Re: [PATCH v9 19/20] target/riscv/kvm.c: add kvmconfig_get_cfg_addr() helper

[Alistair Francis]

On Thu, Jul 6, 2023 at 8:19 PM Daniel Henrique Barboza
<dbarboza@ventanamicro.com> wrote:
>
> There are 2 places in which we need to get a pointer to a certain
> property of the cpu->cfg struct based on property offset. Next patch
> will add a couple more.
>
> Create a helper to avoid repeating this code over and over.
>
> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  target/riscv/kvm.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index ba940e570e..cfeab5a4c0 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -215,11 +215,15 @@ static KVMCPUConfig kvm_multi_ext_cfgs[] = {
>      KVM_EXT_CFG("svpbmt", ext_svpbmt, KVM_RISCV_ISA_EXT_SVPBMT),
>  };
>
> +static void *kvmconfig_get_cfg_addr(RISCVCPU *cpu, KVMCPUConfig *kvmcfg)
> +{
> +    return (void *)&cpu->cfg + kvmcfg->offset;
> +}
> +
>  static void kvm_cpu_cfg_set(RISCVCPU *cpu, KVMCPUConfig *multi_ext,
>                              uint32_t val)
>  {
> -    int cpu_cfg_offset = multi_ext->offset;
> -    bool *ext_enabled = (void *)&cpu->cfg + cpu_cfg_offset;
> +    bool *ext_enabled = kvmconfig_get_cfg_addr(cpu, multi_ext);
>
>      *ext_enabled = val;
>  }
> @@ -227,8 +231,7 @@ static void kvm_cpu_cfg_set(RISCVCPU *cpu, KVMCPUConfig 
> *multi_ext,
>  static uint32_t kvm_cpu_cfg_get(RISCVCPU *cpu,
>                                  KVMCPUConfig *multi_ext)
>  {
> -    int cpu_cfg_offset = multi_ext->offset;
> -    bool *ext_enabled = (void *)&cpu->cfg + cpu_cfg_offset;
> +    bool *ext_enabled = kvmconfig_get_cfg_addr(cpu, multi_ext);
>
>      return *ext_enabled;
>  }
> --
> 2.41.0
>
>