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LoongArch: Make KASAN work with 5-level page-tables

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Make KASAN work with 5-level page-tables, including:
1. Implement and use __pgd_none() and kasan_p4d_offset().
2. As done in kasan_pmd_populate() and kasan_pte_populate(), restrict
   the loop conditions of kasan_p4d_populate() and kasan_pud_populate()
   to avoid unnecessary population.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2024-11-12 16:35:39 +08:00
parent c859900a84
commit a410656643
1 changed files with 23 additions and 3 deletions
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26
arch/loongarch/mm/kasan_init.c
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@ -13,6 +13,13 @@
static pgd_t kasan_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
#ifdef __PAGETABLE_P4D_FOLDED
#define __pgd_none(early, pgd) (0)
#else
#define __pgd_none(early, pgd) (early ? (pgd_val(pgd) == 0) : \
(__pa(pgd_val(pgd)) == (unsigned long)__pa(kasan_early_shadow_p4d)))
#endif
#ifdef __PAGETABLE_PUD_FOLDED
#define __p4d_none(early, p4d) (0)
#else
@ -142,6 +149,19 @@ static pud_t *__init kasan_pud_offset(p4d_t *p4dp, unsigned long addr, int node,
return pud_offset(p4dp, addr);
}
static p4d_t *__init kasan_p4d_offset(pgd_t *pgdp, unsigned long addr, int node, bool early)
{
if (__pgd_none(early, pgdp_get(pgdp))) {
phys_addr_t p4d_phys = early ?
__pa_symbol(kasan_early_shadow_p4d) : kasan_alloc_zeroed_page(node);
if (!early)
memcpy(__va(p4d_phys), kasan_early_shadow_p4d, sizeof(kasan_early_shadow_p4d));
pgd_populate(&init_mm, pgdp, (p4d_t *)__va(p4d_phys));
}
return p4d_offset(pgdp, addr);
}
static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr,
unsigned long end, int node, bool early)
{
@ -178,19 +198,19 @@ static void __init kasan_pud_populate(p4d_t *p4dp, unsigned long addr,
do {
next = pud_addr_end(addr, end);
kasan_pmd_populate(pudp, addr, next, node, early);
} while (pudp++, addr = next, addr != end);
} while (pudp++, addr = next, addr != end && __pud_none(early, READ_ONCE(*pudp)));
}
static void __init kasan_p4d_populate(pgd_t *pgdp, unsigned long addr,
unsigned long end, int node, bool early)
{
unsigned long next;
p4d_t *p4dp = p4d_offset(pgdp, addr);
p4d_t *p4dp = kasan_p4d_offset(pgdp, addr, node, early);
do {
next = p4d_addr_end(addr, end);
kasan_pud_populate(p4dp, addr, next, node, early);
} while (p4dp++, addr = next, addr != end);
} while (p4dp++, addr = next, addr != end && __p4d_none(early, READ_ONCE(*p4dp)));
}
static void __init kasan_pgd_populate(unsigned long addr, unsigned long end,