[Qemu-devel] Re: [PATCH 0/3]: Add UUID command-line option

[Gleb Natapov <gleb@qumranet.com>]

On Mon, Jul 28, 2008 at 11:17:33AM -0500, Anthony Liguori wrote:
> Gleb Natapov wrote:
>>
>> CMOS has enough memory for UUID, but UUID is not the only thing that
>> needs to be passed to BIOS, so eventually we can run out of space there.
>>   
>
> I'm inclined to think that on a real machine, the UUID is stored in the  
> CMOS.
>
Should be easy to check.

>> For example we have a requirement to pass additional ACPI tables that
>> user may specify on command line.
>
> What's the use-case?  I don't think this is a very good idea.
>
AFAIK some OEM version of windows needs special ACPI table for
activation.

>>  There is no enough space to put those
>> tables into CMOS. What I did is that: BIOS passes to qemu address where to
>> store additional tables (via backdoor) and qemu copies them there. To
>> this scheme to work there should be bidirectional channel between qemu
>> and BIOS. Other then that I am not particularly attached to vmware
>> backdoor :)
>>   
>
> You can not arbitrarily extend the backdoor interface.  It's an  
> interface defined and controlled by VMware.  If you extend it, you risk  
> breaking other OSes that are assuming that interface has a different  
> meaning.
>
I am not disagreeing with you. Lets define another interface that is
acceptable by everyone here and I (or somebody else) will implement it. 

--
			Gleb.