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

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 11/11/2013 01:13 PM, Stefano Stabellini wrote:
> On Thu, 7 Nov 2013, Julien Grall wrote:
> > 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
> > > > > 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?
> After looking at this a bit more, I think that your workaround is
> reasonable and less fragile than my original idea based on modifying the
> Linux balloon driver. I think that it just needs to be cleaned a bit,
> see appended comments.
Thanks. I will rework the patch and send it soon.

--
Julien Grall

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