Re: [Qemu-devel] sending pci information over the wire

[Glauber Costa]

On Thu, Jun 18, 2009 at 03:03:21PM -0500, Anthony Liguori wrote:
> Glauber Costa wrote:
>> Hi folks,
>>
>> I have some trial code here for a proposal, which I'd like to hear your
>> opinions about (Well, I _had_, because I'm totally stupid and git reset'd 
>> --hard
>> the wrong location, that happened to contain part of the code for it)
>>
>> Let me start by explaining what I'm trying to accomplish, and say that I 
>> myself
>> am not sure this is the best approach, it is just a crazy idea that poped up.
>>
>> Right now, migration of pci devices work by a bit of luck. This is because 
>> the
>> other side of the wire can enumerate the devices in a different order, 
>> causing
>> them to end up at different addresses. Markus approach of pci_addr= patches
>> do help that fact. 
>>
>> However, theoretically, there can be a case in which we:
>>  * start receiving guest, with parameters determined by pci_addr=
>>  * start live migration
>>  * add a device.
>>   
>
> Once we have a machine config (and please, let's avoid the 2017 jokes  
> please), I imagine that the machine config will be transferred as a  
> non-live section.
>
> That will solve this problem quite nicely.
Sure.

Question is, whether or not there is any value in doing this now.
I may argue that this could raise issues early, and the rework needed
to make it work can pave the way for a machine config, making things
easier for it.

Or maybe not.