On Fri, Nov 03, 2006 at 05:51:03PM +0100, Andi Kleen wrote: > > [Finally dropping that annoying fastboot list from cc. Please never include > any closed > mailing lists in l-k posts. Thanks] > > > That won't worked because in arch/86_64/kernel/e820.c, the exactmap > > parsing clobbers end_pfn_map. > > That's a bug imho. It shouldn't do that. > > end_pfn_map should be always the highest address in e820 so that we > can access all firmware tables safely. >
Hi Andi, end_pfn_map still contins the highest address in e820. The only difference is that it is reset and recalculated based on new memory map passed with the help of memmap= options. Actually with mempmap=exactmap, we are overriding the BIOS provided memory map with a User defined memory map so we reset the end_pfn_map to zero and it will be calculated again based on new memory map passed with the help of memmap= options. So to access all the firmware tables safely, one has to make sure that right memmap= options have been passed to the kernel. That's why IMHO, the right way to fix this problem is not doing some special condition checks in kernel, instead, passing the right memmap= options. To do that kexec-tools has to know where the firmware tables are and that's why location of MP tables should be exported to user space. Thanks Vivek _______________________________________________ fastboot mailing list [email protected] https://lists.osdl.org/mailman/listinfo/fastboot
