[SeaBIOS] [PATCH 0/9] q35 seabios support take #1

[Paolo Bonzini]

Il 13/09/2012 22:12, Jason Baron ha scritto:
> Subject: [PATCH 0/9] q35 seabios support take #1
> 
> Hi,
> 
> Seabios bits for q35 support, I'm posting the qemu changes separately. The
> patches require '-M pc_q35' and -L 'seabios dir with q35 changes' on the
> qemu command line. Hopefully, we can make it the default for x86 at some future
> point when we feel comfortable with it.

The main question, IMHO, is how to proceed for supporting both PIIX4 and
q35.  The two extreme possibilities are:

- use a single binary for everything

- use two binaries for everything

Right now, you do a mix of the two, where you have two DSDTs and one
binary.  Furthermore, PIIX4 is still a "preferred" chipset in that its
DSDT is embedded in SeaBIOS and q35's isn't.

With more than one chipset being supported, and with the desire to
support OVMF/UEFI as an alternative firmware, I think it makes sense to
move QEMU towards a model more similar to CoreBoot's, where QEMU itself
makes the default ACPI tables and passes them to SeaBIOS or OVMF via fw_cfg.

So my favorite choice is to move the DSDT to fw_cfg, and keep a single
binary for everything else.  I don't really care whether the DSDT
sources live in the SeaBIOS or QEMU repository, though the former makes
more sense until all things ACPI are done in QEMU.

Paolo