Re: [PATCH 0/6] add sysenter/syscall emulation for 32bit compat mode

[Avi Kivity <avi@redhat.com>]

On 06/17/2009 04:50 PM, Andre Przywara wrote:
> sysenter/sysexit are not supported on AMD's 32bit compat mode, whereas
> syscall is not supported on Intel's 32bit compat mode. To allow cross
> vendor migration we emulate the missing instructions by setting up the
> processor state accordingly.
> The sysenter code was originally sketched by Amit Shah, it was completed,
> debugged,  syscall added and made-to-work by Christoph Egger and polished
> up by Andre Przywara.
> Please note that sysret does not need to be emulated, because it will be
> exectued in 64bit mode and returning to 32bit compat mode works on Intel.
>
> This has been tested with GETPIDs in a tight loop in compat mode on both
> Intel and AMD boxes. Additionally a 32-bit userland was booted under a
> 64-bit kernel and then cross-vendor migrated.
>
> Please apply or comment ;-)
>    

Looks good except for the limit thing I pointed out.  If the correct 
thing is to change it to 0xffffffff, let me know and I'll do it in 
place, instead of resending the whole thing.

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