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[Xen-devel] Re: scrubbing pages on vm pause

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: scrubbing pages on vm pause
From: Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 25 May 2010 16:24:34 +0200
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
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On 05/25/2010 04:19 PM, Keir Fraser wrote:
> On 25/05/2010 15:19, "Joanna Rutkowska" <joanna@xxxxxxxxxxxxxxxxxxxxxx>
> wrote:
>> Let's consider this scenario:
>> xm save domain1
>> xm create domain2
>> Can the domain2 get *unscrubbed* pages that were previously used by
>> domain1, but were not scrubbed properly by domain1?
> Generally speaking a domain loses pages to the free pool in only two ways:
> via a decrease_reservation hypercall, and via domain destruction. In the
> former case the domain itself is responsible for first scrubbing the page.
> In the latter case Xen is responsible. With both avenues covered, domain2
> cannot get unscrubbed pages from domain1.
Makes sense.


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