[Xen-users] Error while doing pass through of PCI bridge root node to guest vm

[Nagesh Lagishetty <nagesh.inst@xxxxxxxxx>]

Hi,

When i am doing passthrough of pcie bridge to guest vm, I am seeing the error as

Error: pci: PCI Backend and pci-stub don't own device 0000:01:00.0

01:00.0 PCI bridge: Integrated Device Technology, Inc. PES12T3G2 PCI Express Gen2 Switch (rev 01)

xm pci-list-assignable
0000:01:00.0
0000:04:00.0

I am not seeing this issue when i passthrough other devices which are connected to bridge (end devices)

Any restriction in passing a pcie bridge root node to guest vm?

SP2NIC:~ # lspci -t
-[0000:00]-+-00.0
ÂÂÂÂÂÂÂÂÂÂ +-01.0-[01-04]----00.0-[02-04]--+-02.0-[03]--
ÂÂÂÂÂÂÂÂÂÂ |ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ \-04.0-[04]--+-00.0
ÂÂÂÂÂÂÂÂÂÂ |ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ +-00.1
ÂÂÂÂÂÂÂÂÂÂ |ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ +-00.2
ÂÂÂÂÂÂÂÂÂÂ |ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ \-00.3
ÂÂÂÂÂÂÂÂÂÂ +-02.0
ÂÂÂÂÂÂÂÂÂÂ +-14.0

I need to access EEPROM device from guest vm, EEPROM access will be available only through the bridge root node.

Thanks

Nagesh

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