linux-kernel - Re: [V1 PATCH 2/5] selftests: kvm: Introduce kvm_arch

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Message-ID: <CAGtprH9Kaemwupgoo_kgM-Ci2cnN2kpXa+ZwEymSnYNFhS9Fsg@mail.gmail.com>
Date:   Tue, 6 Sep 2022 15:46:20 -0700
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     Andrew Jones <andrew.jones@...ux.dev>
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>, oupton@...gle.com,
        peterx@...hat.com, Vitaly Kuznetsov <vkuznets@...hat.com>,
        drjones@...hat.com, David Matlack <dmatlack@...gle.com>
Subject: Re: [V1 PATCH 2/5] selftests: kvm: Introduce kvm_arch_main and helpers

On Mon, Sep 5, 2022 at 12:46 AM Andrew Jones <andrew.jones@...ux.dev> wrote:
>
> On Sat, Sep 03, 2022 at 01:28:46AM +0000, Vishal Annapurve wrote:
> > Introduce following APIs:
> > 1) kvm_arch_main : to be called at the startup of each test.
>
> With this, AArch64 can move the content of its constructor,
> init_guest_modes(), into kvm_arch_main(). Or, instead of the
>
>  main()
>  {
>     /* common main stuff */
>     kvm_arch_main();
>     __main();
>  }
>
> approach we could have each arch provide a constructor
>
>  arch_init()
>  {
>     common_pre_main_stuff();
>     /* arch specific pre-main stuff */
>  }
>
> I personally prefer the latter.
>

I agree with your suggestion of using constructors here. This will
help avoid changes in all the selftests.
Maybe I can add a common constructor that can invoke arch specific
init. I will add this change in the next series.

Thanks,
Vishal

> Thanks,
> drew
>
> > 2) kvm_arch_post_vm_load: called after guest elf image is loaded into
> >    memory to populate any global state in guest memory.
> >
> > Suggested-by: Sean Christopherson <seanjc@...gle.com>
> > Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
> > ---
> >  tools/testing/selftests/kvm/include/kvm_util_base.h | 10 ++++++++++
> >  tools/testing/selftests/kvm/lib/aarch64/processor.c |  8 ++++++++
> >  tools/testing/selftests/kvm/lib/elf.c               |  2 ++
> >  tools/testing/selftests/kvm/lib/kvm_util.c          |  2 ++
> >  tools/testing/selftests/kvm/lib/riscv/processor.c   |  8 ++++++++
> >  tools/testing/selftests/kvm/lib/s390x/processor.c   |  8 ++++++++
> >  tools/testing/selftests/kvm/lib/x86_64/processor.c  |  8 ++++++++
> >  7 files changed, 46 insertions(+)
> >
> > diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > index 9e521d1c8afe..301bef6376a5 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > @@ -834,6 +834,16 @@ 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.
> > + */
> > +void kvm_arch_main(void);
> > +
> > +/*
> > + * API to execute architecture specific setup after loading VMs.
> > + */
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm);
> > +
> >  /*
> >   * API to be implemented by all the selftests.
> >   */
> > diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > index 6f5551368944..a7ca1947d574 100644
> > --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > @@ -528,3 +528,11 @@ 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");
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/elf.c b/tools/testing/selftests/kvm/lib/elf.c
> > index 9f54c098d9d0..f56f9279e703 100644
> > --- a/tools/testing/selftests/kvm/lib/elf.c
> > +++ b/tools/testing/selftests/kvm/lib/elf.c
> > @@ -189,4 +189,6 @@ void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
> >                               phdr.p_filesz);
> >               }
> >       }
> > +
> > +     kvm_arch_post_vm_load(vm);
> >  }
> > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> > index 2e611a021c6e..b778dc684e30 100644
> > --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> > @@ -1985,6 +1985,8 @@ int main(int argc, char *argv[])
> >       /* Tell stdout not to buffer its content */
> >       setbuf(stdout, NULL);
> >
> > +     kvm_arch_main();
> > +
> >       __main(argc, argv);
> >
> >       return 0;
> > diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> > index 604478151212..d992ad5b5771 100644
> > --- a/tools/testing/selftests/kvm/lib/riscv/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> > @@ -362,3 +362,11 @@ void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
> >  void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
> >  {
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
> > index 89d7340d9cbd..3a249783b3fe 100644
> > --- a/tools/testing/selftests/kvm/lib/s390x/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
> > @@ -218,3 +218,11 @@ void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent)
> >  void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
> >  {
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> > index 2e6e61bbe81b..e22cfc4bf284 100644
> > --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
> > @@ -1311,3 +1311,11 @@ bool vm_is_unrestricted_guest(struct kvm_vm *vm)
> >
> >       return val == 'Y';
> >  }
> > +
> > +void kvm_arch_main(void)
> > +{
> > +}
> > +
> > +void kvm_arch_post_vm_load(struct kvm_vm *vm)
> > +{
> > +}
> > --
> > 2.37.2.789.g6183377224-goog
> >