Messages in this thread | | | Date | Mon, 22 Oct 2007 11:37:49 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: Interaction between Xen and XFS: stray RW mappings |
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Nick Piggin wrote: > You could call it a bug I think. I don't know much about Xen though, > whether or not it expects to be able to run an arbitrary OS kernel. >
Xen's paravirtualized mode always requires a guest OS to be modified; certainly some operating systems would be very hard to make work with Xen. But you can always fall back to using shadow pagetables or full hvm (VT/SVM) mode.
> Presumably, the hypervisor _could_ write protect and trap writes to > *all* page table page mappings. >
Xen manages this stuff with refcounts; it doesn't maintain an rmap for these pages, so it would have to exhaustively search to do this. But aside from that, Xen never actively modifies pagetables, so this would be a new behaviour in the interface.
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