Think flow

1. I modify the conditional branch of load_tlb from JNE to JE, and related code.
1. Running in original QEMU can boot ARM-Linux, so far so good.
2. I change the location of SAVE_DIRTY_STATES, call it QEMU_TK;
3. QEMU_TK die after first page fault happen
1. Question: what's the difference between QEMU and QEMU_TK ?
2. difference means the state of 
4. OK, we need to restore states back