| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
[Xen-devel] Re: Xen MMU's requirement to pin pages RO and initial_memory
|
To: |
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> |
|
Subject: |
[Xen-devel] Re: Xen MMU's requirement to pin pages RO and initial_memory_mapping. |
|
From: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
|
Date: |
Tue, 17 May 2011 14:17:16 -0400 |
|
Cc: |
"jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "hpa@xxxxxxxxxxxxxxx" <hpa@xxxxxxxxxxxxxxx>, "yinghai@xxxxxxxxxx" <yinghai@xxxxxxxxxx> |
|
Delivery-date: |
Tue, 17 May 2011 11:18:44 -0700 |
|
Envelope-to: |
www-data@xxxxxxxxxxxxxxxxxxx |
|
In-reply-to: |
<20110517180520.GC13706@xxxxxxxxxxxx> |
|
List-help: |
<mailto:xen-devel-request@lists.xensource.com?subject=help> |
|
List-id: |
Xen developer discussion <xen-devel.lists.xensource.com> |
|
List-post: |
<mailto:xen-devel@lists.xensource.com> |
|
List-subscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
|
List-unsubscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
|
References: |
<20110513153010.GB16519@xxxxxxxxxxxx> <alpine.DEB.2.00.1105131650550.8972@kaball-desktop> <20110516154132.GA12486@xxxxxxxxxxxx> <alpine.DEB.2.00.1105171745300.12963@kaball-desktop> <20110517180520.GC13706@xxxxxxxxxxxx> |
|
Sender: |
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
|
User-agent: |
Mutt/1.5.21 (2010-09-15) |
> > xen_alloc_pte_init and xen_alloc_pmd_init are the ones that mark the
> > pagetable pages RO and pin them, calling make_lowmem_page_readonly and
> > pin_pagetable_pfn.
> >
> > alloc_pte/pmd are called right before hooking them into the pagetable;
> > unfortunately that means that they fail at marking the pagetable pages
> > RO: make_lowmem_page_readonly uses lookup_address to find the pte
> > corresponding to a page, however at this point the pagetable pages are
> > not mapped yet (usually they are not hooked but when they are hooked, the
> > upper level pagetable page is not hooked), so lookup_address fails.
>
> Right. We don't have to walk the hooked pagetable, I think. We are passed
> in the PMD/PGD of the PFN and we could look at the content of that PFN.
err, got that backwards. "passed in the PFN of the PMD/PGD".
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home