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Re: [PATCH v9 00/20] Initial support for multi-process Qemu
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v9 00/20] Initial support for multi-process Qemu |
Date: |
Wed, 23 Sep 2020 11:47:51 -0400 |
On Thu, Aug 27, 2020 at 11:12:11AM -0700, elena.ufimtseva@oracle.com wrote:
> From: Elena Ufimtseva <elena.ufimtseva@oracle.com>
>
> Hello
>
> This is the v9 of the patchset. Thank you very much for the
> detailed feedback for v8. We appreciate your time. We believe
> we have address all the comments for v8 in the current series.
> Special thanks to Stefan Hajnoczi.
I think overall it's in a good shape.
IIUC migration isn't supported yet so needs to be blocked.
But otherwise I don't see why we won't merge this and
interate on features upstream.
> The v9 has the following changes:
> - Communication channel. Qemu side uses blocking call to send
> and receive the message from the remote and cannot progress
> further until the remote side replies. Enhanced the
> communication channel by dropping iothread lock before blocking
> on Qemu end. Use the co-routines on the remote end to avoid
> blocking QMP monitor;
> - removed the heartbeat functionality, it will be added later
> in a full extent;
> - fixed leaked errors and similar fixes;
> - eliminated bytestream passing over the channel;
> - The build system had to be changed in order to accomodate the
> latest changes in Qemu to use Kconfig/mason.
>
> To touch upon the history of this project, we posted the
> Proof Of Concept patches before the BoF session in 2018.
> Subsequently, we posted 8 versions on the qemu-devel mailist.
> You can find them by following the links below ([1] - [8]).
>
> Following people contributed to the design and
> implementation of this project:
> Jagannathan Raman <jag.raman@oracle.com>
> Elena Ufimtseva <elena.ufimtseva@oracle.com>
> John G Johnson <john.g.johnson@oracle.com>
> Stefan Hajnoczi <stefanha@redhat.com>
> Konrad Wilk <konrad.wilk@oracle.com>
> Kanth Ghatraju <kanth.ghatraju@oracle.com>
>
> We would like to thank QEMU community for your feedback in the
> design and implementation of this project.
>
> Qemu wiki page:
> https://wiki.qemu.org/Features/MultiProcessQEMU
>
> For the full concept writeup about QEMU multi-process, please refer to
> docs/devel/qemu-multiprocess.rst. Also see docs/qemu-multiprocess.txt for
> usage information.
>
> We welcome all your ideas, concerns, and questions for this patchset.
>
> [POC]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg566538.html
> [1]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg602285.html
> [2]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg624877.html
> [3]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg642000.html
> [4]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg655118.html
> [5]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg682429.html
> [6]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg697484.html
> [7]: https://patchew.org/QEMU/cover.1593273671.git.elena.ufimtseva@oracle.com/
> [8]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg727007.html
>
> Elena Ufimtseva (8):
> multi-process: add qio channel function to transmit
> multi-process: define MPQemuMsg format and transmission functions
> multi-process: define transmission functions in remote
> multi-process: introduce proxy object
> multi-process: add proxy communication functions
> multi-process: Forward PCI config space acceses to the remote process
> multi-process: perform device reset in the remote process
> multi-process: add configure and usage information
>
> Jagannathan Raman (11):
> memory: alloc RAM from file at offset
> multi-process: Add config option for multi-process QEMU
> multi-process: setup PCI host bridge for remote device
> multi-process: setup a machine object for remote device process
> multi-process: Initialize message handler in remote device
> multi-process: Associate fd of a PCIDevice with its object
> multi-process: setup memory manager for remote device
> multi-process: PCI BAR read/write handling for proxy & remote
> endpoints
> multi-process: Synchronize remote memory
> multi-process: create IOHUB object to handle irq
> multi-process: Retrieve PCI info from remote process
>
> John G Johnson (1):
> multi-process: add the concept description to
> docs/devel/qemu-multiprocess
>
> MAINTAINERS | 26 +
> backends/hostmem-memfd.c | 2 +-
> configure | 10 +
> docs/devel/index.rst | 1 +
> docs/devel/multi-process.rst | 966 ++++++++++++++++++++++++++++++++
> docs/multi-process.rst | 67 +++
> exec.c | 11 +-
> hw/i386/meson.build | 5 +
> hw/i386/remote-iohub.c | 123 ++++
> hw/i386/remote-memory.c | 58 ++
> hw/i386/remote-msg.c | 263 +++++++++
> hw/i386/remote-obj.c | 140 +++++
> hw/i386/remote.c | 79 +++
> hw/misc/ivshmem.c | 3 +-
> hw/pci-host/meson.build | 1 +
> hw/pci-host/remote.c | 75 +++
> hw/pci/memory-sync.c | 210 +++++++
> hw/pci/meson.build | 3 +
> hw/pci/proxy.c | 363 ++++++++++++
> include/exec/memory.h | 2 +
> include/exec/ram_addr.h | 2 +-
> include/hw/i386/remote-iohub.h | 42 ++
> include/hw/i386/remote-memory.h | 19 +
> include/hw/i386/remote-obj.h | 42 ++
> include/hw/i386/remote.h | 35 ++
> include/hw/pci-host/remote.h | 31 +
> include/hw/pci/memory-sync.h | 27 +
> include/hw/pci/pci_ids.h | 3 +
> include/hw/pci/proxy.h | 54 ++
> include/io/channel.h | 24 +
> include/io/mpqemu-link.h | 110 ++++
> include/qemu/mmap-alloc.h | 3 +-
> io/channel.c | 45 ++
> io/meson.build | 2 +
> io/mpqemu-link.c | 347 ++++++++++++
> meson.build | 1 +
> scripts/mpqemu-launcher.py | 49 ++
> softmmu/memory.c | 3 +-
> util/mmap-alloc.c | 7 +-
> util/oslib-posix.c | 2 +-
> 40 files changed, 3243 insertions(+), 13 deletions(-)
> create mode 100644 docs/devel/multi-process.rst
> create mode 100644 docs/multi-process.rst
> create mode 100644 hw/i386/remote-iohub.c
> create mode 100644 hw/i386/remote-memory.c
> create mode 100644 hw/i386/remote-msg.c
> create mode 100644 hw/i386/remote-obj.c
> create mode 100644 hw/i386/remote.c
> create mode 100644 hw/pci-host/remote.c
> create mode 100644 hw/pci/memory-sync.c
> create mode 100644 hw/pci/proxy.c
> create mode 100644 include/hw/i386/remote-iohub.h
> create mode 100644 include/hw/i386/remote-memory.h
> create mode 100644 include/hw/i386/remote-obj.h
> create mode 100644 include/hw/i386/remote.h
> create mode 100644 include/hw/pci-host/remote.h
> create mode 100644 include/hw/pci/memory-sync.h
> create mode 100644 include/hw/pci/proxy.h
> create mode 100644 include/io/mpqemu-link.h
> create mode 100644 io/mpqemu-link.c
> create mode 100755 scripts/mpqemu-launcher.py
>
> --
> 2.25.GIT
- Re: [PATCH v9 00/20] Initial support for multi-process Qemu,
Michael S. Tsirkin <=