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HMM is, I believe, a Linux feature.
AMD added HMM support in ROCm 5.0 according to this: https://github.com/RadeonOpenCompute/ROCm/blob/develop/CHANG...
HMM is a Linux thing, not an nVidia thing. https://www.kernel.org/doc/html/v5.0/vm/hmm.html
AMD has much the same variations as nvidia here, some details at https://github.com/amd/amd-lab-notes/blob/release/mi200-memo.... The single memory systems are called APUs. The internet thinks the MI300 (in El Capitan) is one of those. The games consoles and mobile chips are too.
I'm not sure what the limits are in terms of arbitrary heterogenous execution if you want to push the boundaries, e.g. can you JIT amdgpu code into memory you got from mmap and have one of the GPU execution units branch to it? I don't see why not, but haven't tried it.
In principle I suppose a page should be able to migrate between nvidia and amdgpu hardware on a machine containing GPUS from both vendors, though that isn't likely to be a well tested path.