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On x86, KVM selftests use memslot 0 for all the default regions used by the test infrastructure. This is an implementation detail. nested_map_memslot() is currently used to map the default regions by explicitly passing slot 0, which leaks the library implementation into the caller. Rename the function to a very verbose nested_identity_map_default_memslots() to reflect what it actually does. Add an assertion that only memslot 0 is being used so that the implementation does not change from under us. No functional change intended. Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev> Link: https://patch.msgid.link/20251230230150.4150236-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>