Re: [Xen-devel] netif & grant tables

[Stefan Berger <stefanb@xxxxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 07/01/2005
03:40:31 PM:

> Hi Stefan,
> 
> I'm not trying to run the backend or any real drivers in domU,
> only the frontend.

Just curious: On IA64 you must have grant tables to
get networking working?

If someone has the matching problem for my solution,
then let me know. :-)
Otherwise I think the problem of making domains privileged
should really be solved - probably starting somewhere in XEN-D.

   Stefan

> 
> Matt
> 
> 
> On Fri, Jul 01, 2005 at 04:29:20PM -0400, Stefan Berger wrote:
> > xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 06/30/2005 10:28:54
PM:
> > 
> > > Hi,
> > > 
> > > I'm currently looking at getting domU networking working
> > > on IA64, and to do this I need to make netback/netfront
> > > use grant tables.
> > 
> > You *probably* won't get this to work right out of the box. On
i386 it 
> > fails due to dom Us not becoming privileged and so a check like
IS_PRIV() 
> > fails in xen/common/grant_table.c line 692 and probably somewhere
else 
> > also. The question is how this should be fixed. Should the HV
call to 
> > create a domain receive an additional parameter including flags
that 
> > should be set in a domain, such as for example the _DOMF_privileged?
> > Currently this flag only seems to be set in one place for dom
0.
> > 
> > The quick fix is:
> > add 
> >         set_bit(_DOMF_privileged, &d->domain_flags)
> > 
> > before the 'return d' in do_createdomain() in xen/common/domain.c
-> it 
> > will make all domains privileged 
> > 
> > To compile the backends into a domU I had to activate 
> > CONFIG_XEN_PRIVILGED_GUEST and CONFIG_XEN_PHYSDEV_ACCESS in the
.config 
> > file of the dom U kernel for having alloc_empty_lowmem_region()
compiled 
> > into th kernel (arch/xen/i386/mm/hypervisor.c). Is this call
to 
> > alloc_empty_lowmem_region() necessary or would another memory
allocation 
> > routine work as well. All the backends seem to use it, though.
> > 
> >    Stefan
> >  
> > > 
> > > I'm told that there's already a patch floating around,
> > > can someone tell me where to find it?
> > > 
> > > Matt
> > > 
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-devel
> > 
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> 
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