On 22 Jul 2014, at 19:43, Alex Bligh <a...@alex.org.uk> wrote: > I have not (yet) brought forward the qxl rom size (and possibly > video ram) changes in Cole's patches as I'd prefer an assessment > of whether this is the right approach first.
Whilst vga=cirrus, and vga=none I appear to be able to get to work, I suspect the QXL problem is unfixable. The symptom on import is: Unknown ramblock "0000:00:02.0/virtio-net-pci.rom", cannot accept migration A little debugging and this shows that the expected RAM blocks on load are (just looking at the ones starting 0000:00): 0000:00:02.0/qxl.vram 0000:00:02.0/qxl.rom 0000:00:03.0/virtio-net-pci.rom 0000:00:02.0/qxl.vrom note the 03 in virtio-net-pci.rom, not an 02. Looking at the migrated file (from qemu-kvm-1.0 with a pc-1.0 machine type) with 'strings', I see: 0000:00:02.0/virtio-net-pci.rom 0000:00:00.0/I440FX 0000:00:01.0/PIIX3 0000:00:02.0/virtio-net 0000:00:01.1/ide 0000:00:01.2/uhci 0000:00:01.3/piix4_pm 0000:00:03.0/virtio-blk A migrated file (from qemu 2.0 with a pc-1.0-qemu-kvm machine type) has 0000:00:02.0/qxl.vram 0000:00:03.0/virtio-net-pci.rom 0000:00:02.0/qxl.rom 0000:00:02.0/qxl.vrom 0000:00:00.0/I440FX 0000:00:01.0/PIIX3 0000:00:02.0/qxl 0000:00:03.0/virtio-net 0000:00:01.1/ide 0000:00:01.2/uhci 0000:00:01.3/piix4_pm 0000:00:04.0/virtio-blk The symptom is the result of the assignment of device number 03 to virtio-net, as (it would seem) qxl does not actually have a pci device id in qemu-kvm-1.0 (or at least not one making it to migration); I'm assuming the names are PCI BDF. Hence virtio-net is getting device ID 02 not 03. QXL does appear to migrate qemu-kvm-1.0 to qemu-kvm-1.0. I'm guessing that once upon a time QXL was not a PCI device, but it is now. For once I don't think Cole Robinson's patch is going to help here as this seems to be handling QXL rom size mismatches between 8k and 16k, and the QXL romsize (on both ubuntu 12.04 and 14.04 is well over 32k) so that looks like not the issue. I suspect QXL on qemu-kvm-1.0 is a bit niche anyway. -- Alex Bligh
