Re: [PATCH v2 11/12] x86/altp2m: Add altp2mhvm HVM domain parameter.

[Ed White <edmund.h.white@intel.com>]

On 06/24/2015 07:59 AM, Jan Beulich wrote:
>>>> On 22.06.15 at 20:56, <edmund.h.white@intel.com> wrote:
>> +    case HVM_PARAM_ALTP2MHVM:
>> +        if ( a.value > 1 )
>> +            rc = -EINVAL;
>> +        if ( a.value &&
>> +             d->arch.hvm_domain.params[HVM_PARAM_NESTEDHVM] )
>> +            rc = -EINVAL;
>> +        break;
> 
> As you added the new param to the change-once section of
> hvm_allow_set_param() - what is this code good for?

I don't understand. How does change-once invalidate this code?

Ed