Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios

[Gleb Natapov <gleb@redhat.com>]

On Mon, Oct 11, 2010 at 03:30:21PM -0500, Anthony Liguori wrote:
> On 10/11/2010 02:59 PM, Gleb Natapov wrote:
> >No boot rom should do that. extboot wreaks havoc when it is used.
> >And since virtio is now supported by bios there is no reason to use it.
> 
> You don't really have a choice.  You could be doing hardware
> passthrough and the ROM on the card may hijack int19.
> 
Then this particular HW would be broken on real HW too and will not
respect BIOS settings. But the code we provide should work properly.

> >Whoever needs scsi boot should add it to seabios too.
> 
> I don't disagree.
> 
> I think the best thing to do is to let SeaBIOS create a boot order
> table that contains descriptive information and then advertise that
> to QEMU.
> 
What for? Why this step is needed?

> QEMU can then try to associate the list of bootable devices with
> it's own set of devices and select a preferred order that it can
> then give back to SeaBIOS.  SeaBIOS can then present that list to
> the user for additional refinement.
> 
Why not skip your first step and let QEMU create boot order list and
pass it into Seabios. If menu=on option is present user will be able to
override the default from Seabios.

--
			Gleb.