>>> Ed White <edmund.h.wh...@intel.com> 01/13/15 10:32 PM >>> >On 01/13/2015 12:45 PM, Andrew Cooper wrote: >> On 13/01/15 20:02, Ed White wrote: >>> The set of mfn's is the same, but I do allow gfn->mfn mappings to be >>> modified under certain circumstances. One use of this is to point the >>> same VA to different physical pages (with different access permissions) >>> in different p2m's to hide memory changes. >> >> What is the practical use of being able to play paging tricks like this >> behind a VMs back? > >I'm restricted in how much detail I can go into on a public mailing list, >but imagine that you want a data read to see one thing and an instruction >fetch to see something else.
How would that work? There can only be one P2M in use at a time, and that's used for both translations. Or are you saying at least one of the two accesses would be emulated nevertheless? Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
