linux-kernel - Re: [PATCH v6 00/44] KVM: x86: Add support for mediated vPMUs

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Message-ID: <20251208153738.GC3707837@noisy.programming.kicks-ass.net>
Date: Mon, 8 Dec 2025 16:37:38 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oupton@...nel.org>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Bibo Mao <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>,
	Anup Patel <anup@...infault.org>, Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Xin Li <xin@...or.com>,
	"H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	kvm@...r.kernel.org, loongarch@...ts.linux.dev,
	kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Mingwei Zhang <mizhang@...gle.com>,
	Xudong Hao <xudong.hao@...el.com>,
	Sandipan Das <sandipan.das@....com>,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>,
	Xiong Zhang <xiong.y.zhang@...ux.intel.com>,
	Manali Shukla <manali.shukla@....com>,
	Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v6 00/44] KVM: x86: Add support for mediated vPMUs

On Fri, Dec 05, 2025 at 04:16:36PM -0800, Sean Christopherson wrote:
> My hope/plan is that the perf changes will go through the tip tree with a
> stable tag/branch, and the KVM changes will go the kvm-x86 tree.

> Kan Liang (7):
>   perf: Skip pmu_ctx based on event_type
>   perf: Add generic exclude_guest support
>   perf: Add APIs to create/release mediated guest vPMUs
>   perf: Clean up perf ctx time
>   perf: Add a EVENT_GUEST flag
>   perf: Add APIs to load/put guest mediated PMU context
>   perf/x86/intel: Support PERF_PMU_CAP_MEDIATED_VPMU
> 
> Mingwei Zhang (3):
>   perf/x86/core: Plumb mediated PMU capability from x86_pmu to
>     x86_pmu_cap
>
> Sandipan Das (3):
>   perf/x86/core: Do not set bit width for unavailable counters
>   perf/x86/amd: Support PERF_PMU_CAP_MEDIATED_VPMU for AMD host
> 
> Sean Christopherson (19):
>   perf: Move security_perf_event_free() call to __free_event()
>   perf/x86/core: Register a new vector for handling mediated guest PMIs
>   perf/x86/core: Add APIs to switch to/from mediated PMI vector (for
>     KVM)

That all looks to be in decent shape; lets go get this merged. There is
the nit on patch 4 and I think a number of the exports want to be
EXPORT_SYMBOL_FOR_KVM() instead, but we can do that on top.

I'll queue these patches after rc1.