On Mon, 2013-06-03 at 10:11 +0200, Borislav Petkov wrote: > On Sun, Jun 02, 2013 at 11:56:20PM +0100, Matthew Garrett wrote: > > I've just run Windows 8 under a hacked up copy of OVMF that dumps > > the data passed to SetVirtualAddressMap. It seems that Windows *is* > > mapping the runtime services to higher addresses - so presumably the > > 1:1 mapping is in addition to the virtual mapping. > > But but, once we call SetVirtualAddressMap with the set of addresses of > the runtime services, only those can be used after, right? If so, we > can't have both (this is at least my understanding)... That's correct. I think not calling SetVirtualAddressMap() and just using a 1:1 mapping is far safer (having looked at what tianocore does for SetVirtualAddressMap()). The chances are that all the UEFI bioses are only tested with windows, so the pointer chases it has to do to switch address maps only work with the operations windows does. James -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
