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ARM: 9247/1: mm: set readonly for MT_MEMORY_RO with ARM_LPAE 

[ Upstream commit 14ca1a4690 ]

MT_MEMORY_RO is introduced by commit 598f0a99fa ("ARM: 9210/1:
Mark the FDT_FIXED sections as shareable"), which is a readonly
memory type for FDT area, but there are some different between
ARM_LPAE and non-ARM_LPAE, we need to setup PMD_SECT_AP2 and
L_PMD_SECT_RDONLY for MT_MEMORY_RO when ARM_LAPE enabled.

non-ARM_LPAE	0xff800000-0xffa00000           2M PGD KERNEL      ro NX SHD
ARM_LPAE	0xff800000-0xffc00000           4M PMD RW NX SHD
ARM_LPAE+fix	0xff800000-0xffc00000           4M PMD ro NX SHD

Fixes: 598f0a99fa ("ARM: 9210/1: Mark the FDT_FIXED sections as shareable")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wang Kefeng 2022-09-16 12:10:49 +01:00 committed by Greg Kroah-Hartman
parent b6e52aca6e
commit 3c2dc9315c
1 changed files with 4 additions and 0 deletions
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4
arch/arm/mm/mmu.c
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@ -300,7 +300,11 @@ static struct mem_type mem_types[] __ro_after_init = {
.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
L_PTE_XN | L_PTE_RDONLY,
.prot_l1 = PMD_TYPE_TABLE,
#ifdef CONFIG_ARM_LPAE
.prot_sect = PMD_TYPE_SECT | L_PMD_SECT_RDONLY | PMD_SECT_AP2,
#else
.prot_sect = PMD_TYPE_SECT,
#endif
.domain = DOMAIN_KERNEL,
},
[MT_ROM] = {