linux-kernel - [PATCH 0/2] x86/vdso: RDPID support and a test

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Date:   Wed, 16 Nov 2016 10:23:26 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        Megha <megha.dey@...el.com>, Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 0/2] x86/vdso: RDPID support and a test

RDPID is a new instruction in unspecified future Intel processors
(sigh) that returns MSR_TSC_AUX.  This will finally let the vDSO
stop using LSL.

Patch 1 is the meat and patch 2 is the test.  Megha has kindly
tested them for me, since I don't own an unspecified Intel processor :)

Andy Lutomirski (2):
  x86/vdso: Use RDPID in preference to LSL when available
  selftests/x86: Add test_vdso to test getcpu

 arch/x86/include/asm/cpufeatures.h      |   1 +
 arch/x86/include/asm/vgtod.h            |   7 +-
 tools/testing/selftests/x86/Makefile    |   2 +-
 tools/testing/selftests/x86/test_vdso.c | 123 ++++++++++++++++++++++++++++++++
 4 files changed, 131 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/x86/test_vdso.c

-- 
2.7.4