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powerpc/8xx: Preallocate execmem page tables

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Preallocate execmem page tables before creating new PGDs so that
all PGD entries related to execmem can be copied in pgd_alloc().

On 8xx there are 32 Mbytes for execmem by default so this will use
32 kbytes.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/a7180cc1ba59dec4502af39b4e9f3ff91c57280d.1724173828.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2024-08-20 19:23:51 +02:00 committed by Michael Ellerman
parent c5eec4df25
commit 16a71c0451
1 changed files with 14 additions and 0 deletions
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14
arch/powerpc/mm/mem.c
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@ -412,6 +412,18 @@ EXPORT_SYMBOL_GPL(walk_system_ram_range);
#ifdef CONFIG_EXECMEM
static struct execmem_info execmem_info __ro_after_init;
#ifdef CONFIG_PPC_8xx
static void prealloc_execmem_pgtable(void)
{
unsigned long va;
for (va = ALIGN_DOWN(MODULES_VADDR, PGDIR_SIZE); va < MODULES_END; va += PGDIR_SIZE)
pte_alloc_kernel(pmd_off_k(va), va);
}
#else
static void prealloc_execmem_pgtable(void) { }
#endif
struct execmem_info __init *execmem_arch_setup(void)
{
pgprot_t kprobes_prot = strict_module_rwx_enabled() ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
@ -443,6 +455,8 @@ struct execmem_info __init *execmem_arch_setup(void)
end = VMALLOC_END;
#endif
prealloc_execmem_pgtable();
execmem_info = (struct execmem_info){
.ranges = {
[EXECMEM_DEFAULT] = {