Re: [Xen-devel] [PATCH, v2] add privileged/unprivileged kernel feature indication

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 21.07.11 at 10:38, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> wrote:
> On Thu, 2011-07-21 at 09:16 +0100, Jan Beulich wrote:
>> > You also have not explained _why_ a dom0-only guest would be a useful
>> > thing to have and to add extra complexity to our interfaces for, it's
>> > obviously very much a corner case.
>> 
>> It's really a decision between having efficient code (i.e. as little
>> unused code as possible in a kernel suiting a particular need) and
>> having a (relatively) general-purpose kernel.
> 
> We are talking about half a dozen lines of code to spit out a static
> string ("I don't support domU operation") to the domU and/or a guest

You still didn't tell where such a message would show up: Printing
such a message isn't a big deal, but pointless if it goes into no-where.
If instead the hypervisor (for Dom0) or the tools (for DomU-s) print
something, this will be visible in a known place.

Jan



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