Re: [Qemu-devel] [PATCH 2/2] lan9118: log and ignore access to invalid registers, rather than aborting

[Jason Wang <jasowang@redhat.com>]

On 12/05/2015 02:58 AM, Andrew Baumann wrote:
> With this change, access to invalid/unimplemented device registers are
> logged as a "guest error" rather than aborting qemu with
> hw_error. This enables drivers for similar devices (e.g. SMSC 9221),
> by simply ignoring the unimplemented writes. It's also closer to what
> real hardware does.
>
> Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
> ---
>  hw/net/lan9118.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)

Applied in my -net for 2.5. Thanks

Btw, looks like there're two more hw_error() in this file, better remove
them also?

Thanks

>
> diff --git a/hw/net/lan9118.c b/hw/net/lan9118.c
> index 133fd3d..1734b52 100644
> --- a/hw/net/lan9118.c
> +++ b/hw/net/lan9118.c
> @@ -904,7 +904,8 @@ static void do_mac_write(lan9118_state *s, int reg, uint32_t val)
>           */
>          break;
>      default:
> -        hw_error("lan9118: Unimplemented MAC register write: %d = 0x%x\n",
> +        qemu_log_mask(LOG_GUEST_ERROR,
> +                      "lan9118: Unimplemented MAC register write: %d = 0x%x\n",
>                   s->mac_cmd & 0xf, val);
>      }
>  }
> @@ -932,8 +933,10 @@ static uint32_t do_mac_read(lan9118_state *s, int reg)
>      case MAC_FLOW:
>          return s->mac_flow;
>      default:
> -        hw_error("lan9118: Unimplemented MAC register read: %d\n",
> +        qemu_log_mask(LOG_GUEST_ERROR,
> +                      "lan9118: Unimplemented MAC register read: %d\n",
>                   s->mac_cmd & 0xf);
> +        return 0;
>      }
>  }
>  
> @@ -1130,7 +1133,8 @@ static void lan9118_writel(void *opaque, hwaddr offset,
>          break;
>  
>      default:
> -        hw_error("lan9118_write: Bad reg 0x%x = %x\n", (int)offset, (int)val);
> +        qemu_log_mask(LOG_GUEST_ERROR, "lan9118_write: Bad reg 0x%x = %x\n",
> +                      (int)offset, (int)val);
>          break;
>      }
>      lan9118_update(s);
> @@ -1248,7 +1252,7 @@ static uint64_t lan9118_readl(void *opaque, hwaddr offset,
>      case CSR_E2P_DATA:
>          return s->e2p_data;
>      }
> -    hw_error("lan9118_read: Bad reg 0x%x\n", (int)offset);
> +    qemu_log_mask(LOG_GUEST_ERROR, "lan9118_read: Bad reg 0x%x\n", (int)offset);
>      return 0;
>  }
>