[Qemu-devel] [Bug 1518969] Re: Instance of QEMU doesn't unplug virtio scsi disk after device_del and drive_del commands

[Michael liu]

Maybe  you detach disk too fast.When you detach disk,the guest os maybe
has not loaded the hotplug modules.So it can not detect your detach
event.Can you test the situation when detaching  disk after guest os
starting up ?

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https://bugs.launchpad.net/bugs/1518969

Title:
  Instance of QEMU doesn't unplug virtio scsi disk after device_del and
  drive_del commands

Status in QEMU:
  New

Bug description:
  device_del and drive_del commands don't cause virtio disk detaching

  Steps to reproduce:
  1. Run instance

  2. Attach virtio scsi disk

  3. Reboot instance

  4. Immediately after reboot detach disk with QEMU commands:
  device_del
  drive_del

  Expected result:
  Disk should be detached anyway

  Actual:
  Domain info contains attached disk even after waiting long period of time(5 
min in my case).

  Additional info:
  QEMU process:
  root     29010 42.6  1.9 562036 61272 ?        Rl   03:42   0:01 
/usr/bin/qemu-system-x86_64 -name instance-00000069 -S -machine 
pc-i440fx-trusty,accel=tcg,usb=off -m 64 -realtime mlock=off -smp 
1,sockets=1,cores=1,threads=1 -uuid d2418536-2547-4740-96b5-0d4f1d74b9f3 
-smbios type=1,manufacturer=OpenStack Foundation,product=OpenStack 
Nova,version=13.0.0,serial=1fd8f69a-909b-4ed1-aae9-4fc9318fc622,uuid=d2418536-2547-4740-96b5-0d4f1d74b9f3,family=Virtual
 Machine -no-user-config -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-00000069.monitor,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown 
-boot strict=on -kernel 
/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/kernel 
-initrd 
/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/ramdisk 
-append root=/dev/vda console=tty0 console=ttyS0 no_timer_check -device 
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive 
file=/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none
 -device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
 -drive 
file=/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/disk.config,if=none,id=drive-ide0-1-1,readonly=on,format=raw,cache=none
 -device ide-cd,bus=ide.1,unit=1,drive=drive-ide0-1-1,id=ide0-1-1 -netdev 
tap,fd=18,id=hostnet0 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:1a:10:3d,bus=pci.0,addr=0x3 
-chardev 
file,id=charserial0,path=/opt/stack/data/nova/instances/d2418536-2547-4740-96b5-0d4f1d74b9f3/console.log
 -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 
-device isa-serial,chardev=charserial1,id=serial1 -vnc 127.0.0.1:1 -k en-us 
-device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

  QEMU version:
  qemu-system-x86_64 --version
  QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.19), Copyright (c) 
2003-2008 Fabrice Bellard

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