[Xen-devel] [PATCH 0/3] Enable Option ROM support in Guest BIOS

["Shan, Haitao" <haitao.shan@xxxxxxxxx>]

Hi, Keir,

These three patches enables Option ROM support in guest BIOS. Please see 
detailed description below.

Descriptions:
etherboot_reloc.patch: Relocating the etherboot ROM to be near the end of VGA 
BIOS. Current Xen hard coded VGA ROM at 0xC0000 and etherboot ROM at 0xD0000. 
This makes the space in [0xC0000 - 0xDFFFF] to be fragments, which makes it 
hard to find enough space to hold another Option ROM.

rom_copy.patch: In hvmloader, scan the PCI hierarchy and load Option ROM at 
proper place. If no space is left, a warning is given out.

rom_exec.patch: Append the BDF of the device at the end of the Option ROM 
location. Guest BIOS will fetch this info and pass it to Option ROM 
initialization routine.

I have tested the patch using a PCI SCSI card. I can successfully run the 
Option ROM to configure the SCSI disk.

Note: There is no support for booting from SCSI disk now. Since guest BIOS 
lacks support for that. Please see the comments below.
//--------------------------------------------------------------------------
// BIOS Boot Specification 1.0.1 compatibility
//
// Very basic support for the BIOS Boot Specification, which allows expansion
// ROMs to register themselves as boot devices, instead of just stealing the
// INT 19h boot vector.
//
// This is a hack: to do it properly requires a proper PnP BIOS and we aren't
// one; we just lie to the option ROMs to make them behave correctly.
// We also don't support letting option ROMs register as bootable disk
// drives (BCVs), only as bootable devices (BEVs).
//
// 
http://www.phoenix.com/en/Customer+Services/White+Papers-Specs/pc+industry+specifications.htm
//--------------------------------------------------------------------------

Best Regards
Haitao Shan

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