From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Chen, Tiejun" <tiejun.chen@intel.com>
Subject: Re: [v4][PATCH 11/19] tools: introduce some new
 parameters to set rdm policy
Date: Wed, 01 Jul 2015 18:26:43 +0800
Message-ID: <5593C063.7000705@intel.com>
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To: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

>>> 1. By default, the domain policy is RELAXED (See above,
>>> libxl__rdm_setdefault()).
>>>
>>> 2. By default, the policy for individual devices is STRICT (see
>>> libxl_pci.c:libxl__device_pci_setdefault())
>>>
>>> 3. If the domain policy is set to STRICT, this overrides per-device
>>> policy
>>>
>>> 4. If the domain policy is set to RELAXED, I don't see that having an
>>> effect on individual devices
>>
>> This is our rule, and this is why I think you need to take a look at
>> patch #00, our design and all patch head descriptions,
>>
>> "Default per-device RDM policy is 'strict', while default global RDM
>> policy is 'relaxed'. When both policies are specified on a given region,
>> 'strict' is always preferred."
>
> It looks like you didn't finish reading my message.  I suggest you do so:

Okay.

>
>>> If I'm correct, then #3 means it's not possible to have devices for a
>>> domain *default* to strict, but to be relaxed in individual instances.
>>> If you had five devices you wanted strict, and only one device you
>>> wanted to be relaxed (because you knew it didn't matter), you'd have
>>> to set reserved=strict for all the other devices, rather than just
>>> being able to set the domain setting to strict and set reserve=relaxed
>>> for the one.
>>>
>>> I think that both violates the principle of least surprise, and is
>>> less useful.
>

So what's you idea to follow our requirement?

Thanks
Tiejun