On 05/28/14 at 08:40am, Vivek Goyal wrote: > On Wed, May 28, 2014 at 10:13:59AM +0800, Dave Young wrote: > > On 05/27/14 at 09:34am, Vivek Goyal wrote: > > > On Mon, May 26, 2014 at 04:39:35PM +0800, Dave Young wrote: > > > > > > > > For efi=old_map and any old_map quirks like SGI UV in current > > > > tree kexec/kdump will fail because it depends on the new 1:1 mapping. > > > > > > > > Thus export the mapping method to sysfs so kexec tools can switch > > > > to original way to boot. > > > > > > > > Since we have efi.flags for all efi facilities so let's just export the > > > > efi.flags itself, it maybe useful for other arches and use cases. > > > > > > > > > > Does it require any documentation in Documentation/ABI/.. > > > > Yes, it's necessary. Will do in next version. > > > > I'm still discussing with Matt, exporting efi.flags seems not a good way > > because they are more internal interfaces. > > > > Probably I should export only a file 'old_map' instead. > > How does /sys/firmware/efi/runtime-map/* look like with old mapping? Can't > we look at it and figure out if it is 1:1 or not. There's phys_addr and virt_addr, (virt_addr - phys_addr) will always be -64G for 1:1 map, ioremapped addresses space is different. So this is a good idea, we can do this way to avoid more ABI. Thanks Dave -- 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
