[BISECTED] kexec regression on PowerBook G4

[Christophe Leroy]

Le 23/05/2019 à 19:27, Aaro Koskinen a écrit :
> Hi,
> 
> 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.

Christophe