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Re: [Xen-devel] pvops dom0 work roadmap

Konrad Rzeszutek Wilk writes:
 > On Thu, Aug 20, 2009 at 04:49:08PM +0100, Gianluca Guida wrote:
 > > Konrad Rzeszutek Wilk writes:
 > >  > I will retry this, but in the meantime I am tracking balloon accessing 
 > > non-existent pages:
 > > 
 > > Hm, what tree of dom0 kernel are you using? Is commit
 > [konrad@phenom linux]$ git checkout origin/rebase/master -b boo
 > Branch boo set up to track remote branch refs/remotes/origin/rebase/master.
 > Switched to a new branch 'boo'
 > [konrad@phenom linux]$ git show  7394b25905929a92e51771b832ee67b70ccebcf0
 > fatal: bad object 7394b25905929a92e51771b832ee67b70ccebcf0

Ok, you don't have the revert, do you have
a472909fe0e3b7bfa34f7c9dd748121b0ede0ee6 in your tree?

 > > 7394b25905929a92e51771b832ee67b70ccebcf0 (Revert "Xen: Allow guest to
 > > boot ballooned.") there?
 > What branch is it in?

rebase/master, checked in last week.

 > > 
 > > The point is that xen_memory_setup should truncate the ram visible in
 > > the e820 map to xen_start_info->nr_pages, so that the balloon driver
 > > would never try to add pages on boot.
 > Sure. This problem is for pages above ->nr_pages.

max_pfn is calculated by the e820 map, so there would be nothing above

I was assuming you had an up-to-date tree, where there's no "Allow
guest to boot ballooned" patch. When that patch is present no
truncation happens, and you get hit by that bug, which your patch


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