Re: [PATCH v2 2/8] target/riscv/kvm: add KVM_REG_RISCV_CSR_AIA

[Andrew Jones <ajones@ventanamicro.com>]

On Mon, Feb 24, 2025 at 04:24:09PM +0800, Yong-Xuan Wang wrote:
> Add KVM_REG_RISCV_CSR_AIA support to get/set the context of AIA
> extension in VS mode.
> 
> Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
> ---
>  target/riscv/kvm/kvm-cpu.c | 45 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
> 
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index ff1211d2fe39..c7318f64cf12 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -132,6 +132,9 @@ static uint64_t kvm_riscv_vector_reg_id(RISCVCPU *cpu,
>  #define RISCV_GENERAL_CSR_REG(name) \
>      (KVM_REG_RISCV_CSR_GENERAL | KVM_REG_RISCV_CSR_REG(name))
>  
> +#define RISCV_AIA_CSR_REG(name) \
> +    (KVM_REG_RISCV_CSR_AIA | KVM_REG_RISCV_CSR_AIA_REG(name))
> +
>  #define KVM_RISCV_GET_CSR(cs, env, idx, reg) \
>      do { \
>          int _ret = kvm_get_one_reg(cs, RISCV_CSR_REG(env, idx), &reg); \
> @@ -644,9 +647,50 @@ static int kvm_riscv_put_regs_general_csr(CPUState *cs)
>      return 0;
>  }
>  
> +static int kvm_riscv_get_regs_aia_csr(CPUState *cs)
> +{
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +    uint64_t mask = MAKE_64BIT_MASK(32, 32);
> +    uint64_t val;
> +
> +    KVM_RISCV_GET_CSR(cs, env, RISCV_AIA_CSR_REG(siselect), env->siselect);
> +    KVM_RISCV_GET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio1), env->siprio[0]);
> +    KVM_RISCV_GET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio1h), env->siprio[8]);
> +    KVM_RISCV_GET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio2), env->siprio[16]);
> +    KVM_RISCV_GET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio2h), env->siprio[24]);
> +
> +    KVM_RISCV_GET_CSR(cs, env, RISCV_AIA_CSR_REG(sieh), val);
> +    env->sie = set_field(env->sie, mask, val);
> +    KVM_RISCV_GET_CSR(cs, env, RISCV_AIA_CSR_REG(siph), val);
> +    riscv_cpu_update_mip(env, mask, val);

The *h registers should only s/r on 32-bit targets.

> +
> +    return 0;
> +}
> +
> +static int kvm_riscv_put_regs_aia_csr(CPUState *cs)
> +{
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +    uint64_t mask = MAKE_64BIT_MASK(32, 32);
> +    uint64_t val;
> +
> +    KVM_RISCV_SET_CSR(cs, env, RISCV_AIA_CSR_REG(siselect), env->siselect);
> +    KVM_RISCV_SET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio1), env->siprio[0]);
> +    KVM_RISCV_SET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio1h), env->siprio[8]);
> +    KVM_RISCV_SET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio2), env->siprio[16]);
> +    KVM_RISCV_SET_CSR(cs, env, RISCV_AIA_CSR_REG(iprio2h), env->siprio[24]);
> +
> +    val = get_field(env->sie, mask);
> +    KVM_RISCV_SET_CSR(cs, env, RISCV_AIA_CSR_REG(sieh), val);
> +    val = get_field(env->mip, mask);
> +    KVM_RISCV_SET_CSR(cs, env, RISCV_AIA_CSR_REG(siph), val);
> +
> +    return 0;
> +}
> +
>  static int kvm_riscv_get_regs_csr(CPUState *cs)
>  {
>      kvm_riscv_get_regs_general_csr(cs);
> +    kvm_riscv_get_regs_aia_csr(cs);
>  
>      return 0;
>  }
> @@ -654,6 +698,7 @@ static int kvm_riscv_get_regs_csr(CPUState *cs)
>  static int kvm_riscv_put_regs_csr(CPUState *cs)
>  {
>      kvm_riscv_put_regs_general_csr(cs);
> +    kvm_riscv_put_regs_aia_csr(cs);
>  
>      return 0;
>  }
> -- 
> 2.17.1
>

Thanks,
drew