Re: [Xen-devel] Can guest OS handle system calls by itself?

["Yan Li" <yan_li00@xxxxxxxxxxx>]

Thank you! Then which part of the codes should I look at about this issue? I
wanna have a more clear vision of it.

Thanks,
Yan
----- Original Message ----- 
From: "Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>
To: "Yan Li" <yan_li00@xxxxxxxxxxx>
Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxxx>; <Ian.Pratt@xxxxxxxxxxxx>
Sent: Tuesday, June 01, 2004 1:20 AM
Subject: Re: [Xen-devel] Can guest OS handle system calls by itself?


> >
> > I'm wondering if the guest OS can handle most of the system calls by
itself?
> > Only for these hypercalls defined in hypervisor.h, guest OS needs to go
down
> > to Xen. For all other system calls, xeno handles in its own doamin well.
>
> A Guest OS can register a 'fast trap' handler that will typically
> enable direct entry to its system call handlers without bouncing
> via Xen.  The guest will probably be able to handle most system
> calls without any interaction with Xen. However, if it's modifying
> or switching page tables etc then it will need to make hypercalls
> down to Xen in the normal way.
>
> Ian
>
>
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