Merge remote-tracking branch 'remotes/awilliam/tags/vfio-updates-20161031.0' into staging

VFIO updates 2016-10-31

 - Replace skip_dump with ram_device to denote device memory and mark
   as non-direct to avoid memcpy to MMIO - fixes RTL (Alex Williamson)
 - Skip zero-length sparse mmaps - avoids unnecessary warning
   (Alex Williamson)
 - Clear BARs on reset so guest doesn't assume programming on return
   from S3 (Ido Yariv)
 - Enable sub-page MMIO mmaps - performance improvement for devices
   with smaller BARs, iff both host and guest map them to full,
   aligned pages (Yongji Xie)

# gpg: Signature made Mon 31 Oct 2016 17:26:47 GMT
# gpg:                using RSA key 0x239B9B6E3BB08B22
# gpg: Good signature from "Alex Williamson <alex.williamson@redhat.com>"
# gpg:                 aka "Alex Williamson <alex@shazbot.org>"
# gpg:                 aka "Alex Williamson <alwillia@redhat.com>"
# gpg:                 aka "Alex Williamson <alex.l.williamson@gmail.com>"
# Primary key fingerprint: 42F6 C04E 540B D1A9 9E7B  8A90 239B 9B6E 3BB0 8B22

* remotes/awilliam/tags/vfio-updates-20161031.0:
  vfio: Add support for mmapping sub-page MMIO BARs
  vfio/pci: fix out-of-sync BAR information on reset
  vfio: Handle zero-length sparse mmap ranges
  memory: Don't use memcpy for ram_device regions
  memory: Replace skip_dump flag with "ram_device"

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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