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xen-devel
Re: [Xen-devel] Re: Balloons, crash-dumps, populate-on-demand, and shar
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To: |
Paul Durrant <paul.durrant@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: Balloons, crash-dumps, populate-on-demand, and shared zero pages |
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From: |
George Dunlap <George.Dunlap@xxxxxxxxxxxxx> |
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Date: |
Thu, 20 Aug 2009 13:49:02 +0100 |
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Cc: |
Steven Smith <Steven.Smith@xxxxxxxxxxxxx>, Gianluca Guida <Gianluca.Guida@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx> |
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On Thu, Aug 20, 2009 at 11:56 AM, Paul Durrant<paul.durrant@xxxxxxxxxx> wrote:
> If the balloon driver deflated too far, that would be a bug in the balloon
> driver, and if Windows doesn't scrub the memory when it's freed we could do
> that ourselves so at least PoD would kill the guest at the right juncture.
But is it easier to scrub memory manually before freeing, or just make
a hypercall telling Xen to put zeroed pages there?
I think Steven's right... we may be introducing subtle latent bugs;
overall it doesn't sound like the benefit is worth the extra
complexity.
Steven, if we can make the PV drivers do something sensible wrt failed
writes during a crash, that might be the best solution.
-George
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