Xen devel - Mar 2006 - driver domains / PCI passthru on amd64

Hi,

are driver domains supported with xen on amd64? I read some weeks ago, that it
is marked x86 specific, even if it would work on amd64, too.

When I append pciback.hide=, it doesn''t have any effect.

Can somebody tell me, what''s going on?

Johnny

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Hi Johnny

I am running an x86_64 system here and pci passthrough does seem to
work for paravirtualized guests.  You won''t notice any effect in your
dom0 (ie: it will still show up in lspci).  However, if you check your
dmesg, you will notice a message like ''pciback: grabbing device
nn:nn.n''.  This means that the pci backend driver has claimed
ownership of your device, denying other drivers access, and ensuring
that it can be passed off to a domU when needed.

Hope that helps!
Dave

On 3/21/06, Hans-Christian Armingeon <johnny@wh-netz.de>
wrote:
> Hi,
>
> are driver domains supported with xen on amd64? I read some weeks ago, that
it is marked x86 specific, even if it would work on amd64, too.
>
> When I append pciback.hide=, it doesn''t have any effect.
>
> Can somebody tell me, what''s going on?
>
> Johnny
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

--
Dave Goodlad
dgoodlad@gmail.com or dave@goodlad.ca
http://david.goodlad.ca/

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Am Mittwoch, 22. März 2006 08:16 schrieb David Goodlad:
> Hi Johnny
> 
> I am running an x86_64 system here and pci passthrough does seem to
> work for paravirtualized guests.  You won''t notice any effect in
your
> dom0 (ie: it will still show up in lspci).  However, if you check your
I wondered, that lspci showed me the devices. I searched for a message lieke
"Hiding pci ... " dmesg or xm dmesg, and didn''t find such a
line.
> dmesg, you will notice a message like ''pciback: grabbing device
> nn:nn.n''.  This means that the pci backend driver has claimed
> ownership of your device, denying other drivers access, and ensuring
> that it can be passed off to a domU when needed.
> 
> Hope that helps!
Thank you.

What PCI Backend Mode should I use?
Virtual PCI or Passthrough?

Does it make an effect other than resorting the devices?

Johnny
> Dave
> 
> On 3/21/06, Hans-Christian Armingeon <johnny@wh-netz.de> wrote:
> > Hi,
> >
> > are driver domains supported with xen on amd64? I read some weeks ago,
that it is marked x86 specific, even if it would work on amd64, too.
> >
> > When I append pciback.hide=, it doesn''t have any effect.
> >
> > Can somebody tell me, what''s going on?
> >
> > Johnny
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@lists.xensource.com
> > http://lists.xensource.com/xen-users
> >
> 
> 
> --
> Dave Goodlad
> dgoodlad@gmail.com or dave@goodlad.ca
> http://david.goodlad.ca/
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 
-- 
jabber:johnny@wh-netz.de
icq:236971856

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On 3/22/06, Hans-Christian Armingeon <johnny@wh-netz.de>
wrote:
>
> What PCI Backend Mode should I use?
> Virtual PCI or Passthrough?
>
> Does it make an effect other than resorting the devices?
AFAIK, either one should work.  However, I am not an expert, so don''t
take my word for it :)

I do know that Passthrough mode was what I had selected when it was
working for me here, so at the very least that one works.

Dave

--
Dave Goodlad
dgoodlad@gmail.com or dave@goodlad.ca
http://david.goodlad.ca/

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On Wed, 2006-03-22 at 09:03 +0100, Hans-Christian Armingeon
wrote:
> What PCI Backend Mode should I use?
> Virtual PCI or Passthrough?
> 
> Does it make an effect other than resorting the devices?
> 
The only effect is the slot numbering of the devices in your domU
("resorting the devices" as you call it). Virtual PCI renumbers
everything to bus 0 while passthrough mode leaves them at their real
slot numbers. Passthrough *may* be required for certain device drivers
which look for devices at certain slot locations (but I''ve not seen
this
in practice).

Ryan


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