linux-kernel - Re: [V2 PATCH 2/8] KVM: selftests: Add arch specific initialization

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Message-ID: <CAGtprH_BMgeLX14f8J+rmKBtOFs12GY+egGBPW7Un41oDAfcoA@mail.gmail.com>
Date:   Mon, 26 Sep 2022 16:18:45 -0700
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     David Matlack <dmatlack@...gle.com>
Cc:     x86 <x86@...nel.org>, kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>, shuah <shuah@...nel.org>,
        Ben Gardon <bgardon@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Oliver Upton <oupton@...gle.com>, peterx@...hat.com,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [V2 PATCH 2/8] KVM: selftests: Add arch specific initialization

On Wed, Sep 21, 2022 at 1:51 PM David Matlack <dmatlack@...gle.com> wrote:
>
> On Thu, Sep 15, 2022 at 12:04:42AM +0000, 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>
> > 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     |  2 ++
> >  .../selftests/kvm/lib/riscv/processor.c        |  4 ++++
> >  .../selftests/kvm/lib/s390x/processor.c        |  4 ++++
> >  .../selftests/kvm/lib/x86_64/processor.c       |  4 ++++
> >  6 files changed, 28 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 24fde97f6121..98edbbda9f97 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > @@ -834,4 +834,9 @@ 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 selftest logic.
>
> nit: s/before executing selftest logic/before main()/
>

Ack, will fix this in the next series.

> ("selftest logic" is vague)
>
> > + */
> > +void kvm_selftest_arch_init(void);
> > +
> >  #endif /* SELFTEST_KVM_UTIL_BASE_H */
> > diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > index 6f5551368944..2281d6c5d02f 100644
> > --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > @@ -495,15 +495,6 @@ void aarch64_get_supported_page_sizes(uint32_t ipa,
> >       close(kvm_fd);
> >  }
> >
> > -/*
> > - * arm64 doesn't have a true default mode, so start by computing the
> > - * available IPA space and page sizes early.
> > - */
> > -void __attribute__((constructor)) init_guest_modes(void)
> > -{
> > -       guest_modes_append_default();
> > -}
> > -
> >  void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
> >              uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
> >              uint64_t arg6, struct arm_smccc_res *res)
> > @@ -528,3 +519,12 @@ void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
> >                      [arg4] "r"(arg4), [arg5] "r"(arg5), [arg6] "r"(arg6)
> >                    : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7");
> >  }
> > +
> > +/*
> > + * arm64 doesn't have a true default mode, so start by computing the
> > + * available IPA space and page sizes early.
> > + */
> > +void kvm_selftest_arch_init(void)
> > +{
> > +     guest_modes_append_default();
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> > index 3c83838999f5..dafe4471a6c7 100644
> > --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> > @@ -1984,4 +1984,6 @@ void __attribute((constructor)) kvm_selftest_init(void)
> >  {
> >       /* Tell stdout not to buffer its content. */
> >       setbuf(stdout, NULL);
> > +
> > +     kvm_selftest_arch_init();
> >  }
>
> Suggest defining a default no-op implementation of
> kvm_selftest_arch_init() using __weak since most architectures do not
> actually need an implementation.
>

Ack, will update this in the next series.

> > ...
> >