2022-03-30 Project Stratos Meeting

Date

Mar 30, 2022

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: https://linaro.atlassian.net/browse/STR-79
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