Re: [Qemu-devel] [PATCH V2] pci: fixes to allow booting from extra root pci buses.

[Kevin O'Connor <kevin@koconnor.net>]

On Sun, Jun 14, 2015 at 08:06:22PM +0200, Michael S. Tsirkin wrote:
> To summarise, you feel that modifying bus id without reordering
> bus ids between roots is likely, modifications that would
> cause reordering are unlikely, thus counting bus ids
> in order gives a stable index. Is that right?

Yes.

> To be on the safe side, it would be nice to have bios skip some
> fields/properties when parsing paths, so that if we want to use another
> id in the future, we can supply both id types.  I haven't looked at the
> parsing code - maybe it does this already?

SeaBIOS already does that.  (SeaBIOS doesn't parse the bootorder file
- it generates a "glob" like pattern for each device and then sees if
that pattern matches a line in the bootorder file.)

Also, I don't have a strong objection to Laszlo's SeaBIOS patch (the
one that does the runningOnQEMU() check).  (I still think it's quirky
to use bus-id in the file, but it's not a show stopper if it's just
for QEMU.)

-Kevin