Re: [Xen-devel] Seamlessly sharing identical memory pages among domains

[Kip Macy <kmacy@xxxxxxxxxxx>]

>
> Doing a proper shared cache is slightly trickier given the
> paravirtualised memory interface -- we'd have to introduce guests
> to a new kind of write fault: "A write fault has occurred, and
> you'll have to copy the page because this machine page is
> immutable as it is already shared with other domains". Modifying
> Linux to handle this wouldn't be hard.

Would this just involve adding an extra error code to what x86 already
uses and then modifying the guest to understand that that error code
means that the page has to be COWed?


                                -Kip


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