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powerpc/64s/powernv: Fix memory corruption when saving SLB entries on MCE 

commit a1ee28117077c3bf24e5ab6324c835eaab629c45 upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicholas Piggin 2020-11-28 17:07:21 +10:00 committed by Greg Kroah-Hartman
parent 8a758e97b7
commit 6466119452
1 changed files with 7 additions and 2 deletions
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9
arch/powerpc/platforms/powernv/setup.c
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@ -186,11 +186,16 @@ 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));
}
}
}