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References: <cover.1687515463.git.haibo1.xu@intel.com> <fa6b80b578553e561ccacaeb24091e0716975593.1687515463.git.haibo1.xu@intel.com>
 <20230627-feb5bf584a3fd16d2c0ffe66@orel>
In-Reply-To: <20230627-feb5bf584a3fd16d2c0ffe66@orel>
From:   Haibo Xu <xiaobo55x@gmail.com>
Date:   Wed, 28 Jun 2023 18:29:09 +0800
Message-ID: <CAJve8o=CN4TJz5R9+zne_mA9L_doNTwg+w39OgU5HKXPzb4hmg@mail.gmail.com>
Subject: Re: [PATCH v4 11/12] KVM: riscv: selftests: Add finalize_vcpu check
 in run_test
To:     Andrew Jones <ajones@ventanamicro.com>
Cc:     Haibo Xu <haibo1.xu@intel.com>, maz@kernel.org,
        oliver.upton@linux.dev, seanjc@google.com,
        Paolo Bonzini <pbonzini@redhat.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Anup Patel <anup@brainfault.org>,
        Atish Patra <atishp@atishpatra.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Shuah Khan <shuah@kernel.org>,
        James Morse <james.morse@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Zenghui Yu <yuzenghui@huawei.com>,
        David Matlack <dmatlack@google.com>,
        Ben Gardon <bgardon@google.com>,
        Ricardo Koller <ricarkol@google.com>,
        Vishal Annapurve <vannapurve@google.com>,
        Vipin Sharma <vipinsh@google.com>,
        Colton Lewis <coltonlewis@google.com>, kvm@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org,
        linux-kselftest@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev
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Thanks a lot!

On Tue, Jun 27, 2023 at 5:16=E2=80=AFPM Andrew Jones <ajones@ventanamicro.c=
om> wrote:
>
> On Fri, Jun 23, 2023 at 06:40:13PM +0800, Haibo Xu wrote:
> > Disable all vcpu extensions which were enabled by default
> > if they were available in the risc-v host, and only enable
> > the desired one for a vcpu_config.
> >
> > Suggested-by: Andrew Jones <ajones@ventanamicro.com>
> > Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> > ---
> >  tools/testing/selftests/kvm/get-reg-list.c | 42 +++++++++++++++++++++-
> >  1 file changed, 41 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/testing/selftests/kvm/get-reg-list.c b/tools/testing=
/selftests/kvm/get-reg-list.c
> > index 3beb6b62de0a..612dabc61137 100644
> > --- a/tools/testing/selftests/kvm/get-reg-list.c
> > +++ b/tools/testing/selftests/kvm/get-reg-list.c
> > @@ -138,11 +138,50 @@ static struct kvm_vcpu *vcpu_config_get_vcpu(stru=
ct vcpu_reg_list *c, struct kvm
> >       prepare_vcpu_init(c, &init);
> >       vcpu =3D __vm_vcpu_add(vm, 0);
> >       aarch64_vcpu_setup(vcpu, &init);
> > -     finalize_vcpu(vcpu, c);
> >
> >       return vcpu;
> >  }
> >  #else
> > +static inline bool vcpu_has_ext(struct kvm_vcpu *vcpu, int ext)
> > +{
> > +     int ret;
> > +     unsigned long value;
> > +
> > +     ret =3D __vcpu_get_reg(vcpu, RISCV_ISA_EXT_REG(ext), &value);
> > +     if (ret) {
> > +             printf("Failed to get ext %d", ext);
> > +             return false;
> > +     }
> > +
> > +     return !!value;
> > +}
> > +
> > +static void finalize_vcpu(struct kvm_vcpu *vcpu, struct vcpu_reg_list =
*c)
> > +{
> > +     struct vcpu_reg_sublist *s;
> > +
> > +     /*
> > +      * Disable all extensions which were enabled by default
> > +      * if they were available in the risc-v host.
> > +      */
> > +     for (int i =3D 0; i < KVM_RISCV_ISA_EXT_MAX; i++) {
> > +             __vcpu_set_reg(vcpu, RISCV_ISA_EXT_REG(i), 0);
> > +     }
>
> nit: can drop the {}
>
> > +
> > +     for_each_sublist(c, s) {
> > +             if (!s->feature)
> > +                     continue;
> > +
> > +             /* Try to enable the desired extension */
> > +             __vcpu_set_reg(vcpu, RISCV_ISA_EXT_REG(s->feature), 1);
> > +
> > +             /* Double check whether the desired extension was enabled=
 */
> > +             __TEST_REQUIRE(vcpu_has_ext(vcpu, s->feature),
> > +                            "%s: %s not available, skipping tests\n",
> > +                            config_name(c), s->name);
> > +     }
> > +}
> > +
> >  static struct kvm_vcpu *vcpu_config_get_vcpu(struct vcpu_reg_list *c, =
struct kvm_vm *vm)
> >  {
> >       return __vm_vcpu_add(vm, 0);
> > @@ -178,6 +217,7 @@ static void run_test(struct vcpu_reg_list *c)
> >
> >       vm =3D vm_create_barebones();
> >       vcpu =3D vcpu_config_get_vcpu(c, vm);
> > +     finalize_vcpu(vcpu, c);
>
> Now that both arm and riscv call finalize_vcpu() we could do the weak
> function trick for it and move the arch-specific implementations to
> their own arch-specific files.
>
> >
> >       reg_list =3D vcpu_get_reg_list(vcpu);
> >
> > --
> > 2.34.1
> >
>
> Otherwise,
>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
>
> Thanks,
> drew