linux-toradex.git/arch/arm64/kernel/machine_kexec.c, branch v7.1

arm64: kexec: Remove duplicate allocation for trans_pgd

2026-04-08T16:49:08+00:00

trans_pgd would be allocated in trans_pgd_create_copy(), so remove the
duplicate allocation before calling trans_pgd_create_copy().

Fixes: 3744b5280e67 ("arm64: kexec: install a copy of the linear-map")
Signed-off-by: Wang Wensheng 
Reviewed-by: Pasha Tatashin 
Signed-off-by: Catalin Marinas

arm64: Fix typos and spelling errors in comments

2025-11-12T17:06:21+00:00

This patch corrects several minor typographical and spelling errors
in comments across multiple arm64 source files.

No functional changes.

Signed-off-by: mrigendrachaubey 
Signed-off-by: Catalin Marinas

kexec: Consolidate machine_kexec_mask_interrupts() implementation

2024-12-11T19:32:34+00:00

Consolidate the machine_kexec_mask_interrupts implementation into a common
function located in a new file: kernel/irq/kexec.c. This removes duplicate
implementations from architecture-specific files in arch/arm, arch/arm64,
arch/powerpc, and arch/riscv, reducing code duplication and improving
maintainability.

The new implementation retains architecture-specific behavior for
CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD, which was previously implemented
for ARM64. When enabled (currently for ARM64), it clears the active state
of interrupts forwarded to virtual machines (VMs) before handling other
interrupt masking operations.

Signed-off-by: Eliav Farber 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20241204142003.32859-2-farbere@amazon.com

arm64, crash: wrap crash dumping code into crash related ifdefs

2024-02-24T01:48:23+00:00

Now crash codes under kernel/ folder has been split out from kexec
code, crash dumping can be separated from kexec reboot in config
items on arm64 with some adjustments.

Here wrap up crash dumping codes with CONFIG_CRASH_DUMP ifdeffery.

[bhe@redhat.com: fix building error in generic codes]
  Link: https://lkml.kernel.org/r/20240129135033.157195-2-bhe@redhat.com
Link: https://lkml.kernel.org/r/20240124051254.67105-8-bhe@redhat.com
Signed-off-by: Baoquan He 
Cc: Al Viro 
Cc: Eric W. Biederman 
Cc: Hari Bathini 
Cc: Pingfan Liu 
Cc: Klara Modin 
Cc: Michael Kelley 
Cc: Nathan Chancellor 
Cc: Stephen Rothwell 
Cc: Yang Li 
Signed-off-by: Andrew Morton

kexec_file, arm64: print out debugging message if required

2023-12-20T23:02:57+00:00

Then when specifying '-d' for kexec_file_load interface, loaded locations
of kernel/initrd/cmdline etc can be printed out to help debug.

Here replace pr_debug() with the newly added kexec_dprintk() in kexec_file
loading related codes.

And also remove the kimage->segment[] printing because the generic code
has done the printing.

Link: https://lkml.kernel.org/r/20231213055747.61826-5-bhe@redhat.com
Signed-off-by: Baoquan He 
Cc: Conor Dooley 
Cc: Joe Perches 
Cc: Nathan Chancellor 
Signed-off-by: Andrew Morton

Merge branch 'for-next/misc' into for-next/core

2023-04-20T10:22:09+00:00

* for-next/misc:
  arm64: kexec: include reboot.h
  arm64: delete dead code in this_cpu_set_vectors()
  arm64: kernel: Fix kernel warning when nokaslr is passed to commandline
  arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step
  arm64/sme: Fix some comments of ARM SME
  arm64/signal: Alloc tpidr2 sigframe after checking system_supports_tpidr2()
  arm64/signal: Use system_supports_tpidr2() to check TPIDR2
  arm64: compat: Remove defines now in asm-generic
  arm64: kexec: remove unnecessary (void*) conversions
  arm64: armv8_deprecated: remove unnecessary (void*) conversions
  firmware: arm_sdei: Fix sleep from invalid context BUG

arm64: kexec: include reboot.h

2023-04-20T09:45:23+00:00

Include reboot.h in machine_kexec.c for declaration of
machine_crash_shutdown.

gcc-12 with W=1 reports:

 arch/arm64/kernel/machine_kexec.c:257:6: warning: no previous prototype for 'machine_crash_shutdown' [-Wmissing-prototypes]
   257 | void machine_crash_shutdown(struct pt_regs *regs)

No functional changes intended.
Compile tested only.

Signed-off-by: Simon Horman 
Link: https://lore.kernel.org/r/20230418-arm64-kexec-include-reboot-v1-1-8453fd4fb3fb@kernel.org
Signed-off-by: Will Deacon

arm64: kdump : take off the protection on crashkernel memory region

2023-04-11T18:24:46+00:00

Problem:
=======
On arm64, block and section mapping is supported to build page tables.
However, currently it enforces to take base page mapping for the whole
linear mapping if CONFIG_ZONE_DMA or CONFIG_ZONE_DMA32 is enabled and
crashkernel kernel parameter is set. This will cause longer time of the
linear mapping process during bootup and severe performance degradation
during running time.

Root cause:
==========
On arm64, crashkernel reservation relies on knowing the upper limit of
low memory zone because it needs to reserve memory in the zone so that
devices' DMA addressing in kdump kernel can be satisfied. However, the
upper limit of low memory on arm64 is variant. And the upper limit can
only be decided late till bootmem_init() is called [1].

And we need to map the crashkernel region with base page granularity when
doing linear mapping, because kdump needs to protect the crashkernel region
via set_memory_valid(,0) after kdump kernel loading. However, arm64 doesn't
support well on splitting the built block or section mapping due to some
cpu reststriction [2]. And unfortunately, the linear mapping is done before
bootmem_init().

To resolve the above conflict on arm64, the compromise is enforcing to
take base page mapping for the entire linear mapping if crashkernel is
set, and CONFIG_ZONE_DMA or CONFIG_ZONE_DMA32 is enabed. Hence
performance is sacrificed.

Solution:
=========
Comparing with the base page mapping for the whole linear region, it's
better to take off the protection on crashkernel memory region for the
time being because the anticipated stamping on crashkernel memory region
could only happen in a chance in one million, while the base page mapping
for the whole linear region is mitigating arm64 systems with crashkernel
set always.

[1]
https://lore.kernel.org/all/YrIIJkhKWSuAqkCx@arm.com/T/#u

[2]
https://lore.kernel.org/linux-arm-kernel/20190911182546.17094-1-nsaenzjulienne@suse.de/T/

Signed-off-by: Baoquan He 
Acked-by: Catalin Marinas 
Acked-by: Mike Rapoport (IBM) 
Reviewed-by: Zhen Lei 
Link: https://lore.kernel.org/r/20230407011507.17572-2-bhe@redhat.com
Signed-off-by: Will Deacon

arm64: kexec: remove unnecessary (void*) conversions

2023-03-28T14:43:57+00:00

Pointer variables of void * type do not require type cast.

Signed-off-by: Yu Zhe 
Link: https://lore.kernel.org/r/20230303025715.32570-1-yuzhe@nfschina.com
Signed-off-by: Will Deacon

treewide: Drop function_nocfi

2022-09-26T17:13:14+00:00

With -fsanitize=kcfi, we no longer need function_nocfi() as
the compiler won't change function references to point to a
jump table. Remove all implementations and uses of the macro.

Signed-off-by: Sami Tolvanen 
Reviewed-by: Kees Cook 
Tested-by: Kees Cook 
Tested-by: Nathan Chancellor 
Acked-by: Peter Zijlstra (Intel) 
Tested-by: Peter Zijlstra (Intel) 
Signed-off-by: Kees Cook 
Link: https://lore.kernel.org/r/20220908215504.3686827-14-samitolvanen@google.com