Re: [Qemu-devel] [Xen-devel] [XEN][RFC PATCH 14/15] xl-parsing: Parse the new option device_models

[Stefano Stabellini]

On Mon, 2 Apr 2012, Ian Jackson wrote:
> Julien Grall writes ("[Xen-devel] [XEN][RFC PATCH 14/15] xl-parsing: Parse 
> the new option device_models"):
> > For the support of multiple ioreq server, we add a new option 
> > "device_models".
> > It's an array of device model, for each device model, we need to specify
> > which pci, IO range (MMIO, PIO) will be allow.
> 
> I don't think this is really a suitable interface.  The PCI space in
> the guest is controlled by the device models(s) and the user should
> surely specify which devices should be provided by which dms, in terms
> of devices not in terms of PCI space.
 
Julien added a name parameter to select the device, maybe we need
something clearer?
Specifying the PCI address is important, because we have to make sure
the PCI addresses of the devices remain the same in a given VM across
multiple boots.
Thus we could make it optional from the user POV, but in that case we
need a clear, well defined and stable algorithm in xl to figure out a
PCI address from a given config file.