linux-kernel - [PATCH 0/3] xtensa: allow handling protection faults in noMMU

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Message-Id: <20220413234930.1212335-1-jcmvbkbc@gmail.com>
Date:   Wed, 13 Apr 2022 16:49:27 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-xtensa@...ux-xtensa.org
Cc:     Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH 0/3] xtensa: allow handling protection faults in noMMU

Hello,

most xtensa cores have some sort of memory protection mechanism, even
those without full MMU. This series separates protection fault handling
from the CONFIG_MMU setting and allows noMMU configurations to also
do it. This improves userspace behavior in case of errors such as
passing NULL pointer to a syscall that expects a valid memory pointer:
instead of killing the process the kernel is now able to return -EINVAL
from a syscall.

Max Filippov (3):
  xtensa: move asid_cache from fault.c to mmu.c
  xtensa: extract vmalloc_fault code into a function
  xtensa: noMMU: allow handling protection faults

 arch/xtensa/Kconfig        |  11 ++++
 arch/xtensa/kernel/traps.c |  20 +++----
 arch/xtensa/mm/Makefile    |   3 +-
 arch/xtensa/mm/fault.c     | 112 +++++++++++++++++++------------------
 arch/xtensa/mm/mmu.c       |   2 +
 5 files changed, 83 insertions(+), 65 deletions(-)

-- 
2.30.2