linux.git/arch/arm64/kernel/vdso.c, branch v5.19

Merge branches 'for-next/misc', 'for-next/kselftest', 'for-next/xntable', 'for-next/vdso', 'for-next/fiq', 'for-next/epan', 'for-next/kasan-vmalloc', 'for-next/fgt-boot-init', 'for-next/vhe-only' and 'for-next/neon-softirqs-disabled', remote-tracking branch 'arm64/for-next/perf' into for-next/core

2021-04-15T13:00:38+00:00

* for-next/misc:
  : Miscellaneous patches
  arm64/sve: Add compile time checks for SVE hooks in generic functions
  arm64/kernel/probes: Use BUG_ON instead of if condition followed by BUG.
  arm64/sve: Remove redundant system_supports_sve() tests
  arm64: mte: Remove unused mte_assign_mem_tag_range()
  arm64: Add __init section marker to some functions
  arm64/sve: Rework SVE access trap to convert state in registers
  docs: arm64: Fix a grammar error
  arm64: smp: Add missing prototype for some smp.c functions
  arm64: setup: name `tcr` register
  arm64: setup: name `mair` register
  arm64: stacktrace: Move start_backtrace() out of the header
  arm64: barrier: Remove spec_bar() macro
  arm64: entry: remove test_irqs_unmasked macro
  ARM64: enable GENERIC_FIND_FIRST_BIT
  arm64: defconfig: Use DEBUG_INFO_REDUCED

* for-next/kselftest:
  : Various kselftests for arm64
  kselftest: arm64: Add BTI tests
  kselftest/arm64: mte: Report filename on failing temp file creation
  kselftest/arm64: mte: Fix clang warning
  kselftest/arm64: mte: Makefile: Fix clang compilation
  kselftest/arm64: mte: Output warning about failing compiler
  kselftest/arm64: mte: Use cross-compiler if specified
  kselftest/arm64: mte: Fix MTE feature detection
  kselftest/arm64: mte: common: Fix write() warnings
  kselftest/arm64: mte: user_mem: Fix write() warning
  kselftest/arm64: mte: ksm_options: Fix fscanf warning
  kselftest/arm64: mte: Fix pthread linking
  kselftest/arm64: mte: Fix compilation with native compiler

* for-next/xntable:
  : Add hierarchical XN permissions for all page tables
  arm64: mm: use XN table mapping attributes for user/kernel mappings
  arm64: mm: use XN table mapping attributes for the linear region
  arm64: mm: add missing P4D definitions and use them consistently

* for-next/vdso:
  : Minor improvements to the compat vdso and sigpage
  arm64: compat: Poison the compat sigpage
  arm64: vdso: Avoid ISB after reading from cntvct_el0
  arm64: compat: Allow signal page to be remapped
  arm64: vdso: Remove redundant calls to flush_dcache_page()
  arm64: vdso: Use GFP_KERNEL for allocating compat vdso and signal pages

* for-next/fiq:
  : Support arm64 FIQ controller registration
  arm64: irq: allow FIQs to be handled
  arm64: Always keep DAIF.[IF] in sync
  arm64: entry: factor irq triage logic into macros
  arm64: irq: rework root IRQ handler registration
  arm64: don't use GENERIC_IRQ_MULTI_HANDLER
  genirq: Allow architectures to override set_handle_irq() fallback

* for-next/epan:
  : Support for Enhanced PAN (execute-only permissions)
  arm64: Support execute-only permissions with Enhanced PAN

* for-next/kasan-vmalloc:
  : Support CONFIG_KASAN_VMALLOC on arm64
  arm64: Kconfig: select KASAN_VMALLOC if KANSAN_GENERIC is enabled
  arm64: kaslr: support randomized module area with KASAN_VMALLOC
  arm64: Kconfig: support CONFIG_KASAN_VMALLOC
  arm64: kasan: abstract _text and _end to KERNEL_START/END
  arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC

* for-next/fgt-boot-init:
  : Booting clarifications and fine grained traps setup
  arm64: Require that system registers at all visible ELs be initialized
  arm64: Disable fine grained traps on boot
  arm64: Document requirements for fine grained traps at boot

* for-next/vhe-only:
  : Dealing with VHE-only CPUs (a.k.a. M1)
  arm64: Get rid of CONFIG_ARM64_VHE
  arm64: Cope with CPUs stuck in VHE mode
  arm64: cpufeature: Allow early filtering of feature override

* arm64/for-next/perf:
  arm64: perf: Remove redundant initialization in perf_event.c
  perf/arm_pmu_platform: Clean up with dev_printk
  perf/arm_pmu_platform: Fix error handling
  perf/arm_pmu_platform: Use dev_err_probe() for IRQ errors
  docs: perf: Address some html build warnings
  docs: perf: Add new description on HiSilicon uncore PMU v2
  drivers/perf: hisi: Add support for HiSilicon PA PMU driver
  drivers/perf: hisi: Add support for HiSilicon SLLC PMU driver
  drivers/perf: hisi: Update DDRC PMU for programmable counter
  drivers/perf: hisi: Add new functions for HHA PMU
  drivers/perf: hisi: Add new functions for L3C PMU
  drivers/perf: hisi: Add PMU version for uncore PMU drivers.
  drivers/perf: hisi: Refactor code for more uncore PMUs
  drivers/perf: hisi: Remove unnecessary check of counter index
  drivers/perf: Simplify the SMMUv3 PMU event attributes
  drivers/perf: convert sysfs sprintf family to sysfs_emit
  drivers/perf: convert sysfs scnprintf family to sysfs_emit_at() and sysfs_emit()
  drivers/perf: convert sysfs snprintf family to sysfs_emit

* for-next/neon-softirqs-disabled:
  : Run kernel mode SIMD with softirqs disabled
  arm64: fpsimd: run kernel mode NEON with softirqs disabled
  arm64: assembler: introduce wxN aliases for wN registers
  arm64: assembler: remove conditional NEON yield macros

arm64: Add __init section marker to some functions

2021-04-08T16:45:10+00:00

They are not needed after booting, so mark them as __init to move them
to the .init section.

Signed-off-by: Jisheng Zhang 
Reviewed-by: Steven Price 
Link: https://lore.kernel.org/r/20210330135449.4dcffd7f@xhacker.debian
Signed-off-by: Catalin Marinas

arm64: compat: Poison the compat sigpage

2021-03-24T16:48:41+00:00

Commit 9c698bff66ab ("ARM: ensure the signal page contains defined contents")
poisoned the unused portions of the signal page for 32-bit Arm.

Implement the same poisoning for the compat signal page on arm64 rather
than using __GFP_ZERO.

Signed-off-by: Will Deacon 
Reviewed-by: Vincenzo Frascino 
Link: https://lore.kernel.org/r/20210318170738.7756-6-will@kernel.org
Signed-off-by: Catalin Marinas

arm64: compat: Allow signal page to be remapped

2021-03-24T16:48:41+00:00

For compatability with 32-bit Arm, allow the compat signal page to be
remapped via mremap().

Signed-off-by: Will Deacon 
Reviewed-by: Vincenzo Frascino 
Link: https://lore.kernel.org/r/20210318170738.7756-4-will@kernel.org
Signed-off-by: Catalin Marinas

arm64: vdso: Remove redundant calls to flush_dcache_page()

2021-03-24T16:48:41+00:00

flush_dcache_page() ensures that the 'PG_dcache_clean' flag for its
'page' argument is clear so that cache maintenance will be performed
if the page is mapped into userspace with execute permissions.

Newly allocated pages have this flag clear, so there is no need to call
flush_dcache_page() for the compat vdso or signal pages. Remove the
redundant calls.

Signed-off-by: Will Deacon 
Reviewed-by: Vincenzo Frascino 
Link: https://lore.kernel.org/r/20210318170738.7756-3-will@kernel.org
Signed-off-by: Catalin Marinas

arm64: vdso: Use GFP_KERNEL for allocating compat vdso and signal pages

2021-03-24T16:48:40+00:00

There's no need to allocate the compat vDSO and signal pages using
GFP_ATOMIC allocations, so use GFP_KERNEL instead.

Signed-off-by: Will Deacon 
Reviewed-by: Vincenzo Frascino 
Link: https://lore.kernel.org/r/20210318170738.7756-2-will@kernel.org
Signed-off-by: Catalin Marinas

mm: forbid splitting special mappings

2020-12-15T20:13:41+00:00

Don't allow splitting of vm_special_mapping's.  It affects vdso/vvar
areas.  Uprobes have only one page in xol_area so they aren't affected.

Those restrictions were enforced by checks in .mremap() callbacks.
Restrict resizing with generic .split() callback.

Link: https://lkml.kernel.org/r/20201013013416.390574-7-dima@arista.com
Signed-off-by: Dmitry Safonov 
Cc: Alexander Viro 
Cc: Andy Lutomirski 
Cc: Brian Geffon 
Cc: Catalin Marinas 
Cc: Dan Carpenter 
Cc: Dan Williams 
Cc: Dave Jiang 
Cc: Hugh Dickins 
Cc: Ingo Molnar 
Cc: Jason Gunthorpe 
Cc: John Hubbard 
Cc: "Kirill A. Shutemov" 
Cc: Mike Kravetz 
Cc: Minchan Kim 
Cc: Ralph Campbell 
Cc: Russell King 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Vishal Verma 
Cc: Vlastimil Babka 
Cc: Will Deacon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

arm64: vdso: Fix unusual formatting in *setup_additional_pages()

2020-09-01T12:37:57+00:00

There's really no need to put every parameter on a new line when calling
a function with a long name, so reformat the *setup_additional_pages()
functions in the vDSO setup code to follow the usual conventions.

Acked-by: Mark Rutland 
Reviewed-by: Vincenzo Frascino 
Reviewed-by: Ard Biesheuvel 
Signed-off-by: Will Deacon

arm64: vdso32: Remove a bunch of #ifdef CONFIG_COMPAT_VDSO guards

2020-09-01T12:37:56+00:00

Most of the compat vDSO code can be built and guarded using IS_ENABLED,
so drop the unnecessary #ifdefs.

Reviewed-by: Vincenzo Frascino 
Reviewed-by: Ard Biesheuvel 
Reviewed-by: Mark Rutland 
Signed-off-by: Will Deacon

arm64/vdso: Restrict splitting VVAR VMA

2020-07-24T17:06:52+00:00

Forbid splitting VVAR VMA resulting in a stricter ABI and reducing the
amount of corner-cases to consider while working further on VDSO time
namespace support.

As the offset from timens to VVAR page is computed compile-time, the pages
in VVAR should stay together and not being partically mremap()'ed.

Signed-off-by: Andrei Vagin 
Reviewed-by: Vincenzo Frascino 
Reviewed-by: Dmitry Safonov 
Link: https://lore.kernel.org/r/20200624083321.144975-6-avagin@gmail.com
Signed-off-by: Catalin Marinas