Re: [PATCH 4/9] RISC-V: KVM: Use switch-case in kvm_riscv_vcpu_set/get_reg()

Atish Patra
2022-11-28T21:05:28Z

On Mon, Nov 28, 2022 at 8:14 AM Anup Patel <apatel@ventanamicro.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@ventanamicro.com>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.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@rivosinc.com>
--
Regards,
Atish