On Thu, Oct 01, 2026 at 04:47:54PM +0100, David Woodhouse wrote: > On Thu, 2026-10-01 at 11:17 -0300, Jason Gunthorpe wrote:
> > It would be nice if it could handle MMIO and "cachable MMIO" as well. > > As opposed to just MMIO vs. RAM as implemented in the prototype in > https://git.infradead.org/?p=users/dwmw2/linux.git;a=commitdiff;h=a7ca2d8859036 > ? Sort of, RAM is a little more permanent than "cachable mmio", I prefer the latter because it conveys it is located on a device, is subject to things like reset. Eg "CXL ram" would be cachable mmio. I haven't heard of anything needing a unique PTE for this yet, but who knows down the road. > I think Fred has a cleaner version of that about ready to post as the > next version of my series. Yeah, cleaned up is needed, I want us to resolve this in the dmabuf code cleanly not add more of the hack mess I made for vfio/iommufd.. Jason
