Re: kvm guest for 486 sx

[Jerry Geis <geisj@pagestation.com>]

Avi Kivity wrote:
> On 07/07/2009 04:15 PM, Jerry Geis wrote:
>>>> Notice FPU indicates yes and I requested -fpu on the command line.
>>>
>>> I think it detects the host fpu as a 487 coprocessor.  Anything in 
>>> dmesg about it?  Note there's no fpu in the flags: line.
>>>
>>> That's a kvm kernel bug.
>>>
>>>> also is this a 486 as it says AMD?
>>>
>>> You can override it if you like, -cpu 486,vendor=AuthenticAMD (I 
>>> think).
>>>
>>
>> Sorry - I thought the " -cpu 486,-fpu " was the way to turn off the fpu.
>> I 'm trying to emulute a 486 sx that has no fpu.
>
> I thought so too, but in fact it emulates a 486sx+487.  We can make it 
> emulate a 486sx without a 487, but that will take a kernel patch.
>
I'd be interested in that if you can make it happen.

jerry