linux-kernel - [PATCH v2 0/3] x86/mm: INVPCID support

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Message-Id: <cover.1453746505.git.luto@kernel.org>
Date:	Mon, 25 Jan 2016 10:37:41 -0800
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Borislav Petkov <bp@...en8.de>, Brian Gerst <brgerst@...il.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH v2 0/3] x86/mm: INVPCID support

Ingo, before applying this, please apply these two KASAN fixes:

http://lkml.kernel.org/g/1452516679-32040-2-git-send-email-aryabinin@virtuozzo.com
http://lkml.kernel.org/g/1452516679-32040-3-git-send-email-aryabinin@virtuozzo.com

Without those fixes, this series will trigger a KASAN bug.

This is a straightforward speedup on Ivy Bridge and newer, IIRC.
(I tested on Skylake.  INVPCID is not available on Sandy Bridge.
I don't have Ivy Bridge, Haswell or Broadwell to test on, so I
could be wrong as to when the feature was introduced.)

I think we should consider these patches separately from the rest
of the PCID stuff -- they barely interact, and this part is much
simpler and is useful on its own.

This is exactly identical to patches 2-4 of the PCID RFC series.

Andy Lutomirski (3):
  x86/mm: Add INVPCID helpers
  x86/mm: Add a noinvpcid option to turn off INVPCID
  x86/mm: If INVPCID is available, use it to flush global mappings

 Documentation/kernel-parameters.txt |  2 ++
 arch/x86/include/asm/tlbflush.h     | 50 +++++++++++++++++++++++++++++++++++++
 arch/x86/kernel/cpu/common.c        | 16 ++++++++++++
 3 files changed, 68 insertions(+)

-- 
2.5.0