linux-kernel - [PATCH 0/2] hyper-v: avoid tsc calibration

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Message-Id: <20170619022338.7704-1-vkuznets@redhat.com>
Date:   Mon, 19 Jun 2017 10:23:36 +0800
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     devel@...uxdriverproject.org
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Jork Loeser <jloeser@...rosoft.com>,
        Ladi Prosek <lprosek@...hat.com>
Subject: [PATCH 0/2] hyper-v: avoid tsc calibration

TSC calibration on virtual machines is always error prone. It was found
that in nested environments Gen2 instances may get stuck on boot. As
Hyper-V hosts provide us with all the required information we can easily
avoid calibration. This is already done for other hypervisors (KVM,
Vmware).

Vitaly Kuznetsov (2):
  hyper-v: check frequency MSRs presence according to the specification
  hyper-v: read TSC frequency from a synthetic MSR

 arch/x86/include/uapi/asm/hyperv.h | 15 ++++++---------
 arch/x86/kernel/cpu/mshyperv.c     | 18 +++++++++++++++++-
 2 files changed, 23 insertions(+), 10 deletions(-)

-- 
2.9.4