In the context of the conditions for ISA virtualizability, consider an hypotetical ISA including the following exemplificative instructions as described:
- Inst_A : this instruction can only be executed in system mode, otherwise traps.
- Inst_B : this instruction retrieves the global wide state of hardware resources.
- Inst_C : this instruction allows to take control of the CPU scheduling timer.
- Inst_D : this instruction performs arithmetic multiplication of two registers.

Considering only what you can infer from the presented information about instructions Inst_A, Inst_B, Inst_C, Inst_D, identify which of the following sentences is/are corrrect.

(select all the correct options).

Question

In the context of the conditions for ISA virtualizability, consider an hypotetical ISA including the following exemplificative instructions as described: 
 - Inst_A : this instruction can only be executed in system mode, otherwise traps. 
 - Inst_B : this instruction retrieves the global wide state of hardware resources. 
 - Inst_C : this instruction allows to take control of the CPU scheduling timer. 
 - Inst_D : this instruction performs arithmetic multiplication of two registers.

Considering only what you can infer from the presented information about instructions Inst_A, Inst_B, Inst_C, Inst_D, identify which of the following sentences is/are corrrect.

(select all the correct options).

Answer

Inst_B is a behaviour-sensitive instruction and therefore critical instruction.

Answer

Inst_A and Inst_D can be executed in system-mode.

Answer

Inst_A does not prevent ISA_X from being well-behaved.

Answer

Inst_D prevents ISA_X from being efficiently virtualizable.

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In the context of the conditions for ISA virtualizability, consider an hypotetic...

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