Re: [Xen-devel] Crashing Xen

[Jacob Gorm Hansen <jacob@xxxxxxxx>]

On Wed, 2004-01-07 at 16:52, Keir Fraser wrote:
> > Does Xen use the start_info (passed in ctxt->esi) for anything (such as
> > setting up CR3), or is this value just passed on to the domain? Is
> > passing bogus start_info a problem for Xen?
> 
> No, the start_info structure is opaque to Xen. The definition of
> start_info, and the convention of passing a pointer to it in %esi, is
> known only to DOM0 control utils and guest OSes.
>  
> > If not, what is the state of CR3 and paging when the domain boots?
> 
> It's a field in full_execution_context_t, passed to
> DOM0_BUILDDOMAIN.

This is what went wrong, specifying a sane pt_base value improved
things. I suppose that in a perfect world Xen could check the ownership
and pinning of this page and report and error on domain creation.

thanks,
Jacob



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