Re: [Xen-devel] [PATCH] xen/arm: Scrub heap pages during boot

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 01/10/2014 09:52 AM, Ian Campbell wrote:
> On Fri, 2014-01-10 at 03:27 +0000, Julien Grall wrote:
> > Scrub heap pages was disabled because it was slow on the models. Now that Xen
> > supports real hardware, it's possible to enable by default scrubbing.
> >
> > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Thanks.


> > ---
> >      This patch should go to Xen 4.4. It avoid to give non-cleared page to
> >      a domain.
> >
> >      The downside is it's now slow on models.
> There is a no-bootscrub command-line option which can be used in that
> case. Could you update the relevant model wiki pages to mention it
> please?
I have updated the wiki page.

> >      The current implementation of scrub_heap_pages loop on every page in the
> >      frametable. On ARM, there is only which can contains MMIO. We are safe
> >      because when frametable is initialized, page are marked inuse. So the
> >      function won't clear theses pages.
> I don't think this behaviour is specific to ARM, x86 has MMIO regions
> mixed in with RAM as well.
I was not sure, so I prefered to explain why it's ok.

--
Julien Grall

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