Re: [Xen-devel] how page faults are handled in paravirtualized xenguests?

[Daniel Stodden <stodden@xxxxxxxxxx>]

On Tue, 2008-03-11 at 09:38 +0800, tgh wrote:
> hi
>   and that is ,in 64-bit,guest application entry into guestos kernel 
> directly through SYSCALL,or  not?

no, you can't. programs use syscall to enter the kernel, and the kernel
is using syscall to enter xen. since you can only configure one entry
point at a time (and both xen and applications run in ring 3 anyway),
xen is handling all syscalls, then checks the context it was issued
from, and forwards the call to to the guest kernel if it was user code.

regards,
daniel

-- 
Daniel Stodden
LRR     -      Lehrstuhl fÃr Rechnertechnik und Rechnerorganisation
Institut fÃr Informatik der TU MÃnchen             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
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