(xen) stable/backend.base.v3 stable/gntalloc.v7 for 2.6.40

Hey Linus

Please git pull:

git pull git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/backend.base.v3 stable/gntalloc.v7

where stable/backend.base.v3 is based off v2.6.39-rc3 (a6360dd37e1a144ed11e6548371bade559a1e4df)
This particular patchset touches a lot of Xen code in different directories, which I could have avoided by splitting the patches in different branches. However for simplicity reasons (one branch name so much easier to keep in mind) I stuck them all in this branch.

The patchset does a couple of things:
- Allows the Xen's Machine to Frame Number (MFN) to Page Frame Number (PFN) override mechanism (which we as a way to share pages with other guests) to work with other backends. The other backend right now is the block backend, but can also be the network backend.
- Fixes compile errors if backends are compiled as modules.
- Lays out the groundwork for the PCI backend to remember which of the PCI devices are assigned to a guest if the pci backend is used.
- Lastly, exposes some of the Xen's IRQ lookup code to the pci backend so that the correct Physical IRQ (GSI or vector if MSI/MSI-X used) is provided to the guest.

The #stable/gntalloc.v7 is based of .. 38eaeb0fd8819dce424a61579500bd9987d5c930 (xen: gntdev: fix build warning), which went in at the beginning of 2.6.39. Anyhow, it just removes an unneeded flag.

The full diffstat:

 arch/x86/include/asm/xen/page.h |    5 +-
 arch/x86/include/asm/xen/pci.h  |   16 +++++++
 arch/x86/pci/xen.c              |   96 +++++++++++++++++++++++++++++++++++++--
 arch/x86/xen/p2m.c              |   13 +++---
 drivers/xen/events.c            |   39 ++++++++++++++--
 drivers/xen/gntalloc.c          |   14 +++++-
 drivers/xen/gntdev.c            |   16 ++++++-
 drivers/xen/grant-table.c       |   31 ++++++++++---
 include/xen/events.h            |    9 +++-
 9 files changed, 208 insertions(+), 31 deletions(-)

Daniel De Graaf (1):
xen/gntdev,gntalloc: Remove unneeded VM flags

Konrad Rzeszutek Wilk (8):
xen/pci: Add xen_[find|register|unregister]_device_domain_owner functions. xen/irq: Check if the PCI device is owned by a domain different than DOMID_SELF. xen/irq: Add support to check if IRQ line is shared with other domains. xen/irq: Export 'xen_pirq_from_irq' function.
xen/irq: The Xen hypervisor cleans up the PIRQs if the other domain forgot. xen/p2m/m2p/gnttab: Support GNTMAP_host_map in the M2P override. xen/p2m: Add EXPORT_SYMBOL_GPL to the M2P override functions. xen/pci: Fix compiler error when CONFIG_XEN_PRIVILEGED_GUEST is not set.