Re: Issue with ARM: Network doesn't work in the guest

[Julien Grall <julien.grall@linaro.org>]

On 11/06/2013 10:12 AM, Stefano Stabellini wrote:
> On Wed, 30 Oct 2013, mail fetch wrote:
>> 2013/10/29, mail fetch <fetchmail.0104@gmail.com>:
>>> Hi all,
>>>
>>> I just saw a know bug from wiki that network doesn't work in guest in
>>> arndale board :
>>>
>>> Network doesn't work in the guest
>>>
>>> Contact: julien.grall@citrix.com
>>> Status: In progress
>>> Description: Network doesn't work in the guest when an ehternet cable is
>>> plugged
>>> References: http://pastebin.com/gEP3HdCg
>>>
>>> What's the latest status?
>>>
>>> best regards
>>> Mail
>>>
>>
>> Any comments?
>
> Sorry for the late reply. Usually we respond pretty quickly but you
> caught us between Xen Developer Summit and Linaro Connect: most Xen
> hackers were traveling. In fact Julien Grall is still AFK and he
> is the one that knows the answer.
>
> I think that the 1:1 workaround in dom0 (that is having pseudo-physical
> addresses == physical addresses for dom0) should fix it. Give a look at

Actually it's not enough. The problem is because when the balloon driver 
will release a page, Xen will populate with a new allocated page. So it 
will break the 1:1 Workaround.
The commit eee34edcd1daecb70560dfe23009af2e65f7d26d on my tree in 
xenbits (git://xenbits.xen.org/people/julieng/xen-unstable.git) aims to 
fix this issue.
I will try to remember to update the wiki page monday when I will come 
back to the office.

Stefano: A couple of weeks ago, you told me you plan to rework this 
commit for the swiotlb, is it still relevant?

-- 
Julien Grall