Date

30 Mar 2022

 Participants

List meeting participants using their @ mention names

• Alex Bennée

• Mathieu Poirier

• Bill Mills

• Arnd Bergmann

• Viresh Kumar

• Mike Holmes

• Matt Spencer

• Vincent Guittot

• Christopher Clark

• Don Harbin

• Peter Griffin

• Srinivas Ramana

• Tim Benton

• François Ozog (Deactivated)

• Randy Linnell

 Agenda

 Discussion

• VK: Rust based i2c on Xen, PoC

  • Dom0 host kernel, with backend

  • DomU guest kernel

  • vhost-master from crate + bits from cloud hypervisor

  • linked in with EPAMs PoC virtio work

• AB: we could create a shadow FD after the fact and pass that

• AJB: any example of this

• AB: KVM?

• AJB: talked about irqfd/eventfs redirection:

• AB: You can have FD sharing the vma sctructure

  • similar to fork semantics

• MP: xen-sys crate double buffering working

  • nested memory buffers

  • now looking at Xen Foreign Map API

• CC: hasn’t been able to talk to Doug

  • had changes been addressed?

  • MP: yes

  • MP: quiet since Jan

  • what about the Xen Test Framework

  • MP: only used to exercise the hypercalls

• MP: basically want to know if he cares to go on

• AJB: talked about our thoughts about where to host repo

  • we are ering towards hosting it in rust-vmm

• CC: like the idea of being maintained in the community

• BM: Where any changes available to the guest

  • AJB:

• BM: when do we get to virtio-iommu?

  • needed for the limited memory interface

• AB: thinks the iommu translation gets in the way

  • would need new code to support this in guest kernel

• BM: fixed region will be the first limited memory visibility

  • will be used for the A/R hetrogenous modesl

• VG: fixed region works well but SCMI only uses small descriptors

• AB: still need copy in copy out

• AB: iommu models makes more sense for fixed maps

  • e.g. static frame buffers

  • stable mappings

• AB: some progress being made on fat virtqueue

 Action items

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 Decisions

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