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Re: [Xen-devel] IOMMU and AMD 890fx

To: "Huang2, Wei" <Wei.Huang2@xxxxxxx>
Subject: Re: [Xen-devel] IOMMU and AMD 890fx
From: Jens Krehbiel-Gräther <xen@xxxxxxxxxxxxxxxxxx>
Date: Sat, 19 Jun 2010 09:46:20 +0200
Cc: "Przywara, Andre" <Andre.Przywara@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Eikelenboom <linux@xxxxxxxxxxxxxx>, Leonardo Prosperi <leo.prosperi@xxxxxxxxx>, Boonen <joop_boonen@xxxxxx>, Oakley <andrew@xxxxxxxxxxxxxxxxx>
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Yes xen-4.0.0 I got from http://www.xen.org/products/xen_source.html (donwload link is http://bits.xensource.com/oss-xen/release/4.0.0/xen-4.0.0.tar.gz).


Am 18.06.2010 19:36, schrieb Huang2, Wei:
Great. Where did you get xen-4.0 from? www.xen.org/products/xen_source.html? We 
can certainly take a look. It might not have all IOMMU patches as in 
xen-4.0-testing. Wei Wang is out for vacation. So it might take a while...


-----Original Message-----
From: Jens Krehbiel-Gräther [mailto:xen@xxxxxxxxxxxxxxxxxx]
Sent: Thursday, June 17, 2010 6:36 PM
To: Huang2, Wei
Cc: Konrad Rzeszutek Wilk; Przywara, Andre; xen-devel@xxxxxxxxxxxxxxxxxxx; 
Leonardo Prosperi; Joerg Roedel; Eikelenboom; Joop Boonen; Oakley
Subject: Re: [Xen-devel] IOMMU and AMD 890fx


Thanks for the tips!

With xen-4.0-testing.hg tree + 2.6.32-bpo.5-xen-amd64 (from debian lenny
backports) it works. So the 4.0.0 release could be buggy?
When I compile and install xen-4.0-testing.hg tree it works as you
With 4.0.0 it did not work with any pci device, with xen-4.0-testing.hg
tree it works with the two I tested for the moment:

00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA) (rev 40)
03:00.0 Ethernet controller: Marvell Technology Group Ltd. Device 4381
(rev 11)

(I just randomly take two devices).
They appear in the hvm virtual machine and they are working.

Great, thank you very much!


Am 17.06.2010 19:16, schrieb Wei Huang:
Hi Jens,

Thanks for testing it out. I tested Xen 4.0 on my machine this morning.
The passthru did work. Here are the details:

1. I used Xen 4.0 (xen-4.0-testing.hg tree) + Dom0
2. My system is a workstation; so it doesn't have a HDA device. Here is
what I get from lspci (I skipped some of un-related devices):
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3b)
00:14.1 IDE interface: ATI Technologies Inc SB700/SB800 IDE Controller
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:14.5 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI2
01:00.0 VGA compatible controller: ATI Technologies Inc Device 949e
01:00.1 Audio device: ATI Technologies Inc RV730XT Audio device [Radeon
HD 4670]
02:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet
Controller (rev 06)
02:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet
Controller (rev 06)
03:00.0 Ethernet controller: Intel Corporation 82572EI Gigabit Ethernet
Controller (Copper) (rev 06)
As you can see, I have two NICs (a two-port Intel 82571EB NIC and a
single-port 82572EI NIC). I am going to passthru 82571EB NIC to a Linux
guest VM.

3. Here is the output from "xm dmesg". Because you also see a similar
message, I think your IOMMU is working.
(XEN) AMD-Vi: IOMMU 0 Enabled.
(XEN) I/O virtualisation enabled
(XEN) I/O virtualisation for PV guests disabled

FYI, here is my grub entry:
title 64bit Xen-unstable on SLES11
root (hd0,5)
kernel /boot/xen.gz dom0_mem=512M console=com2 com2=115200,8n1 iommu=1
module /boot/vmlinuz- root=/dev/hdb6 resume=/dev/hdb3
module /boot/initrd-

4. After login, I removed 82571EB from dom0

  >  echo -n "0000:02:00.0">  /sys/bus/pci/drivers/e1000e/unbind
  >  echo -n "0000:02:00.1">  /sys/bus/pci/drivers/e1000e/unbind
  >  echo -n "0000:02:00.0">  /sys/bus/pci/drivers/pciback/new_slot
  >  echo -n "0000:02:00.1">  /sys/bus/pci/drivers/pciback/new_slot
  >  echo -n "0000:02:00.0">  /sys/bus/pci/drivers/pciback/bind
  >  echo -n "0000:02:00.1">  /sys/bus/pci/drivers/pciback/bind

5. In guest (ttylinux) configure file, I use the following setting.
pci=[ '02:00.0', '02:00.1' ]

6. After ttylinux booted, I saw two Intel NICs. The IP address was
obtained automatically. See the attached image file.

Same as what Konrad has mentioned, I would recommend two things: i)
instead of passthru HDA, try other independent PCIe devices first (such
as NICs); ii) configure the passthru devices in guest configure file,
instead of use it a hot-plug device. I can send you my guest configure
file if you need it.

PS: I am pretty confident HDA passthru work because I tested it on an
desktop system before. Here is the list of devices I have passthru to a
Win7 guest VM on that system: (1) USB keyboard and mouse; (2) HDA audio;
(3) ATI graphics.


Konrad Rzeszutek Wilk wrote:
On Thu, Jun 17, 2010 at 12:09:31AM +0200, Jens Krehbiel-Gräther wrote:

I now have a Asus Crosshair IV for testing and this board (as I
postet earlier) supports iommu. Now I have installed Debian lenny
(5.0) and compiled xen 4.0.0.
Xen is running now and I have installed a hvm debian lenny to which
I would like to bind a pci device but that doesn't work.
Perhaps I am doing something wrong and you could help me?

Is that the _only_ PCI device you have tried to assign? Did you try to
assign other PCI devices which have the function number being zero?
and xm dmesg this:

(XEN) domctl.c:853:d0 XEN_DOMCTL_assign_device: assign device
(0:14.2) failed

That is not very useful. Wish it gave you the return code at least.
If you are comfortable with adding printks in the Xen hypervisor I
would modify it a bit to see what was the 'ret' value and why
'intel_iommu_assign_device' function failed.

So can anyone tell me what I am doing wrong??

Please also attach the full serial long, including the Xen one - and run
it with 'loglvl=all iommu=verbose'.

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