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[Qemu-devel] [Bug 1603970] Re: KVM freezes after live migration (AMD 418


From: Kilian Ries
Subject: [Qemu-devel] [Bug 1603970] Re: KVM freezes after live migration (AMD 4184 -> 4234)
Date: Mon, 18 Jul 2016 15:30:02 -0000

Found another post from a user in the proxmox forum which has a similar
problem (only difference are the CPUs in use):

https://forum.proxmox.com/threads/vm-freezeing-with-vcpu-at-100-when-
doing-livemigration.25987/

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https://bugs.launchpad.net/bugs/1603970

Title:
  KVM freezes after live migration (AMD 4184 -> 4234)

Status in QEMU:
  New

Bug description:
  Hi,

  i have two host systems with different CPU types:

  Host A:
  AMD Opteron(tm) Processor 4234

  Host B:
  AMD Opteron(tm) Processor 4184

  Live migration from B -> A works as expected, migration from A -> B
  always ends in a freezed KVM. If the KVM is frozen, VNC output is
  still present, however, you can't type anything. CPU usage is always
  at 100% for one core (so if i set two cores, one is at 100% the other
  one at 0% usage).

  My command to launch the KVM is the following:

  /usr/bin/kvm -id 104 -chardev socket,id=qmp,path=/var/run/qemu-
  server/104.qmp,server,nowait -mon chardev=qmp,mode=control -pidfile
  /var/run/qemu-server/104.pid -daemonize -smbios
  type=1,uuid=26dd83a9-b9bd-4641-8016-c55f255f1bdf -name kilian-test
  -smp 1,sockets=1,cores=1,maxcpus=1 -nodefaults -boot menu=on,strict=on
  ,reboot-timeout=1000 -vga cirrus -vnc unix:/var/run/qemu-
  server/104.vnc,x509,password -cpu
  kvm64,+lahf_lm,+sep,+kvm_pv_unhalt,+kvm_pv_eoi,enforce -m 512 -object
  memory-backend-ram,id=ram-node0,size=512M -numa
  node,nodeid=0,cpus=0,memdev=ram-node0 -k de -device pci-
  bridge,id=pci.2,chassis_nr=2,bus=pci.0,addr=0x1f -device pci-
  bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e -device piix3-usb-
  uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device usb-
  tablet,id=tablet,bus=uhci.0,port=1 -device virtio-balloon-
  pci,id=balloon0,bus=pci.0,addr=0x3 -iscsi initiator-
  name=iqn.1993-08.org.debian:01:5ca1e9d334b2 -drive
  file=/mnt/pve/nfs_synology/images/104/vm-104-disk-2.qcow2,if=none,id
  =drive-virtio0,format=qcow2,cache=none,aio=native,detect-zeroes=on
  -device virtio-blk-pci,drive=drive-
  virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100 -netdev
  type=tap,id=net0,ifname=tap104i0,script=/var/lib/qemu-server/pve-
  bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on -device
  virtio-net-
  
pci,mac=66:33:31:36:35:36,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300

  
  KVM / QEMU version: QEMU emulator version 2.5.1.1

  I have tried to set different CPU types, but no one works (qemu64,
  vm64, Opteron_G1, ...).

  
  I have found an email from 2014 where another user reports exactly the same 
problem:

  http://lists.gnu.org/archive/html/qemu-discuss/2014-02/msg00002.html

  Greets
  Kilian

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