Re: [PATCH v7 04/20] xen/riscv: introduce guest riscv,isa string

[Jan Beulich <jbeulich@xxxxxxxx>]

On 04.08.2026 17:47, Oleksii Kurochko wrote:
> @@ -120,29 +148,30 @@ static int __init dt_get_cpuid_from_node(const struct 
> dt_device_node *cpu,
>   * and strncmp() is used in match_isa_ext() to compare extension names 
> instead
>   * of strncasecmp().
>   */
> -const struct riscv_isa_ext_data __initconst riscv_isa_ext[] = {
> -    RISCV_ISA_EXT_DATA(i),
> -    RISCV_ISA_EXT_DATA(m),
> -    RISCV_ISA_EXT_DATA(a),
> -    RISCV_ISA_EXT_DATA(f),
> -    RISCV_ISA_EXT_DATA(d),
> -    RISCV_ISA_EXT_DATA(q),
> -    RISCV_ISA_EXT_DATA(c),
> -    RISCV_ISA_EXT_DATA(h),
> -    RISCV_ISA_EXT_DATA(zicntr),
> -    RISCV_ISA_EXT_DATA(zicsr),
> -    RISCV_ISA_EXT_DATA(zifencei),
> -    RISCV_ISA_EXT_DATA(zihintpause),
> -    RISCV_ISA_EXT_DATA(zihpm),
> -    RISCV_ISA_EXT_DATA(zba),
> -    RISCV_ISA_EXT_DATA(zbb),
> -    RISCV_ISA_EXT_DATA(zbs),
> -    RISCV_ISA_EXT_DATA(smaia),
> -    RISCV_ISA_EXT_DATA(smstateen),
> -    RISCV_ISA_EXT_DATA(ssaia),
> -    RISCV_ISA_EXT_DATA(sstc),
> -    RISCV_ISA_EXT_DATA(svade),
> -    RISCV_ISA_EXT_DATA(svpbmt),
> +static const struct riscv_isa_ext_entry __initconstrel riscv_isa_ext[] = {
> +    RISCV_ISA_EXT_ENTRY(i,            true),
> +    RISCV_ISA_EXT_ENTRY(m,            true),
> +    RISCV_ISA_EXT_ENTRY(a,            true),
> +    RISCV_ISA_EXT_ENTRY(f,            false),
> +    RISCV_ISA_EXT_ENTRY(d,            false),
> +    RISCV_ISA_EXT_ENTRY(q,            false),
> +    RISCV_ISA_EXT_ENTRY(c,            true),
> +    RISCV_ISA_EXT_ENTRY(v,            false),
> +    RISCV_ISA_EXT_ENTRY(h,            false),
> +    RISCV_ISA_EXT_ENTRY(zicntr,       true),
> +    RISCV_ISA_EXT_ENTRY(zicsr,        true),
> +    RISCV_ISA_EXT_ENTRY(zifencei,     true),
> +    RISCV_ISA_EXT_ENTRY(zihintpause,  true),
> +    RISCV_ISA_EXT_ENTRY(zihpm,        true),
> +    RISCV_ISA_EXT_ENTRY(zba,          true),
> +    RISCV_ISA_EXT_ENTRY(zbb,          true),
> +    RISCV_ISA_EXT_ENTRY(zbs,          true),
> +    RISCV_ISA_EXT_ENTRY(smaia,        true),
> +    RISCV_ISA_EXT_ENTRY(smstateen,    true),
> +    RISCV_ISA_EXT_ENTRY(ssaia,        true),
> +    RISCV_ISA_EXT_ENTRY(sstc,         false),
> +    RISCV_ISA_EXT_ENTRY(svade,        false),
> +    RISCV_ISA_EXT_ENTRY(svpbmt,       false),
>  };

Just as an independent, up front remark after having looked at patch 16/17 of
the other series: Is a mere boolean going to suffice in the longer run? I could
see some extensions wanting exposing to only RV32 or only RV64 guests. E.g.
Zilsd is RV32-only, while Zqinx quite likely would want restricting to RV64.

Jan