4ba380f616
Pull arm64 updates from Catalin Marinas:
"Apart from the arm64-specific bits (core arch and perf, new arm64
selftests), it touches the generic cow_user_page() (reviewed by
Kirill) together with a macro for x86 to preserve the existing
behaviour on this architecture.
Summary:
- On ARMv8 CPUs without hardware updates of the access flag, avoid
failing cow_user_page() on PFN mappings if the pte is old. The
patches introduce an arch_faults_on_old_pte() macro, defined as
false on x86. When true, cow_user_page() makes the pte young before
attempting __copy_from_user_inatomic().
- Covert the synchronous exception handling paths in
arch/arm64/kernel/entry.S to C.
- FTRACE_WITH_REGS support for arm64.
- ZONE_DMA re-introduced on arm64 to support Raspberry Pi 4
- Several kselftest cases specific to arm64, together with a
MAINTAINERS update for these files (moved to the ARM64 PORT entry).
- Workaround for a Neoverse-N1 erratum where the CPU may fetch stale
instructions under certain conditions.
- Workaround for Cortex-A57 and A72 errata where the CPU may
speculatively execute an AT instruction and associate a VMID with
the wrong guest page tables (corrupting the TLB).
- Perf updates for arm64: additional PMU topologies on HiSilicon
platforms, support for CCN-512 interconnect, AXI ID filtering in
the IMX8 DDR PMU, support for the CCPI2 uncore PMU in ThunderX2.
- GICv3 optimisation to avoid a heavy barrier when accessing the
ICC_PMR_EL1 register.
- ELF HWCAP documentation updates and clean-up.
- SMC calling convention conduit code clean-up.
- KASLR diagnostics printed during boot
- NVIDIA Carmel CPU added to the KPTI whitelist
- Some arm64 mm clean-ups: use generic free_initrd_mem(), remove
stale macro, simplify calculation in __create_pgd_mapping(), typos.
- Kconfig clean-ups: CMDLINE_FORCE to depend on CMDLINE, choice for
endinanness to help with allmodconfig"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (93 commits)
arm64: Kconfig: add a choice for endianness
kselftest: arm64: fix spelling mistake "contiguos" -> "contiguous"
arm64: Kconfig: make CMDLINE_FORCE depend on CMDLINE
MAINTAINERS: Add arm64 selftests to the ARM64 PORT entry
arm64: kaslr: Check command line before looking for a seed
arm64: kaslr: Announce KASLR status on boot
kselftest: arm64: fake_sigreturn_misaligned_sp
kselftest: arm64: fake_sigreturn_bad_size
kselftest: arm64: fake_sigreturn_duplicated_fpsimd
kselftest: arm64: fake_sigreturn_missing_fpsimd
kselftest: arm64: fake_sigreturn_bad_size_for_magic0
kselftest: arm64: fake_sigreturn_bad_magic
kselftest: arm64: add helper get_current_context
kselftest: arm64: extend test_init functionalities
kselftest: arm64: mangle_pstate_invalid_mode_el[123][ht]
kselftest: arm64: mangle_pstate_invalid_daif_bits
kselftest: arm64: mangle_pstate_invalid_compat_toggle and common utils
kselftest: arm64: extend toplevel skeleton Makefile
drivers/perf: hisi: update the sccl_id/ccl_id for certain HiSilicon platform
arm64: mm: reserve CMA and crashkernel in ZONE_DMA32
...
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_ASM_UACCESS_H
|
|
#define __ASM_ASM_UACCESS_H
|
|
|
|
#include <asm/alternative.h>
|
|
#include <asm/kernel-pgtable.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/sysreg.h>
|
|
#include <asm/assembler.h>
|
|
|
|
/*
|
|
* User access enabling/disabling macros.
|
|
*/
|
|
#ifdef CONFIG_ARM64_SW_TTBR0_PAN
|
|
.macro __uaccess_ttbr0_disable, tmp1
|
|
mrs \tmp1, ttbr1_el1 // swapper_pg_dir
|
|
bic \tmp1, \tmp1, #TTBR_ASID_MASK
|
|
sub \tmp1, \tmp1, #RESERVED_TTBR0_SIZE // reserved_ttbr0 just before swapper_pg_dir
|
|
msr ttbr0_el1, \tmp1 // set reserved TTBR0_EL1
|
|
isb
|
|
add \tmp1, \tmp1, #RESERVED_TTBR0_SIZE
|
|
msr ttbr1_el1, \tmp1 // set reserved ASID
|
|
isb
|
|
.endm
|
|
|
|
.macro __uaccess_ttbr0_enable, tmp1, tmp2
|
|
get_current_task \tmp1
|
|
ldr \tmp1, [\tmp1, #TSK_TI_TTBR0] // load saved TTBR0_EL1
|
|
mrs \tmp2, ttbr1_el1
|
|
extr \tmp2, \tmp2, \tmp1, #48
|
|
ror \tmp2, \tmp2, #16
|
|
msr ttbr1_el1, \tmp2 // set the active ASID
|
|
isb
|
|
msr ttbr0_el1, \tmp1 // set the non-PAN TTBR0_EL1
|
|
isb
|
|
.endm
|
|
|
|
.macro uaccess_ttbr0_disable, tmp1, tmp2
|
|
alternative_if_not ARM64_HAS_PAN
|
|
save_and_disable_irq \tmp2 // avoid preemption
|
|
__uaccess_ttbr0_disable \tmp1
|
|
restore_irq \tmp2
|
|
alternative_else_nop_endif
|
|
.endm
|
|
|
|
.macro uaccess_ttbr0_enable, tmp1, tmp2, tmp3
|
|
alternative_if_not ARM64_HAS_PAN
|
|
save_and_disable_irq \tmp3 // avoid preemption
|
|
__uaccess_ttbr0_enable \tmp1, \tmp2
|
|
restore_irq \tmp3
|
|
alternative_else_nop_endif
|
|
.endm
|
|
#else
|
|
.macro uaccess_ttbr0_disable, tmp1, tmp2
|
|
.endm
|
|
|
|
.macro uaccess_ttbr0_enable, tmp1, tmp2, tmp3
|
|
.endm
|
|
#endif
|
|
|
|
#endif
|