Re: [PATCH v2 05/12] target/riscv: Implement kvm_arch_put_registers

[Anup Patel]

On Fri, Dec 10, 2021 at 3:37 PM Yifei Jiang <jiangyifei@huawei.com> wrote:
>
> Put GPR CSR and FP registers to kvm by KVM_SET_ONE_REG ioctl
>
> Signed-off-by: Yifei Jiang <jiangyifei@huawei.com>
> Signed-off-by: Mingwang Li <limingwang@huawei.com>
> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Looks good to me.

Reviewed-by: Anup Patel <anup.patel@wdc.com>

Regards,
Anup

> ---
>  target/riscv/kvm.c | 104 ++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 103 insertions(+), 1 deletion(-)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index 6d4df0ef6d..e695b91dc7 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -73,6 +73,14 @@ static uint64_t kvm_riscv_reg_id(CPURISCVState *env, 
> uint64_t type, uint64_t idx
>          } \
>      } while(0)
>
> +#define KVM_RISCV_SET_CSR(cs, env, csr, reg) \
> +    do { \
> +        int ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, csr), &reg); \
> +        if (ret) { \
> +            return ret; \
> +        } \
> +    } while(0)
> +
>  static int kvm_riscv_get_regs_core(CPUState *cs)
>  {
>      int ret = 0;
> @@ -98,6 +106,31 @@ static int kvm_riscv_get_regs_core(CPUState *cs)
>      return ret;
>  }
>
> +static int kvm_riscv_put_regs_core(CPUState *cs)
> +{
> +    int ret = 0;
> +    int i;
> +    target_ulong reg;
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +
> +    reg = env->pc;
> +    ret = kvm_set_one_reg(cs, RISCV_CORE_REG(env, regs.pc), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    for (i = 1; i < 32; i++) {
> +        uint64_t id = kvm_riscv_reg_id(env, KVM_REG_RISCV_CORE, i);
> +        reg = env->gpr[i];
> +        ret = kvm_set_one_reg(cs, id, &reg);
> +        if (ret) {
> +            return ret;
> +        }
> +    }
> +
> +    return ret;
> +}
> +
>  static int kvm_riscv_get_regs_csr(CPUState *cs)
>  {
>      int ret = 0;
> @@ -115,6 +148,24 @@ static int kvm_riscv_get_regs_csr(CPUState *cs)
>      return ret;
>  }
>
> +static int kvm_riscv_put_regs_csr(CPUState *cs)
> +{
> +    int ret = 0;
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +
> +    KVM_RISCV_SET_CSR(cs, env, sstatus, env->mstatus);
> +    KVM_RISCV_SET_CSR(cs, env, sie, env->mie);
> +    KVM_RISCV_SET_CSR(cs, env, stvec, env->stvec);
> +    KVM_RISCV_SET_CSR(cs, env, sscratch, env->sscratch);
> +    KVM_RISCV_SET_CSR(cs, env, sepc, env->sepc);
> +    KVM_RISCV_SET_CSR(cs, env, scause, env->scause);
> +    KVM_RISCV_SET_CSR(cs, env, stval, env->stval);
> +    KVM_RISCV_SET_CSR(cs, env, sip, env->mip);
> +    KVM_RISCV_SET_CSR(cs, env, satp, env->satp);
> +
> +    return ret;
> +}
> +
>  static int kvm_riscv_get_regs_fp(CPUState *cs)
>  {
>      int ret = 0;
> @@ -148,6 +199,40 @@ static int kvm_riscv_get_regs_fp(CPUState *cs)
>      return ret;
>  }
>
> +static int kvm_riscv_put_regs_fp(CPUState *cs)
> +{
> +    int ret = 0;
> +    int i;
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +
> +    if (riscv_has_ext(env, RVD)) {
> +        uint64_t reg;
> +        for (i = 0; i < 32; i++) {
> +            reg = env->fpr[i];
> +            ret = kvm_set_one_reg(cs, RISCV_FP_D_REG(env, i), &reg);
> +            if (ret) {
> +                return ret;
> +            }
> +        }
> +        return ret;
> +    }
> +
> +    if (riscv_has_ext(env, RVF)) {
> +        uint32_t reg;
> +        for (i = 0; i < 32; i++) {
> +            reg = env->fpr[i];
> +            ret = kvm_set_one_reg(cs, RISCV_FP_F_REG(env, i), &reg);
> +            if (ret) {
> +                return ret;
> +            }
> +        }
> +        return ret;
> +    }
> +
> +    return ret;
> +}
> +
> +
>  const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
>      KVM_CAP_LAST_INFO
>  };
> @@ -176,7 +261,24 @@ int kvm_arch_get_registers(CPUState *cs)
>
>  int kvm_arch_put_registers(CPUState *cs, int level)
>  {
> -    return 0;
> +    int ret = 0;
> +
> +    ret = kvm_riscv_put_regs_core(cs);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    ret = kvm_riscv_put_regs_csr(cs);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    ret = kvm_riscv_put_regs_fp(cs);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    return ret;
>  }
>
>  int kvm_arch_release_virq_post(int virq)
> --
> 2.19.1
>