[RFC v4 PATCH 00/49] Initial support of multi-process qemu

[Jagannathan Raman <jag.raman@oracle.com>]

Started with the presentation in October 2017 made by Marc-Andre (Red Hat)
and Konrad Wilk (Oracle) [1], and continued by Jag's BoF at KVM Forum 2018,
the multi-process project is now a prototype and presented in this patchset.
John & Elena will present the status of this project in KVM Forum 2019.

This first series enables the emulation of lsi53c895a in a separate process.

We posted the Proof Of Concept patches [2] before the BoF session in 2018.
Subsequently, we posted RFC v1 [3], RFC v2 [4] and RFC v3 [5] of this series. 

We want to present version 4 of this series, which incorporates the feedback
we received for v3 & adds support for live migrating the remote process.

Following people contributed to this patchset:

John G Johnson <john.g.johnson@oracle.com>
Jagannathan Raman <jag.raman@oracle.com>
Elena Ufimtseva <elena.ufimtseva@oracle.com>
Kanth Ghatraju <kanth.ghatraju@oracle.com>

For full concept writeup about QEMU disaggregation refer to
docs/devel/qemu-multiprocess.rst. Please refer to 
docs/qemu-multiprocess.txt for usage information.

We are planning on making the following improvements in the future:
 - Performance improvements
 - Libvirt support
 - Enforcement of security policies
 - blockdev support

We welcome all your ideas, concerns, and questions for this patchset.

Thank you!

[1]: http://events17.linuxfoundation.org/sites/events/files/slides/KVM%20FORUM%20multi-process.pdf
[1]: https://www.youtube.com/watch?v=Kq1-coHh7lg
[2]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg566538.html
[3]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg602285.html
[4]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg624877.html
[5]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg642000.html

Elena Ufimtseva (22):
  multi-process: add a command line option for debug file
  multi-process: introduce proxy object
  mutli-process: build remote command line args
  multi-process: configure remote side devices
  multi-process: add qdev_proxy_add to create proxy devices
  multi-process: remote: add setup_devices and setup_drive msg
    processing
  multi-process: remote: use fd for socket from parent process
  multi-process: remote: add create_done condition
  multi-process: add processing of remote drive and device command line
  multi-process: refractor vl.c code to re-use in remote
  multi-process: add remote option
  multi-process: add remote options parser
  multi-process: add parse_cmdline in remote process
  multi-process: send heartbeat messages to remote
  multi-process: handle heartbeat messages in remote process
  multi-process/mon: choose HMP commands based on target
  multi-process/mig: Load VMSD in the proxy object
  multi-process/mig: refactor runstate_check into common file
  multi-process/mig: Synchronize runstate of remote process
  multi-process/mig: Restore the VMSD in remote process
  multi-process: Enable support for multiple devices in remote
  multi-process: add configure and usage information

Jagannathan Raman (26):
  multi-process: memory: alloc RAM from file at offset
  multi-process: util: Add qemu_thread_cancel() to cancel running thread
  multi-process: Add stub functions to facilate build of multi-process
  multi-process: Add config option for multi-process QEMU
  multi-process: build system for remote device process
  multi-process: define mpqemu-link object
  multi-process: add functions to synchronize proxy and remote endpoints
  multi-process: setup PCI host bridge for remote device
  multi-process: setup a machine object for remote device process
  multi-process: setup memory manager for remote device
  multi-process: remote process initialization
  multi-process: PCI BAR read/write handling for proxy & remote
    endpoints
  multi-process: Add LSI device proxy object
  multi-process: Synchronize remote memory
  multi-process: create IOHUB object to handle irq
  multi-process: Introduce build flags to separate remote process code
  multi-process: Use separate MMIO communication channel
  multi-process: perform device reset in the remote process
  multi-process/mon: stub functions to enable QMP module for remote
    process
  multi-process/mon: enable QMP module support in the remote process
  multi-process/mon: Refactor monitor/chardev functions out of vl.c
  multi-process/mon: Initialize QMP module for remote processes
  multi-process: prevent duplicate memory initialization in remote
  multi-process/mig: build migration module in the remote process
  multi-process/mig: Enable VMSD save in the Proxy object
  multi-process/mig: Send VMSD of remote to the Proxy object

John G Johnson (1):
  multi-process: add the concept description to
    docs/devel/qemu-multiprocess

 Makefile                            |    2 +
 Makefile.objs                       |   39 ++
 Makefile.target                     |   94 ++-
 accel/stubs/kvm-stub.c              |    5 +
 accel/stubs/tcg-stub.c              |  106 ++++
 backends/Makefile.objs              |    2 +
 block/Makefile.objs                 |    2 +
 chardev/char.c                      |   14 +
 configure                           |   15 +
 docs/devel/index.rst                |    1 +
 docs/devel/qemu-multiprocess.rst    | 1102 +++++++++++++++++++++++++++++++++++
 docs/qemu-multiprocess.txt          |   86 +++
 exec.c                              |   14 +-
 hmp-commands-info.hx                |   10 +
 hmp-commands.hx                     |   25 +-
 hw/Makefile.objs                    |    9 +
 hw/block/Makefile.objs              |    2 +
 hw/core/Makefile.objs               |   17 +
 hw/nvram/Makefile.objs              |    2 +
 hw/pci/Makefile.objs                |    4 +
 hw/proxy/Makefile.objs              |    1 +
 hw/proxy/memory-sync.c              |  226 +++++++
 hw/proxy/proxy-lsi53c895a.c         |   97 +++
 hw/proxy/qemu-proxy.c               |  807 +++++++++++++++++++++++++
 hw/scsi/Makefile.objs               |    2 +
 include/chardev/char.h              |    1 +
 include/exec/address-spaces.h       |    2 +
 include/exec/ram_addr.h             |    2 +-
 include/hw/pci/pci_ids.h            |    3 +
 include/hw/proxy/memory-sync.h      |   51 ++
 include/hw/proxy/proxy-lsi53c895a.h |   42 ++
 include/hw/proxy/qemu-proxy.h       |  125 ++++
 include/hw/qdev-core.h              |    2 +
 include/io/mpqemu-link.h            |  214 +++++++
 include/monitor/monitor.h           |    2 +
 include/monitor/qdev.h              |   25 +
 include/qemu-common.h               |    8 +
 include/qemu/log.h                  |    1 +
 include/qemu/mmap-alloc.h           |    3 +-
 include/qemu/thread.h               |    1 +
 include/remote/iohub.h              |   63 ++
 include/remote/machine.h            |   48 ++
 include/remote/memory.h             |   34 ++
 include/remote/pcihost.h            |   59 ++
 include/sysemu/runstate.h           |    3 +
 io/Makefile.objs                    |    2 +
 io/mpqemu-link.c                    |  351 +++++++++++
 memory.c                            |    2 +-
 migration/Makefile.objs             |   12 +
 migration/savevm.c                  |   63 ++
 migration/savevm.h                  |    3 +
 monitor/Makefile.objs               |    3 +
 monitor/misc.c                      |   84 +--
 monitor/monitor-internal.h          |   38 ++
 monitor/monitor.c                   |   83 ++-
 net/Makefile.objs                   |    2 +
 qapi/Makefile.objs                  |    2 +
 qdev-monitor.c                      |  270 ++++++++-
 qemu-options.hx                     |   21 +
 qom/Makefile.objs                   |    4 +
 remote/Makefile.objs                |    6 +
 remote/iohub.c                      |  159 +++++
 remote/machine.c                    |  133 +++++
 remote/memory.c                     |   99 ++++
 remote/pcihost.c                    |   85 +++
 remote/remote-main.c                |  633 ++++++++++++++++++++
 remote/remote-opts.c                |  131 +++++
 remote/remote-opts.h                |   31 +
 replay/Makefile.objs                |    2 +-
 rules.mak                           |    2 +-
 runstate.c                          |   41 ++
 scripts/hxtool                      |   44 +-
 stubs/audio.c                       |   12 +
 stubs/gdbstub.c                     |   21 +
 stubs/machine-init-done.c           |    4 +
 stubs/migration.c                   |  211 +++++++
 stubs/monitor.c                     |   72 +++
 stubs/net-stub.c                    |  121 ++++
 stubs/qapi-misc.c                   |   43 ++
 stubs/qapi-target.c                 |   49 ++
 stubs/replay.c                      |   26 +
 stubs/runstate-check.c              |    3 +
 stubs/ui-stub.c                     |  130 +++++
 stubs/vl-stub.c                     |  193 ++++++
 stubs/vmstate.c                     |   20 +
 stubs/xen-mapcache.c                |   22 +
 ui/Makefile.objs                    |    2 +
 util/log.c                          |    2 +
 util/mmap-alloc.c                   |    7 +-
 util/oslib-posix.c                  |    2 +-
 util/qemu-thread-posix.c            |   10 +
 vl-parse.c                          |  161 +++++
 vl.c                                |  310 ++++------
 vl.h                                |   54 ++
 94 files changed, 6908 insertions(+), 246 deletions(-)
 create mode 100644 docs/devel/qemu-multiprocess.rst
 create mode 100644 docs/qemu-multiprocess.txt
 create mode 100644 hw/proxy/Makefile.objs
 create mode 100644 hw/proxy/memory-sync.c
 create mode 100644 hw/proxy/proxy-lsi53c895a.c
 create mode 100644 hw/proxy/qemu-proxy.c
 create mode 100644 include/hw/proxy/memory-sync.h
 create mode 100644 include/hw/proxy/proxy-lsi53c895a.h
 create mode 100644 include/hw/proxy/qemu-proxy.h
 create mode 100644 include/io/mpqemu-link.h
 create mode 100644 include/remote/iohub.h
 create mode 100644 include/remote/machine.h
 create mode 100644 include/remote/memory.h
 create mode 100644 include/remote/pcihost.h
 create mode 100644 io/mpqemu-link.c
 create mode 100644 remote/Makefile.objs
 create mode 100644 remote/iohub.c
 create mode 100644 remote/machine.c
 create mode 100644 remote/memory.c
 create mode 100644 remote/pcihost.c
 create mode 100644 remote/remote-main.c
 create mode 100644 remote/remote-opts.c
 create mode 100644 remote/remote-opts.h
 create mode 100644 runstate.c
 mode change 100644 => 100755 scripts/hxtool
 create mode 100644 stubs/audio.c
 create mode 100644 stubs/migration.c
 create mode 100644 stubs/net-stub.c
 create mode 100644 stubs/qapi-misc.c
 create mode 100644 stubs/qapi-target.c
 create mode 100644 stubs/ui-stub.c
 create mode 100644 stubs/vl-stub.c
 create mode 100644 stubs/xen-mapcache.c
 create mode 100644 vl-parse.c
 create mode 100644 vl.h

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1.8.3.1