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about the current status of Multi-process QEMU / out-of-process emulatio


From: Yu Zhang
Subject: about the current status of Multi-process QEMU / out-of-process emulation
Date: Fri, 3 Jun 2022 12:58:57 +0200

Hi All,

I saw that you authored the QEMU page for "Multi-process QEMU". (https://www.qemu.org/docs/master/system/multi-process.html)

I'm interested in this feature, but feel a little confused with the command line:

+      /usr/bin/qemu-system-x86_64                                        \
+      -machine x-remote                                                  \
+      -device lsi53c895a,id=lsi0                                         \
+      -drive id=drive_image2,file=/build/ol7-nvme-test-1.qcow2           \
+      -device scsi-hd,id=drive2,drive=drive_image2,bus=lsi0.0,scsi-id=0  \
+      -object x-remote-object,id=robj1,devid=lsi1,fd=4,
(https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg02887.html)

It seems that the man page of qemu command contains no parameter and option yet for this feature. May I know whether is it still in experimental stage? And even a few more questions:

- Is "x-remote" a standalone machine type for creating the orchestrator?
- Can each device has a dedicated emulation process or shares one process for emulating multiple devices?
- Are there more command line examples illustrating the combination of orchestrator, remote emulation process, memory-backend-memfd and x-pci-proxy-dev?

Thank you very much
Kind regard

Yu Zhang @ IONOS Compute Platform
03.06.2022

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