CentOS virt - Jun 2014 - Are xen and centos incompatible?

Hi,

I'm trying to pass a physical network interface through to a domU.

This seems to be impossible because the way xen wants to do it is
incompatible with the way centos wants to do it.

I followed documentation on http://www.xen-support.com/?p=151 and tried
booting with 'pciback.permissive pciback.hide=(06:00.0)'.  This gives a
hint in dmesg "kernel: xen-pciback: backend is vpci", and the device
is
still visible in dom0.  So this obviously doesn't work.

Following http://wiki.xen.org/wiki/Xen_PCI_Passthrough:


[root at heimdall ~]# xl pci-assignable-add 06:00.0
xend is running, which may cause unpredictable results when using
this xl command.  Please shut down xend before continuing.

(This check can be overridden with the -f option.)
[root at heimdall ~]# 


There doesn't seem to be any documentation about what xend does or is
for and how to pass a physical network interface through with it.

I'm starting to think that using centos for a server os is an extremely
bad choice because nothing works.  It's not like a Linux distribution
but like a mess of pieces from several unrelated puzzles thrown together
randomly.


-- 
Knowledge is volatile and fluid.  Software is power.

On Sat, Jun 07, 2014 at 02:44:54AM +0200, lee wrote:
> Hi,
> 
> I'm trying to pass a physical network interface through to a domU.
> 
> This seems to be impossible because the way xen wants to do it is
> incompatible with the way centos wants to do it.
Huh?
> 
> I followed documentation on http://www.xen-support.com/?p=151 and tried
> booting with 'pciback.permissive pciback.hide=(06:00.0)'.  This
gives a
> hint in dmesg "kernel: xen-pciback: backend is vpci", and the
device is
> still visible in dom0.  So this obviously doesn't work.
The device should be visible in the dom0 - even when it is for passthrough.

But irrespective of that - the steps mentioned there are out of date.
The correct option should be 'xen-pciback.hide=(06:00.0)
xen-pciback.permissive=1'
> 
> Following http://wiki.xen.org/wiki/Xen_PCI_Passthrough:

which is mentioned in that link.
> 
> 
> [root at heimdall ~]# xl pci-assignable-add 06:00.0
> xend is running, which may cause unpredictable results when using
> this xl command.  Please shut down xend before continuing.
> 
> (This check can be overridden with the -f option.)
> [root at heimdall ~]# 
> 
> 
> There doesn't seem to be any documentation about what xend does or is
> for and how to pass a physical network interface through with it.
Did you just try using the same parameter but replace 'xl' with
'xm'?
> 
> I'm starting to think that using centos for a server os is an extremely
> bad choice because nothing works.  It's not like a Linux distribution
> but like a mess of pieces from several unrelated puzzles thrown together
> randomly.
> 
> 
> -- 
> Knowledge is volatile and fluid.  Software is power.
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