QEMU 8.0

by neustradamus on 4/24/2023, 2:48 PM with 33 comments
  • by rlyshw on 4/24/2023, 5:28 PM

    Cool. I've actually been playing with QEMU internals a lot recently. Specifically with the multi-process experimental features. Although I can't seem to find any consistency on where the main project is headed. They admit that the documentation pages can be well out-of-date with the upstream implementations, but they seem split-brained even within the code.

    The main project ships with the multi-process qemu approach, mostly defined in their docs: https://www.qemu.org/docs/master/system/multi-process.html https://www.qemu.org/docs/master/devel/multi-process.html

    But I saw some update buried in a mailing list that development of the multi-process system has been superseded by vfio-user, mostly led by nutanix: https://github.com/nutanix/libvfio-user

    The nutanix repo refers to an oracle-led fork of qemu with the full vfio-user implementation built-in: https://github.com/oracle/qemu

    So, they're still separate projects, right? Well, kinda. the mainline project has the vfio-user-server implementation merged in: https://github.com/qemu/qemu/blob/ac5f7bf8e208cd7893dbb1a952...

    But not the client side (vfio-user-pci). So, the feature is half-baked in the mainline project.

    I don't know if any of the qemu devs browse HN but it would be nice to hear more about the plans for vfio-user.

  • by kissiel on 4/24/2023, 4:07 PM

    "Since version 3.0.0, QEMU uses a time based version numbering scheme: major incremented by 1 for the first release of the year minor reset to 0 with every major increment, otherwise incremented by 1 for each release from git master micro always 0 for releases from git master, incremented by 1 for each stable branch release" If I'm reading this right, "master" has more significant part than stable... This feels wrong. What am I missing?

  • by orra on 4/24/2023, 3:19 PM

    > x86: support for Xen guests under KVM with Linux v5.12+

    Clearly I haven't been keeping up, because this is a bit of a surprise. Xen under KVM? Those things are polar opposites!

  • by tryauuum on 4/24/2023, 3:04 PM

    experimental VFIO migration? I guess this will make easier to migrate a VM with GPU workload from host to host without interrupting it

  • by vrglvrglvrgl on 4/24/2023, 3:19 PM

    [dead]