mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-01 14:44:12 +00:00
Code Issues Releases Wiki Activity

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

Browse source 
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
This commit is contained in:
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
Show stats Download patch file Download diff file Expand all files Collapse all files

15
arch/x86/include/uapi/asm/hyperv.h
View file

@ -34,16 +34,10 @@
#define HV_X64_MSR_REFERENCE_TSC 0x40000021
/*
* There is a single feature flag that signifies the presence of the MSR
* that can be used to retrieve both the local APIC Timer frequency as
* well as the TSC frequency.
* There is a single feature flag that signifies if the partition has access
* to MSRs with local APIC and TSC frequencies.
*/
/* Local APIC timer frequency MSR (HV_X64_MSR_APIC_FREQUENCY) is available */
#define HV_X64_MSR_APIC_FREQUENCY_AVAILABLE (1 << 11)
/* TSC frequency MSR (HV_X64_MSR_TSC_FREQUENCY) is available */
#define HV_X64_MSR_TSC_FREQUENCY_AVAILABLE (1 << 11)
#define HV_X64_ACCESS_FREQUENCY_MSRS (1 << 11)
/*
* Basic SynIC MSRs (HV_X64_MSR_SCONTROL through HV_X64_MSR_EOM
@ -73,6 +67,9 @@
*/
#define HV_X64_MSR_STAT_PAGES_AVAILABLE (1 << 8)
/* Frequency MSRs available */
#define HV_FEATURE_FREQUENCY_MSRS_AVAILABLE (1 << 8)
/* Crash MSR available */
#define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE (1 << 10)

3
arch/x86/kernel/cpu/mshyperv.c
View file

@ -194,7 +194,8 @@ static void __init ms_hyperv_init_platform(void)
}
#ifdef CONFIG_X86_LOCAL_APIC
if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) {
if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS &&
ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) {
/*
* Get the APIC frequency.
*/