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LOADIWKEY

Loads a 64-bit value from a memory location into a specified register, typically used in the context of loading instrumentation or isolation keys.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction is ONLY available when the processor is operating in 64-bit mode. It SHALL NOT be used in compatibility mode.

The memory operand MUST be naturally aligned to an 8-byte boundary; otherwise, a General Protection exception (#GP) MAY occur depending on the processor's alignment checking configuration. Ensure the source address is valid and accessible to avoid a Page Fault (#PF).