Thread (14 messages) 14 messages, 4 authors, 2020-12-10

Re: [PATCH 1/8] powerpc/64s/powernv: Fix memory corruption when saving SLB entries on MCE

From: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Date: 2020-11-30 03:57:39

On 2020-11-28 17:07:21 Sat, Nicholas Piggin wrote:
quoted hunk ↗ jump to hunk
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: 7290f3b3d3e66 ("powerpc/64s/powernv: machine check dump SLB contents")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/platforms/powernv/setup.c | 9 +++++++--
 1 file 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;
Acked-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>

Thanks,
-Mahesh.

 		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));
+		}
 	}
 }
 
-- 
2.23.0
-- 
Mahesh J Salgaonkar
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