[SeaBIOS] MINIX 3.1.6 works in QEMU-0.12.3 only with KVM disabled

[Avi Kivity]

On 03/16/2010 01:31 PM, Antoine Leca wrote:
>
>>>>> (qemu) info registers
>>>>> SS =9492 00094920 0000ffff 0000f300
>>>>> DS =97ce 00097cec 0000ffff 0000f300
>>>>>            
>>>> A ds.base of 0x97cec cannot be translated to a real mode segment.
>>>>          
>> However, it's not clear why it would make a difference.
>>      
> Because when you return to real mode, if you do not clean up DS (and ES)
> beforehand, you end up with the previous (cached) bases and limits, the
> ones used for the move; the problem occurs with KVM (hardware
> virtualization) on Intel VT, because on that platform real mode is not
> really possible, so it is faked... and they have no good way to fake a
> mis-aligned segment (not present segment is not available in V8086, for
> example.)
>    

Correct.  To be clear, I regard this as a kvm bug, however fixing it 
will take a while, so I would appreciate a workaround in seabios.

-- 
error compiling committee.c: too many arguments to function