From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ed White <edmund.h.white@intel.com>
Subject: Re: [PATCH v2 11/12] x86/altp2m: Add altp2mhvm HVM
	domain parameter.
Date: Wed, 24 Jun 2015 10:57:50 -0700
Message-ID: <558AEF9E.9090505@intel.com>
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	<1434999372-3688-12-git-send-email-edmund.h.white@intel.com>
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To: Jan Beulich <JBeulich@suse.com>
Cc: Tim Deegan <tim@xen.org>, Ravi Sahita <ravi.sahita@intel.com>, Wei Liu <wei.liu2@citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, xen-devel@lists.xen.org, tlengyel@novetta.com, Daniel De Graaf <dgdegra@tycho.nsa.gov>
List-Id: xen-devel@lists.xenproject.org

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