migration failure in one direction

migration failure in one direction

[Matthew O'Connor]

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Hi!  I'm running into an issue with migrating VMs from machine A to
machine B (although migration works from B to A).  The issue is that
once the migration is complete and the VM is given the go-ahead to
continue execution, it spontaneously reboots.  With the version of
qemu-kvm shipped with Ubuntu 12.04 (qemu 1.0), it would freeze in BIOS. 
With qemu 1.4.1, it makes it through POST and restarts the operating
system.  So far I have been testing with Linux virtuals: two Ubuntu
12.04 images.  Migration consistently works perfectly from host B to
host A, but any migration (whether it be a clean boot-then-migrate, or a
migrate-back) from A to B experiences the above symptoms.

I have toyed with many options, but the behavior remains consistent.

Host A:
AMD Opteron 6272
QEMU v1.4.0-58-g57105f7
Kernel 3.8.12 (custom built)

Host B:
AMD Opteron 6172 (note - this is an older processor than what Host A
currently sports)
QEMU v1.4.0-58-g57105f7
Kernel 3.8.12 (custom built)

Virtual Info:
Ubuntu 12.04, kernel 3.2, 64-bit

Problem remains regardless of -no-kvm-irqchip switch.  Problem seems to
go away when NOT using the -enable-kvm switch.

Command-line:
LC_ALL=C
PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin
QEMU_AUDIO_DRV=none /usr/bin/qemu-system-x86_64 \
  -S  -sdl -qmp tcp:localhost:4444,server --monitor stdio \
  -M pc-0.14 \
  -m 4096 \
  -enable-kvm \
  -smp 1,sockets=1,cores=1,threads=1 -no-kvm-pit \
  -name qb.team \
  -uuid e8a71bd3-1b72-ce09-b8b1-97bed859d534 \
  -nodefaults \
  -rtc base=utc \
  -no-shutdown \
  -boot cd \
  -drive
file=/opt/store3/vm/qb.team/qb.team_root.qcow2,if=none,id=drive-virtio-disk0,format=qcow2
\
  -device
virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 \
  -drive if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw \
  -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
  -netdev tap,id=hostnet0 \
  -device rtl8139,netdev=hostnet0,id=net0,mac=00:00:00:00:00:00 \
  -usb \
  -vga cirrus \
  -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

Thanks for your help!
-- Matthew

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