Re: Booting/installing WindowsNT

[Michael Tokarev <mjt@tls.msk.ru>]

05.05.2010 12:32, Andre Przywara wrote:
> Avi Kivity wrote:
>> On 05/04/2010 06:27 PM, Andre Przywara wrote:
>>>
>>>> 3. In all other cases so far it BSoDs with STOP 0x3E error
>>>> right before displaying that kernel message.
>>> MSDN talks about a mulitprocessor configuration error:
>>> http://msdn.microsoft.com/en-us/library/ms819006.aspx
>>> I suspected the offline CPUs in the mptable that confuse NT. But -smp
>>> 1,maxcpus=1 does not make a difference. I will try to dig deeper in
>>> this area.
> OK, I tackled this down. It is the max CPUID level that differs.
> In the AMD CPUID guide leafs 0000_0002 till 0000_0004 are reserved, the
> CPU that Michael and I used (K8RevF) actually have a max leaf of 1 here.
> Default qemu64 has a max leaf of 4.
> So by saying -cpu qemu64,level=1 (or 2 or 3) it works for me.
> Modern OS only read leaf 4 on Intel systems, it seems that NT4 is
> missing this.

Confirmed, with -cpu qemu64,level=[123] it works for me as well.

Note again that after service pack 6 (I haven't tried other SPs),
the problem goes away entirely -- winNT SP6 works with the default
kvm cpu just fine.

Thanks!

/mjt