linux-kernel - [PATCH 0/2] Avoid using TSC clocksource on AMD APUs affected by erratum 778

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Date:	Thu, 31 Jul 2014 09:47:11 +0000
From:	Igor Mammedov <imammedo@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, pbonzini@...hat.com, kvm@...r.kernel.org,
	mtosatti@...hat.com
Subject: [PATCH 0/2] Avoid using TSC clocksource on AMD APUs affected by erratum 778

Fixes pvclock backwards jumps caused by TSC drifting despite
host believing that TSC is invariant/synchronized.

TSC drift maybe caused by erratum 778 described in
"Revision Guide for AMD Family 15h Models 10h-1Fh Processors,
 Publication # 48931, Issue Date: May 2013, Revision: 3.10"


Igor Mammedov (2):
  x86: AMD: mark TSC unstable on APU family 15h models 10h-1fh
  x86: kvm: do not advertise stable clocksource if CPU has TSC drift BUG

 arch/x86/include/asm/cpufeature.h | 1 +
 arch/x86/kernel/cpu/amd.c         | 9 +++++++++
 arch/x86/kvm/cpuid.c              | 3 ++-
 3 files changed, 12 insertions(+), 1 deletion(-)

-- 
1.8.3.1

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