Re: [Qemu-devel] [PATCH v3 2/3] pc-bios/s390-ccw/net: Use diag308 to reset machine before jumping to the OS

[Christian Borntraeger]

On 04/25/2018 11:08 AM, Thomas Huth wrote:

> --- a/pc-bios/s390-ccw/netmain.c
> +++ b/pc-bios/s390-ccw/netmain.c
> @@ -283,6 +283,15 @@ void panic(const char *string)
>      }
>  }
>  
> +void write_subsystem_identification(void)
> +{
> +    uint32_t *schid = (uint32_t *) 184;
> +    uint32_t *zeroes = (uint32_t *) 188;
> +
> +    *schid = 0;         /* We must not set this for virtio-net */
> +    *zeroes = 0;
> +}
> +


I think we actually want to have the CCW devno of that network device
stored. It has some value to know which CCW device we bootet from, no?