linux-kernel - Re: [PATCH 00/11] [v5] Use global pages with PTI

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Date:   Mon, 9 Apr 2018 12:50:20 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Tom Lendacky <thomas.lendacky@....com>,
        linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, aarcange@...hat.com, luto@...nel.org,
        torvalds@...ux-foundation.org, keescook@...gle.com,
        hughd@...gle.com, jgross@...e.com, x86@...nel.org, namit@...are.com
Subject: Re: [PATCH 00/11] [v5] Use global pages with PTI

On 04/09/2018 11:59 AM, Tom Lendacky wrote:
> On 4/9/2018 1:17 PM, Dave Hansen wrote:
>> On 04/09/2018 11:04 AM, Tom Lendacky wrote:
>>> On 4/6/2018 3:55 PM, Dave Hansen wrote:
>>>> Changes from v4
>>>>  * Fix compile error reported by Tom Lendacky
>>> This built with CONFIG_RANDOMIZE_BASE=y, but failed to boot successfully.
>>> I think you're missing the initialization of __default_kernel_pte_mask in
>>> kaslr.c.
>>
>> This should be simple to fix (just add a -1 instead of 0), but let me
>> double-check and actually boot the fix.
> 
> Yup, added an "= ~0" and everything is good.

I'm testing at this commit in the tip tree:

0564258... x86/pti: Leave kernel text global for !PCID

It seems to boot OK with RANDOMIZE_BASE=y for both PCID and non-PCID
configuration.  Could you send along your .config so I can try to reproduce?