x86/hyperv: Check frequency MSRs presence according to the specification

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Hyper-V TLFS specifies two bits which should be checked before accessing
frequency MSRs:

- AccessFrequencyMsrs (BIT(11) in EAX) which indicates if we have access to
  frequency MSRs.
- FrequencyMsrsAvailable (BIT(8) in EDX) which indicates is these MSRs are
  present.
  
Rename and specify these bits accordingly.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Ladi Prosek <lprosek@redhat.com>
Cc: Jork Loeser <jloeser@microsoft.com>
Cc: devel@linuxdriverproject.org
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Link: http://lkml.kernel.org/r/20170622100730.18112-2-vkuznets@redhat.com

...

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Vitaly Kuznetsov 2017-06-22 18:07:29 +08:00 • committed by Thomas Gleixner

parent 48b6bbef9a

commit 2cf0284223

2 changed files with 8 additions and 10 deletions

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15

arch/x86/include/uapi/asm/hyperv.h

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3

arch/x86/kernel/cpu/mshyperv.c

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