On Thu, Jun 20, 2013 at 08:14:45PM +0200, Borislav Petkov wrote: > On Thu, Jun 20, 2013 at 07:10:15PM +0100, Matthew Garrett wrote: > > Because Windows passes high addresses to SetVirtualAddressMap(), and > > because if you can imagine firmware developers getting it wrong then > > firmware developers will have got it wrong. > > Can we reversely assume that if we'd used fixed high offsets, as hpa > suggests, then it'll be fine? IOW, are any high addresses, even fixed > ones, fine? Windows actually seems to start at the top of address space and go down - this is what I get booting Windows 8 under kvm. It looks like very high addresses are fine, and we're currently using "low" high addresses, so I suspect we're fine pretty much anywhere in that range. ****** SetVirtualAddressMap Type: 5 Physical Start: 3E878000 Virtual Start: FFFFFFFFFFBEB000 Number Of Pages: 15 Attributes: 800000000000000F Type: 6 Physical Start: 3E88D000 Virtual Start: FFFFFFFFFFBD6000 Number Of Pages: 15 Attributes: 800000000000000F Type: 5 Physical Start: 3FB22000 Virtual Start: FFFFFFFFFFBA6000 Number Of Pages: 30 Attributes: 800000000000000F Type: 6 Physical Start: 3FB52000 Virtual Start: FFFFFFFFFFB82000 Number Of Pages: 24 Attributes: 800000000000000F Type: 6 Physical Start: 3FFE0000 Virtual Start: FFFFFFFFFFB62000 Number Of Pages: 20 -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- 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
