Re: [Qemu-devel] [PATCH - V3] Port codes from qemu-kvm to support booting from SCSI disk image

[Haishan Bai <haishan.bai@gmail.com>]

On 08/18/2010 11:16 PM, Alexander Graf wrote:
> On 18.08.2010, at 17:08, Paul Brook wrote:
>
>    
>>> The qemu-kvm could boot from SCSI disk image by utilizing seabios, this
>>> patch ported codes
>>> from qemu-kvm to let upstream qemu to support booting from SCSI disk image.
>>>        
>> No. This has nothing to do with SCSI.
>>
>> What it does is add a really cheap and nasty block storage device that aliases
>> one of the other block devices in the system. This is bad. The OS has no way
>> of knowing which devices are aliased, and we really don't want yet another
>> braindead guest visible interface (c.f. recent performance issues where -
>> kernel/fw_cfg were being abused)
>>
>> This has been discussed several times before. The proper solution is to teach
>> the bios how to boot off SCSI devices. IIRC support for virtio devices already
>> exists, implementing support for the SCSI controller shouldn't be that much
>> harder.
>>      
> Couldn't we just have an option rom for the SCSI controller? The same way the VGABIOS is a rewrite of a VGA BIOS for the Cirrus Logic...
>
>    

In my opinion add SCSI support to seabios would be a choice.


> Alex
>
>