Re: [Qemu-devel] About qemu emulation speed (a question) and supported OS

[Anthony Liguori]

Jim C. Brown wrote:

> On Tue, Sep 13, 2005 at 11:27:39PM -0500, Anthony Liguori wrote:
>  
>
> > I reckon kqemu has this same problem... Technically, even in ring 3, if 
> > you run natively, you violate the Popek/Goldberg requirements because of 
> > cpuid.  It's just not possible to trap it but it shouldn't matter for 
> > most software.
> >
> >    
>
> It is possible to trap it, in a sense. You just read ahead and replace the
> cpuid instruction with something else.
>  
You can't readahead beyond a basic block.  Taking a trap for each basic 
block and translating the block is what QEMU does.

Regards,

Anthony Liguori

> Ugly, but doable.
>
>