Re: [Qemu-devel] Live migrate, inconsistent machine types - new machine type to fix?

[Amit Shah]

On (Tue) 22 Jul 2014 [14:12:00], Paolo Bonzini wrote:
> Il 22/07/2014 13:54, Amit Shah ha scritto:
> >> > a) because I'm using qemu-kvm-1.0, not qemu-1.0. You looked at qemu-1.0
> >> >    in the previous message; that's not directly relevant for what I'm
> >> >    looking at as my source is qemu-kvm-1.0 (qemu vs qemu-kvm).
> > Sigh; please read both my replies.
> > 
> > The only difference between qemu-kvm-1.0 and qemu-1.0 is the presence
> > of the pci-assign section in qemu-kvm-1.0.  All other output from
> > qemu-1.0 -> qemu-2.1 is equally applicable to qemu-kvm-1.0 ->
> > qemu-2.1.
> 
> Not really true.

Here's the complete output:

Section "xio3130-downstream" Description "xio3130-express-downstream-port": 
version error: 2 > 0
Section "usb-host" Section "usb-host" Description "usb-host": minimum version 
error: 0 < 1
Section "ich9-usb-ehci1" Section "ich9-usb-ehci1" Description "ehci": minimum 
version error: 0 < 1
Section "x3130-upstream" Description "xio3130-express-upstream-port": version 
error: 2 > 0
Section "usb-ehci" Section "usb-ehci" Description "ehci": minimum version 
error: 0 < 1
Section "ioh3420" Description "ioh-3240-express-root-port": version error: 2 > 0
Section "pci-assign" does not exist in dest
Section "PIIX4_PM" Section "PIIX4_PM" Description "piix4_pm": minimum version 
error: 2 < 3

> qemu 1.0 didn't have neither channels[0].irq_disabled nor flags and is
> version 2.
>
> qemu-2.1 has channels[0].irq_disabled and is version 3.
> 
> qemu-kvm-1.0 had flags, which is now called channels[0].irq_disabled,
> and is version 2.

Right - 'flags' here is renamed, and doesn't appear in that output;
but the src version was 0 according to the json output.

> qemu-2.1 loads version 2 as something that doesn't have
> channels[0].irq_disabled.  So it breaks if you feed it with qemu-kvm-1.0
> data.

OK - that's not something the static checker can flag, though..

> There's something similar going on with PIIX4_PM but I don't remember
> the details.

According to the output above, minimum version that qemu-2.1 accepts
changed to 3, and qemu-kvm-1.0 sends version 2.


                Amit