Re: [PATCH for-9.0 2/5] target/riscv/kvm: change KVM_REG_RISCV_FP_D to u64

[Andrew Jones <ajones@ventanamicro.com>]

On Fri, Dec 08, 2023 at 03:38:32PM -0300, Daniel Henrique Barboza wrote:
> KVM_REG_RISCV_FP_D regs are always u64 size. Using kvm_riscv_reg_id() in
> RISCV_FP_D_REG() ends up encoding the wrong size if we're running with
> TARGET_RISCV32.
> 
> Create a new helper that returns a KVM ID with u64 size and use it with
> RISCV_FP_D_REG().
> 
> Reported-by: Andrew Jones <ajones@ventanamicro.com>
> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
> ---
>  target/riscv/kvm/kvm-cpu.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index 9bfbc4ac98..34ed82ebe5 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -77,6 +77,11 @@ static uint64_t kvm_riscv_reg_id_u32(uint64_t type, uint64_t idx)
>      return KVM_REG_RISCV | KVM_REG_SIZE_U32 | type | idx;
>  }
>  
> +static uint64_t kvm_riscv_reg_id_u64(uint64_t type, uint64_t idx)
> +{
> +    return KVM_REG_RISCV | KVM_REG_SIZE_U64 | type | idx;
> +}
> +
>  #define RISCV_CORE_REG(env, name)  kvm_riscv_reg_id(env, KVM_REG_RISCV_CORE, \
>                   KVM_REG_RISCV_CORE_REG(name))
>  
> @@ -88,7 +93,7 @@ static uint64_t kvm_riscv_reg_id_u32(uint64_t type, uint64_t idx)
>  
>  #define RISCV_FP_F_REG(idx)  kvm_riscv_reg_id_u32(KVM_REG_RISCV_FP_F, idx)
>  
> -#define RISCV_FP_D_REG(env, idx)  kvm_riscv_reg_id(env, KVM_REG_RISCV_FP_D, idx)
> +#define RISCV_FP_D_REG(idx)  kvm_riscv_reg_id_u64(KVM_REG_RISCV_FP_D, idx)
>  
>  #define KVM_RISCV_GET_CSR(cs, env, csr, reg) \
>      do { \
> @@ -579,7 +584,7 @@ static int kvm_riscv_get_regs_fp(CPUState *cs)
>      if (riscv_has_ext(env, RVD)) {
>          uint64_t reg;
>          for (i = 0; i < 32; i++) {
> -            ret = kvm_get_one_reg(cs, RISCV_FP_D_REG(env, i), &reg);
> +            ret = kvm_get_one_reg(cs, RISCV_FP_D_REG(i), &reg);
>              if (ret) {
>                  return ret;
>              }
> @@ -613,7 +618,7 @@ static int kvm_riscv_put_regs_fp(CPUState *cs)
>          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);
> +            ret = kvm_set_one_reg(cs, RISCV_FP_D_REG(i), &reg);
>              if (ret) {
>                  return ret;
>              }
> -- 
> 2.41.0
>

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

afaict, we're also missing fcsr here. And watch out for D's fcsr, it's
32-bit, even though the rest of the registers are 64-bit.

Thanks,
drew