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I am > > not interested in muddying through isolation for the general memory > > expander use case without engagement from deployment use cases. > > I can't remember any internal discussions about using isolation for only accelerators so > I'll need to check and see if that's something we're interested in. > > As for the memory expander case: would something like the N_PRIVATE > node set Gregory sent out [1] be enough to change your mind on this? > It doesn't provide the same guarantees as a type 2 set would, but it > does limit the usage of CXL memory to be more like type 2 memory. It is not clear to me that can provide the guarantees needed to make isolation useful. It is still fundamentally a core-mm services capability. That effort is not well served if it needs to handle the constraint of: "consider that at any moment this entire node starts throwing poison, the system needs to stay alive through that event". > Regardless, I (really) won't bring it up again until we have someone who wants to deploy this thing. I am always open to reconsidering positions in the face of new evidence. The workable aspect of a direct-attached-accelerator first approach is that the accelerator driver has direct ownership of the error model. Compare that to the core-mm which only considers a page failure model, not a node failure model. The direct-attached-accelerator constraint is enough to get some core enabling in the pipeline. Expansions from that baseline can be evaluated later.