Re: [BUG] x86 kenel won't boot under Virtual PC

[H. Peter Anvin]

Ingo Molnar wrote:
> > I thought you agreed that CPU virtualization can be a problem? That 
> > was the whole excuse for why the dynamic code was changed. Why would 
> > it not be true for the static code?
> >
> > The fact is, if you want to run on a Core2 or other modern CPU, then 
> > "Virtual PC" is apparently buggy in this respect. You worked around it 
> > for the dynamic choice - but that's totally _pointless_ if you then 
> > don't want to work around it for the static one.
>
> yes. X86_P6_NOPS is a totally insignificant optimization and if it makes 
> _any_ CPU not boot (be that virtual or real), then it's frankly not 
> worth it.
>
> David, exactly how does the kernel fail to boot with latest -git? 
> (v2.6.27-rc5-313-g64f996f or later) Does detect_nopl() run? It really 
> should, and it should detect the non-working instructions.

It almost certainly never gets as far as detect_nopl().

	-hpa
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