xen: bug fixes for 3.18-rc1

- Fix regression in xen_clocksource_read() which caused all Xen guests
  to crash early in boot.
- Several fixes for super rare race conditions in the p2m.
- Assorted other minor fixes.
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xen/pci: Allocate memory for physdev_pci_device_add's optarr

physdev_pci_device_add's optarr[] is a zero-sized array and therefore
reference to add.optarr[0] is accessing memory that does not belong to
the 'add' variable.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
1 file changed