netdev - RE: [PATCH net-next] sysfs: add entry to indicate network interfaces with random MAC address

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Message-ID: <43F901BD926A4E43B106BF17856F0755F1846287@orsmsx508.amr.corp.intel.com>
Date:	Wed, 21 Jul 2010 12:35:36 -0700
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	David Miller <davem@...emloft.net>
CC:	"leedom@...lsio.com" <leedom@...lsio.com>,
	"shemminger@...tta.com" <shemminger@...tta.com>,
	"andy@...yhouse.net" <andy@...yhouse.net>,
	"harald@...hat.com" <harald@...hat.com>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"Duyck, Alexander H" <alexander.h.duyck@...el.com>
Subject: RE: [PATCH net-next] sysfs: add entry to indicate network
 interfaces with random MAC address

>-----Original Message-----
>From: David Miller [mailto:davem@...emloft.net]
>Sent: Wednesday, July 21, 2010 12:33 PM
>To: Rose, Gregory V
>Cc: leedom@...lsio.com; shemminger@...tta.com; andy@...yhouse.net;
>harald@...hat.com; bhutchings@...arflare.com; sassmann@...hat.com;
>netdev@...r.kernel.org; linux-kernel@...r.kernel.org; gospo@...hat.com;
>Duyck, Alexander H
>Subject: Re: [PATCH net-next] sysfs: add entry to indicate network
>interfaces with random MAC address
>
>From: "Rose, Gregory V" <gregory.v.rose@...el.com>
>Date: Wed, 21 Jul 2010 12:02:17 -0700
>
>>>From: David Miller <davem@...emloft.net>
>>>Date: Wed, 21 Jul 2010 11:48:51 -0700 (PDT)
>>>
>>>> You could do things like have the PF controller use the root
>>>filesystem
>>>> ID label to construct the VF's MAC address, or something like that.
>>>
>>>And here I of course mean the root filesystem of the guest the VF will
>>>be given to.
>>
>> I suppose you could do that but then the VM is going to have to be
>> allowed to set its own MAC address.  There is a lot of opposition
>> and concern about allowing VMs to set their own MAC address.
>
>Why would that be necessary?  The host with the PF creating the guest
>has access to the "device" and thus the root filesystem of the guest,
>and thus could pull in the root filesystem "key" and instantiate the
>VF's MAC before booting the guest.
>
>That was the idea, the control node sets up the VF MAC before the guest
>boots or can have access to the VF device.

I misunderstood you.  My bad.

Thank for the further explanation.

- Greg

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