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| author | Nicholas Piggin <npiggin@gmail.com> | 2020-11-28 10:07:21 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-02 15:16:40 +0300 |
| commit | a1ee28117077c3bf24e5ab6324c835eaab629c45 (patch) | |
| tree | 1a82712492edccfd173aedab6080c9e90fac878a /arch/powerpc/platforms/powernv/setup.c | |
| parent | f54db39fbe40731c40aefdd3bc26e7d56d668c64 (diff) | |
| download | linux-a1ee28117077c3bf24e5ab6324c835eaab629c45.tar.xz | |
powerpc/64s/powernv: Fix memory corruption when saving SLB entries on MCE
This can be hit by an HPT guest running on an HPT host and bring down
the host, so it's quite important to fix.
Fixes: 7290f3b3d3e6 ("powerpc/64s/powernv: machine check dump SLB contents")
Cc: stable@vger.kernel.org # v5.4+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201128070728.825934-2-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/platforms/powernv/setup.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/setup.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c index 46115231a3b2..4426a109ec2f 100644 --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c @@ -211,11 +211,16 @@ static void __init pnv_init(void) add_preferred_console("hvc", 0, NULL); if (!radix_enabled()) { + size_t size = sizeof(struct slb_entry) * mmu_slb_size; int i; /* Allocate per cpu area to save old slb contents during MCE */ - for_each_possible_cpu(i) - paca_ptrs[i]->mce_faulty_slbs = memblock_alloc_node(mmu_slb_size, __alignof__(*paca_ptrs[i]->mce_faulty_slbs), cpu_to_node(i)); + for_each_possible_cpu(i) { + paca_ptrs[i]->mce_faulty_slbs = + memblock_alloc_node(size, + __alignof__(struct slb_entry), + cpu_to_node(i)); + } } } |