Hi, could I get help from you? about linux-kvm-arm-instrumentation

[jaidTw]

Hi, I'm not sure my implementation were correct, but welcome to discuss with me :)

[jaidTw]

According to the manual, I think there's only data and instructions abort are related to IO and mem fault, and both of them are using the same handler kvm_handle_guest_abort(), and the comment of the handler tells that there are two type of faults, which is IO memory fault and main memory fault,.
I guess the if section which calls the io_mem_abort() is for dealing with MMIO fault, and the statements below calls the user_mem_abort is for mem fault

[poweihuang17]

Hi, JaidTw. Thank you. We are studying what you said. But we found that for mem, the trap count is pretty small.

[jaidTw]

Hi, You can compare your trap count to the screenshot provided by TA in the HW description.
The mem count in our experiments is ~ 23K, which is almost same as in the screenshot.

[poweihuang17]

Yes, I know. But when you execute mem, did you get any additional memory trap?

[jaidTw]

There were some, but stop growing soon, we guess that only some memory falut will trap to EL2, you can refer to the MMU faults and Virtual Memory section in the manual.

[poweihuang17]

OK. Thank you!