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Name Last Modified Last Commit
lp1875467 2020-06-09 05:33:08 UTC 2020-06-09
x86/hyperv: Allow guests to enable InvariantTSC

Author: Andrea Parri
Author Date: 2019-10-03 15:52:00 UTC

x86/hyperv: Allow guests to enable InvariantTSC

BugLink: http://bugs.launchpad.net/bugs/1875467

If the hardware supports TSC scaling, Hyper-V will set bit 15 of the
HV_PARTITION_PRIVILEGE_MASK in guest VMs with a compatible Hyper-V
configuration version. Bit 15 corresponds to the
AccessTscInvariantControls privilege. If this privilege bit is set,
guests can access the HvSyntheticInvariantTscControl MSR: guests can
set bit 0 of this synthetic MSR to enable the InvariantTSC feature.
After setting the synthetic MSR, CPUID will enumerate support for
InvariantTSC.

Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lkml.kernel.org/r/20191003155200.22022-1-parri.andrea@gmail.com
(backported from commit dce7cd62754b5d4a6e401b8b0769ec94cf971041)
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

master-next 2020-06-05 17:18:57 UTC 2020-06-05
Linux 4.4.224

Author: Greg Kroah-Hartman
Author Date: 2020-05-20 06:11:57 UTC

Linux 4.4.224

BugLink: https://bugs.launchpad.net/bugs/1881356

Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

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