Re: [Qemu-devel] Qemu 2.6 => Qemu 2.7 migration: error while loading state for instance 0x0 of device '0000:00:03.0/virtio-balloon'

[Dr. David Alan Gilbert]

* Stefan Priebe - Profihost AG (address@hidden) wrote:
> Hello,
> 
> today i did a first live migration from Qemu 2.6.2 to Qemu 2.7.0. The VM
> is running windows and virtio-balloon and with machine type pc-i440fx-2.5.
> 
> The output of the target qemu process was:
> kvm_apic_post_load: Yeh
> kvm_apic_post_load: Yeh
> kvm_apic_post_load: Yeh
> kvm_apic_post_load: Yeh
> kvm: VQ 2 size 0x80 < last_avail_idx 0x1 - used_idx 0x4
> kvm: error while loading state for instance 0x0 of device
> '0000:00:03.0/virtio-balloon'
> kvm: load of migration failed: Operation not permitted

Yes that's a known bug; only seems to affect windows guests, and I believe
doesn't even need to cross versions.

There's a bunch of fixes that Stefan applied to virtio code
that I think fix this; I see that he cc'd qemu-stable.
I think it's 4b7f91ed, but I'm not sure if there are others needed.

Dave
> 
> Greets,
> Stefan
> 
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK