Re: [PATCH v2 7/9] tz-ppc: add dummy read/write methods

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 6/24/20 8:55 PM, P J P wrote:
> From: Prasad J Pandit <pjp@fedoraproject.org>
> 
> Add tz-ppc-dummy mmio read/write methods to avoid assert failure
> during initialisation.
> 
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
> ---
>  hw/misc/tz-ppc.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/hw/misc/tz-ppc.c b/hw/misc/tz-ppc.c
> index 6431257b52..dc8892f61f 100644
> --- a/hw/misc/tz-ppc.c
> +++ b/hw/misc/tz-ppc.c
> @@ -196,7 +196,22 @@ static bool tz_ppc_dummy_accepts(void *opaque, hwaddr addr,
>      g_assert_not_reached();

This is a shame we now have to fill the read/write handlers for
unreachable code :(

>  }
>  
> +static uint64_t tz_ppc_dummy_read(void *opaque, hwaddr addr, unsigned size)
> +{

I'd instead use a clearer:

       g_assert_not_reached();

> +    qemu_log_mask(LOG_GUEST_ERROR, "%s not implemented\n", __func__);
> +    return 0;
> +}
> +
> +static void tz_ppc_dummy_write(void *opaque, hwaddr addr,
> +                                        uint64_t data, unsigned size)
> +{

Ditto:

       g_assert_not_reached();

> +    qemu_log_mask(LOG_GUEST_ERROR, "%s not implemented\n", __func__);
> +}
> +
>  static const MemoryRegionOps tz_ppc_dummy_ops = {
> +    /* define r/w methods to avoid assert failure in memory_region_init_io */
> +    .read = tz_ppc_dummy_read,
> +    .write = tz_ppc_dummy_write,
>      .valid.accepts = tz_ppc_dummy_accepts,
>  };
>  
>