[Xen-users] Passthrough and pci_iomul

[Paul S <pstroud@xxxxxxxxx>]

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.

Paul

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