Re: [Xen-users] Problem with delegated hardware (Realtek Network driver 8139too)

[Luciano Coutinho Barcellos <luciano@xxxxxxxxxxxxxxxxx>]

Edson Marquezani Filho wrote:
> On Sat, Feb 27, 2010 at 17:49, Luciano Coutinho Barcellos
> <luciano@xxxxxxxxxxxxxxxxx> wrote:
>   
> > Dear friends,
> >
> >  I've googled a lot before giving up and come here to ask for some help. All
> > I've found about my problem was a pretty old single message with no reply
> > since it was post on Jul 19th, 2007.
> >  I hope to have better luck and find some light to solve the problem. I want
> > to configure a domU, with 3 nics (identified as having the Realtek 8139D
> > chip) delegated to it. Everything works almost great except for the message
> > shown when I try to ifconfig any card:
> >
> >       SIOCSIFFLAGS: Cannot allocate memory.
> >
> >  Considering the following:
> >
> >      - The cards work fine on dom0;
> >      - Delegating a card with chipset Via works on domU;
> >      - Everything is fine with passthrough, card detection and module
> > loading in domU.
> >
> >   What could be the problem?
> >   I've read something about an old b44 driver which suffered from a
> > limitation about memory allocation. It needed memory from the first physical
> > 16MB. Could it be a similar problem?
> >   My configuration is the folowing:
> >
> >      - dom0 kernel command line includes:
> >  pciback.hide=(00:08.0)(00:09.0)(00:0a.0)
> >      - domU configuration file has: pci = [ '00:08.0', '00:09.0', '00:0a.0'
> > ]
> >      - xen hypervisor: 3.2.1-i386 from Debian Lenny repositories
> >      - linux kernel for both dom0 and domU: 2.6.26-2-xen-686 from Debian
> > Lenny repositories
> >      - kernel module used for the nics: 8139too
> >
> >   Hope to get some help.
> >
> >     
> I see you are using Debian. Are you aware of what Debian Wiki says
> about pci passthrough on Lenny [1]? In few words, it says that it's
> possible only if you run kernel 2.6.18 (Etch's one) for both dom0 and
> domU.
> Actualy, I didn't tested it but I assumed it as being true and didn't
> even try to configure pci passthroug with kernel 2.6.26.
>
> Anyway, you say it has worked for you and I do believe. =) But, there
> may be some issue related to the kernel you are using. I would try
> some more "traditional" Xen kernel. =)
>
> Just a clue. I hope this can help you a little bit. =)
>
> [1] http://wiki.debian.org/Xen#Installationonlenny
>   
   Thank you very much, Edson. I've just tried with the 2.6.18 kernel 
from Etch and it just worked. I've manually downloaded and installed the 
linux-image 
(http://packages.debian.org/etch/linux-image-2.6.18-6-xen-686) and 
linux-modules 
(http://packages.debian.org/etch/i386/linux-modules-2.6.18-6-xen-686/download) 
from Etch.
   Now the dom0 shows a lot of 4gb seg fixup messages in console, but 
that's another question, and I think I can fix it as I've seen about 
that before.
   Thanks again. Valeu! :)
   Luciano.

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