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





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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