linux-kernel - Re: [PATCH 3/5] tools headers x86: Copy cpuid helpers from the kernel

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Message-ID: <YIIQGu82bdqjpktA@google.com>
Date:   Thu, 22 Apr 2021 17:08:58 -0700
From:   Ricardo Koller <ricarkol@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH 3/5] tools headers x86: Copy cpuid helpers from the kernel

On Thu, Apr 22, 2021 at 08:59:50AM +0200, Paolo Bonzini wrote:
> On 22/04/21 02:56, Ricardo Koller wrote:
> > Copy arch/x86/include/asm/acpufeature.h and arch/x86/kvm/reverse_cpuid.h
> > from the kernel so that KVM selftests can use them in the next commits.
> > Also update the tools copy of arch/x86/include/asm/acpufeatures.h.
> 
> Typo.
> 
> > These should be kept in sync, ideally with the help of some script like
> > check-headers.sh used by tools/perf/.
> 
> Please provide such a script.
> 
> Also, without an automated way to keep them in sync I think it's better to
> copy all of them to tools/testing/selftests/kvm

Will move them to the kvm subdir. The only issue is cpufeatures.h as
that would create a third copy of it: there is one already at
tools/arch/x86/include/asm/cpufeatures.h. Note that we can't move
cpufeatures.h from tools/arch/x86/include/asm to
tools/testing/selftests/kvm as it's already included by others like
tools/perf.

> so that we can be sure that
> a maintainer (me) runs the script and keeps them up to date. I am fairly
> sure that the x86 maintainers don't want to have anything to do with all of
> this business!
> 
> Paolo
>

Thanks for the review!

I'll try this approach for the next version: copy the new headers to
tools/testing/selftests/kvm (except cpufeatures.h), and add the script.