Nicholas Piggin c550679d60 powerpc/pseries: Fix scv instruction crash with kexec ... commit 21a741eb75 upstream. kexec on pseries disables AIL (reloc_on_exc), required for scv instruction support, before other CPUs have been shut down. This means they can execute scv instructions after AIL is disabled, which causes an interrupt at an unexpected entry location that crashes the kernel. Change the kexec sequence to disable AIL after other CPUs have been brought down. As a refresher, the real-mode scv interrupt vector is 0x17000, and the fixed-location head code probably couldn't easily deal with implementing such high addresses so it was just decided not to support that interrupt at all. Fixes: 7fa95f9ada ("powerpc/64s: system call support for scv/rfscv instructions") Cc: stable@vger.kernel.org # v5.9+ Reported-by: Sourabh Jain <sourabhjain@linux.ibm.com> Closes: https://lore.kernel.org/3b4b2943-49ad-4619-b195-bc416f1d1409@linux.ibm.com Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Tested-by: Gautam Menghani <gautam@linux.ibm.com> Tested-by: Sourabh Jain <sourabhjain@linux.ibm.com> Link: https://msgid.link/20240625134047.298759-1-npiggin@gmail.com Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-07-11 12:47:15 +02:00
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core.c	powerpc/64/kdump: Limit kdump base to 512MB	2022-09-28 19:22:09 +10:00
core_32.c	powerpc: Remove CONFIG_FSL_BOOKE	2022-09-26 22:47:37 +10:00
core_64.c	powerpc/pseries: Fix scv instruction crash with kexec	2024-07-11 12:47:15 +02:00
crash.c	powerpc/crash: save cpu register data in crash_smp_send_stop()	2022-07-28 16:22:13 +10:00
elf_64.c	powerpc: If kexec_build_elf_info() fails return immediately from elf64_load()	2021-04-26 16:28:26 -05:00
file_load.c	powerpc: Delete unused function delete_fdt_mem_rsv()	2021-03-08 12:06:30 -07:00
file_load_64.c	powerpc/kexec: Fix build failure from uninitialised variable	2022-08-10 15:55:20 +10:00
Makefile	powerpc/kasan: Disable address sanitization in kexec paths	2022-05-22 15:58:29 +10:00
ranges.c	powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU	2021-12-09 22:41:13 +11:00
relocate_32.S	powerpc: Remove CONFIG_FSL_BOOKE	2022-09-26 22:47:37 +10:00