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powerpc/8xx: Copy kernel PGD entries into all PGDIRs

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In order to avoid having to select PGDIR at each TLB miss based on
fault address, copy kernel PGD entries into all PGDIRs in pgd_alloc().

At first it will be used for ITLB misses for kernel TEXT, then for
execmem then for kernel DATA.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/c6d2bf5af2ea909071a85bdca8b1f5dc2df134a8.1724173828.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2024-08-20 19:23:47 +02:00 committed by Michael Ellerman
parent 65a82e117f
commit 985db026c3
1 changed files with 7 additions and 1 deletions
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8
arch/powerpc/include/asm/nohash/pgalloc.h
View file

@ -19,8 +19,14 @@ static inline void tlb_flush_pgtable(struct mmu_gather *tlb,
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
pgd_t *pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
pgtable_gfp_flags(mm, GFP_KERNEL));
#ifdef CONFIG_PPC_8xx
memcpy(pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,
(MAX_PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
#endif
return pgd;
}
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)