linux-kernel - Re: [V4 PATCH 2/3] KVM: selftests: Add arch specific initialization

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Message-ID: <CAGtprH9H8OU0QU_3G0hjVp1P5OHLiTeVWEkUtynZjCx1Z8pdLQ@mail.gmail.com>
Date:   Thu, 17 Nov 2022 10:24:23 -0800
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, pbonzini@...hat.com,
        shuah@...nel.org, bgardon@...gle.com, oupton@...gle.com,
        peterx@...hat.com, vkuznets@...hat.com, dmatlack@...gle.com,
        pgonda@...gle.com, andrew.jones@...ux.dev
Subject: Re: [V4 PATCH 2/3] KVM: selftests: Add arch specific initialization

On Wed, Nov 16, 2022 at 9:46 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> On Tue, Nov 15, 2022, Vishal Annapurve wrote:
> > Introduce arch specific API: kvm_selftest_arch_init to allow each arch to
> > handle initialization before running any selftest logic.
> >
> > Suggested-by: Sean Christopherson <seanjc@...gle.com>
> > Reviewed-by: Andrew Jones <andrew.jones@...ux.dev>
> > Reviewed-by: Peter Gonda <pgonda@...gle.com>
> > Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
> > ---
> >  .../selftests/kvm/include/kvm_util_base.h      |  5 +++++
> >  .../selftests/kvm/lib/aarch64/processor.c      | 18 +++++++++---------
> >  tools/testing/selftests/kvm/lib/kvm_util.c     |  6 ++++++
> >  3 files changed, 20 insertions(+), 9 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > index e42a09cd24a0..eec0e4898efe 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > @@ -838,4 +838,9 @@ static inline int __vm_disable_nx_huge_pages(struct kvm_vm *vm)
> >       return __vm_enable_cap(vm, KVM_CAP_VM_DISABLE_NX_HUGE_PAGES, 0);
> >  }
> >
> > +/*
> > + * API to execute architecture specific setup before executing main().
> > + */
>
> I find the "API" blurb to be somewhat confusing.  When I think of APIs, I think
> of functions that are provided by a library that are called by users of the
> library.
>
> An example might also help readers understand what types of setup can/should be
> done with this hook.
>
> Maybe something like this?
>
> /*
>  * Arch hook that is invoked via a constructor, i.e. before exeucting main(),
>  * to allow for arch-specific setup that is common to all tests, e.g. computing
>  * the default guest "mode".
>  */

Ack, that looks better.