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[Qemu-devel] Re: Qemu-KVM Livate Migration 0.12.2 -> 0.12.3/4 broken?

From: Avi Kivity
Subject: [Qemu-devel] Re: Qemu-KVM Livate Migration 0.12.2 -> 0.12.3/4 broken?
Date: Sun, 16 May 2010 17:47:46 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4

On 05/16/2010 05:42 PM, Juan Quintela wrote:

Any idea why it fails?  And how to fix it?
Lack of "proper" subsections.  IDE is something like:

const VMStateDescription vmstate_ide_drive = {
     .version_id = 4,

static const VMStateDescription vmstate_bmdma = {
     .name = "ide bmdma",
     .version_id = 4,

const VMStateDescription vmstate_ide_pci = {
     .name = "ide",
     .version_id = 4,
         VMSTATE_STRUCT_ARRAY(bmdma, PCIIDEState, 2, 0,
                      vmstate_bmdma, BMDMAState),
         VMSTATE_IDE_DRIVES(bus[0].ifs, PCIIDEState),
         VMSTATE_IDE_DRIVES(bus[1].ifs, PCIIDEState),

Notice that everything is at version 4.  It used to be everything at
version 3.  Now the problem is that when migrating from v3 ->  v4.  We
put in one place v3, But we only have a version number at the toplevel,
rest of "subsections" don't sent a version number.  There is no way to
fix it in the general case.  We can hack something around for ide, but
that will just be a hack, or we can backport marcelo change and port it
as a proper subsection (that is my plan).  I expect to have time at the
end of next time to work on this.

end of next week?

So, to make the story short: I know what is happening, and I know how to
fix it, just that fix is not trivial.  I just need time.

Meanwhile, we have a broken 0.12.4. Is there a quick'n'dirty workaround that will be forward compatible with the real fix that we can push out?

We've regressed from failing some migrations to failing all migrations.

error compiling committee.c: too many arguments to function

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