Re: [PATCH] target/riscv: fix SBI getchar handler for KVM

[Alistair Francis]

On Sat, Feb 4, 2023 at 12:03 AM Vladimir Isaev
<vladimir.isaev@syntacore.com> wrote:
>
> Character must be returned via ret[0] field (copied to a0 by KVM).
>
> Return value should be set to 0 to indicate successful processing.
>
> Signed-off-by: Vladimir Isaev <vladimir.isaev@syntacore.com>

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

Alistair

> ---
>  target/riscv/kvm.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index 30f21453d69c..0f932a5b966e 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -467,10 +467,11 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct 
> kvm_run *run)
>      case SBI_EXT_0_1_CONSOLE_GETCHAR:
>          ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
>          if (ret == sizeof(ch)) {
> -            run->riscv_sbi.args[0] = ch;
> +            run->riscv_sbi.ret[0] = ch;
>          } else {
> -            run->riscv_sbi.args[0] = -1;
> +            run->riscv_sbi.ret[0] = -1;
>          }
> +        ret = 0;
>          break;
>      default:
>          qemu_log_mask(LOG_UNIMP,
> --
> 2.39.1
>
>