linux-kernel - Re: [PATCH kvm/queue v2 2/3] perf: x86/core: Add interface to query perfmon_event

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Message-ID: <CALMp9eRX3nTLs4gcy3wnSUSOPO7xzDpMvDLGauue9o0PwBAmbA@mail.gmail.com>
Date:   Sat, 12 Feb 2022 15:32:34 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Like Xu <like.xu.linux@...il.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Like Xu <likexu@...cent.com>,
        Stephane Eranian <eranian@...gle.com>,
        David Dunn <daviddunn@...gle.com>
Subject: Re: [PATCH kvm/queue v2 2/3] perf: x86/core: Add interface to query
 perfmon_event_map[] directly

On Wed, Feb 9, 2022 at 10:57 AM Dave Hansen <dave.hansen@...el.com> wrote:

> Does SGX cause problem for these people?  It can create some of the same
> collection gaps:
>
>         performance monitoring activities are suppressed when entering
>         an opt-out (of performance monitoring) enclave.

There's our precedent!