I'm trying to pass through a 4-port PCIe serial card to a Windows-based HVM
domU, but am getting the error "Failed to assign device to IOMMU" when I try to
power on the domU. I'm running openSuSE 11.3, Xen 4.0.0 with kernel
2.6.34.4-0.1-xen. I have the following options specified on the Linux kernel
module boot line:
pciback.hide=(04:00.0)(05:00.0)(05:00.1) pci=resource_alignment=05:00.0
The pciback module is loaded correctly, and correctly seizes all of the devices
specified. If I look at lspci information, I see the following:
pt-r310-4:~ # lspci -vt
-[0000:00]-+-00.0 Intel Corporation Core Processor DMI
+-03.0-[04-05]----00.0-[05]--+-00.0 Perle Systems Ltd Device 0331
| \-00.1 Perle Systems Ltd Device 0331
Looking at it without the -t option shows that 00:03.0 is my PCIe slot, 04:00.0
is some sort of Perle PCIe to PCI bridge:
04:00.0 PCI bridge: PLX Technology, Inc. PEX8112 x1 Lane PCI Express-to-PCI
Bridge (rev aa)
05:00.0 is the serial controller, and 05:00.1 is another bridge of some sort.
The serial controller is the one I'm really interested in passing in, and the
one that generates this error. If I just specify 05:00.1, I don't get any
errors, but the domU dies immediately after startup. If I specify the 04:00.0
bridge, I get an error that the device is not owned by PCI Back or pci-stub,
even though the output of lspci -v says that it is.
Any hints would be appreciated - I saw some similar issues regarding network
card passthrough, but no apparent solutions.
Thanks,
Nick
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