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

[Ian Jackson]

Stefano Stabellini writes ("Re: [Xen-devel] [XEN][RFC PATCH 14/15] xl-parsing: 
Parse the new option device_models"):
> On Tue, 3 Apr 2012, Ian Jackson wrote:
> > Currently the bdfs are allocated by the single qemu-dm, right ?  Why
> > cannot that functionality stay there, with the pci bridge emulation ?
>  
> Because the allocation of most BDFs in QEMU is done ad-hoc in a first
> come first served basis. If the first QEMU is not going to emulate these
> devices then it is not going to allocate the BDF for them either.

Do we want the bdf allocation to be stable when switching between the
combined and disaggregated qemu-dms ?  If we do then it still needs to
be done by that qemu-dm using the same algorithm, presumably with
additional ipc.

If we don't then it would be ok for the bdfs to be allocated by new
code in the toolstack somewhere, eg libxl, but it still shouldn't be
up to the user to configure.

Ian.