powerpc/book3s64/keys/kuap: Reset AMR/IAMR values on kexec

Browse source

As we kexec across kernels that use AMR/IAMR for different purposes
we need to ensure that new kernels get kexec'd with a reset value
of AMR/IAMR. For ex: the new kernel can use key 0 for kernel mapping and the old
AMR value prevents access to key 0.

This patch also removes reset if IAMR and AMOR in kexec_sequence. Reset of AMOR
is not needed and the IAMR reset is partial (it doesn't do the reset
on secondary cpus) and is redundant with this patch.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709032946.881753-19-aneesh.kumar@linux.ibm.com

...

This commit is contained in:

Aneesh Kumar K.V 2020-07-09 08:59:41 +05:30 • committed by Michael Ellerman

parent 7cdd3745f2

commit 000a42b35a

5 changed files with 40 additions and 14 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

23

arch/powerpc/include/asm/book3s/64/kexec.h

View file

12

arch/powerpc/include/asm/kexec.h

View file

14

arch/powerpc/kernel/misc_64.S

View file

2

arch/powerpc/kexec/core_64.c

View file

3

arch/powerpc/mm/book3s64/pgtable.c

View file