Re: [Qemu-devel] [PATCH 2/2] migration: send and check the devices between source and distination at the begining

[Li Zhijian]

On 09/30/2016 02:15 PM, Amit Shah wrote:
> Hi,
>
> On (Thu) 29 Sep 2016 [19:06:32], Li Zhijian wrote:
> > Priviously, if the source and distination have different devices, source could 
> > goto
> > the status "paused (postmigrate)", and the distination will exit that means no 
> > qemu
> > is alive.
> >
> > After this patch, at above case, source can dectect the some error early from 
> > distination
> > and stop the migration, source keep in status "running".
>
> How would incoming migrations from previous versions work?

You are right. we need to consider more.

How about that:
we need to introduce a new section type(e.g: QEMU_VM_SECTION_DEVICE_LIST).

source side:
- at the beginning of qemu_savevm_state_begin(), send 
QEMU_VM_SECTION_DEVICE_LIST first
- original path

dst side:
- if we got the QEMU_VM_SECTION_DEVICE_LIST, have a check with the 
devices(name,version)
- otherwise original path

Please correct me.

Thanks
Zhijian

>                 Amit