> Boris, are you suggesting the for pre-3.2 kernels, the fix is to backport the 
> 3.2 fix (i.e commit 
> 5fbdc10395cd500d6ff844825a918c4e6f38de37, remove XEN_PLATFORM_PCI config 
> option)? 

No , I am not suggesting this back port.
XEN_PLATFORM_PCI should be equal "y" for Oneiric kernels (3.0.X), (3.1.X)

> From memory, I think on 3.1 Oneiric, CONFIG_XEN_BLKDEV_FRONTEND=y, 
> CONFIG_XEN_NETDEV_FRONTEND=y are already fixed

I don't  think so. Please view :-

boris@boris-System-P5Q3:/boot$ cat config-3.0.0-13-generic | grep XEN
CONFIG_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=128
CONFIG_XEN_SAVE_RESTORE=y
# CONFIG_XEN_DEBUG_FS is not set
# CONFIG_XEN_DEBUG is not set
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=m
CONFIG_XEN_BLKDEV_FRONTEND=m <= not fixed
CONFIG_XEN_BLKDEV_BACKEND=m
CONFIG_NETXEN_NIC=m
CONFIG_XEN_NETDEV_FRONTEND=m <=  not fixed
CONFIG_XEN_NETDEV_BACKEND=m
CONFIG_INPUT_XEN_KBDDEV_FRONTEND=m
CONFIG_HVC_XEN=y
CONFIG_XEN_WDT=m
CONFIG_XEN_FBDEV_FRONTEND=m
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=m
CONFIG_XEN_BACKEND=y
CONFIG_XENFS=m
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_XENBUS_FRONTEND=m
CONFIG_XEN_GNTDEV=m
CONFIG_XEN_GRANT_DEV_ALLOC=m
CONFIG_XEN_PLATFORM_PCI=m
CONFIG_SWIOTLB_XEN=y

I am just saying , that due to Precise will go with 3.2.X kernel,  issue is 
already closed upstream
I've already tested Precise (11/26/11) as PV-on-HVM at Xen 4.1.2 Oneiric Dom0.
It works as expected. Ubuntu has nothing to fix with this kernel.

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https://bugs.launchpad.net/bugs/886521

Title:
  CONFIG_XEN_PLATFORM_PCI should be "y" when building  3.1 kernel

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