linux-kernel - Re: [PATCH v2 05/13] perf: Force architectures to opt-in to guest callbacks

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Date:   Thu, 16 Sep 2021 22:30:45 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>, Guo Ren <guoren@...nel.org>,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Stefano Stabellini <sstabellini@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-csky@...r.kernel.org, linux-riscv@...ts.infradead.org,
        kvm@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Artem Kashkanov <artem.kashkanov@...el.com>,
        Like Xu <like.xu.linux@...il.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: Re: [PATCH v2 05/13] perf: Force architectures to opt-in to guest
 callbacks

On Sat, Aug 28, 2021, Peter Zijlstra wrote:
> On Fri, Aug 27, 2021 at 05:35:50PM -0700, Sean Christopherson wrote:
> > diff --git a/init/Kconfig b/init/Kconfig
> > index 55f9f7738ebb..9ef51ae53977 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -1776,6 +1776,9 @@ config HAVE_PERF_EVENTS
> >  	help
> >  	  See tools/perf/design.txt for details.
> >  
> > +config HAVE_GUEST_PERF_EVENTS
> > +	bool
> 	depends on HAVE_KVM
> 
> ?

Ah, nice!  We can go even further to:

	depends on HAVE_PERF_EVENTS && HAVE_KVM

though I'm pretty sure all architectures that select HAVE_KVM also select
HAVE_PERF_EVENTS.

Huh.  arm64 doesn't select HAVE_KVM even though it selects almost literally every
other HAVE_KVM_* config.  arm64 has some other weirdness with CONFIG_KVM, I'll add
a patch or two to fix that stuff and amend this patch as above.

Thanks again!