Re: [Qemu-devel] [PATCH 0/2] port over extboot from kvm

[Anthony Liguori]

Hannes Reinecke wrote:
> But why? Why do we have to emulate the entire HBA for the BIOS?
> The HBA is emulated, too, and just uses the bdrv interface
> internally anyway.
> So IMHO it makes far more sense to skip the HBA emulation in
> the BIOS completely and just use the bdrv interface directly
> here.
>   

If you use the bdrv interface (ala extboot), you couldn't boot via scsi 
passthrough.

VirtualBox implements a paravirtual SCSI bus to allow SCSI boot without 
having to implement a full LSI driver.  That's another way to solve the 
problem.

Regards,

Anthony Liguori