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Re: [Xen-devel] Issue with ARM: Network doesn't work in the guest

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@xxxxxxxxx>:
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@xxxxxxxxxx
Status: In progress
Description: Network doesn't work in the guest when an ehternet cable is
References: http://pastebin.com/gEP3HdCg

What's the latest status?

best regards

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

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