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powerpc/64s: Enable KFENCE on book3s64

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KFENCE support was added for ppc32 in commit 90cbac0e99
("powerpc: Enable KFENCE for PPC32").
Enable KFENCE on ppc64 architecture with hash and radix MMUs.
It uses the same mechanism as debug pagealloc to
protect/unprotect pages. All KFENCE kunit tests pass on both
MMUs.

KFENCE memory is initially allocated using memblock but is
later marked as SLAB allocated. This necessitates the change
to __pud_free to ensure that the KFENCE pages are freed
appropriately.

Based on previous work by Christophe Leroy and Jordan Niethe.

Signed-off-by: Nicholas Miehlbradt <nicholas@linux.ibm.com>
Reviewed-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926075726.2846-4-nicholas@linux.ibm.com
This commit is contained in:
Nicholas Miehlbradt
2022-09-26 07:57:26 +00:00
committed by Michael Ellerman
parent d7902d31cb
commit a5edf9815d
6 changed files with 30 additions and 11 deletions
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2
arch/powerpc/include/asm/book3s/64/pgtable.h
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@@ -1106,7 +1106,7 @@ static inline void vmemmap_remove_mapping(unsigned long start,
}
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
static inline void __kernel_map_pages(struct page *page, int numpages, int enable)
{
if (radix_enabled())