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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] PV guest + shadow paging
Hi, At 19:01 +0800 on 22 Oct (1193079674), tgh wrote: > what is the auto_translated_physmap ? A shadow pagetable mode where Xen does the translation between guest-physical and machine-physical addresses for PV guests. Normally PV guests do that translation themselves, because it's faster, and Xen does it for HVM guests because they can't do it themseves. > how does it work? It doesn't, at least not in xen-unstable. As I said, I believe some research projects have it working in their own trees because it's useful for things like deterministic replay of guest execution. > and what about > other mechanisms and how many mechanisms for paging are there in xen ? Plenty. There are between two and eighteen shadow modes, depending on how you'd like to count them, hardware support for using two sets of pagetables at once, normal PV guest paging, writeable pagetables, grant tables for letting one guest see another guest's pages, and IOMMU support for paging DMA. Probably one or two more in there somewhere. Tim. -- Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, XenSource UK Limited Registered office c/o EC2Y 5EB, UK; company number 05334508 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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