PCI Shared memory device

Latest patch for PCI shared memory device that maps a host shared memory object
to be shared between guests

new in this series
    - moved to single Doorbell register and use datamatch to trigger different
      VMs rather than one register per eventfd
    - remove writing arbitrary values to eventfds.  Only values of 1 are now
      written to ensure correct usage

Cam Macdonell (3):
  Device specification for shared memory PCI device
  Support adding a file to qemu's ram allocation
  Inter-VM shared memory PCI device

 Makefile.target                    |    3 +
 cpu-common.h                       |    1 +
 docs/specs/ivshmem_device_spec.txt |   85 +++++
 exec.c                             |   33 ++
 hw/ivshmem.c                       |  700 ++++++++++++++++++++++++++++++++++++
 qemu-char.c                        |    6 +
 qemu-char.h                        |    3 +
 7 files changed, 831 insertions(+), 0 deletions(-)
 create mode 100644 docs/specs/ivshmem_device_spec.txt
 create mode 100644 hw/ivshmem.c

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