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Subject: [RFC][PATCH 00/10] Use global pages with PTI
To:     linux-kernel@vger.kernel.org
Cc:     Dave Hansen <dave.hansen@linux.intel.com>, aarcange@redhat.com,
        luto@kernel.org, torvalds@linux-foundation.org,
        keescook@google.com, hughd@google.com, jgross@suse.com,
        x86@kernel.org, namit@vmware.com
From:   Dave Hansen <dave.hansen@linux.intel.com>
Date:   Thu, 22 Feb 2018 12:36:51 -0800
Message-Id: <20180222203651.B776810C@viggo.jf.intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Kees Cook <keescook@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: x86@kernel.org
Cc: Nadav Amit <namit@vmware.com>