linux-kernel - Re: [Xen-devel] Re: [PATCH v4 2/2] xen: modify kernel mappings corresponding to granted pages

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Date:	Thu, 29 Sep 2011 11:00:38 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] Re: [PATCH v4 2/2] xen: modify kernel mappings
 corresponding to granted pages

On Thu, 29 Sep 2011, Konrad Rzeszutek Wilk wrote:
> > > > But aren't that 'range of virtual address' of struct pages? You
> > > > are using 'alloc_xenballooned_pages' to get those pages and that is
> > > > what the 'range of virtual adresses' is walking through.
> > > 
> > > it is not the same range of virtual addresses
> > 
> > OK, but the pte_maddr is the same, isn't it?
> 
> No it is not. It is the machine address of the PTE entry that
> points to the 'struct page' (kernel linear address), while the
> find_grant_pte's gets the machine address of the PTE entry that
> points to the user pages. Completlely different machine addresses
> of the PTEs.

Right


> Can you add a comment to the patch saying something along what
> I just said? Just in case somebody is as thick as I am when looking
> at this code/patch.

Sure


> Otherwise the patch looks fine - just fix up the SetPagePrivate,
> the PAGE_GRANT bit, and add extra comments and I am ready to stick it
> on my queue.

OK!
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