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powerpc/603: Copy kernel PGD entries into all PGDIRs and preallocate execmem page tables

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For the same reason as 8xx, copy kernel PGD entries into all
PGDIRs in pgd_alloc() and preallocate execmem page tables before
creating new PGDs so that all PGD entries related to execmem are
copied by pgd_alloc().

This will help reduce the fast-path in TLBmiss handlers.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/1a0d1feee07c4cf955f6a43a704c203e5c90fa53.1724173828.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2024-08-20 19:23:55 +02:00 committed by Michael Ellerman
parent 2f2b9a3adc
commit 82ef440f9a
2 changed files with 2 additions and 2 deletions
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2
arch/powerpc/include/asm/nohash/pgalloc.h
View File

@ -22,7 +22,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
pgd_t *pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
pgtable_gfp_flags(mm, GFP_KERNEL));
#ifdef CONFIG_PPC_8xx
#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC_BOOK3S_603)
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

2
arch/powerpc/mm/mem.c
View File

@ -412,7 +412,7 @@ EXPORT_SYMBOL_GPL(walk_system_ram_range);
#ifdef CONFIG_EXECMEM
static struct execmem_info execmem_info __ro_after_init;
#ifdef CONFIG_PPC_8xx
#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC_BOOK3S_603)
static void prealloc_execmem_pgtable(void)
{
unsigned long va;