Re: [Xen-devel] [PATCH] paging_enabled and non-HVM guests

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Hollis Blanchard wrote:
> On Tue, 2006-05-09 at 13:31 +0200, Simon Kagstrom wrote:
>   
> > I had a problem with the GDB-server crashing on connections in
> > xen_ptrace.c:map_domain_va(). paging_enabled() should only be checked
> > for HVM guests, and the patch adds a check for that.
> >
> > Signed-off-by: Simon Kagstrom <ska@xxxxxx>
> >
> > diff -r 4501d60d6add tools/libxc/xc_ptrace.c
> > --- a/tools/libxc/xc_ptrace.c   Tue May  9 09:57:05 2006
> > +++ b/tools/libxc/xc_ptrace.c   Tue May  9 13:26:14 2006
> > @@ -374,7 +374,7 @@
> >      if (fetch_regs(xc_handle, cpu, NULL))
> >          return NULL;
> >  
> > -    if (!paging_enabled(&ctxt[cpu])) { 
> > +    if ( (ctxt[cpu].flags & VGCF_HVM_GUEST) && !paging_enabled(&ctxt[cpu])) { 
> >          static void * v;
> >          unsigned long page;
> >     
> I looked at this a couple weeks ago, and I think the real problem is
> that the CR registers are never updated in Xen's vcpu structure, and so
> xc_vcpu_getcontext() doesn't get them either. So Xen should be fixed; we
> shouldn't add workarounds to userland.
>   
I think that the CR registers are never changed during the life of a PV 
domain.  I think all that's needed is for some sane values to be set 
during domain creation and things start working.  I believe Ryan had a 
patch that did this?
Regards,

Anthony Liguori



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