Re: [Xen-devel] netif & grant tables

[Matt Chapman <matthewc@xxxxxx>]

Hi Stefan,

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

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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel