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

[Karl Magdsick]

> VMware handles kernel code. You are right that x86 code can't be 100% 
> virtualized
> (even at the userland level) but VMware uses a lot of nasty disgusting tricks
> in order to work around them. (For example, playing with shadow pagetables
> so that a page of modified code is run but if the code tries to inspect itself
> it sees another (unexecuted) page that contains the original code.)

I take it self-modifying kernel code would have serious issues.

I seem to recall my attempts to run v2OS (which uses a self-modifying
assembly code boot sequence) inside VMWare crashing badly circa 2001.


-Karl