[Qemu-devel] [PATCH v8 0/5] Inter-VM Shared Memory Device

[Cam Macdonell]

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

new in this series

    v8
    - rebased to qemu.git
    - added qemu_ram_alloc_from_ptr() function
    - removed irqfd support as support functions are not yet in qemu

    v7
    - replace marking memory from v6 with marking device as unmigratable 
indicating
      that it should be unplugged before migration and re-added after.
    - 'peer' case changed to require removal before migration, only 'master'
      devices can be migrated while attached.

    v6
    - migration support with 'master' and 'peer' roles for guest to determine
      who "owns" memory
    - modified phys_ram_dirty array for marking memory as not to be migrated

    v5:
    - fixed segfault for non-server case
    - code style fixes
    - removed limit on the number of guests
    - shared memory server is now in qemu.git/contrib
    - made ioeventfd setup function generic
    - removed interrupts when guest joined (let application handle it)

    v4:
    - 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 (5):
  Provide a function to add an allocated region of memory to the qemu
    RAM.
  Device specification for shared memory PCI device
  Add function to assign ioeventfd to MMIO.
  Support marking a device as non-migratable
  Inter-VM shared memory PCI device

 Makefile.target                    |    3 +
 cpu-common.h                       |    2 +
 docs/specs/ivshmem_device_spec.txt |   96 ++++
 exec.c                             |   43 ++
 hw/hw.h                            |    2 +
 hw/ivshmem.c                       |  834 ++++++++++++++++++++++++++++++++++++
 kvm-all.c                          |   32 ++
 kvm.h                              |    1 +
 qemu-char.c                        |    6 +
 qemu-char.h                        |    3 +
 qemu-doc.texi                      |   43 ++
 savevm.c                           |   44 ++-
 12 files changed, 1106 insertions(+), 3 deletions(-)
 create mode 100644 docs/specs/ivshmem_device_spec.txt
 create mode 100644 hw/ivshmem.c