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linux/arch/arm/mm
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Linus Walleij 7af5b901e8 ARM: 9358/2: Implement PAN for LPAE by TTBR0 page table walks disablement 
With LPAE enabled, privileged no-access cannot be enforced using CPU
domains as such feature is not available. This patch implements PAN
by disabling TTBR0 page table walks while in kernel mode.

The ARM architecture allows page table walks to be split between TTBR0
and TTBR1. With LPAE enabled, the split is defined by a combination of
TTBCR T0SZ and T1SZ bits. Currently, an LPAE-enabled kernel uses TTBR0
for user addresses and TTBR1 for kernel addresses with the VMSPLIT_2G
and VMSPLIT_3G configurations. The main advantage for the 3:1 split is
that TTBR1 is reduced to 2 levels, so potentially faster TLB refill
(though usually the first level entries are already cached in the TLB).

The PAN support on LPAE-enabled kernels uses TTBR0 when running in user
space or in kernel space during user access routines (TTBCR T0SZ and
T1SZ are both 0). When running user accesses are disabled in kernel
mode, TTBR0 page table walks are disabled by setting TTBCR.EPD0. TTBR1
is used for kernel accesses (including loadable modules; anything
covered by swapper_pg_dir) by reducing the TTBCR.T0SZ to the minimum
(2^(32-7) = 32MB). To avoid user accesses potentially hitting stale TLB
entries, the ASID is switched to 0 (reserved) by setting TTBCR.A1 and
using the ASID value in TTBR1. The difference from a non-PAN kernel is
that with the 3:1 memory split, TTBR1 always uses 3 levels of page
tables.

As part of the change we are using preprocessor elif definied() clauses
so balance these clauses by converting relevant precedingt ifdef
clauses to if defined() clauses.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2024-04-18 12:10:46 +01:00
..
abort-ev4.S
abort-ev4t.S
abort-ev5t.S
abort-ev5tj.S
abort-ev6.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
abort-ev7.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
abort-lv4t.S
abort-macro.S
abort-nommu.S
alignment.c ARM: 9214/1: alignment: advance IT state after emulating Thumb instruction 2022-07-06 22:44:49 +01:00
cache-b15-rac.c ARM: mm: fix typos in comments 2022-04-04 10:18:54 -07:00
cache-fa.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
cache-feroceon-l2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 1) 2022-06-10 14:51:35 +02:00
cache-l2x0-pmu.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
cache-l2x0.c ARM: 9007/1: l2c: fix prefetch bits init in L2X0_AUX_CTRL using DT values 2020-09-15 14:35:53 +01:00
cache-nop.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cache-tauros2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 1) 2022-06-10 14:51:35 +02:00
cache-tauros3.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 171 2019-05-30 11:26:39 -07:00
cache-uniphier.c ARM: uniphier: fix cache kernel-doc warnings 2023-09-27 11:02:14 +02:00
cache-v4.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cache-v4wb.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
cache-v4wt.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cache-v6.S ARM: Delete ARM11MPCore (ARM11 ARMv6K SMP) support 2023-12-22 11:43:16 +00:00
cache-v7.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
cache-v7m.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
cache-xsc3l2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
context.c ARM: mm: make vmalloc_seq handling SMP safe 2022-01-25 09:53:52 +01:00
copypage-fa.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
copypage-feroceon.c ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
copypage-v4mc.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
copypage-v4wb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
copypage-v4wt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
copypage-v6.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
copypage-xsc3.c ARM: PXA: fix multi-cpu build of xsc3 2022-05-07 22:56:16 +02:00
copypage-xscale.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
dma-mapping-nommu.c iommu: Remove struct iommu_ops *iommu from arch_setup_dma_ops() 2023-12-12 10:18:45 +01:00
dma-mapping.c IOMMU Updates for Linux v6.8 2024-01-18 15:16:57 -08:00
dma.h
dump.c mm/treewide: replace pmd_large() with pmd_leaf() 2024-03-06 13:04:19 -08:00
extable.c
fault-armv.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
fault.c ARM: 9358/2: Implement PAN for LPAE by TTBR0 page table walks disablement 2024-04-18 12:10:46 +01:00
fault.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
flush.c ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses 2024-03-11 16:04:19 +00:00
fsr-2level.c
fsr-3level.c
hugetlbpage.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
idmap.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
init.c ARM updates for v6.9-rc1 2024-03-23 09:17:03 -07:00
iomap.c ARM: 8923/1: mm: include <asm/vga.h> for vga_base 2019-10-31 16:58:54 +00:00
ioremap.c mm: Introduce vmap_page_range() to map pages in PCI address space 2024-03-11 16:58:10 +01:00
kasan_init.c ARM: 9329/1: kasan: Use memblock_alloc_try_nid_raw for shadow page 2023-12-05 11:42:15 +00:00
Kconfig ARM: Delete ARM11MPCore (ARM11 ARMv6K SMP) support 2023-12-22 11:43:16 +00:00
l2c-common.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
l2c-l2x0-resume.S
Makefile ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
mm.h arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
mmap.c arm: Use the generic devmem_is_allowed() 2020-12-11 12:28:24 -08:00
mmu.c ARM: 9356/2: Move asm statements accessing TTBCR into C functions 2024-04-18 12:10:44 +01:00
nommu.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
pabort-legacy.S
pabort-v6.S
pabort-v7.S
pageattr.c minmax: add in_range() macro 2023-08-24 16:20:18 -07:00
pgd.c ARM: 9016/2: Initialize the mapping of KASan shadow memory 2020-10-27 12:11:10 +00:00
physaddr.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
pmsa-v7.c ARM: 9069/1: NOMMU: Fix conversion for_each_membock() to for_each_mem_range() 2021-03-25 10:25:20 +00:00
pmsa-v8.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
proc-arm7tdmi.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm9tdmi.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm720.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm740.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm920.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm922.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm925.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm926.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm940.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm946.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1020.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1020e.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1022.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1026.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-fa526.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-feroceon.S ARM: vfp: Remove workaround for Feroceon CPUs 2023-05-17 13:11:38 +02:00
proc-macros.S ARM: 9284/1: include <asm/pgtable.h> from proc-macros.S to fix -Wundef warnings 2023-01-11 16:22:05 +00:00
proc-mohawk.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-sa110.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-sa1100.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-syms.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
proc-v6.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
proc-v7-2level.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
proc-v7-3level.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
proc-v7-bugs.c ARM: 9213/1: Print message about disabled Spectre workarounds only once 2022-07-06 22:44:49 +01:00
proc-v7.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
proc-v7m.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
proc-xsc3.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-xscale.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
ptdump_debugfs.c ARM: 9074/1: ptdump: convert to DEFINE_SHOW_ATTRIBUTE 2021-04-18 19:15:13 +01:00
pv-fixup-asm.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
tlb-fa.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
tlb-v4.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
tlb-v4wb.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
tlb-v4wbi.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
tlb-v6.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
tlb-v7.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00