Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-17 Thread Stefano Stabellini
Hi Vincent, I am replying to this thread to follow-up on this morning's discussion. I am attaching the simple patch that I mentioned during the call to add event channels support to guest kernels, see xen.h. I am also attaching a toy example application that makes use of it, just to give you an

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-17 Thread Vincent Guittot
On Wed, 16 Feb 2022 at 22:45, Stefano Stabellini wrote: > > On Tue, 15 Feb 2022, Vincent Guittot wrote: > > On Tue, 8 Feb 2022 at 01:16, Stefano Stabellini > > wrote: > > > > > > On Mon, 7 Feb 2022, Alex Bennée wrote: > > > > Hi Stefano, > > > > > > > > Vincent gave an update on his virtio-scmi w

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-16 Thread Stefano Stabellini
On Tue, 15 Feb 2022, Vincent Guittot wrote: > On Tue, 8 Feb 2022 at 01:16, Stefano Stabellini > wrote: > > > > On Mon, 7 Feb 2022, Alex Bennée wrote: > > > Hi Stefano, > > > > > > Vincent gave an update on his virtio-scmi work at the last Stratos sync > > > call and the discussion moved onto next

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-15 Thread Vincent Guittot
On Sat, 12 Feb 2022 at 00:34, Stefano Stabellini wrote: > > On Fri, 11 Feb 2022, Alex Bennée wrote: > > > FYI, a good and promising approach to handle both SCMI and SCPI is the > > > series recently submitted by EPAM to mediate SCMI and SCPI requests in > > > Xen: https://marc.info/?l=xen-devel&m=

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-15 Thread Vincent Guittot
Hi Stefano, On Tue, 8 Feb 2022 at 01:16, Stefano Stabellini wrote: > > On Mon, 7 Feb 2022, Alex Bennée wrote: > > Hi Stefano, > > > > Vincent gave an update on his virtio-scmi work at the last Stratos sync > > call and the discussion moved onto next steps. > > Hi Alex, > > I don't know the specif

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-15 Thread Vincent Guittot
Hi All, Sorry for the late reply but I was off last week. I will go through the thread and try to answer open point On Mon, 7 Feb 2022 at 11:56, Alex Bennée wrote: > > > Hi Stefano, > > Vincent gave an update on his virtio-scmi work at the last Stratos sync > call and the discussion moved onto n

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-11 Thread Stefano Stabellini
On Fri, 11 Feb 2022, Alex Bennée wrote: > > FYI, a good and promising approach to handle both SCMI and SCPI is the > > series recently submitted by EPAM to mediate SCMI and SCPI requests in > > Xen: https://marc.info/?l=xen-devel&m=163947444032590 > > > > (Another "special" virtio backend is virtio

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-11 Thread Alex Bennée
Stefano Stabellini writes: > On Mon, 7 Feb 2022, Alex Bennée wrote: >> Hi Stefano, >> >> Vincent gave an update on his virtio-scmi work at the last Stratos sync >> call and the discussion moved onto next steps. > > Hi Alex, > > I don't know the specifics of virtio-scmi, but if it is about powe

Re: Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-07 Thread Stefano Stabellini
On Mon, 7 Feb 2022, Alex Bennée wrote: > Hi Stefano, > > Vincent gave an update on his virtio-scmi work at the last Stratos sync > call and the discussion moved onto next steps. Hi Alex, I don't know the specifics of virtio-scmi, but if it is about power, clocks, reset, etc. like the original SC

Metadata and signalling channels for Zephyr virtio-backends on Xen

2022-02-07 Thread Alex Bennée
Hi Stefano, Vincent gave an update on his virtio-scmi work at the last Stratos sync call and the discussion moved onto next steps. Currently the demo setup is intermediated by a double-ended vhost-user daemon running on the devbox acting as a go between a number of QEMU instances representing th