From: K. Y. Srinivasan <kys@microsoft.com>
Date: Wed, 5 Aug 2015 07:52:42 +0000 (-0700)
Subject: Drivers: hv: vmbus: Implement a clocksource based on the TSC page
X-Git-Tag: omap-for-v4.3/fixes-merge-window~46^2~53
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca9357bd26c2f8e7b909321eedd651f52cc30d04;p=pandora-kernel.git

Drivers: hv: vmbus: Implement a clocksource based on the TSC page

The current Hyper-V clock source is based on the per-partition reference counter
and this counter is being accessed via s synthetic MSR - HV_X64_MSR_TIME_REF_COUNT.
Hyper-V has a more efficient way of computing the per-partition reference
counter value that does not involve reading a synthetic MSR. We implement
a time source based on this mechanism.

Tested-by: Vivek Yadav <vyadav@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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