# git rev-parse -q --verify ee8348496c77e3737d0a6cda307a521f2cff954f^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git fixes-test
# git rev-parse -q --verify ee8348496c77e3737d0a6cda307a521f2cff954f^{commit}
ee8348496c77e3737d0a6cda307a521f2cff954f
# git checkout -q -f -B kisskb ee8348496c77e3737d0a6cda307a521f2cff954f
# git clean -qxdf
# < git log -1
# commit ee8348496c77e3737d0a6cda307a521f2cff954f
# Author: Alexander Graf <graf@amazon.com>
# Date:   Tue May 10 14:37:17 2022 +0200
# 
#     KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context()
#     
#     Commit 863771a28e27 ("powerpc/32s: Convert switch_mmu_context() to C")
#     moved the switch_mmu_context() to C. While in principle a good idea, it
#     meant that the function now uses the stack. The stack is not accessible
#     from real mode though.
#     
#     So to keep calling the function, let's turn on MSR_DR while we call it.
#     That way, all pointer references to the stack are handled virtually.
#     
#     In addition, make sure to save/restore r12 on the stack, as it may get
#     clobbered by the C function.
#     
#     Fixes: 863771a28e27 ("powerpc/32s: Convert switch_mmu_context() to C")
#     Cc: stable@vger.kernel.org # v5.14+
#     Reported-by: Matt Evans <matt@ozlabs.org>
#     Signed-off-by: Alexander Graf <graf@amazon.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20220510123717.24508-1-graf@amazon.com
# < /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 ee8348496c77e3737d0a6cda307a521f2cff954f
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64le_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64le_defconfig
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64le_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64le_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64le_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_ppc64le_defconfig_powerpc-gcc5
# Build took: 0:01:17.931735