From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org
Cc: Borislav Petkov <bp@alien8.de>,
linux-kernel@vger.kernel.org, Megha <megha.dey@intel.com>,
Andy Lutomirski <luto@kernel.org>
Subject: [PATCH 0/2] x86/vdso: RDPID support and a test
Date: Wed, 16 Nov 2016 10:23:26 -0800 [thread overview]
Message-ID: <cover.1479320367.git.luto@kernel.org> (raw)
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
next reply other threads:[~2016-11-16 18:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-16 18:23 Andy Lutomirski [this message]
2016-11-16 18:23 ` [PATCH 1/2] x86/vdso: Use RDPID in preference to LSL when available Andy Lutomirski
2016-11-17 7:49 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-11-16 18:23 ` [PATCH 2/2] selftests/x86: Add test_vdso to test getcpu Andy Lutomirski
2016-11-17 7:50 ` [tip:x86/asm] selftests/x86: Add test_vdso to test getcpu() tip-bot for Andy Lutomirski
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