Re: [Xen-devel] Xen 4.3 development update RC2 imminent

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Mon, May 20, 2013 at 12:46 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Mon, 2013-05-20 at 12:32 +0100, George Dunlap wrote:
>> On 20/05/13 12:16, Ian Campbell wrote:
>> > On Mon, 2013-05-20 at 12:09 +0100, George Dunlap wrote:
>> >> I think long-term we probably want to sort out the "right" way to do
>> >> this -- ideally I think we'd like there to be a "config on next reboot"
>> >> that one could manipulate while the VM is running -- manually changing
>> >> such things as the number of vcpus or amount of memory, automatically
>> >> updating things like the cdrom and the mac address.
>> > We already have the manual version via "xl config-update", but that's
>> > really just a workaround for the cdrom/mac address issues.
>>
>> Then is the problem:
>> 1. The randomly generated mac is not being stored automatically in the
>> config?
>> 2. The mac is being clobbered when re-loading the config file on reboot?
>>
>> If it's #1, it seems like it should be relatively straightforward to
>> sort out.
>
> It's #1, but it's not straight forward to sort out.
>
> The stored config is just the raw config file from the user, we don't
> parse it in a form where we could modify and then regurgitate. We can
> append lines. We could try and append a new vif line equivalent to (and
> overriding) the user supplied one but with the mac addresses in place.
> Or we could perhaps define a new internal config file option which lets
> us set only the mac addresses for previously declared vifs.

Right -- well cost/benefits wise we should probably put this off until
4.4, I guess.

 -George

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