xen: fix for 4.10 rc4

Linus,

Please git pull the following tag:

git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git for-linus-4.10-rc4-tag

It contains a fix for Xen running in nested virtualization environment.

Thanks.

Juergen

 drivers/xen/platform-pci.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

Stefano Stabellini (1):
partially revert "xen: Remove event channel notification through Xen PCI platform device"