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charset="utf-8" From: Elena Ufimtseva Adds documentation explaining the command-line arguments needed to use multi-process. Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Reviewed-by: Stefan Hajnoczi --- docs/multi-process.rst | 64 ++++++++++++++++++++++++++++++++++++++++++++++= ++++ MAINTAINERS | 1 + 2 files changed, 65 insertions(+) create mode 100644 docs/multi-process.rst diff --git a/docs/multi-process.rst b/docs/multi-process.rst new file mode 100644 index 0000000..46bb0ca --- /dev/null +++ b/docs/multi-process.rst @@ -0,0 +1,64 @@ +Multi-process QEMU +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +This document describes how to configure and use multi-process qemu. +For the design document refer to docs/devel/qemu-multiprocess. + +1) Configuration +---------------- + +multi-process is enabled by default for targets that enable KVM + + +2) Usage +-------- + +Multi-process QEMU requires an orchestrator to launch. + +Following is a description of command-line used to launch mpqemu. + +* Orchestrator: + + - The Orchestrator creates a unix socketpair + + - It launches the remote process and passes one of the + sockets to it via command-line. + + - It then launches QEMU and specifies the other socket as an option + to the Proxy device object + +* Remote Process: + + - QEMU can enter remote process mode by using the "remote" machine + option. + + - The orchestrator creates a "remote-object" with details about + the device and the file descriptor for the device + + - The remaining options are no different from how one launches QEMU with + devices. + + - Example command-line for the remote process is as follows: + + /usr/bin/qemu-system-x86_64 \ + -machine x-remote \ + -device lsi53c895a,id=3Dlsi0 = \ + -drive id=3Ddrive_image2,file=3D/build/ol7-nvme-test-1.qcow2 = \ + -device scsi-hd,id=3Ddrive2,drive=3Ddrive_image2,bus=3Dlsi0.0,scsi-i= d=3D0 \ + -object x-remote-object,id=3Drobj1,devid=3Dlsi1,fd=3D4, + +* QEMU: + + - Since parts of the RAM are shared between QEMU & remote process, a + memory-backend-memfd is required to facilitate this, as follows: + + -object memory-backend-memfd,id=3Dmem,size=3D2G + + - A "x-pci-proxy-dev" device is created for each of the PCI devices emul= ated + in the remote process. A "socket" sub-option specifies the other end of + unix channel created by orchestrator. The "id" sub-option must be spec= ified + and should be the same as the "id" specified for the remote PCI device + + - Example commandline for QEMU is as follows: + + -device x-pci-proxy-dev,id=3Dlsi0,socket=3D3 diff --git a/MAINTAINERS b/MAINTAINERS index d50b75c..da7f735 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3179,6 +3179,7 @@ M: Jagannathan Raman M: John G Johnson S: Maintained F: docs/devel/multi-process.rst +F: docs/multi-process.rst =20 Build and test automation ------------------------- --=20 1.8.3.1