Re: [RFC PATCH 0/3] Add segment limit checks to emulator

[Avi Kivity <avi@redhat.com>]

On 07/08/2010 12:23 AM, Mohammed Gamal wrote:
> After some conversation with Avi concerning why unreal mode has been seen to work
> with KVM on Intel. It clears out the scenario is caused as follows:
>
> - guest enters big real mode
> - kvm squashes limit to 64k-1
> - guest executes instructions with offset>  64k
> - cpu issues #GP due to limit violation
> - kvm handle_rmode_exception() ->  emulator
> - emulator ignores limit, emulates instruction
>
> With these applied I am getting vmentry failures with SeaBIOS and
> gPXE. So it's needless to say that these patches are not meant for merging!
>    

btw, we'll want unit tests for those.  Access just below the limit, 
access that's partially within and partially outside the limit, with 
base=0 and base!=0, in 16, 32 and 64 bit modes.

IIRC the emulator only builds in 64 bits.  I'll see what it takes to 
make it build and run on 32 bits.

-- 
error compiling committee.c: too many arguments to function