# git rev-parse -q --verify 21a741eb75f80397e5f7d3739e24d7d75e619011^{commit} 21a741eb75f80397e5f7d3739e24d7d75e619011 already have revision, skipping fetch # git checkout -q -f -B kisskb 21a741eb75f80397e5f7d3739e24d7d75e619011 # git clean -qxdf # < git log -1 # commit 21a741eb75f80397e5f7d3739e24d7d75e619011 # Author: Nicholas Piggin # Date: Tue Jun 25 23:40:47 2024 +1000 # # powerpc/pseries: Fix scv instruction crash with kexec # # 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: 7fa95f9adaee ("powerpc/64s: system call support for scv/rfscv instructions") # Cc: stable@vger.kernel.org # v5.9+ # Reported-by: Sourabh Jain # Closes: https://lore.kernel.org/3b4b2943-49ad-4619-b195-bc416f1d1409@linux.ibm.com # Signed-off-by: Nicholas Piggin # Tested-by: Gautam Menghani # Tested-by: Sourabh Jain # Link: https://msgid.link/20240625134047.298759-1-npiggin@gmail.com # Signed-off-by: Michael Ellerman # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 21a741eb75f80397e5f7d3739e24d7d75e619011 # make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_mpc836x_rdk_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 83xx/mpc836x_rdk_defconfig # < make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_mpc836x_rdk_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_mpc836x_rdk_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_mpc836x_rdk_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- Completed OK # rm -rf /kisskb/build/powerpc-fixes_83xx_mpc836x_rdk_defconfig_powerpc-gcc5 # Build took: 0:00:34.712732