ff92e9b5571b34f53cbfde0899cf6e6a579cb3fa
  qemu-kvm Commit: aad3b517a1b83561f2755dc4451596a421399c19
  Host Kernel Version: 3.2.0-rc7
  Hardware: Romley-EP, WSM-EP

  
  Bug detailed description:
  --------------------------
  Using the latest qemu-kvm and kvm upstream, PCI device can't be hot-removed 
from the guest.
  I try to remove a VF, but the device can't be removed. The VF in guest still 
has IP, and its network is fine.
  A normal NIC will have the same issue.
  From my test, this should be a qemu-kvm bug.
  kvm      + qemu-kvm    =  result
  ff92e9b5 + aad3b517 =  bad 
  ff92e9b5 + fcfeed4a   =  good

  some logs are attached.

  Reproduce steps:
  ----------------
  1. start up a host with kvm(commit: ff92e9b5) and use 
qmeu-kvm(commit:aad3b517 )
  2. qemu-system-x86_64 -m 512 -smp 1 –hda /root/rhel6u1.img
  3. ctrl+Alt+2  (switch to monitor)
  4. device_add pci-assign,host=09:10.0,id=nic   (hot-add a VF)
  5. ctrl+Alt+1
  6. check the device can get IP
  7. ctrl+Alt+2
  8. device_del nic     (try to detach the VF)

  
  Current result:
  ----------------
  Cannot hot-remove the device.

  Expected result:
  ----------------
  The device can be hot-removed.

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