[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] guest physical to xen machine copy?
You can try gfn_to_mfn... Thanks, Kevin >From: Dan Magenheimer >Sent: 2008年9月28日 5:33 > >Sorry for my poor x86 memory model knowlege... > >In some code I am working on, I currently pass the >address of a guest page from a domain via a hypercall >and in Xen either copy to or from the guest page >using: > >__copy_from_guest(xen_va, guest_va, PAGE_SIZE) > >or > >__copy_to_guest(guest_va, xen_va, PAGE_SIZE) > >where guest_va is declared as a XEN_GUEST_HANDLE(void) > >Now I'd like to switch the hypercall interface so >that the domain passes a guest physical address >(or guest physical frame number) instead of a guest >virtual address. > >I see code that does get_gpfn_from_mfn() but not >the opposite. What do I need to do to copy a >page of data from a guest pfn to a Xen mfn (or >vice versa)? And is a guest physical address >still referenced as a XEN_GUEST_HANDLE? > >It's probably very simple but I can't find it... > >Thanks, >Dan > >P.S. This has to work on 32- or 64-bit guests to >both 32- and 64-bit hypervisors. > >_______________________________________________ >Xen-devel mailing list >Xen-devel@xxxxxxxxxxxxxxxxxxx >http://lists.xensource.com/xen-devel > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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