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2021-04-29 Project Stratos Sync Meeting notes

2021-04-29 Project Stratos Sync Meeting notes

Apr 29, 2021

Attendees

  • Mathieu

  • Don Harbin

  • Srinivas Kalaga

  • Vincent

  • Viresh

  • Loic

  • Peter G

  • Pratik Patel

  • Souvik

  • Srivasta

  • Arnd

  • Srinivas

  • Matt

  • Azzadine

 

Discussion items

  • Update on the in-progress work, i2c, virtio-video, address space sharing and RPMB. 

  • Update on virtio-rng & virtio-watchdog

 

Discussion Points 

Updates

  • Viresh virtio-i2c 

    • Working Rust implementation (as good or better than QEMU version)

    •  Now looking to test on another hypervisor

      • Alex: Xen (via EPAM ioreq)?

      • Srivasta: any limitations?

      • Viresh: a couple of assumptions

        • 10bit i2c not supported

        • backend assumes Linux userspace (dev interface)

        • only basic smbus commands

      • Srivasta: multiple guests accessing the same devices?

        • not tested at the moment, currently only a single socket

      • Arnd: some of that is client specific depending on guest↔slave interactions

      • Srivasta: not expecting two VMs simultaneous - ownership might be handed off over time

      • Arnd: something needs to control the hand-off between VMs

      • Sriviasta: will check back on use-cases

      • Sriviasta: how can the daemon be isolated

      • Arnd: use secomp/selinux or whatever isolation config you want

      • Azzedine: are you referring to an i2c port or an individual device?

      • Arnd: host processes with access to the node can access any device - but the kernel will arbitrate for you

      • Peter: what's the size difference

      • Virsh: rust currently 20x bigger

      • Alex: need to do a static vs static and check fro debug symbols for a like for like

  • Peter - virtio-video

    • 6/7 command left to implement

    • Peter: what userspaces to test with? ffmpeg?

    • Alex: what do browsers use?

    • Peter: Chromium has v4l built in and has a nice unit test case

    • Arnd: and the v4l test suite?

    • Peter: yes

    • Peter: and then test with real hardware...

    • RB5? Hypoervisor released

  • Arnd - Address space sharing: will start RSN now merge window out of the way

  • Alex - virtio-rpmb

    • will be copy and pasting Virsh's rust code 

  • Mathieu - virtio-rng

    • understanding the RNG backend

  • virtio-watchdog

    • is it a good backend for rust baremetal?

      • multiple guests with a centra watchdog backend

    • options - reboot the HW if any guest fails or tell the VMM

    • Azzadine: would Linaro be thw ones to push to OASIS

    • Alex: I think so

  • Vincent - virtio-scmi

    • Has a backend that supports multiple guests

    • Next step Zephry/Unicraft backend

    • Multiple QEMUs - with cpufreq over SCMI

    • Still discussing how to abstract away hypervisor difference in those case

    • Xen discussing embedded libxen

  • AOB?

 

 

Action items