linux-kernel - Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace page tables

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Message-ID: <CALCETrUFddZwQmB9OBzbS-RObg_tU8CA70aEB4n+MG15yYLQRA@mail.gmail.com>
Date:   Thu, 2 Nov 2017 00:32:16 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, Kees Cook <keescook@...gle.com>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 00/23] KAISER: unmap most of the kernel from userspace
 page tables

On Wed, Nov 1, 2017 at 1:33 PM, Andy Lutomirski <luto@...nel.org> wrote:
> On Wed, Nov 1, 2017 at 12:05 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> On Wed, Nov 1, 2017 at 11:46 AM, Dave Hansen
>> <dave.hansen@...ux.intel.com> wrote:
>>>
>>> The vmalloc()'d stacks definitely need the page table walk.
>>
>> Ugh, yes. Nasty.
>>
>> Andy at some point mentioned a per-cpu initial stack trampoline thing
>> for his exception patches, but I'm not sure he actually ever did that.
>>
>> Andy?
>
> I'm going to push it to kernel.org very shortly (like twenty minutes
> maybe).  Then the 0day bot can chew on it.  With the proposed LDT
> rework, we don't need to do any of dynamic mapping stuff, I think.

FWIW, I pushed all but the actual stack switching part.  Something
broke in the rebase and it doesn't boot right now :(