linux-kernel - [RFC][PATCH 00/10] Use global pages with PTI

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Message-Id: <20180222203651.B776810C@viggo.jf.intel.com>
Date:   Thu, 22 Feb 2018 12:36:51 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>, 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: [RFC][PATCH 00/10] Use global pages with PTI

The later verions of the KAISER pathces (pre-PTI) allowed the user/kernel
shared areas to be GLOBAL.  The thought was that this would reduce the
TLB overhead of keeping two copies of these mappings.

During the switch over to PTI, we seem to have lost our ability to have
GLOBAL mappings.  This adds them back.

Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Kees Cook <keescook@...gle.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: x86@...nel.org
Cc: Nadav Amit <namit@...are.com>