On Fri, Jul 19, 2024 at 08:41:04AM +0200, Christian Gmeiner wrote: > This wonderful interface is used in recent products from them too. > Adding support for it > in an upstream-able way could be still a benefit, as these products > are used in different > industrial environments running on Linux. Just seconding this. The hardware we have here (conga-TCA7) was released in 2021. As far as I know, congatec have been using this interface for a while and provided a pretty bad out-of-tree driver for it that needed a proprietary library in userspace to talk to devices instead of actually registering with the kernel facilities for i2c, watchdog, backlight, etc. I think it's valuable functionality to support, but it'll need to happen safely. Maybe some of the stuff the driver does right now could be moved into vmalloc? In other words, we could provide a different function that allocates an executable page, copies memory into it, then marks it read-only. Would that do better to alleviate concerns? Not sure what the restrictions on x86 are, but we could also start with a writable page, then mark it executable when we un-mark it writable. I think this is good discussion, thanks for sharing your thoughts everybody.
