Re: [Xen-devel] [PATCH] x86/vpmu_intel: Handle SMT consistently for programmable and fixed counters

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Mohit Gambhir [mailto:mohit.gambhir@xxxxxxxxxx]
> Sent: Friday, March 31, 2017 10:46 PM
> 
> This patch masks .AnyThread bits in IA32_FIXED_CTR_CTRL MSR for all
> versions of Intel Arhcitectural Performance Monitoring. Note that
> .AnyThread bit (21) is already masked in IA32_PERFEVTSELx MSRs since
> hyperthreading is not exposed to guests and Intel SDM discourages the use
> of
> .AnyThread bit in virtualized environments (per section 18.2.3.1
> AnyThread Counting and Software Evolution)
> 
> Signed-off-by: Mohit Gambhir <mohit.gambhir@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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