Instruction not emulated properly on guests

The following instruction does not work properly on guests 

```
mov $1, %rsi
mov $0x8086, %eax
cmpl (PCI_VID_ADDR), %eax
je 1f
mov $0, %rsi
1:
```

After execution, %rsi equals 0, it should be 1 as `je 1f` is true and jumps to `1:`