[Bug 1641532] Re: Unknown ramblock "/rom at etc/acpi/rsdp", cannot accept migration

[ChristianEhrhardt]

ATM - I can't think of a really good way out.
We can fix X/Y/Z releases to expect the "correct" types when seeing the old machine-types.
On top one would have to to the same for all qemus in UCA.

But everybody that had (re)-started a guest "in between" with a newer
qemu - think of Ubuntu Cloud Archive that can give Trusty all varieties
of Qemu - might have a different version on his guests.

Trying to summarize:
- Affected machine types: trusty and utopic
- Effect: those types are not non-ambiguous, they can be any hw_version from 2.0-2.5 depending on 
  under which qemu they were started last time.

Status today - a migration forward fails in some combinations but not in others.
- Trusty as-is (2.0) to Xenial works even with the bug in place.
- Trusty + UCA-Liberty (2.3) to Xenial fails due to the issue.
- other combinations have to be evaluated

Fixing the types to the "correct" ones will fix anybody that never has restarted the guests.
But it might break those that have restarted guests as they have accidentally picked up a too new guest type.

** Changed in: qemu (Ubuntu)
       Status: New => Confirmed

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Critical

** Summary changed:

- Unknown ramblock "/rom at etc/acpi/rsdp", cannot accept migration
+ machine-types trusty and utopic are not unique (depend on the qemu version)

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https://bugs.launchpad.net/bugs/1641532

Title:
  machine-types trusty and utopic are not unique (depend on the qemu
  version)

Status in Ubuntu Cloud Archive:
  New
Status in qemu package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  I'm currently live-migrating many VMs from an old server to a new one,
  and some VM can't be live migrated.

  The source host is trusty with qemu-system-x86 1:2.3+dfsg-5ubuntu9.4~cloud2
  The destination host is xenial with qemu-system-x86 1:2.5+dfsg-5ubuntu10.6

  When the issue occurs, the destination host raises an error [1] and
  stop the migration process.

  The only difference I see between VMs where live migration works and
  those were it doesn't work is a different machine type.

  * migration works when VM have been created with pc-i440fx-vivid
  * migration doesn't work when VM have been created with pc-i440fx-utopic

  [1] the qemu error report by libvirt on the destination host

  2016-11-14 08:25:40.774+0000: starting up libvirt version: 1.3.1, package: 1ubuntu10.5 (Stefan Bader <stefan.bader at canonical.com> Thu, 06 Oct 2016 13:07:20 +0200), qemu version: 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.6), hostname: n7.tetaneutral.net
  LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin QEMU_AUDIO_DRV=spice /usr/bin/kvm-spice -name a81e7133-9601-4432-86dd-a2401dcad8c2 -S -machine pc-i440fx-utopic,accel=kvm,usb=off -cpu Nehalem -m 256 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid a81e7133-9601-4432-86dd-a2401dcad8c2 -smbios 'type=1,manufacturer=OpenStack Foundation,product=OpenStack Nova,version=2015.1.2,serial=fe2641d2-543a-4d65-b75f-6337bf4b8744,uuid=a81e7133-9601-4432-86dd-a2401dcad8c2' -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-a81e7133-9601-4432-86dd-a2401dcad8c2/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive 'file=rbd:disks/a81e7133-9601-4432-86dd-a2401dcad8c2_disk.config:id=openstack-service:key=XXXXXXXXXXXX==:auth_supported=cephx\;none:mon_host=192.168.99.251\:6789\;192.168.99.252\:6789\;192.168.99.253\:6789,format=raw,if=none,id=drive-ide0-1-1,readonly=on,cache=none,aio=native' -device ide-cd,bus=ide.1,unit=1,drive=drive-ide0-1-1,id=ide0-1-1 -drive 'file=rbd:disks/volume-a82bb407-5ccb-4b0e-ba68-a0de1cd58cc3:id=openstack-service:key=XXXXXXXXXXXXXXXXXX:auth_supported=cephx\;none:mon_host=192.168.99.251\:6789\;192.168.99.252\:6789\;192.168.99.253\:6789,format=raw,if=none,id=drive-virtio-disk0,serial=a82bb407-5ccb-4b0e-ba68-a0de1cd58cc3,cache=none,aio=native' -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=43,id=hostnet0,vhost=on,vhostfd=45 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:37:fb:ba,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/var/lib/nova/instances/a81e7133-9601-4432-86dd-a2401dcad8c2/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -device usb-tablet,id=input0 -spice port=5916,addr=0.0.0.0,disable-ticketing,seamless-migration=on -k en-us -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=16,bus=pci.0,addr=0x2 -incoming defer -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on
  2016-11-14T08:25:44.216364Z qemu-system-x86_64: Unknown ramblock "/rom at etc/acpi/rsdp", cannot accept migration
  2016-11-14T08:25:44.216394Z qemu-system-x86_64: error while loading state for instance 0x0 of device 'ram'
  2016-11-14T08:25:44.216509Z qemu-system-x86_64: load of migration failed: Invalid argument

  Cheers,

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