Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities]

[Avi Kivity]

On 06/15/2009 12:08 PM, Mark McLoughlin wrote:
> > This last option makes sense to me: in a real world the user has
> > control over where he places the device on the bus, so why
> > not with qemu?
> >      
>
> Yep, most people seem to agree that it makes sense to allow this, but
> some believe it should only be via a machine description file, not the
> command line.
>    

I don't understand this opposition.  It's clear a machine config file is 
a long way in our future.  It's also clear lack of stable PCI addresses 
hurts us now.

> However, the first problem is that it isn't a solution to the guest ABI
> problem more generally.
>    

pci_addr was never meant to bring world peace, just stable PCI 
addresses.  The other issues should be addressed separately.

> And the second problem is that for e.g. libvirt to use it, it would have
> to be possible to query qemu for what PCI slots were assigned to the
> devices - libvirt would need to be able to parse 'info pci' and match
> the devices listed with the devices specified on the command line.
>    

If all devices (including vga, ide) are set up with pci_addr, then this 
is unneeded.  You do need to export available slot numbers from qemu.

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