# git rev-parse -q --verify ee8348496c77e3737d0a6cda307a521f2cff954f^{commit} ee8348496c77e3737d0a6cda307a521f2cff954f already have revision, skipping fetch # git checkout -q -f -B kisskb ee8348496c77e3737d0a6cda307a521f2cff954f # git clean -qxdf # < git log -1 # commit ee8348496c77e3737d0a6cda307a521f2cff954f # Author: Alexander Graf # 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 # Signed-off-by: Alexander Graf # Signed-off-by: Michael Ellerman # Link: https://lore.kernel.org/r/20220510123717.24508-1-graf@amazon.com # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 ee8348496c77e3737d0a6cda307a521f2cff954f # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_skiroot_defconfig_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- skiroot_defconfig # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_skiroot_defconfig_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_skiroot_defconfig_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_skiroot_defconfig_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- In file included from /kisskb/src/include/linux/byteorder/little_endian.h:5, from /kisskb/src/arch/powerpc/include/uapi/asm/byteorder.h:12, from /kisskb/src/include/asm-generic/bitops/le.h:6, from /kisskb/src/arch/powerpc/include/asm/bitops.h:336, from /kisskb/src/include/linux/bitops.h:33, from /kisskb/src/include/linux/kernel.h:22, from /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:46: /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c: In function '_base_make_ioc_operational': /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5396:40: warning: array subscript 'Mpi2SasIOUnitPage1_t {aka struct _MPI2_CONFIG_PAGE_SASIOUNIT_1}[0]' is partly outside array bounds of 'unsigned char[20]' [-Warray-bounds] 5396 | (le16_to_cpu(sas_iounit_pg1->SASWideMaxQueueDepth)) ? /kisskb/src/include/uapi/linux/byteorder/little_endian.h:37:51: note: in definition of macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) | ^ /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5396:14: note: in expansion of macro 'le16_to_cpu' 5396 | (le16_to_cpu(sas_iounit_pg1->SASWideMaxQueueDepth)) ? | ^~~~~~~~~~~ /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5382:26: note: referencing an object of size 20 allocated by 'kzalloc' 5382 | sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL); | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from /kisskb/src/include/linux/byteorder/little_endian.h:5, from /kisskb/src/arch/powerpc/include/uapi/asm/byteorder.h:12, from /kisskb/src/include/asm-generic/bitops/le.h:6, from /kisskb/src/arch/powerpc/include/asm/bitops.h:336, from /kisskb/src/include/linux/bitops.h:33, from /kisskb/src/include/linux/kernel.h:22, from /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:46: /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5400:40: warning: array subscript 'Mpi2SasIOUnitPage1_t {aka struct _MPI2_CONFIG_PAGE_SASIOUNIT_1}[0]' is partly outside array bounds of 'unsigned char[20]' [-Warray-bounds] 5400 | (le16_to_cpu(sas_iounit_pg1->SASNarrowMaxQueueDepth)) ? /kisskb/src/include/uapi/linux/byteorder/little_endian.h:37:51: note: in definition of macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) | ^ /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5400:14: note: in expansion of macro 'le16_to_cpu' 5400 | (le16_to_cpu(sas_iounit_pg1->SASNarrowMaxQueueDepth)) ? | ^~~~~~~~~~~ /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5382:26: note: referencing an object of size 20 allocated by 'kzalloc' 5382 | sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL); | ^~~~~~~~~~~~~~~~~~~~~~~ /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5403:43: warning: array subscript 'Mpi2SasIOUnitPage1_t {aka struct _MPI2_CONFIG_PAGE_SASIOUNIT_1}[0]' is partly outside array bounds of 'unsigned char[20]' [-Warray-bounds] 5403 | ioc->max_sata_qd = (sas_iounit_pg1->SATAMaxQDepth) ? | ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ /kisskb/src/drivers/scsi/mpt3sas/mpt3sas_base.c:5382:26: note: referencing an object of size 20 allocated by 'kzalloc' 5382 | sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL); | ^~~~~~~~~~~~~~~~~~~~~~~ Completed OK # rm -rf /kisskb/build/powerpc-fixes_skiroot_defconfig_powerpc-gcc11 # Build took: 0:01:32.557219