Re: [PATCH RFC 0/2] ignore LBR-related MSRs

[Jan Dakinevich]

On Wed, 6 Dec 2017 14:43:01 +0300
Jan Dakinevich <jan.dakinevich@xxxxxxxxxxxxx> wrote:

> w2k16 essentials fails to boot if underlying hypervisor lacks of
> support for LBR MSRs. To workaround the issue, it suggessted to
> ignore these MSRs (but not all).
> 
> The information, which MSRs are supported for specific platform is
> taken from perf, it is the subject of the first patch. The second
> patch adds ignoring for these MSRs to pmu_intel code of KVM.
> 
> TODO: use MSR load/store areas to make full support of LBR debug.
> 
> Jan Dakinevich (2):
>   perf/x86/intel: make reusable LBR initialization code
>   KVM: x86/vPMU: ignore access to LBR-related MSRs
> 
>  arch/x86/events/core.c            |   8 +-
>  arch/x86/events/intel/core.c      |  59 +++------
>  arch/x86/events/intel/lbr.c       | 272
> +++++++++++++++++++++++++-------------
> arch/x86/events/perf_event.h      |  27 +---
> arch/x86/include/asm/kvm_host.h   |   2 +
> arch/x86/include/asm/perf_event.h |  11 ++
> arch/x86/kvm/pmu_intel.c          |  33 +++++ 7 files changed, 250
> insertions(+), 162 deletions(-)
> 

ping

Please, tell me whether these patches are applicable (as KVM workaround)
or it is assumed they should be reworked following to recommendation by
Andi Kleen?

-- 
Best regards
Jan Dakinevich