[PATCH RFC v2 00/16] vfio-user implementation

[Elena Ufimtseva]

Hi

This is v2 of the RFC patches for vfio-user multi-process QEMU project[1].

Thank you for the review of v1 of the RFC patches.

vfio-user is a protocol that allows a device to be emulated in a separate
process outside of QEMU. It encapsulates the messages sent from QEMU to the
kernel VFIO driver, and sends them to a remote process over a UNIX socket.

The vfio-user framework consists of 3 parts:
 1) The protocol specification.
 2) A server - the VFIO generic device in QEMU that exchanges the protocol 
messages with the client.
 3) A client - remote process that emulates a device.

This patchset implements parts 1 and 2.
The protocol's specification can be found here [2]:
We also include this as the first patch of the series.

The libvfio-user project (https://github.com/nutanix/libvfio-user)
can be used by a remote process to handle the protocol to implement the
third part.
We also worked on implementing a client and will be sending this patch
series shortly.

Contributors:

John G Johnson <john.g.johnson@oracle.com>
John Levon <john.levon@nutanix.com>
Thanos Makatos <thanos.makatos@nutanix.com>
Elena Ufimtseva <elena.ufimtseva@oracle.com>
Jagannathan Raman <jag.raman@oracle.com>

 Changes in v2:
 - combine some patches with relevant functionality.
 - use SocketAddress with idea to modify later the command line options.
 - define protocol bits in user-protocol.h.
 - use QEMU_LOCK_GUARD where appropriate.
 - fix the locking when event signaling.
 - do not drop BQL on dma map/unmap.
 - added checks for message sizes in communication functions.

John Johnson (15):
  vfio-user: add VFIO base abstract class
  vfio-user: Define type vfio_user_pci_dev_info
  vfio-user: connect vfio proxy to remote server
  vfio-user: define VFIO Proxy and communication functions
  vfio-user: negotiate version with remote server
  vfio-user: get device info
  vfio-user: get region info
  vfio-user: region read/write
  vfio-user: pci_user_realize PCI setup
  vfio-user: get and set IRQs
  vfio-user: proxy container connect/disconnect
  vfio-user: dma map/unmap operations
  vfio-user: dma read/write operations
  vfio-user: pci reset
  vfio-user: migration support

Thanos Makatos (1):
  vfio-user: introduce vfio-user protocol specification

 docs/devel/index.rst          |    1 +
 docs/devel/vfio-user.rst      | 1809 +++++++++++++++++++++++++++++++++
 hw/vfio/pci.h                 |   25 +-
 hw/vfio/user-protocol.h       |  210 ++++
 hw/vfio/user.h                |   95 ++
 include/hw/vfio/vfio-common.h |    9 +
 hw/vfio/common.c              |  296 +++++-
 hw/vfio/migration.c           |   34 +-
 hw/vfio/pci.c                 |  571 +++++++++--
 hw/vfio/user.c                | 1104 ++++++++++++++++++++
 MAINTAINERS                   |   11 +
 hw/vfio/meson.build           |    1 +
 12 files changed, 4062 insertions(+), 104 deletions(-)
 create mode 100644 docs/devel/vfio-user.rst
 create mode 100644 hw/vfio/user-protocol.h
 create mode 100644 hw/vfio/user.h
 create mode 100644 hw/vfio/user.c

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