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

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

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).

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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