On Fri, Feb 06, 2026 at 11:03:05AM +0000, Jonathan Cameron wrote: > On Thu, 5 Feb 2026 18:10:55 -0500 > Gregory Price <[email protected]> wrote: > > I disagree. There is nothing in the specification to say it should do that and > we have very intentionally not done so in QEMU - this is far from the first > time this has come up!. We won't be doing so any time soon unless someone > convinces me with clear spec references and tight reasoning for why it is the > right thing to do. >
Interestingly I've had this exact conversation - in reverse - with other platform folks, who think CFMWS w/o SRAT is broken. It was a zealous enough opinion that I may have over-indexed on it (plus i've read the numa mapping code and making this more dynamic seems difficult). > This configuration reflects the pre hotplug / early CXL deployment > situation. Now we have proper support in Linux we have moved beyond that. > We do need to solve the dynamic NUMA node cases though and I'm hoping your > current work will make that a bit easier. If we want flexibility to ship HPAs around to different nodes at runtime, that might cause issues. The page-to-nid / pa-to-nid mapping code is somewhat expected to be immutable after __init, so there could be nasty assumptions sprinkled all over the kernel. That will take some time. --- Andrew if Jonathan is good with it then with changelog updates this can go in, otherwise I don't think this warrants a backport or anything. ~Gregory
