Re: [Xen-users] Passthrough and pci_iomul

[Steven van der Sluis <s.vandersluis@xxxxxxxxx>]

Hi,

I had the same messages for pci-passthrough for a vga device (intel IGD) and an entire usb-bus. However both worked! (see also the "registered successfuly" message).

However I have read somewhere that vga-passthrough is only possible for primary vga device and not yet secondary devices, although there seems to be success with secondary card here and there?

rgds, Steven

DISCLAIMER I cannot say that I am an experience user with Xen, I only tried it for 2 weeks, a few weeks ago.

On Tue, Feb 28, 2012 at 7:11 PM, Paul S <pstroud@xxxxxxxxx> wrote:

Environment:

ASRock z68 Extreme4

i5-2500

ATI HD 6450

Trying to run Xen Passthrough on the ATI card, while running the normal console on the internal VGA adapter.

All I ever get is a blank screen. 

This is an excerpt from the qemu-dm log:

--

dm-command: hot insert pass-through pci dev

register_real_device: Assigning real physical device 01:00.0 ...

pt_iomul_init: Error: pt_iomul_init can't open file /dev/xen/pci_iomul: No such file or directory: 0x1:0x0.0x0  

pt_register_regions: IO region registered (size=0x10000000 base_addr=0xc000000c)

pt_register_regions: IO region registered (size=0x00020000 base_addr=0xfbe20004)

pt_register_regions: IO region registered (size=0x00000100 base_addr=0x0000e001)

pt_register_regions: Expansion ROM registered (size=0x00020000 base_addr=0xfbe00000)

pt_msi_setup: msi mapped with pirq 36

pci_intx: intx=1

register_real_device: Real physical device 01:00.0 registered successfuly!

--

The pt_iomul error seems to be relevant to my problem. The /dev/xen/pci_iomul device does NOT exist:

[root@xenzibar xen]# ls /dev/xen

evtchn  gntdev

However, the rule to create the device does exist in udev rules:

[root@xenzibar rules.d]# grep iomul xen-backend.rules 

KERNEL=="pci_iomul", NAME="xen/%k", MODE="0600"

I have the devices properly detached from dom0, and attached to domU:

[root@xenzibar rules.d]# xm pci-list-assignable-devices

[root@xenzibar rules.d]# xm pci-list Windows

Vdev Device

06.0 0000:01:00.1 <- HDMI Sound

07.0 0000:01:00.0 <- Video

Here is my 'xm dmesg':

http://pastebin.com/SvW6k73R

My question is, what is the pci_iomul device, should it be created, or am I chasing a red herring? 

Thanks in advance for any assistance.

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