[Xen-devel] RE: touching a missing page causes DomU to die

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: 21 January 2011 12:35
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] touching a missing page causes DomU to die
> 
> My Windows PV drivers are crashing during hibernation, and I've
> finally
> figured out that it's because the windows hibernation mode driver
> double
> buffers memory before handing it to my block device driver, and in
> doing
> so 'touches' some pages of memory I have given back to xen (to work
> around a domu save crash).
> 

You've given memory belonging to the crash kernel back to Xen?

> I assume that this is the same issue that causes touching
> unpopulated
> PoD memory to blow up the DomU too.
> 
> I don't know if there is a way to mark the pages I gave back to xen
> as
> 'gone' under windows, the best I can do is allocate them to my
> driver...
> any suggestions as to how to resolve it from xen? One idea I had was
> to
> map the same physical page of memory into the 'holes' so things at
> least
> don't blow up, but I'm not sure if that is possible or desirable.
> 
> Thanks
> 
> James
> 
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