[PATCH RFC 00/19] vfio-user implementation

[Elena Ufimtseva]

Hi

We are happy to introduce the next stage of the multi-process QEMU project[1].

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>

Please send your comments and questions!

Thank you.

References:
[1] https://wiki.qemu.org/Features/MultiProcessQEMU
[2] 
https://patchwork.kernel.org/project/qemu-devel/patch/20210614104608.212276-1-thanos.makatos@nutanix.com/

John G Johnson (18):
  vfio-user: add VFIO base abstract class
  vfio-user: define VFIO Proxy and communication functions
  vfio-user: Define type vfio_user_pci_dev_info
  vfio-user: connect vfio proxy to remote server
  vfio-user: negotiate protocol with remote server
  vfio-user: define vfio-user pci ops
  vfio-user: VFIO container setup & teardown
  vfio-user: get device info and get irq info
  vfio-user: device region read/write
  vfio-user: get region and DMA map/unmap operations
  vfio-user: probe remote device's BARs
  vfio-user: respond to remote DMA read/write requests
  vfio_user: setup MSI/X interrupts and PCI config operations
  vfio-user: vfio user device realize
  vfio-user: pci reset
  vfio-user: probe remote device ROM BAR
  vfio-user: migration support
  vfio-user: add migration cli options and version negotiation

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.h                |  279 +++++
 include/hw/vfio/vfio-common.h |    8 +
 hw/vfio/common.c              |  273 ++++-
 hw/vfio/migration.c           |   35 +-
 hw/vfio/pci.c                 |  547 ++++++++--
 hw/vfio/user.c                |  997 ++++++++++++++++++
 MAINTAINERS                   |   10 +
 hw/vfio/meson.build           |    1 +
 11 files changed, 3879 insertions(+), 106 deletions(-)
 create mode 100644 docs/devel/vfio-user.rst
 create mode 100644 hw/vfio/user.h
 create mode 100644 hw/vfio/user.c

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2.25.1