On Wed, Oct 14, 2015 at 05:19:40PM +0200, Ingo Molnar wrote: > > * Josh Triplett <j...@joshtriplett.org> wrote: > > > On Mon, Oct 12, 2015 at 04:17:54PM +0200, Ingo Molnar wrote: > > > * Matt Fleming <m...@codeblueprint.co.uk> wrote: > > > > On Mon, 12 Oct, at 02:49:36PM, Ingo Molnar wrote: > > > > > So why not unmap them after bootup? Is there any reason to call into > > > > > EFI code > > > > > while the system is up and running? > > > > > > > > That's where the runtime services code lives. So if you want things > > > > like EFI > > > > variables (used by the distro installer, among other things) you need > > > > to map the > > > > runtime regions. > > > > > > So EFI variables could be queried during bootup and saved on the Linux > > > side. > > > > That wouldn't support writing to EFI variables. Or using the EFI > > capsule update system to update firmware. > > Well, if we know the location of those pages then we could map those 'rw-' - > while > the rest would be mapped 'r-x'.
We have no way to do so in the absence of the additional code/data separation information provided by more recent firmware. - Josh Triplett -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
