Re: [Qemu-devel] Re: [PATCH 0/4] Machine config files

[Michael S. Tsirkin]

On Mon, Jul 06, 2009 at 04:24:54PM +0200, Gerd Hoffmann wrote:
> On 07/06/09 15:56, Michael S. Tsirkin wrote:
>> On Mon, Jul 06, 2009 at 03:43:23PM +0200, Gerd Hoffmann wrote:
>>> On 07/06/09 14:49, Michael S. Tsirkin wrote:
>>>> On Fri, Jun 12, 2009 at 06:11:24PM +0200, Jan Kiszka wrote:
>>>> Can't we extend loadvm/savevm format to support machine config? It is
>>>> already supported by all devices, it seems that we just need to add some
>>>> detail such as pci addresses, and qemu flags to save/load this config.
>>>> No?
>>> No.  Adding some info to the devices doesn't cut it as you also need to
>>> know which devices are present in the first place.
>>
>> Actually at least for pci devices you have the devid/vendor id
>> register - from this you can know which devices are present.
>
> Doesn't help you.  You can't easily pull out that information from the  
> savevm file.  And even it you could you still don't know which backend  
> actually drives that piece of hardware.

How hard is it to add a fixed size backend id before each device?

-- 
MST