linux-kernel - Re: [RFC PATCH 23/41] KVM: x86/pmu: Implement the save/restore of PMU state for Intel CPU

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Message-ID: <e1aae0a8-fcd8-42ea-81b2-0f95c9d7cc2b@linux.intel.com>
Date: Wed, 1 May 2024 14:00:21 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Mingwei Zhang <mizhang@...gle.com>,
 Sean Christopherson <seanjc@...gle.com>
Cc: Dapeng Mi <dapeng1.mi@...ux.intel.com>, maobibo <maobibo@...ngson.cn>,
 Xiong Zhang <xiong.y.zhang@...ux.intel.com>, pbonzini@...hat.com,
 peterz@...radead.org, kan.liang@...el.com, zhenyuw@...ux.intel.com,
 jmattson@...gle.com, kvm@...r.kernel.org, linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org, zhiyuan.lv@...el.com, eranian@...gle.com,
 irogers@...gle.com, samantha.alt@...el.com, like.xu.linux@...il.com,
 chao.gao@...el.com
Subject: Re: [RFC PATCH 23/41] KVM: x86/pmu: Implement the save/restore of PMU
 state for Intel CPU



On 2024-05-01 1:43 p.m., Mingwei Zhang wrote:
> One of the things on top of the mind is that: there seems to be no way
> for the perf subsystem to express this: "no, your host-level profiling
> is not interested in profiling the KVM_RUN loop when our guest vPMU is
> actively running".

exclude_hv? Although it seems the option is not well supported on X86
for now.

Thanks,
Kan