2022-03-18 Project Stratos Meeting notes

 Date

Mar 18, 2022

 Participants

• @Alex Bennée

• @Mathieu Poirier

• @Stefano Stabellini

• @Vincent Guittot

• @Don Harbin

• @Azzedine Touzni

• @Catalin Udma (NXP)

• Srinivas Ramana

• @Randy Linnell

 Goals

• Mathieu: Xen Sys Crate/Goldstein

• AoB

 Discussion topics

• MP:

  • https://github.com/alexandruag/vmm-reference/commits/xen

• SS:

  • there is a difference between KVM views of VMM and Xen’s

  • IOREQ just does emulation

  • “tools” does the VM control

• SS:

  • Virtio already works on HVM guests with QEMU x86

    • but becomes non-secure

    • also very slow

    • active work from Xilinx

      • TPM emulation

      • two machine types (HVM with IOREQ) and PV (without IOREQ)

      • Vikram @ Xilinx

• MP: still not sure what the rust-vmm work is doing

• SS:

  • just the basic work for hypercalls?

• SS:

  • the toolstack is a whole bunch of issues

    • libs to make hypercalls

    • binary to start VMs

    • large code base, not liked and rewitten at least once

  • also a OCaml toolstack

  • Can both be replaced by a rust one

    • would be the 4th iteration

  • From a safety cert viewpoint

    • not even tried with the tool stack

    • likey rewrite from scartch

    • should not be a linux toolstack

• MP

  • just concentrating on the foundation

• AJB

  • outlined xen vhost-master

• VG

  • done some work on merging

• SS

  • we have the two approaches

  • EPAM work has been held up by the war

  • Was a spec question being held up on SCMI

    • Spec says DT defines device ids for SCMI

    • should be in generic device tree right?

      • difficult to make changes not used by LKML

      • push back from ARM maintainers - should be in spec?

• VG

  • just pushing back because not used by kernel

  • optee create their own bindings as well

• SS

  • we get a lot of specific DT nodes (OPTEE, Xen, Uboot are examples)

• VG

  • maybe SCMI section is the solution

• SS

 Action items

 Decisions