linux-kernel - Re: [PATCH 4/9] RISC-V: KVM: Use switch-case in kvm_riscv_vcpu_set/get

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Message-ID: <CAOnJCULajHen9us+AePGKarM1xSXp0wVBXyz7ySQyZz9YQvFaQ@mail.gmail.com>
Date:   Mon, 28 Nov 2022 13:04:42 -0800
From:   Atish Patra <atishp@...shpatra.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] RISC-V: KVM: Use switch-case in kvm_riscv_vcpu_set/get_reg()

On Mon, Nov 28, 2022 at 8:14 AM Anup Patel <apatel@...tanamicro.com> wrote:
>
> We should use switch-case in kvm_riscv_vcpu_set/get_reg() functions
> because the else-if ladder is quite big now.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  arch/riscv/kvm/vcpu.c | 36 ++++++++++++++++++++++--------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
>
> diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
> index 982a3f5e7130..68c86f632d37 100644
> --- a/arch/riscv/kvm/vcpu.c
> +++ b/arch/riscv/kvm/vcpu.c
> @@ -544,22 +544,26 @@ static int kvm_riscv_vcpu_set_reg_isa_ext(struct kvm_vcpu *vcpu,
>  static int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
>                                   const struct kvm_one_reg *reg)
>  {
> -       if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CONFIG)
> +       switch (reg->id & KVM_REG_RISCV_TYPE_MASK) {
> +       case KVM_REG_RISCV_CONFIG:
>                 return kvm_riscv_vcpu_set_reg_config(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CORE)
> +       case KVM_REG_RISCV_CORE:
>                 return kvm_riscv_vcpu_set_reg_core(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CSR)
> +       case KVM_REG_RISCV_CSR:
>                 return kvm_riscv_vcpu_set_reg_csr(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_TIMER)
> +       case KVM_REG_RISCV_TIMER:
>                 return kvm_riscv_vcpu_set_reg_timer(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_F)
> +       case KVM_REG_RISCV_FP_F:
>                 return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
>                                                  KVM_REG_RISCV_FP_F);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_D)
> +       case KVM_REG_RISCV_FP_D:
>                 return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
>                                                  KVM_REG_RISCV_FP_D);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_ISA_EXT)
> +       case KVM_REG_RISCV_ISA_EXT:
>                 return kvm_riscv_vcpu_set_reg_isa_ext(vcpu, reg);
> +       default:
> +               break;
> +       }
>
>         return -EINVAL;
>  }
> @@ -567,22 +571,26 @@ static int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
>  static int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
>                                   const struct kvm_one_reg *reg)
>  {
> -       if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CONFIG)
> +       switch (reg->id & KVM_REG_RISCV_TYPE_MASK) {
> +       case KVM_REG_RISCV_CONFIG:
>                 return kvm_riscv_vcpu_get_reg_config(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CORE)
> +       case KVM_REG_RISCV_CORE:
>                 return kvm_riscv_vcpu_get_reg_core(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_CSR)
> +       case KVM_REG_RISCV_CSR:
>                 return kvm_riscv_vcpu_get_reg_csr(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_TIMER)
> +       case KVM_REG_RISCV_TIMER:
>                 return kvm_riscv_vcpu_get_reg_timer(vcpu, reg);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_F)
> +       case KVM_REG_RISCV_FP_F:
>                 return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
>                                                  KVM_REG_RISCV_FP_F);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_D)
> +       case KVM_REG_RISCV_FP_D:
>                 return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
>                                                  KVM_REG_RISCV_FP_D);
> -       else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_ISA_EXT)
> +       case KVM_REG_RISCV_ISA_EXT:
>                 return kvm_riscv_vcpu_get_reg_isa_ext(vcpu, reg);
> +       default:
> +               break;
> +       }
>
>         return -EINVAL;
>  }
> --
> 2.34.1
>


Reviewed-by: Atish Patra <atishp@...osinc.com>
-- 
Regards,
Atish