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

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Message-ID: <CA+55aFzQ3cFin78_BcU8d1u1-kJugQh9c0PRJuDjXPf3Z75+Mw@mail.gmail.com>
Date:   Wed, 1 Nov 2017 12:05:44 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        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 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?

              Linus