This content has not been validated; it was AI-generated following the x86-64 ISA Documentation generation process to maintain high quality. However, as no human has verified this data, errors may exist. If the accuracy of this data is critical, please consult the Intel SDM. The model used to generate this is gemma4:31b

PCONFIG

Configures processor-specific features by writing a value to a model-specific register.

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

DO NOT support LOCK

PCONFIG is only available in 64-bit mode. Execution of PCONFIG in compatibility mode or 32-bit mode SHALL result in an invalid opcode exception.

To avoid unexpected behavior, the instruction MUST be executed with the appropriate privilege level; attempting to execute PCONFIG at CPL 3 SHALL result in a general protection fault (#GP). Additionally, users MUST ensure the processor supports the PCONFIG instruction by checking CPUID, as attempting to use it on unsupported hardware will result in an invalid opcode exception.