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12f363511d
linux-next/arch/powerpc/mm
History
Christophe Leroy 12f363511d powerpc/32s: Fix BATs setting with CONFIG_STRICT_KERNEL_RWX 
Serge reported some crashes with CONFIG_STRICT_KERNEL_RWX enabled
on a book3s32 machine.

Analysis shows two issues:
  - BATs addresses and sizes are not properly aligned.
  - There is a gap between the last address covered by BATs and the
    first address covered by pages.

Memory mapped with DBATs:
0: 0xc0000000-0xc07fffff 0x00000000 Kernel RO coherent
1: 0xc0800000-0xc0bfffff 0x00800000 Kernel RO coherent
2: 0xc0c00000-0xc13fffff 0x00c00000 Kernel RW coherent
3: 0xc1400000-0xc23fffff 0x01400000 Kernel RW coherent
4: 0xc2400000-0xc43fffff 0x02400000 Kernel RW coherent
5: 0xc4400000-0xc83fffff 0x04400000 Kernel RW coherent
6: 0xc8400000-0xd03fffff 0x08400000 Kernel RW coherent
7: 0xd0400000-0xe03fffff 0x10400000 Kernel RW coherent

Memory mapped with pages:
0xe1000000-0xefffffff  0x21000000       240M        rw       present           dirty  accessed

This patch fixes both issues. With the patch, we get the following
which is as expected:

Memory mapped with DBATs:
0: 0xc0000000-0xc07fffff 0x00000000 Kernel RO coherent
1: 0xc0800000-0xc0bfffff 0x00800000 Kernel RO coherent
2: 0xc0c00000-0xc0ffffff 0x00c00000 Kernel RW coherent
3: 0xc1000000-0xc1ffffff 0x01000000 Kernel RW coherent
4: 0xc2000000-0xc3ffffff 0x02000000 Kernel RW coherent
5: 0xc4000000-0xc7ffffff 0x04000000 Kernel RW coherent
6: 0xc8000000-0xcfffffff 0x08000000 Kernel RW coherent
7: 0xd0000000-0xdfffffff 0x10000000 Kernel RW coherent

Memory mapped with pages:
0xe0000000-0xefffffff  0x20000000       256M        rw       present           dirty  accessed

Fixes: 63b2bc6195 ("powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX")
Reported-by: Serge Belyshev <belyshev@depni.sinp.msu.ru>
Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-02 15:33:46 +10:00
..
ptdump powerpc/mm: Check secondary hash page table 2019-03-02 14:43:05 +11:00
8xx_mmu.c powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
40x_mmu.c powerpc/mm/32: add base address to mmu_mapin_ram() 2019-02-23 21:04:31 +11:00
44x_mmu.c powerpc/mm/32: add base address to mmu_mapin_ram() 2019-02-23 21:04:31 +11:00
copro_fault.c mm: convert return type of handle_mm_fault() caller to vm_fault_t 2018-08-17 16:20:28 -07:00
dma-noncoherent.c powerpc/dma: use the generic direct mapping bypass 2019-02-18 22:41:04 +11:00
drmem.c powerpc/mm/drmem: Fix unexpected flag value in ibm,dynamic-memory-v2 2018-02-23 16:45:51 +11:00
fault.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
fsl_booke_mmu.c powerpc/mm/32: add base address to mmu_mapin_ram() 2019-02-23 21:04:31 +11:00
hash64_4k.c powerpc/mm/hash: Remove the superfluous bitwise operation when find hpte group 2018-07-24 22:03:17 +10:00
hash64_64k.c powerpc/mm/hash: Remove the superfluous bitwise operation when find hpte group 2018-07-24 22:03:17 +10:00
hash_low_32.S powerpc/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32 2019-03-19 00:30:19 +11:00
hash_native_64.c powerpc/64s/hash: Do not use PPC_INVALIDATE_ERAT on CPUs before POWER9 2018-10-04 23:16:53 +10:00
hash_utils_64.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
highmem.c powerpc/mm: remove warning about ‘type’ being set 2018-08-10 22:12:38 +10:00
hugepage-hash64.c arch/powerpc/mm/hash: validate the pte entries before handling the hash fault 2018-10-03 15:39:59 +10:00
hugetlbpage-book3e.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hugetlbpage-hash64.c powerpc updates for 5.1 2019-03-07 12:56:26 -08:00
hugetlbpage-radix.c powerpc updates for 5.1 2019-03-07 12:56:26 -08:00
hugetlbpage.c powerpc updates for 4.21 2018-12-27 10:43:24 -08:00
init_32.c powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
init_64.c powerpc/mm: fix "section_base" set but not used 2019-03-02 14:43:05 +11:00
init-common.c powerpc/mm: remove unnecessary test in pgtable_cache_init() 2018-12-04 19:45:01 +11:00
Makefile powerpc/mm: Disable kcov for SLB routines 2019-03-12 14:06:12 +11:00
mem.c Merge branch 'topic/dma' into next 2019-02-21 23:15:10 +11:00
mmap.c exec: pass stack rlimit into mm layout functions 2018-04-11 10:28:37 -07:00
mmu_context_book3s64.c powerpc/mm: Move pte_fragment_alloc() to a common location 2018-12-04 19:45:01 +11:00
mmu_context_hash32.c powerpc: remove unnecessary inclusion of asm/tlbflush.h 2018-07-30 22:48:20 +10:00
mmu_context_iommu.c powerpc/mm_iommu: Allow pinning large regions 2019-04-17 21:36:51 +10:00
mmu_context_nohash.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
mmu_context.c powerpc/mm: Extend pte_fragment functionality to PPC32 2018-12-04 19:45:01 +11:00
mmu_decl.h powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
numa.c memblock: memblock_phys_alloc_try_nid(): don't panic 2019-03-12 10:04:01 -07:00
pgtable_32.c powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX 2019-02-23 21:04:32 +11:00
pgtable_64.c powerpc/mm: use pte helpers in generic code 2018-10-14 18:04:09 +11:00
pgtable-book3e.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pgtable-book3s64.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pgtable-frag.c mm: treewide: remove unused address argument from pte_alloc functions 2019-01-04 13:13:47 -08:00
pgtable-hash64.c powerpc: handover page flags with a pgprot_t parameter 2018-10-14 18:04:09 +11:00
pgtable-radix.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
pgtable.c powerpc/mm: add exec protection on powerpc 603 2018-12-19 18:56:32 +11:00
pkeys.c powerpc/pkeys: Fix handling of pkey state across fork() 2018-12-21 14:46:50 +11:00
ppc_mmu_32.c powerpc/32s: Fix BATs setting with CONFIG_STRICT_KERNEL_RWX 2019-05-02 15:33:46 +10:00
slb.c powerpc/64s/hash: Fix assert_slb_presence() use of the slbfee. instruction 2019-02-22 00:10:14 +11:00
slice.c powerpc/mm/hash: Handle mmap_min_addr correctly in get_unmapped_area topdown search 2019-02-26 16:26:29 +11:00
subpage-prot.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
tlb_hash32.c powerpc/sparse: Fix plain integer as NULL pointer warning 2018-05-25 12:04:38 +10:00
tlb_hash64.c powerpc/mm: Add support for handling > 512TB address in SLB miss 2018-03-31 00:10:38 +11:00
tlb_low_64e.S powerpc/fsl: Flush the branch predictor at each kernel entry (64bit) 2018-12-20 22:59:03 +11:00
tlb_nohash_low.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
tlb_nohash.c powerpc: remove unnecessary unlikely() 2019-01-15 11:38:05 +11:00
tlb-radix.c powerpc updates for 4.20 2018-10-26 14:36:21 -07:00
vphn.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vphn.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00