Re: [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled

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Subject: Re: [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Mon, 17 May 2021 21:19:00 +0000
Cc: "Xu, Like" <like.xu@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, weijiang.yang@xxxxxxxxx, Kan Liang <kan.liang@xxxxxxxxxxxxxxx>, ak@xxxxxxxxxxxxxxx, wei.w.wang@xxxxxxxxx, Stephane Eranian <eranian@xxxxxxxxxx>, liuxiangdong5@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Yao Yuan <yuan.yao@xxxxxxxxx>, Like Xu <like.xu@xxxxxxxxxxxxxxx>
In-reply-to: <CAA0tLErHZwyk_01jzy3u4Y+iGEM05zt-+inrhFXy4a5iw0X8-A@mail.gmail.com>
References: <20210511024214.280733-1-like.xu@linux.intel.com> <20210511024214.280733-5-like.xu@linux.intel.com> <CAA0tLErUFPnZ=SL82bLe8Ddf5rFu2Pdv5xE0aq4A91mzn9=ABA@mail.gmail.com> <ead61a83-1534-a8a6-13ee-646898a6d1a9@intel.com> <YJvx4tr2iXo4bQ/d@google.com> <5ef2215b-1c43-fc8a-42ef-46c22e093f40@intel.com> <CAA0tLErHZwyk_01jzy3u4Y+iGEM05zt-+inrhFXy4a5iw0X8-A@mail.gmail.com>

On Mon, May 17, 2021, Venkatesh Srinivas wrote:
> Should this bit be conditional on the host having it set?

No need, KVM advertises the architectural PMU to userspace iff hardware itself
has an architecture PMU.  Userspace is free to lie to its guests so long as doing
so doesn't put KVM at risk.

References:
- [PATCH v6 00/16] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS
  - From: Like Xu
- [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
  - From: Like Xu
- Re: [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
  - From: Venkatesh Srinivas
- Re: [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
  - From: Xu, Like
- Re: [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
  - From: Sean Christopherson
- Re: [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
  - From: Xu, Like
- Re: [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
  - From: Venkatesh Srinivas

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