Hi, On Thu, May 23, 2019 at 08:58:11PM +0200, Christophe Leroy wrote: > Le 23/05/2019 à 19:27, Aaro Koskinen a écrit : > >On Thu, May 23, 2019 at 07:33:38AM +0200, Christophe Leroy wrote: > >>Ok, the Oops confirms that the error is due to executing the kexec control > >>code which is located outside the kernel text area. > >> > >>My yesterday's proposed change doesn't work because on book3S/32, NX > >>protection is based on setting segments to NX, and using IBATs for kernel > >>text. > >> > >>Can you try the patch I sent out a few minutes ago ? > >>(https://patchwork.ozlabs.org/patch/1103827/) > > > >It now crashes with "BUG: Unable to handle kernel instruction fetch" > >and the faulting address is 0xef13a000. > > Ok. > > Can you try with both changes at the same time, ie the mtsrin(...) and the > change_page_attr() ? > > I suspect that allthough the HW is not able to check EXEC flag, the SW will > check it before loading the hash entry.
Unfortunately still no luck... The crash is pretty much the same with both changes. A.
