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Date: Mon, 06 Jul 2009 16:24:54 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] Re: [PATCH 0/4] Machine config files
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org

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.

cheers,
   Gerd