Xen users - Mar 2010 - [solved] Error: pci: 0000:01:07.0: non-page-aligned MMIO BAR found.

Hi Folks,

I make I new approach to pimp up my xen-Kernel in higher version-numbers.
Currently I run a selfcompiled 2.6.27-Kernel from:
hg clone http://xenbits.xensource.com/ext/linux-2.6.27-xen.hg

In the next step I want to run the kernel from jemery:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git

I tried the last couple of days to get pci-passtrough work with jeremys kernel
but I still get:
----
chieftec:~# xm create vdr1.cfg
Using config file "/etc/xen/vdr1.cfg".
Error: pci: 0000:01:07.0: non-page-aligned MMIO BAR found.
----

For quite a long I zero in on the following lines in "xm dmesg":
-------
(XEN) AMD SVM: ASIDs enabled.
(XEN) HVM: SVM enabled
(XEN) HVM: Hardware Assisted Paging detected.
[..]
(XEN) AMD-Vi: IOMMU not found! <------ (kernel option iommu=1)
(XEN) I/O virtualisation disabled <----- 
-------
After a while I found out that this errors also could be find in the working
2.6.27-kernel. So I guess that could not be what caused this mess. :)

While I write this mail I found the solution… *DANCING*
So for all who are struggling with this akward error:
-> xen-pciback.hide=(X:XX.X) pci=resource_alignment=XX:XX.X <-
works for me!
----
title           Xen 3.4.2 / 2.6.31.12-xen4
root            (hd0,6)
kernel          /boot/xen-3.4.2.gz 
module          /boot/vmlinuz-2.6.31.12-xen4 root=/dev/sda7 ro console=tty0
pci=nomsi noreboot xen-pciback.hide=(01:07.0) pci=resource_alignment=01:07.0
module          /boot/initrd.img-2.6.31.12-xen4
----

Now I get:
-----
chieftec:~# xm create vdr1.cfg
Using config file "/etc/xen/vdr1.cfg".
Started domain vdr1 (id=1)
chieftec:~# 
-----

Have a great weekend
Christian
-- 
GMX DSL: Internet, Telefon und Entertainment für nur 19,99 EUR/mtl.!
http://portal.gmx.net/de/go/dsl02

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On Sat, Mar 13, 2010 at 12:29:43PM +0100, Christian Kniep
wrote:
> Hi Folks,
> 
> I make I new approach to pimp up my xen-Kernel in higher version-numbers.
> Currently I run a selfcompiled 2.6.27-Kernel from:
> hg clone http://xenbits.xensource.com/ext/linux-2.6.27-xen.hg
> 
Just a note to everyone, the ext/linux-2.6.27-xen.hg tree shouldn''t be
used!!
It''s known to be buggy and unmaintained!!

See: http://wiki.xensource.com/xenwiki/XenDom0Kernels

> In the next step I want to run the kernel from jemery:
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git
> 
> I tried the last couple of days to get pci-passtrough work with jeremys
kernel but I still get:
> ----
> chieftec:~# xm create vdr1.cfg
> Using config file "/etc/xen/vdr1.cfg".
> Error: pci: 0000:01:07.0: non-page-aligned MMIO BAR found.
> ----
> 
Hmm.. I haven''t seen that earlier. What kind of device are you trying
to passthrough?

> For quite a long I zero in on the following lines in "xm dmesg":
> -------
> (XEN) AMD SVM: ASIDs enabled.
> (XEN) HVM: SVM enabled
> (XEN) HVM: Hardware Assisted Paging detected.
> [..]
> (XEN) AMD-Vi: IOMMU not found! <------ (kernel option iommu=1)
> (XEN) I/O virtualisation disabled <----- 
>
Does your hardware actually have an IOMMU that can be used for HVM guest PCI
passthrough?

> -------
> After a while I found out that this errors also could be find in the
working 2.6.27-kernel. So I guess that could not be what caused this mess. :)
> 
> While I write this mail I found the solution??? *DANCING*
> So for all who are struggling with this akward error:
> -> xen-pciback.hide=(X:XX.X) pci=resource_alignment=XX:XX.X <-
> works for me!
Good to hear!
> ----
> title           Xen 3.4.2 / 2.6.31.12-xen4
> root            (hd0,6)
> kernel          /boot/xen-3.4.2.gz 
> module          /boot/vmlinuz-2.6.31.12-xen4 root=/dev/sda7 ro console=tty0
pci=nomsi noreboot xen-pciback.hide=(01:07.0) pci=resource_alignment=01:07.0
> module          /boot/initrd.img-2.6.31.12-xen4
> ----
> 
> Now I get:
> -----
> chieftec:~# xm create vdr1.cfg
> Using config file "/etc/xen/vdr1.cfg".
> Started domain vdr1 (id=1)
> chieftec:~# 
> -----
> 
I assume ''vdr1'' guest is PV. 
PV guests don''t require IOMMU for PCI passthrough. 

Xen HVM guests require hardware IOMMU for PCI passthru.

-- Pasi


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