From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: devel@linuxdriverproject.org
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Jork Loeser <jloeser@microsoft.com>,
Ladi Prosek <lprosek@redhat.com>
Subject: [PATCH 0/2] hyper-v: avoid tsc calibration
Date: Mon, 19 Jun 2017 10:23:36 +0800 [thread overview]
Message-ID: <20170619022338.7704-1-vkuznets@redhat.com> (raw)
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
next reply other threads:[~2017-06-19 2:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-19 2:23 Vitaly Kuznetsov [this message]
2017-06-19 2:23 ` [PATCH 1/2] hyper-v: check frequency MSRs presence according to the specification Vitaly Kuznetsov
2017-06-20 19:20 ` Thomas Gleixner
2017-06-19 2:23 ` [PATCH 2/2] hyper-v: read TSC frequency from a synthetic MSR Vitaly Kuznetsov
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