On 01/05/2018 10:53 PM, Hanjun Guo wrote:
>>  +	/*
>>  +	 * PTI poisons low addresses in the kernel page tables in the
>>  +	 * name of making them unusable for userspace.  To execute
>>  +	 * code at such a low address, the poison must be cleared.
>>  +	 */
>>  +	pgd->pgd &= ~_PAGE_NX;
>>
>> We will have a try in a minute, and report back later.
> And it worksi 1/4 ?we can boot/reboot the system successfully, thank
> you all the quick response and debug!

I think I'll just submit the attached patch if there are no objections
(and if it works, of course!).

I just stuck the NX clearing at the bottom.