linux-kernel - Re: [PATCH v5 0/3] Support Perf Extension on AMD KVM guests

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Message-ID: <7d5fbe31-e24c-8ec6-631e-6909bcef3430@amd.com>
Date:   Fri, 16 Feb 2018 13:26:21 -0600
From:   "Natarajan, Janakarajan" <Janakarajan.Natarajan@....com>
To:     kvm@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Len Brown <len.brown@...el.com>, Borislav Petkov <bp@...e.de>,
        Kyle Huey <me@...ehuey.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH v5 0/3] Support Perf Extension on AMD KVM guests

On 2/5/2018 1:24 PM, Janakarajan Natarajan wrote:
> This patchset adds support for Perf Extension on AMD KVM guests.
>
> When perf runs on a guest with family = 15h || 17h, the MSRs that are
> accessed, when the Perf Extension flag is made available, differ from
> the existing K7 MSRs. The accesses are to the AMD Core Performance
> Extension counters which provide 2 extra counters and new MSRs for both
> the event select and counter registers.
>
> Since the new event select and counter MSRs are interleaved and K7 MSRs
> are contiguous, the logic to map them to the gp_counters[] is changed.
>
> This patchset has been tested with Family 17h and Opteron G1 guests.
>
> v1->v2:
> * Rearranged MSR #defines based on Boris's suggestion.
>
> v2->v3:
> * Changed the logic of mapping MSR to gp_counters[] index based on
>    Boris's feedback.
> * Removed use of family checks based on Radim's feedback.
> * Removed KVM bugfix patch since it is already applied.
>
> v3->v4:
> * Rebased to latest KVM tree.
>
> v4->v5:
> * Removed conditional check when exposing Perf Extension flag to
>    guests based on Radim's feedback.
>
> Janakarajan Natarajan (3):
>    x86/msr: Add AMD Core Perf Extension MSRs
>    x86/kvm: Add support for AMD Core Perf Extension in guest
>    x86/kvm: Expose AMD Core Perf Extension flag to guests

Are there any concerns regarding this patchset?

Thanks.

>
>   arch/x86/include/asm/msr-index.h |  14 ++++
>   arch/x86/kvm/cpuid.c             |   2 +-
>   arch/x86/kvm/pmu_amd.c           | 140 +++++++++++++++++++++++++++++++++++----
>   arch/x86/kvm/x86.c               |   1 +
>   4 files changed, 142 insertions(+), 15 deletions(-)
>