From: Elena Ufimtseva <elena.ufimts...@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. 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.ra...@oracle.com> Elena Ufimtseva <elena.ufimts...@oracle.com> John G Johnson <john.g.john...@oracle.com> Stefan Hajnoczi <stefa...@redhat.com> Konrad Wilk <konrad.w...@oracle.com> Kanth Ghatraju <kanth.ghatr...@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.ufimts...@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
