linux-kernel - Re: [PATCH 12/12] xen: import arch generic part of xencomm.

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Date:	Mon, 31 Mar 2008 08:01:13 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Isaku Yamahata <yamahata@...inux.co.jp>
CC:	chrisw@...s-sol.org, sct@...hat.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, xen-ia64-devel@...ts.xensource.com,
	eddie.dong@...el.com
Subject: Re: [PATCH 12/12] xen: import arch generic part of xencomm.

Isaku Yamahata wrote:
> On Fri, Mar 28, 2008 at 01:09:48PM -0700, Jeremy Fitzhardinge wrote:
>   
>> Isaku Yamahata wrote:
>>     
>>> On xen/ia64 and xen/powerpc hypercall arguments are passed by pseudo
>>> physical address (guest physical address) so that it's necessary to
>>> convert from virtual address into pseudo physical address. The frame
>>> work is called xencomm.
>>> Import arch generic part of xencomm.
>>>
>>> Signed-off-by: Isaku Yamahata <yamahata@...inux.co.jp>
>>> ---
>>> drivers/xen/Makefile            |    1 +
>>> drivers/xen/xencomm.c           |  232 
>>> +++++++++++++++++++++++++++++++++++++++
>>> include/xen/interface/xencomm.h |   41 +++++++
>>> include/xen/xencomm.h           |   77 +++++++++++++
>>>  
>>>       
>> There's no Kconfig for this.
>>
>> What ends up using xencomm?  Could we defer adding it until there's an 
>> in-tree user?
>>     
>
> We are in a dilemma.
> ia64/xen needs xencomm so that it needs common xencomm code.
> However merging common xencomm code needs the real user i.e. ia64/xen.
>
> Another user of xencomm is powerpc/xen which isn't merged into
> upstream. So another choice would be
> - put the file into ia64 specific directory and
>   merge the file through linux-ia64.
>   When another user appears (possibly powerpc/xen),
>   move the file into common place (drivers/xen).
>
> We're now struggling for ia64/xen domU merge, so we want to make
> ia64/xen domU patch series as small as possible.
> Putting the file into drivers/xen is desirable for that.
> However either way is ok.
> Which way do you want (putting common dir or ia64 specfic dir)?

No, it's fine as-is.

    J
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