On Tue, Dec 18, 2018 at 09:18:42AM +0000, Christophe Leroy wrote: > The only difference I see then are the flags. Everything else is seems > identical. > > I know you tried already, but would you mind trying once more with the > following change ? > [...] > - setbat(idx, PAGE_OFFSET + base, base, size, PAGE_KERNEL_TEXT); > + setbat(idx, PAGE_OFFSET + base, base, size, PAGE_KERNEL_X);
Good call, with this workaround on top of patches 1-3, it boots again: # mount -t debugfs d /sys/kernel/debug # cat /sys/kernel/debug/powerpc/block_address_translation ---[ Instruction Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 Kernel EXEC 1: - 2: 0xc1000000-0xc17fffff 0x01000000 Kernel EXEC 3: - 4: 0xd0000000-0xd1ffffff 0x10000000 Kernel EXEC 5: - 6: - 7: - ---[ Data Block Address Translation ]--- 0: 0xc0000000-0xc0ffffff 0x00000000 Kernel RW 1: 0xfffe0000-0xffffffff 0x0d000000 Kernel RW no cache guarded 2: 0xc1000000-0xc17fffff 0x01000000 Kernel RW 3: - 4: 0xd0000000-0xd1ffffff 0x10000000 Kernel RW 5: - 6: - 7: - > I think we may have some code trying to modify the kernel text without using > code patching functions. Is there any faster way than to sprinkle some printks in setup_kernel and try to find the guilty piece of code this way? Jonathan
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