From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joanna Rutkowska <joanna@invisiblethingslab.com>
Subject: Re: scrubbing pages on vm pause
Date: Tue, 25 May 2010 16:24:34 +0200
Message-ID: <4BFBDDA2.6010609@invisiblethingslab.com>
References: <C8219B17.1542C%keir.fraser@eu.citrix.com>
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To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Rafal Wojtczuk <rafal@invisiblethingslab.com>
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On 05/25/2010 04:19 PM, Keir Fraser wrote:
> On 25/05/2010 15:19, "Joanna Rutkowska" <joanna@invisiblethingslab.com>=

> wrote:
>=20
>> 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?
>=20
> Generally speaking a domain loses pages to the free pool in only two wa=
ys:
> via a decrease_reservation hypercall, and via domain destruction. In th=
e
> former case the domain itself is responsible for first scrubbing the pa=
ge.
> In the latter case Xen is responsible. With both avenues covered, domai=
n2
> cannot get unscrubbed pages from domain1.
>=20
Makes sense.

Thanks,
j.


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