Hello,
The progress has been a bit slower since past few months (because of
relocation to other stuff), but some progress was made (mostly around
AMD's AMP stuff).
- Rebased AMP Sapphire and generic PCI virtio-msg drivers (from
Edgar/Bill) over latest virtio-msg repository and made few changes
to make them work again.
- Tested the generic PCI version with help of Edgar's QEMU based
setup. I have received the physical board recently, will try to test
with that next.
- Made significant changes to both the drivers to bring them closer to
how virtio-msg FFA and loopback drivers look. Also redesigned driver
initialization and fixed how Ping implementation was working.
- Eventually the code was much cleaner and much shorter.
- The implementation was based on a simple predefined (fixed) single
producer - single consumer queue. Bill/Edgar documented [1] a new
shared memory layout earlier but was never implemented. Implemented
the first version of that for both Linux and QEMU.
--
viresh
[1] https://github.com/wmamills/hvac-demo/blob/main/notes/amp-data-structures.h
Hi Everyone,
I have a first PoC showing virtio-msg working with a loopback system between Linux kernel and Qemu.
The patches, build and run instructions can be found here:
https://github.com/bertrand-marquis/virtio-msg-spec/tree/linux-poc/v0/linux…
This is very early stage but this shows a fully functional version with rng and block validated.
I used ChatGPT help to fix issues and write part of the code (or big parts for Qemu) and this is far from upstreamable so
do not share that.
I will share a v1 in the next weeks with FF-A support but i still have some timings and DMA issues to solve.
Any comment on this is more than welcome !!
Cheers
Bertrand
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