Re: [Xen-devel] Re: [PATCH] Xen Guest Kexec

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 2 Mar 2006, at 09:16, Gerd Hoffmann wrote:

> Thanks, it at least doesn't crash any more.  It doesn't work yet 
> either,
> but that most likely is a bug in setting up my page tables ...
>
> btw: What happens if I try to install a gdt with zero entries?  Can I 
> do
> that?  Are there some default code/data/stack segments (full 4G minus
> xen hole) available I can use then?  IIRC the domain builders don't
> setup a gdt, so there must be some which are used at boot time until 
> the
>  OS kernel installes its own ...
The default segment descriptors are *always* available. A guest can 
only install up to a 14-page GDT: the 15th and 16th pages are reserved 
by Xen and always present.
 -- Keir


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