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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: 7290f3b3d3 ("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
This commit is contained in:
Nicholas Piggin 2020-11-28 17:07:21 +10:00 committed by Michael Ellerman
parent f54db39fbe
commit a1ee281170
1 changed files with 7 additions and 2 deletions
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9
arch/powerpc/platforms/powernv/setup.c
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@ -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));
}
}
}