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1500 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Barry Song
|
6434e69814 |
mm: arm64: fix the out-of-bounds issue in contpte_clear_young_dirty_ptes
We are passing a huge nr to __clear_young_dirty_ptes() right now. While
we should pass the number of pages, we are actually passing CONT_PTE_SIZE.
This is causing lots of crashes of MADV_FREE, panic oops could vary
everytime.
Link: https://lkml.kernel.org/r/20240524005444.135417-1-21cnbao@gmail.com
Fixes:
|
||
Linus Torvalds
|
61307b7be4 |
The usual shower of singleton fixes and minor series all over MM,
documented (hopefully adequately) in the respective changelogs. Notable
series include:
- Lucas Stach has provided some page-mapping
cleanup/consolidation/maintainability work in the series "mm/treewide:
Remove pXd_huge() API".
- In the series "Allow migrate on protnone reference with
MPOL_PREFERRED_MANY policy", Donet Tom has optimized mempolicy's
MPOL_PREFERRED_MANY mode, yielding almost doubled performance in one
test.
- In their series "Memory allocation profiling" Kent Overstreet and
Suren Baghdasaryan have contributed a means of determining (via
/proc/allocinfo) whereabouts in the kernel memory is being allocated:
number of calls and amount of memory.
- Matthew Wilcox has provided the series "Various significant MM
patches" which does a number of rather unrelated things, but in largely
similar code sites.
- In his series "mm: page_alloc: freelist migratetype hygiene" Johannes
Weiner has fixed the page allocator's handling of migratetype requests,
with resulting improvements in compaction efficiency.
- In the series "make the hugetlb migration strategy consistent" Baolin
Wang has fixed a hugetlb migration issue, which should improve hugetlb
allocation reliability.
- Liu Shixin has hit an I/O meltdown caused by readahead in a
memory-tight memcg. Addressed in the series "Fix I/O high when memory
almost met memcg limit".
- In the series "mm/filemap: optimize folio adding and splitting" Kairui
Song has optimized pagecache insertion, yielding ~10% performance
improvement in one test.
- Baoquan He has cleaned up and consolidated the early zone
initialization code in the series "mm/mm_init.c: refactor
free_area_init_core()".
- Baoquan has also redone some MM initializatio code in the series
"mm/init: minor clean up and improvement".
- MM helper cleanups from Christoph Hellwig in his series "remove
follow_pfn".
- More cleanups from Matthew Wilcox in the series "Various page->flags
cleanups".
- Vlastimil Babka has contributed maintainability improvements in the
series "memcg_kmem hooks refactoring".
- More folio conversions and cleanups in Matthew Wilcox's series
"Convert huge_zero_page to huge_zero_folio"
"khugepaged folio conversions"
"Remove page_idle and page_young wrappers"
"Use folio APIs in procfs"
"Clean up __folio_put()"
"Some cleanups for memory-failure"
"Remove page_mapping()"
"More folio compat code removal"
- David Hildenbrand chipped in with "fs/proc/task_mmu: convert hugetlb
functions to work on folis".
- Code consolidation and cleanup work related to GUP's handling of
hugetlbs in Peter Xu's series "mm/gup: Unify hugetlb, part 2".
- Rick Edgecombe has developed some fixes to stack guard gaps in the
series "Cover a guard gap corner case".
- Jinjiang Tu has fixed KSM's behaviour after a fork+exec in the series
"mm/ksm: fix ksm exec support for prctl".
- Baolin Wang has implemented NUMA balancing for multi-size THPs. This
is a simple first-cut implementation for now. The series is "support
multi-size THP numa balancing".
- Cleanups to vma handling helper functions from Matthew Wilcox in the
series "Unify vma_address and vma_pgoff_address".
- Some selftests maintenance work from Dev Jain in the series
"selftests/mm: mremap_test: Optimizations and style fixes".
- Improvements to the swapping of multi-size THPs from Ryan Roberts in
the series "Swap-out mTHP without splitting".
- Kefeng Wang has significantly optimized the handling of arm64's
permission page faults in the series
"arch/mm/fault: accelerate pagefault when badaccess"
"mm: remove arch's private VM_FAULT_BADMAP/BADACCESS"
- GUP cleanups from David Hildenbrand in "mm/gup: consistently call it
GUP-fast".
- hugetlb fault code cleanups from Vishal Moola in "Hugetlb fault path to
use struct vm_fault".
- selftests build fixes from John Hubbard in the series "Fix
selftests/mm build without requiring "make headers"".
- Memory tiering fixes/improvements from Ho-Ren (Jack) Chuang in the
series "Improved Memory Tier Creation for CPUless NUMA Nodes". Fixes
the initialization code so that migration between different memory types
works as intended.
- David Hildenbrand has improved follow_pte() and fixed an errant driver
in the series "mm: follow_pte() improvements and acrn follow_pte()
fixes".
- David also did some cleanup work on large folio mapcounts in his
series "mm: mapcount for large folios + page_mapcount() cleanups".
- Folio conversions in KSM in Alex Shi's series "transfer page to folio
in KSM".
- Barry Song has added some sysfs stats for monitoring multi-size THP's
in the series "mm: add per-order mTHP alloc and swpout counters".
- Some zswap cleanups from Yosry Ahmed in the series "zswap same-filled
and limit checking cleanups".
- Matthew Wilcox has been looking at buffer_head code and found the
documentation to be lacking. The series is "Improve buffer head
documentation".
- Multi-size THPs get more work, this time from Lance Yang. His series
"mm/madvise: enhance lazyfreeing with mTHP in madvise_free" optimizes
the freeing of these things.
- Kemeng Shi has added more userspace-visible writeback instrumentation
in the series "Improve visibility of writeback".
- Kemeng Shi then sent some maintenance work on top in the series "Fix
and cleanups to page-writeback".
- Matthew Wilcox reduces mmap_lock traffic in the anon vma code in the
series "Improve anon_vma scalability for anon VMAs". Intel's test bot
reported an improbable 3x improvement in one test.
- SeongJae Park adds some DAMON feature work in the series
"mm/damon: add a DAMOS filter type for page granularity access recheck"
"selftests/damon: add DAMOS quota goal test"
- Also some maintenance work in the series
"mm/damon/paddr: simplify page level access re-check for pageout"
"mm/damon: misc fixes and improvements"
- David Hildenbrand has disabled some known-to-fail selftests ni the
series "selftests: mm: cow: flag vmsplice() hugetlb tests as XFAIL".
- memcg metadata storage optimizations from Shakeel Butt in "memcg:
reduce memory consumption by memcg stats".
- DAX fixes and maintenance work from Vishal Verma in the series
"dax/bus.c: Fixups for dax-bus locking".
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Merge tag 'mm-stable-2024-05-17-19-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull mm updates from Andrew Morton:
"The usual shower of singleton fixes and minor series all over MM,
documented (hopefully adequately) in the respective changelogs.
Notable series include:
- Lucas Stach has provided some page-mapping cleanup/consolidation/
maintainability work in the series "mm/treewide: Remove pXd_huge()
API".
- In the series "Allow migrate on protnone reference with
MPOL_PREFERRED_MANY policy", Donet Tom has optimized mempolicy's
MPOL_PREFERRED_MANY mode, yielding almost doubled performance in
one test.
- In their series "Memory allocation profiling" Kent Overstreet and
Suren Baghdasaryan have contributed a means of determining (via
/proc/allocinfo) whereabouts in the kernel memory is being
allocated: number of calls and amount of memory.
- Matthew Wilcox has provided the series "Various significant MM
patches" which does a number of rather unrelated things, but in
largely similar code sites.
- In his series "mm: page_alloc: freelist migratetype hygiene"
Johannes Weiner has fixed the page allocator's handling of
migratetype requests, with resulting improvements in compaction
efficiency.
- In the series "make the hugetlb migration strategy consistent"
Baolin Wang has fixed a hugetlb migration issue, which should
improve hugetlb allocation reliability.
- Liu Shixin has hit an I/O meltdown caused by readahead in a
memory-tight memcg. Addressed in the series "Fix I/O high when
memory almost met memcg limit".
- In the series "mm/filemap: optimize folio adding and splitting"
Kairui Song has optimized pagecache insertion, yielding ~10%
performance improvement in one test.
- Baoquan He has cleaned up and consolidated the early zone
initialization code in the series "mm/mm_init.c: refactor
free_area_init_core()".
- Baoquan has also redone some MM initializatio code in the series
"mm/init: minor clean up and improvement".
- MM helper cleanups from Christoph Hellwig in his series "remove
follow_pfn".
- More cleanups from Matthew Wilcox in the series "Various
page->flags cleanups".
- Vlastimil Babka has contributed maintainability improvements in the
series "memcg_kmem hooks refactoring".
- More folio conversions and cleanups in Matthew Wilcox's series:
"Convert huge_zero_page to huge_zero_folio"
"khugepaged folio conversions"
"Remove page_idle and page_young wrappers"
"Use folio APIs in procfs"
"Clean up __folio_put()"
"Some cleanups for memory-failure"
"Remove page_mapping()"
"More folio compat code removal"
- David Hildenbrand chipped in with "fs/proc/task_mmu: convert
hugetlb functions to work on folis".
- Code consolidation and cleanup work related to GUP's handling of
hugetlbs in Peter Xu's series "mm/gup: Unify hugetlb, part 2".
- Rick Edgecombe has developed some fixes to stack guard gaps in the
series "Cover a guard gap corner case".
- Jinjiang Tu has fixed KSM's behaviour after a fork+exec in the
series "mm/ksm: fix ksm exec support for prctl".
- Baolin Wang has implemented NUMA balancing for multi-size THPs.
This is a simple first-cut implementation for now. The series is
"support multi-size THP numa balancing".
- Cleanups to vma handling helper functions from Matthew Wilcox in
the series "Unify vma_address and vma_pgoff_address".
- Some selftests maintenance work from Dev Jain in the series
"selftests/mm: mremap_test: Optimizations and style fixes".
- Improvements to the swapping of multi-size THPs from Ryan Roberts
in the series "Swap-out mTHP without splitting".
- Kefeng Wang has significantly optimized the handling of arm64's
permission page faults in the series
"arch/mm/fault: accelerate pagefault when badaccess"
"mm: remove arch's private VM_FAULT_BADMAP/BADACCESS"
- GUP cleanups from David Hildenbrand in "mm/gup: consistently call
it GUP-fast".
- hugetlb fault code cleanups from Vishal Moola in "Hugetlb fault
path to use struct vm_fault".
- selftests build fixes from John Hubbard in the series "Fix
selftests/mm build without requiring "make headers"".
- Memory tiering fixes/improvements from Ho-Ren (Jack) Chuang in the
series "Improved Memory Tier Creation for CPUless NUMA Nodes".
Fixes the initialization code so that migration between different
memory types works as intended.
- David Hildenbrand has improved follow_pte() and fixed an errant
driver in the series "mm: follow_pte() improvements and acrn
follow_pte() fixes".
- David also did some cleanup work on large folio mapcounts in his
series "mm: mapcount for large folios + page_mapcount() cleanups".
- Folio conversions in KSM in Alex Shi's series "transfer page to
folio in KSM".
- Barry Song has added some sysfs stats for monitoring multi-size
THP's in the series "mm: add per-order mTHP alloc and swpout
counters".
- Some zswap cleanups from Yosry Ahmed in the series "zswap
same-filled and limit checking cleanups".
- Matthew Wilcox has been looking at buffer_head code and found the
documentation to be lacking. The series is "Improve buffer head
documentation".
- Multi-size THPs get more work, this time from Lance Yang. His
series "mm/madvise: enhance lazyfreeing with mTHP in madvise_free"
optimizes the freeing of these things.
- Kemeng Shi has added more userspace-visible writeback
instrumentation in the series "Improve visibility of writeback".
- Kemeng Shi then sent some maintenance work on top in the series
"Fix and cleanups to page-writeback".
- Matthew Wilcox reduces mmap_lock traffic in the anon vma code in
the series "Improve anon_vma scalability for anon VMAs". Intel's
test bot reported an improbable 3x improvement in one test.
- SeongJae Park adds some DAMON feature work in the series
"mm/damon: add a DAMOS filter type for page granularity access recheck"
"selftests/damon: add DAMOS quota goal test"
- Also some maintenance work in the series
"mm/damon/paddr: simplify page level access re-check for pageout"
"mm/damon: misc fixes and improvements"
- David Hildenbrand has disabled some known-to-fail selftests ni the
series "selftests: mm: cow: flag vmsplice() hugetlb tests as
XFAIL".
- memcg metadata storage optimizations from Shakeel Butt in "memcg:
reduce memory consumption by memcg stats".
- DAX fixes and maintenance work from Vishal Verma in the series
"dax/bus.c: Fixups for dax-bus locking""
* tag 'mm-stable-2024-05-17-19-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (426 commits)
memcg, oom: cleanup unused memcg_oom_gfp_mask and memcg_oom_order
selftests/mm: hugetlb_madv_vs_map: avoid test skipping by querying hugepage size at runtime
mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_wp
mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_fault
selftests: cgroup: add tests to verify the zswap writeback path
mm: memcg: make alloc_mem_cgroup_per_node_info() return bool
mm/damon/core: fix return value from damos_wmark_metric_value
mm: do not update memcg stats for NR_{FILE/SHMEM}_PMDMAPPED
selftests: cgroup: remove redundant enabling of memory controller
Docs/mm/damon/maintainer-profile: allow posting patches based on damon/next tree
Docs/mm/damon/maintainer-profile: change the maintainer's timezone from PST to PT
Docs/mm/damon/design: use a list for supported filters
Docs/admin-guide/mm/damon/usage: fix wrong schemes effective quota update command
Docs/admin-guide/mm/damon/usage: fix wrong example of DAMOS filter matching sysfs file
selftests/damon: classify tests for functionalities and regressions
selftests/damon/_damon_sysfs: use 'is' instead of '==' for 'None'
selftests/damon/_damon_sysfs: find sysfs mount point from /proc/mounts
selftests/damon/_damon_sysfs: check errors from nr_schemes file reads
mm/damon/core: initialize ->esz_bp from damos_quota_init_priv()
selftests/damon: add a test for DAMOS quota goal
...
|
||
|
Linus Torvalds
|
0cc6f45cec |
IOMMU Updates for Linux v6.10
Including:
- Core:
- IOMMU memory usage observability - This will make the memory used
for IO page tables explicitly visible.
- Simplify arch_setup_dma_ops()
- Intel VT-d:
- Consolidate domain cache invalidation
- Remove private data from page fault message
- Allocate DMAR fault interrupts locally
- Cleanup and refactoring
- ARM-SMMUv2:
- Support for fault debugging hardware on Qualcomm implementations
- Re-land support for the ->domain_alloc_paging() callback
- ARM-SMMUv3:
- Improve handling of MSI allocation failure
- Drop support for the "disable_bypass" cmdline option
- Major rework of the CD creation code, following on directly from the
STE rework merged last time around.
- Add unit tests for the new STE/CD manipulation logic
- AMD-Vi:
- Final part of SVA changes with generic IO page fault handling
- Renesas IPMMU:
- Add support for R8A779H0 hardware
- A couple smaller fixes and updates across the sub-tree
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Merge tag 'iommu-updates-v6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull iommu updates from Joerg Roedel:
"Core:
- IOMMU memory usage observability - This will make the memory used
for IO page tables explicitly visible.
- Simplify arch_setup_dma_ops()
Intel VT-d:
- Consolidate domain cache invalidation
- Remove private data from page fault message
- Allocate DMAR fault interrupts locally
- Cleanup and refactoring
ARM-SMMUv2:
- Support for fault debugging hardware on Qualcomm implementations
- Re-land support for the ->domain_alloc_paging() callback
ARM-SMMUv3:
- Improve handling of MSI allocation failure
- Drop support for the "disable_bypass" cmdline option
- Major rework of the CD creation code, following on directly from
the STE rework merged last time around.
- Add unit tests for the new STE/CD manipulation logic
AMD-Vi:
- Final part of SVA changes with generic IO page fault handling
Renesas IPMMU:
- Add support for R8A779H0 hardware
... and a couple smaller fixes and updates across the sub-tree"
* tag 'iommu-updates-v6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (80 commits)
iommu/arm-smmu-v3: Make the kunit into a module
arm64: Properly clean up iommu-dma remnants
iommu/amd: Enable Guest Translation after reading IOMMU feature register
iommu/vt-d: Decouple igfx_off from graphic identity mapping
iommu/amd: Fix compilation error
iommu/arm-smmu-v3: Add unit tests for arm_smmu_write_entry
iommu/arm-smmu-v3: Build the whole CD in arm_smmu_make_s1_cd()
iommu/arm-smmu-v3: Move the CD generation for SVA into a function
iommu/arm-smmu-v3: Allocate the CD table entry in advance
iommu/arm-smmu-v3: Make arm_smmu_alloc_cd_ptr()
iommu/arm-smmu-v3: Consolidate clearing a CD table entry
iommu/arm-smmu-v3: Move the CD generation for S1 domains into a function
iommu/arm-smmu-v3: Make CD programming use arm_smmu_write_entry()
iommu/arm-smmu-v3: Add an ops indirection to the STE code
iommu/arm-smmu-qcom: Don't build debug features as a kernel module
iommu/amd: Add SVA domain support
iommu: Add ops->domain_alloc_sva()
iommu/amd: Initial SVA support for AMD IOMMU
iommu/amd: Add support for enable/disable IOPF
iommu/amd: Add IO page fault notifier handler
...
|
||
|
Linus Torvalds
|
a49468240e |
Modules changes for v6.10-rc1
Finally something fun. Mike Rapoport does some cleanup to allow us to
take out module_alloc() out of modules into a new paint shedded execmem_alloc()
and execmem_free() so to make emphasis these helpers are actually used outside
of modules. It starts with a no-functional changes API rename / placeholders
to then allow architectures to define their requirements into a new shiny
struct execmem_info with ranges, and requirements for those ranges. Archs
now can intitialize this execmem_info as the last part of mm_core_init() if
they have to diverge from the norm. Each range is a known type clearly
articulated and spelled out in enum execmem_type.
Although a lot of this is major cleanup and prep work for future enhancements an
immediate clear gain is we get to enable KPROBES without MODULES now. That is
ultimately what motiviated to pick this work up again, now with smaller goal as
concrete stepping stone.
This has been sitting on linux-next for a little less than a month, a few issues
were found already and fixed, in particular an odd mips boot issue. Arch folks
reviewed the code too. This is ready for wider exposure and testing.
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Merge tag 'modules-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux
Pull modules updates from Luis Chamberlain:
"Finally something fun. Mike Rapoport does some cleanup to allow us to
take out module_alloc() out of modules into a new paint shedded
execmem_alloc() and execmem_free() so to make emphasis these helpers
are actually used outside of modules.
It starts with a non-functional changes API rename / placeholders to
then allow architectures to define their requirements into a new shiny
struct execmem_info with ranges, and requirements for those ranges.
Archs now can intitialize this execmem_info as the last part of
mm_core_init() if they have to diverge from the norm. Each range is a
known type clearly articulated and spelled out in enum execmem_type.
Although a lot of this is major cleanup and prep work for future
enhancements an immediate clear gain is we get to enable KPROBES
without MODULES now. That is ultimately what motiviated to pick this
work up again, now with smaller goal as concrete stepping stone"
* tag 'modules-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux:
bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of
kprobes: remove dependency on CONFIG_MODULES
powerpc: use CONFIG_EXECMEM instead of CONFIG_MODULES where appropriate
x86/ftrace: enable dynamic ftrace without CONFIG_MODULES
arch: make execmem setup available regardless of CONFIG_MODULES
powerpc: extend execmem_params for kprobes allocations
arm64: extend execmem_info for generated code allocations
riscv: extend execmem_params for generated code allocations
mm/execmem, arch: convert remaining overrides of module_alloc to execmem
mm/execmem, arch: convert simple overrides of module_alloc to execmem
mm: introduce execmem_alloc() and execmem_free()
module: make module_memory_{alloc,free} more self-contained
sparc: simplify module_alloc()
nios2: define virtual address space for modules
mips: module: rename MODULE_START to MODULES_VADDR
arm64: module: remove unneeded call to kasan_alloc_module_shadow()
kallsyms: replace deprecated strncpy with strscpy
module: allow UNUSED_KSYMS_WHITELIST to be relative against objtree.
|
||
|
Linus Torvalds
|
103916ffe2 |
arm64 updates for 6.10
ACPI:
* Support for the Firmware ACPI Control Structure (FACS) signature
feature which is used to reboot out of hibernation on some systems.
Kbuild:
* Support for building Flat Image Tree (FIT) images, where the kernel
Image is compressed alongside a set of devicetree blobs.
Memory management:
* Optimisation of our early page-table manipulation for creation of the
linear mapping.
* Support for userfaultfd write protection, which brings along some nice
cleanups to our handling of invalid but present ptes.
* Extend our use of range TLBI invalidation at EL1.
Perf and PMUs:
* Ensure that the 'pmu->parent' pointer is correctly initialised by PMU
drivers.
* Avoid allocating 'cpumask_t' types on the stack in some PMU drivers.
* Fix parsing of the CPU PMU "version" field in assembly code, as it
doesn't follow the usual architectural rules.
* Add best-effort unwinding support for USER_STACKTRACE
* Minor driver fixes and cleanups.
Selftests:
* Minor cleanups to the arm64 selftests (missing NULL check, unused
variable).
Miscellaneous
* Add a command-line alias for disabling 32-bit application support.
* Add part number for Neoverse-V2 CPUs.
* Minor fixes and cleanups.
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Will Deacon:
"The most interesting parts are probably the mm changes from Ryan which
optimise the creation of the linear mapping at boot and (separately)
implement write-protect support for userfaultfd.
Outside of our usual directories, the Kbuild-related changes under
scripts/ have been acked by Masahiro whilst the drivers/acpi/ parts
have been acked by Rafael and the addition of cpumask_any_and_but()
has been acked by Yury.
ACPI:
- Support for the Firmware ACPI Control Structure (FACS) signature
feature which is used to reboot out of hibernation on some systems
Kbuild:
- Support for building Flat Image Tree (FIT) images, where the kernel
Image is compressed alongside a set of devicetree blobs
Memory management:
- Optimisation of our early page-table manipulation for creation of
the linear mapping
- Support for userfaultfd write protection, which brings along some
nice cleanups to our handling of invalid but present ptes
- Extend our use of range TLBI invalidation at EL1
Perf and PMUs:
- Ensure that the 'pmu->parent' pointer is correctly initialised by
PMU drivers
- Avoid allocating 'cpumask_t' types on the stack in some PMU drivers
- Fix parsing of the CPU PMU "version" field in assembly code, as it
doesn't follow the usual architectural rules
- Add best-effort unwinding support for USER_STACKTRACE
- Minor driver fixes and cleanups
Selftests:
- Minor cleanups to the arm64 selftests (missing NULL check, unused
variable)
Miscellaneous:
- Add a command-line alias for disabling 32-bit application support
- Add part number for Neoverse-V2 CPUs
- Minor fixes and cleanups"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (64 commits)
arm64/mm: Fix pud_user_accessible_page() for PGTABLE_LEVELS <= 2
arm64/mm: Add uffd write-protect support
arm64/mm: Move PTE_PRESENT_INVALID to overlay PTE_NG
arm64/mm: Remove PTE_PROT_NONE bit
arm64/mm: generalize PMD_PRESENT_INVALID for all levels
arm64: simplify arch_static_branch/_jump function
arm64: Add USER_STACKTRACE support
arm64: Add the arm64.no32bit_el0 command line option
drivers/perf: hisi: hns3: Actually use devm_add_action_or_reset()
drivers/perf: hisi: hns3: Fix out-of-bound access when valid event group
drivers/perf: hisi_pcie: Fix out-of-bound access when valid event group
kselftest: arm64: Add a null pointer check
arm64: defer clearing DAIF.D
arm64: assembler: update stale comment for disable_step_tsk
arm64/sysreg: Update PIE permission encodings
kselftest/arm64: Remove unused parameters in abi test
perf/arm-spe: Assign parents for event_source device
perf/arm-smmuv3: Assign parents for event_source device
perf/arm-dsu: Assign parents for event_source device
perf/arm-dmc620: Assign parents for event_source device
...
|
||
Mike Rapoport (IBM)
|
0cc2dc4902 |
arch: make execmem setup available regardless of CONFIG_MODULES
execmem does not depend on modules, on the contrary modules use execmem. To make execmem available when CONFIG_MODULES=n, for instance for kprobes, split execmem_params initialization out from arch/*/kernel/module.c and compile it when CONFIG_EXECMEM=y Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> |
||
Joerg Roedel
|
2bd5059c6c | Merge branches 'arm/renesas', 'arm/smmu', 'x86/amd', 'core' and 'x86/vt-d' into next | ||
Robin Murphy
|
8b80549f1b |
arm64: Properly clean up iommu-dma remnants
Thanks to the somewhat asymmetrical nature, while removing
iommu_setup_dma_ops() from the arch_setup_dma_ops() flow, I managed to
forget that arm64's teardown path was also specific to iommu-dma. Clean
that up to match, otherwise probe deferral will lead to the arch code
erroneously removing DMA ops set elsewhere.
Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/linux-iommu/Zi_LV28TR-P-PzXi@eriador.lumag.spb.ru/
Fixes:
|
||
Will Deacon
|
a5a5ce5795 |
Merge branch 'for-next/mm' into for-next/core
* for-next/mm: arm64/mm: Fix pud_user_accessible_page() for PGTABLE_LEVELS <= 2 arm64/mm: Add uffd write-protect support arm64/mm: Move PTE_PRESENT_INVALID to overlay PTE_NG arm64/mm: Remove PTE_PROT_NONE bit arm64/mm: generalize PMD_PRESENT_INVALID for all levels arm64: mm: Don't remap pgtables for allocate vs populate arm64: mm: Batch dsb and isb when populating pgtables arm64: mm: Don't remap pgtables per-cont(pte|pmd) block |
||
Lance Yang
|
89e86854fb |
mm/arm64: override clear_young_dirty_ptes() batch helper
The per-pte get_and_clear/modify/set approach would result in unfolding/refolding for contpte mappings on arm64. So we need to override clear_young_dirty_ptes() for arm64 to avoid it. Link: https://lkml.kernel.org/r/20240418134435.6092-3-ioworker0@gmail.com Signed-off-by: Lance Yang <ioworker0@gmail.com> Suggested-by: Barry Song <21cnbao@gmail.com> Suggested-by: Ryan Roberts <ryan.roberts@arm.com> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jeff Xie <xiehuan09@gmail.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Peter Xu <peterx@redhat.com> Cc: Yang Shi <shy828301@gmail.com> Cc: Yin Fengwei <fengwei.yin@intel.com> Cc: Zach O'Keefe <zokeefe@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Kefeng Wang
|
eebb5181a0 |
arm64: mm: drop VM_FAULT_BADMAP/VM_FAULT_BADACCESS
Patch series "mm: remove arch's private VM_FAULT_BADMAP/BADACCESS", v2. Directly set SEGV_MAPRR or SEGV_ACCERR for arm/arm64 to remove the last two arch's private vm_fault reasons. This patch (of 2): If bad map or access, directly set si_code to SEGV_MAPRR or SEGV_ACCERR, also set fault to 0 and goto error handling, which make us to drop the arch's special vm fault reason. Link: https://lkml.kernel.org/r/20240411130925.73281-1-wangkefeng.wang@huawei.com Link: https://lkml.kernel.org/r/20240411130925.73281-2-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Aishwarya TCV <aishwarya.tcv@arm.com> Cc: Cristian Marussi <cristian.marussi@arm.com> Cc: Mark Brown <broonie@kernel.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Mark Rutland
|
080297becc |
arm64: defer clearing DAIF.D
For historical reasons we unmask debug exceptions in __cpu_setup(), but
it's not necessary to unmask debug exceptions this early in the
boot/idle entry paths. It would be better to unmask debug exceptions
later in C code as this simplifies the current code and will make it
easier to rework exception masking logic to handle non-DAIF bits in
future (e.g. PSTATE.{ALLINT,PM}).
We started clearing DAIF.D in __cpu_setup() in commit:
|
||
|
Robin Murphy
|
f091e93306 |
dma-mapping: Simplify arch_setup_dma_ops()
The dma_base, size and iommu arguments are only used by ARM, and can now easily be deduced from the device itself, so there's no need to pass them through the callchain as well. Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Michael Kelley <mhklinux@outlook.com> # For Hyper-V Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Tested-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/5291c2326eab405b1aa7693aa964e8d3cb7193de.1713523152.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de> |
||
|
Robin Murphy
|
b67483b3c4 |
iommu/dma: Centralise iommu_setup_dma_ops()
It's somewhat hard to see, but arm64's arch_setup_dma_ops() should only ever call iommu_setup_dma_ops() after a successful iommu_probe_device(), which means there should be no harm in achieving the same order of operations by running it off the back of iommu_probe_device() itself. This then puts it in line with the x86 and s390 .probe_finalize bodges, letting us pull it all into the main flow properly. As a bonus this lets us fold in and de-scope the PCI workaround setup as well. At this point we can also then pull the call up inside the group mutex, and avoid having to think about whether iommu_group_store_type() could theoretically race and free the domain if iommu_setup_dma_ops() ran just *before* iommu_device_use_default_domain() claims it... Furthermore we replace one .probe_finalize call completely, since the only remaining implementations are now one which only needs to run once for the initial boot-time probe, and two which themselves render that path unreachable. This leaves us a big step closer to realistically being able to unpick the variety of different things that iommu_setup_dma_ops() has been muddling together, and further streamline iommu-dma into core API flows in future. Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> # For Intel IOMMU Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Tested-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/bebea331c1d688b34d9862eefd5ede47503961b8.1713523152.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de> |
||
|
Kefeng Wang
|
faab3d0f25 |
arm64: mm: accelerate pagefault when VM_FAULT_BADACCESS
The vm_flags of vma already checked under per-VMA lock, if it is a bad access, directly set fault to VM_FAULT_BADACCESS and handle error, no need to retry with mmap_lock again, the latency time reduces 34% in 'lat_sig -P 1 prot lat_sig' from lmbench testcase. Since the page fault is handled under per-VMA lock, count it as a vma lock event with VMA_LOCK_SUCCESS. Link: https://lkml.kernel.org/r/20240403083805.1818160-3-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Kefeng Wang
|
6ea02ee489 |
arm64: mm: cleanup __do_page_fault()
Patch series "arch/mm/fault: accelerate pagefault when badaccess", v2. After VMA lock-based page fault handling enabled, if bad access met under per-vma lock, it will fallback to mmap_lock-based handling, so it leads to unnessary mmap lock and vma find again. A test from lmbench shows 34% improve after this changes on arm64, lat_sig -P 1 prot lat_sig 0.29194 -> 0.19198 This patch (of 7): The __do_page_fault() only calls handle_mm_fault() after vm_flags checked, and it is only called by do_page_fault(), let's squash it into do_page_fault() to cleanup code. Link: https://lkml.kernel.org/r/20240403083805.1818160-1-wangkefeng.wang@huawei.com Link: https://lkml.kernel.org/r/20240403083805.1818160-2-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Barry Song
|
f238b8c33c |
arm64: mm: swap: support THP_SWAP on hardware with MTE
Commit
|
||
Peter Xu
|
9636f055da |
mm/treewide: remove pXd_huge()
This API is not used anymore, drop it for the whole tree. Link: https://lkml.kernel.org/r/20240318200404.448346-13-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andreas Larsson <andreas@gaisler.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Bjorn Andersson <andersson@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Fabio Estevam <festevam@denx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Konrad Dybcio <konrad.dybcio@linaro.org> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Mark Salter <msalter@redhat.com> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Peter Xu
|
1965e933dd |
mm/treewide: replace pXd_huge() with pXd_leaf()
Now after we're sure all pXd_huge() definitions are the same as pXd_leaf(), reuse it. Luckily, pXd_huge() isn't widely used. Link: https://lkml.kernel.org/r/20240318200404.448346-12-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andreas Larsson <andreas@gaisler.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Bjorn Andersson <andersson@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Fabio Estevam <festevam@denx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Konrad Dybcio <konrad.dybcio@linaro.org> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Mark Salter <msalter@redhat.com> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Peter Xu
|
961a6ee5c7 |
mm/arm64: merge pXd_huge() and pXd_leaf() definitions
Unlike most archs, aarch64 defines pXd_huge() and pXd_leaf() slightly differently. Redefine the pXd_huge() with pXd_leaf(). There used to be two traps for old aarch64 definitions over these APIs that I found when reading the code around, they're: (1) |
||
Yaxiong Tian
|
50449ca66c |
arm64: hibernate: Fix level3 translation fault in swsusp_save()
On arm64 machines, swsusp_save() faults if it attempts to access
MEMBLOCK_NOMAP memory ranges. This can be reproduced in QEMU using UEFI
when booting with rodata=off debug_pagealloc=off and CONFIG_KFENCE=n:
Unable to handle kernel paging request at virtual address ffffff8000000000
Mem abort info:
ESR = 0x0000000096000007
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x07: level 3 translation fault
Data abort info:
ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
swapper pgtable: 4k pages, 39-bit VAs, pgdp=00000000eeb0b000
[ffffff8000000000] pgd=180000217fff9803, p4d=180000217fff9803, pud=180000217fff9803, pmd=180000217fff8803, pte=0000000000000000
Internal error: Oops: 0000000096000007 [#1] SMP
Internal error: Oops: 0000000096000007 [#1] SMP
Modules linked in: xt_multiport ipt_REJECT nf_reject_ipv4 xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_filter bpfilter rfkill at803x snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg dwmac_generic stmmac_platform snd_hda_codec stmmac joydev pcs_xpcs snd_hda_core phylink ppdev lp parport ramoops reed_solomon ip_tables x_tables nls_iso8859_1 vfat multipath linear amdgpu amdxcp drm_exec gpu_sched drm_buddy hid_generic usbhid hid radeon video drm_suballoc_helper drm_ttm_helper ttm i2c_algo_bit drm_display_helper cec drm_kms_helper drm
CPU: 0 PID: 3663 Comm: systemd-sleep Not tainted 6.6.2+ #76
Source Version: 4e22ed63a0a48e7a7cff9b98b7806d8d4add7dc0
Hardware name: Greatwall GW-XXXXXX-XXX/GW-XXXXXX-XXX, BIOS KunLun BIOS V4.0 01/19/2021
pstate: 600003c5 (nZCv DAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : swsusp_save+0x280/0x538
lr : swsusp_save+0x280/0x538
sp : ffffffa034a3fa40
x29: ffffffa034a3fa40 x28: ffffff8000001000 x27: 0000000000000000
x26: ffffff8001400000 x25: ffffffc08113e248 x24: 0000000000000000
x23: 0000000000080000 x22: ffffffc08113e280 x21: 00000000000c69f2
x20: ffffff8000000000 x19: ffffffc081ae2500 x18: 0000000000000000
x17: 6666662074736420 x16: 3030303030303030 x15: 3038666666666666
x14: 0000000000000b69 x13: ffffff9f89088530 x12: 00000000ffffffea
x11: 00000000ffff7fff x10: 00000000ffff7fff x9 : ffffffc08193f0d0
x8 : 00000000000bffe8 x7 : c0000000ffff7fff x6 : 0000000000000001
x5 : ffffffa0fff09dc8 x4 : 0000000000000000 x3 : 0000000000000027
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 000000000000004e
Call trace:
swsusp_save+0x280/0x538
swsusp_arch_suspend+0x148/0x190
hibernation_snapshot+0x240/0x39c
hibernate+0xc4/0x378
state_store+0xf0/0x10c
kobj_attr_store+0x14/0x24
The reason is swsusp_save() -> copy_data_pages() -> page_is_saveable()
-> kernel_page_present() assuming that a page is always present when
can_set_direct_map() is false (all of rodata_full,
debug_pagealloc_enabled() and arm64_kfence_can_set_direct_map() false),
irrespective of the MEMBLOCK_NOMAP ranges. Such MEMBLOCK_NOMAP regions
should not be saved during hibernation.
This problem was introduced by changes to the pfn_valid() logic in
commit
|
||
Anshuman Khandual
|
015a12a4a6 |
arm64/hugetlb: Fix page table walk in huge_pte_alloc()
Currently normal HugeTLB fault ends up crashing the kernel, as p4dp derived
from p4d_offset() is an invalid address when PGTABLE_LEVEL = 5. A p4d level
entry needs to be allocated when not available while walking the page table
during HugeTLB faults. Let's call p4d_alloc() to allocate such entries when
required instead of current p4d_offset().
Unable to handle kernel paging request at virtual address ffffffff80000000
Mem abort info:
ESR = 0x0000000096000005
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x05: level 1 translation fault
Data abort info:
ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
swapper pgtable: 4k pages, 52-bit VAs, pgdp=0000000081da9000
[ffffffff80000000] pgd=1000000082cec003, p4d=0000000082c32003, pud=0000000000000000
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 108 Comm: high_addr_hugep Not tainted 6.9.0-rc4 #48
Hardware name: Foundation-v8A (DT)
pstate: 01402005 (nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : huge_pte_alloc+0xd4/0x334
lr : hugetlb_fault+0x1b8/0xc68
sp : ffff8000833bbc20
x29: ffff8000833bbc20 x28: fff000080080cb58 x27: ffff800082a7cc58
x26: 0000000000000000 x25: fff0000800378e40 x24: fff00008008d6c60
x23: 00000000de9dbf07 x22: fff0000800378e40 x21: 0004000000000000
x20: 0004000000000000 x19: ffffffff80000000 x18: 1ffe00010011d7a1
x17: 0000000000000001 x16: ffffffffffffffff x15: 0000000000000001
x14: 0000000000000000 x13: ffff8000816120d0 x12: ffffffffffffffff
x11: 0000000000000000 x10: fff00008008ebd0c x9 : 0004000000000000
x8 : 0000000000001255 x7 : fff00008003e2000 x6 : 00000000061d54b0
x5 : 0000000000001000 x4 : ffffffff80000000 x3 : 0000000000200000
x2 : 0000000000000004 x1 : 0000000080000000 x0 : 0000000000000000
Call trace:
huge_pte_alloc+0xd4/0x334
hugetlb_fault+0x1b8/0xc68
handle_mm_fault+0x260/0x29c
do_page_fault+0xfc/0x47c
do_translation_fault+0x68/0x74
do_mem_abort+0x44/0x94
el0_da+0x2c/0x9c
el0t_64_sync_handler+0x70/0xc4
el0t_64_sync+0x190/0x194
Code: aa000084 cb010084 b24c2c84 8b130c93 (f9400260)
---[ end trace 0000000000000000 ]---
Cc: Will Deacon <will@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Fixes:
|
||
Ryan Roberts
|
0e9df1c905 |
arm64: mm: Don't remap pgtables for allocate vs populate
During linear map pgtable creation, each pgtable is fixmapped /
fixunmapped twice; once during allocation to zero the memory, and a
again during population to write the entries. This means each table has
2 TLB invalidations issued against it. Let's fix this so that each table
is only fixmapped/fixunmapped once, halving the number of TLBIs, and
improving performance.
Achieve this by separating allocation and initialization (zeroing) of
the page. The allocated page is now fixmapped directly by the walker and
initialized, before being populated and finally fixunmapped.
This approach keeps the change small, but has the side effect that late
allocations (using __get_free_page()) must also go through the generic
memory clearing routine. So let's tell __get_free_page() not to zero the
memory to avoid duplication.
Additionally this approach means that fixmap/fixunmap is still used for
late pgtable modifications. That's not technically needed since the
memory is all mapped in the linear map by that point. That's left as a
possible future optimization if found to be needed.
Execution time of map_mem(), which creates the kernel linear map page
tables, was measured on different machines with different RAM configs:
| Apple M2 VM | Ampere Altra| Ampere Altra| Ampere Altra
| VM, 16G | VM, 64G | VM, 256G | Metal, 512G
---------------|-------------|-------------|-------------|-------------
| ms (%) | ms (%) | ms (%) | ms (%)
---------------|-------------|-------------|-------------|-------------
before | 11 (0%) | 161 (0%) | 656 (0%) | 1654 (0%)
after | 10 (-11%) | 104 (-35%) | 438 (-33%) | 1223 (-26%)
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Tested-by: Eric Chanudet <echanude@redhat.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240412131908.433043-4-ryan.roberts@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
|
||
|
Ryan Roberts
|
1fcb7cea8a |
arm64: mm: Batch dsb and isb when populating pgtables
After removing uneccessary TLBIs, the next bottleneck when creating the
page tables for the linear map is DSB and ISB, which were previously
issued per-pte in __set_pte(). Since we are writing multiple ptes in a
given pte table, we can elide these barriers and insert them once we
have finished writing to the table.
Execution time of map_mem(), which creates the kernel linear map page
tables, was measured on different machines with different RAM configs:
| Apple M2 VM | Ampere Altra| Ampere Altra| Ampere Altra
| VM, 16G | VM, 64G | VM, 256G | Metal, 512G
---------------|-------------|-------------|-------------|-------------
| ms (%) | ms (%) | ms (%) | ms (%)
---------------|-------------|-------------|-------------|-------------
before | 78 (0%) | 435 (0%) | 1723 (0%) | 3779 (0%)
after | 11 (-86%) | 161 (-63%) | 656 (-62%) | 1654 (-56%)
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Tested-by: Eric Chanudet <echanude@redhat.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240412131908.433043-3-ryan.roberts@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
|
||
|
Ryan Roberts
|
5c63db59c5 |
arm64: mm: Don't remap pgtables per-cont(pte|pmd) block
A large part of the kernel boot time is creating the kernel linear map
page tables. When rodata=full, all memory is mapped by pte. And when
there is lots of physical ram, there are lots of pte tables to populate.
The primary cost associated with this is mapping and unmapping the pte
table memory in the fixmap; at unmap time, the TLB entry must be
invalidated and this is expensive.
Previously, each pmd and pte table was fixmapped/fixunmapped for each
cont(pte|pmd) block of mappings (16 entries with 4K granule). This means
we ended up issuing 32 TLBIs per (pmd|pte) table during the population
phase.
Let's fix that, and fixmap/fixunmap each page once per population, for a
saving of 31 TLBIs per (pmd|pte) table. This gives a significant boot
speedup.
Execution time of map_mem(), which creates the kernel linear map page
tables, was measured on different machines with different RAM configs:
| Apple M2 VM | Ampere Altra| Ampere Altra| Ampere Altra
| VM, 16G | VM, 64G | VM, 256G | Metal, 512G
---------------|-------------|-------------|-------------|-------------
| ms (%) | ms (%) | ms (%) | ms (%)
---------------|-------------|-------------|-------------|-------------
before | 168 (0%) | 2198 (0%) | 8644 (0%) | 17447 (0%)
after | 78 (-53%) | 435 (-80%) | 1723 (-80%) | 3779 (-78%)
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Tested-by: Eric Chanudet <echanude@redhat.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240412131908.433043-2-ryan.roberts@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
|
||
|
Linus Torvalds
|
902861e34c |
- Sumanth Korikkar has taught s390 to allocate hotplug-time page frames
from hotplugged memory rather than only from main memory. Series
"implement "memmap on memory" feature on s390".
- More folio conversions from Matthew Wilcox in the series
"Convert memcontrol charge moving to use folios"
"mm: convert mm counter to take a folio"
- Chengming Zhou has optimized zswap's rbtree locking, providing
significant reductions in system time and modest but measurable
reductions in overall runtimes. The series is "mm/zswap: optimize the
scalability of zswap rb-tree".
- Chengming Zhou has also provided the series "mm/zswap: optimize zswap
lru list" which provides measurable runtime benefits in some
swap-intensive situations.
- And Chengming Zhou further optimizes zswap in the series "mm/zswap:
optimize for dynamic zswap_pools". Measured improvements are modest.
- zswap cleanups and simplifications from Yosry Ahmed in the series "mm:
zswap: simplify zswap_swapoff()".
- In the series "Add DAX ABI for memmap_on_memory", Vishal Verma has
contributed several DAX cleanups as well as adding a sysfs tunable to
control the memmap_on_memory setting when the dax device is hotplugged
as system memory.
- Johannes Weiner has added the large series "mm: zswap: cleanups",
which does that.
- More DAMON work from SeongJae Park in the series
"mm/damon: make DAMON debugfs interface deprecation unignorable"
"selftests/damon: add more tests for core functionalities and corner cases"
"Docs/mm/damon: misc readability improvements"
"mm/damon: let DAMOS feeds and tame/auto-tune itself"
- In the series "mm/mempolicy: weighted interleave mempolicy and sysfs
extension" Rakie Kim has developed a new mempolicy interleaving policy
wherein we allocate memory across nodes in a weighted fashion rather
than uniformly. This is beneficial in heterogeneous memory environments
appearing with CXL.
- Christophe Leroy has contributed some cleanup and consolidation work
against the ARM pagetable dumping code in the series "mm: ptdump:
Refactor CONFIG_DEBUG_WX and check_wx_pages debugfs attribute".
- Luis Chamberlain has added some additional xarray selftesting in the
series "test_xarray: advanced API multi-index tests".
- Muhammad Usama Anjum has reworked the selftest code to make its
human-readable output conform to the TAP ("Test Anything Protocol")
format. Amongst other things, this opens up the use of third-party
tools to parse and process out selftesting results.
- Ryan Roberts has added fork()-time PTE batching of THP ptes in the
series "mm/memory: optimize fork() with PTE-mapped THP". Mainly
targeted at arm64, this significantly speeds up fork() when the process
has a large number of pte-mapped folios.
- David Hildenbrand also gets in on the THP pte batching game in his
series "mm/memory: optimize unmap/zap with PTE-mapped THP". It
implements batching during munmap() and other pte teardown situations.
The microbenchmark improvements are nice.
- And in the series "Transparent Contiguous PTEs for User Mappings" Ryan
Roberts further utilizes arm's pte's contiguous bit ("contpte
mappings"). Kernel build times on arm64 improved nicely. Ryan's series
"Address some contpte nits" provides some followup work.
- In the series "mm/hugetlb: Restore the reservation" Breno Leitao has
fixed an obscure hugetlb race which was causing unnecessary page faults.
He has also added a reproducer under the selftest code.
- In the series "selftests/mm: Output cleanups for the compaction test",
Mark Brown did what the title claims.
- Kinsey Ho has added the series "mm/mglru: code cleanup and refactoring".
- Even more zswap material from Nhat Pham. The series "fix and extend
zswap kselftests" does as claimed.
- In the series "Introduce cpu_dcache_is_aliasing() to fix DAX
regression" Mathieu Desnoyers has cleaned up and fixed rather a mess in
our handling of DAX on archiecctures which have virtually aliasing data
caches. The arm architecture is the main beneficiary.
- Lokesh Gidra's series "per-vma locks in userfaultfd" provides dramatic
improvements in worst-case mmap_lock hold times during certain
userfaultfd operations.
- Some page_owner enhancements and maintenance work from Oscar Salvador
in his series
"page_owner: print stacks and their outstanding allocations"
"page_owner: Fixup and cleanup"
- Uladzislau Rezki has contributed some vmalloc scalability improvements
in his series "Mitigate a vmap lock contention". It realizes a 12x
improvement for a certain microbenchmark.
- Some kexec/crash cleanup work from Baoquan He in the series "Split
crash out from kexec and clean up related config items".
- Some zsmalloc maintenance work from Chengming Zhou in the series
"mm/zsmalloc: fix and optimize objects/page migration"
"mm/zsmalloc: some cleanup for get/set_zspage_mapping()"
- Zi Yan has taught the MM to perform compaction on folios larger than
order=0. This a step along the path to implementaton of the merging of
large anonymous folios. The series is named "Enable >0 order folio
memory compaction".
- Christoph Hellwig has done quite a lot of cleanup work in the
pagecache writeback code in his series "convert write_cache_pages() to
an iterator".
- Some modest hugetlb cleanups and speedups in Vishal Moola's series
"Handle hugetlb faults under the VMA lock".
- Zi Yan has changed the page splitting code so we can split huge pages
into sizes other than order-0 to better utilize large folios. The
series is named "Split a folio to any lower order folios".
- David Hildenbrand has contributed the series "mm: remove
total_mapcount()", a cleanup.
- Matthew Wilcox has sought to improve the performance of bulk memory
freeing in his series "Rearrange batched folio freeing".
- Gang Li's series "hugetlb: parallelize hugetlb page init on boot"
provides large improvements in bootup times on large machines which are
configured to use large numbers of hugetlb pages.
- Matthew Wilcox's series "PageFlags cleanups" does that.
- Qi Zheng's series "minor fixes and supplement for ptdesc" does that
also. S390 is affected.
- Cleanups to our pagemap utility functions from Peter Xu in his series
"mm/treewide: Replace pXd_large() with pXd_leaf()".
- Nico Pache has fixed a few things with our hugepage selftests in his
series "selftests/mm: Improve Hugepage Test Handling in MM Selftests".
- Also, of course, many singleton patches to many things. Please see
the individual changelogs for details.
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Merge tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- Sumanth Korikkar has taught s390 to allocate hotplug-time page frames
from hotplugged memory rather than only from main memory. Series
"implement "memmap on memory" feature on s390".
- More folio conversions from Matthew Wilcox in the series
"Convert memcontrol charge moving to use folios"
"mm: convert mm counter to take a folio"
- Chengming Zhou has optimized zswap's rbtree locking, providing
significant reductions in system time and modest but measurable
reductions in overall runtimes. The series is "mm/zswap: optimize the
scalability of zswap rb-tree".
- Chengming Zhou has also provided the series "mm/zswap: optimize zswap
lru list" which provides measurable runtime benefits in some
swap-intensive situations.
- And Chengming Zhou further optimizes zswap in the series "mm/zswap:
optimize for dynamic zswap_pools". Measured improvements are modest.
- zswap cleanups and simplifications from Yosry Ahmed in the series
"mm: zswap: simplify zswap_swapoff()".
- In the series "Add DAX ABI for memmap_on_memory", Vishal Verma has
contributed several DAX cleanups as well as adding a sysfs tunable to
control the memmap_on_memory setting when the dax device is
hotplugged as system memory.
- Johannes Weiner has added the large series "mm: zswap: cleanups",
which does that.
- More DAMON work from SeongJae Park in the series
"mm/damon: make DAMON debugfs interface deprecation unignorable"
"selftests/damon: add more tests for core functionalities and corner cases"
"Docs/mm/damon: misc readability improvements"
"mm/damon: let DAMOS feeds and tame/auto-tune itself"
- In the series "mm/mempolicy: weighted interleave mempolicy and sysfs
extension" Rakie Kim has developed a new mempolicy interleaving
policy wherein we allocate memory across nodes in a weighted fashion
rather than uniformly. This is beneficial in heterogeneous memory
environments appearing with CXL.
- Christophe Leroy has contributed some cleanup and consolidation work
against the ARM pagetable dumping code in the series "mm: ptdump:
Refactor CONFIG_DEBUG_WX and check_wx_pages debugfs attribute".
- Luis Chamberlain has added some additional xarray selftesting in the
series "test_xarray: advanced API multi-index tests".
- Muhammad Usama Anjum has reworked the selftest code to make its
human-readable output conform to the TAP ("Test Anything Protocol")
format. Amongst other things, this opens up the use of third-party
tools to parse and process out selftesting results.
- Ryan Roberts has added fork()-time PTE batching of THP ptes in the
series "mm/memory: optimize fork() with PTE-mapped THP". Mainly
targeted at arm64, this significantly speeds up fork() when the
process has a large number of pte-mapped folios.
- David Hildenbrand also gets in on the THP pte batching game in his
series "mm/memory: optimize unmap/zap with PTE-mapped THP". It
implements batching during munmap() and other pte teardown
situations. The microbenchmark improvements are nice.
- And in the series "Transparent Contiguous PTEs for User Mappings"
Ryan Roberts further utilizes arm's pte's contiguous bit ("contpte
mappings"). Kernel build times on arm64 improved nicely. Ryan's
series "Address some contpte nits" provides some followup work.
- In the series "mm/hugetlb: Restore the reservation" Breno Leitao has
fixed an obscure hugetlb race which was causing unnecessary page
faults. He has also added a reproducer under the selftest code.
- In the series "selftests/mm: Output cleanups for the compaction
test", Mark Brown did what the title claims.
- Kinsey Ho has added the series "mm/mglru: code cleanup and
refactoring".
- Even more zswap material from Nhat Pham. The series "fix and extend
zswap kselftests" does as claimed.
- In the series "Introduce cpu_dcache_is_aliasing() to fix DAX
regression" Mathieu Desnoyers has cleaned up and fixed rather a mess
in our handling of DAX on archiecctures which have virtually aliasing
data caches. The arm architecture is the main beneficiary.
- Lokesh Gidra's series "per-vma locks in userfaultfd" provides
dramatic improvements in worst-case mmap_lock hold times during
certain userfaultfd operations.
- Some page_owner enhancements and maintenance work from Oscar Salvador
in his series
"page_owner: print stacks and their outstanding allocations"
"page_owner: Fixup and cleanup"
- Uladzislau Rezki has contributed some vmalloc scalability
improvements in his series "Mitigate a vmap lock contention". It
realizes a 12x improvement for a certain microbenchmark.
- Some kexec/crash cleanup work from Baoquan He in the series "Split
crash out from kexec and clean up related config items".
- Some zsmalloc maintenance work from Chengming Zhou in the series
"mm/zsmalloc: fix and optimize objects/page migration"
"mm/zsmalloc: some cleanup for get/set_zspage_mapping()"
- Zi Yan has taught the MM to perform compaction on folios larger than
order=0. This a step along the path to implementaton of the merging
of large anonymous folios. The series is named "Enable >0 order folio
memory compaction".
- Christoph Hellwig has done quite a lot of cleanup work in the
pagecache writeback code in his series "convert write_cache_pages()
to an iterator".
- Some modest hugetlb cleanups and speedups in Vishal Moola's series
"Handle hugetlb faults under the VMA lock".
- Zi Yan has changed the page splitting code so we can split huge pages
into sizes other than order-0 to better utilize large folios. The
series is named "Split a folio to any lower order folios".
- David Hildenbrand has contributed the series "mm: remove
total_mapcount()", a cleanup.
- Matthew Wilcox has sought to improve the performance of bulk memory
freeing in his series "Rearrange batched folio freeing".
- Gang Li's series "hugetlb: parallelize hugetlb page init on boot"
provides large improvements in bootup times on large machines which
are configured to use large numbers of hugetlb pages.
- Matthew Wilcox's series "PageFlags cleanups" does that.
- Qi Zheng's series "minor fixes and supplement for ptdesc" does that
also. S390 is affected.
- Cleanups to our pagemap utility functions from Peter Xu in his series
"mm/treewide: Replace pXd_large() with pXd_leaf()".
- Nico Pache has fixed a few things with our hugepage selftests in his
series "selftests/mm: Improve Hugepage Test Handling in MM
Selftests".
- Also, of course, many singleton patches to many things. Please see
the individual changelogs for details.
* tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (435 commits)
mm/zswap: remove the memcpy if acomp is not sleepable
crypto: introduce: acomp_is_async to expose if comp drivers might sleep
memtest: use {READ,WRITE}_ONCE in memory scanning
mm: prohibit the last subpage from reusing the entire large folio
mm: recover pud_leaf() definitions in nopmd case
selftests/mm: skip the hugetlb-madvise tests on unmet hugepage requirements
selftests/mm: skip uffd hugetlb tests with insufficient hugepages
selftests/mm: dont fail testsuite due to a lack of hugepages
mm/huge_memory: skip invalid debugfs new_order input for folio split
mm/huge_memory: check new folio order when split a folio
mm, vmscan: retry kswapd's priority loop with cache_trim_mode off on failure
mm: add an explicit smp_wmb() to UFFDIO_CONTINUE
mm: fix list corruption in put_pages_list
mm: remove folio from deferred split list before uncharging it
filemap: avoid unnecessary major faults in filemap_fault()
mm,page_owner: drop unnecessary check
mm,page_owner: check for null stack_record before bumping its refcount
mm: swap: fix race between free_swap_and_cache() and swapoff()
mm/treewide: align up pXd_leaf() retval across archs
mm/treewide: drop pXd_large()
...
|
||
Catalin Marinas
|
69ebc01824 |
Revert "arm64: mm: add support for WXN memory translation attribute"
This reverts commit
|
||
|
Ryan Roberts
|
94c18d5f7e |
arm64/mm: improve comment in contpte_ptep_get_lockless()
Make clear the atmicity/consistency requirements of the API and how we achieve them. Link: https://lore.kernel.org/linux-mm/Zc-Tqqfksho3BHmU@arm.com/ Link: https://lkml.kernel.org/r/20240226120321.1055731-3-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Ryan Roberts
|
912609e96c |
arm64/mm: export contpte symbols only to GPL users
Patch series "Address some contpte nits". These 2 patches address some nits raised by Catalin late in the review cycle for my contpte series [1]. [1] https://lore.kernel.org/linux-mm/20240215103205.2607016-1-ryan.roberts@arm.com/ This patch (of 2): The contpte symbols must be exported since some of the public inline ptep_* APIs are called from modules and these inlines now call the contpte functions. Originally they were exported as EXPORT_SYMBOL() for fear of breaking out-of-tree modules. But we subsequently concluded that EXPORT_SYMBOL_GPL() should be safe since these functions are deeply core mm routines, and any module operating at this level is not going to be able to survive on EXPORT_SYMBOL alone. Link: https://lkml.kernel.org/r/20240226120321.1055731-1-ryan.roberts@arm.com Link: https://lore.kernel.org/linux-mm/f9fc2b31-11cb-4969-8961-9c89fea41b74@nvidia.com/ Link: https://lkml.kernel.org/r/20240226120321.1055731-2-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Ard Biesheuvel
|
27f2b9fcdd |
arm64/mm: Avoid ID mapping of kpti flag if it is no longer needed
arm64_use_ng_mappings will be set to 'true' by the early boot code if it decides to use non-global (nG) attributes for all kernel mappings, typically when enabling KASLR on a system that does not implement E0PD. In this case, the G-to-nG update routines are never called, and so there is no reason to create the writable mapping of the associated status flag in the ID map. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240301104046.1234309-6-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
||
Baoquan He
|
40254101d8 |
arm64, crash: wrap crash dumping code into crash related ifdefs
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 <bhe@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Hari Bathini <hbathini@linux.ibm.com> Cc: Pingfan Liu <piliu@redhat.com> Cc: Klara Modin <klarasmodin@gmail.com> Cc: Michael Kelley <mhklinux@outlook.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Yang Li <yang.lee@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Ryan Roberts
|
f0c2264958 |
arm64/mm: automatically fold contpte mappings
There are situations where a change to a single PTE could cause the contpte block in which it resides to become foldable (i.e. could be repainted with the contiguous bit). Such situations arise, for example, when user space temporarily changes protections, via mprotect, for individual pages, such can be the case for certain garbage collectors. We would like to detect when such a PTE change occurs. However this can be expensive due to the amount of checking required. Therefore only perform the checks when an indiviual PTE is modified via mprotect (ptep_modify_prot_commit() -> set_pte_at() -> set_ptes(nr=1)) and only when we are setting the final PTE in a contpte-aligned block. Link: https://lkml.kernel.org/r/20240215103205.2607016-19-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ryan Roberts
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6b1e4efb6f |
arm64/mm: implement new [get_and_]clear_full_ptes() batch APIs
Optimize the contpte implementation to fix some of the exit/munmap/dontneed performance regression introduced by the initial contpte commit. Subsequent patches will solve it entirely. During exit(), munmap() or madvise(MADV_DONTNEED), mappings must be cleared. Previously this was done 1 PTE at a time. But the core-mm supports batched clear via the new [get_and_]clear_full_ptes() APIs. So let's implement those APIs and for fully covered contpte mappings, we no longer need to unfold the contpte. This significantly reduces unfolding operations, reducing the number of tlbis that must be issued. Link: https://lkml.kernel.org/r/20240215103205.2607016-15-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Tested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ryan Roberts
|
311a6cf296 |
arm64/mm: implement new wrprotect_ptes() batch API
Optimize the contpte implementation to fix some of the fork performance
regression introduced by the initial contpte commit. Subsequent patches
will solve it entirely.
During fork(), any private memory in the parent must be write-protected.
Previously this was done 1 PTE at a time. But the core-mm supports
batched wrprotect via the new wrprotect_ptes() API. So let's implement
that API and for fully covered contpte mappings, we no longer need to
unfold the contpte. This has 2 benefits:
- reduced unfolding, reduces the number of tlbis that must be issued.
- The memory remains contpte-mapped ("folded") in the parent, so it
continues to benefit from the more efficient use of the TLB after
the fork.
The optimization to wrprotect a whole contpte block without unfolding is
possible thanks to the tightening of the Arm ARM in respect to the
definition and behaviour when 'Misprogramming the Contiguous bit'. See
section D21194 at https://developer.arm.com/documentation/102105/ja-07/
Link: https://lkml.kernel.org/r/20240215103205.2607016-14-ryan.roberts@arm.com
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Barry Song <21cnbao@gmail.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Ryan Roberts
|
4602e5757b |
arm64/mm: wire up PTE_CONT for user mappings
With the ptep API sufficiently refactored, we can now introduce a new "contpte" API layer, which transparently manages the PTE_CONT bit for user mappings. In this initial implementation, only suitable batches of PTEs, set via set_ptes(), are mapped with the PTE_CONT bit. Any subsequent modification of individual PTEs will cause an "unfold" operation to repaint the contpte block as individual PTEs before performing the requested operation. While, a modification of a single PTE could cause the block of PTEs to which it belongs to become eligible for "folding" into a contpte entry, "folding" is not performed in this initial implementation due to the costs of checking the requirements are met. Due to this, contpte mappings will degrade back to normal pte mappings over time if/when protections are changed. This will be solved in a future patch. Since a contpte block only has a single access and dirty bit, the semantic here changes slightly; when getting a pte (e.g. ptep_get()) that is part of a contpte mapping, the access and dirty information are pulled from the block (so all ptes in the block return the same access/dirty info). When changing the access/dirty info on a pte (e.g. ptep_set_access_flags()) that is part of a contpte mapping, this change will affect the whole contpte block. This is works fine in practice since we guarantee that only a single folio is mapped by a contpte block, and the core-mm tracks access/dirty information per folio. In order for the public functions, which used to be pure inline, to continue to be callable by modules, export all the contpte_* symbols that are now called by those public inline functions. The feature is enabled/disabled with the ARM64_CONTPTE Kconfig parameter at build time. It defaults to enabled as long as its dependency, TRANSPARENT_HUGEPAGE is also enabled. The core-mm depends upon TRANSPARENT_HUGEPAGE to be able to allocate large folios, so if its not enabled, then there is no chance of meeting the physical contiguity requirement for contpte mappings. Link: https://lkml.kernel.org/r/20240215103205.2607016-13-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ryan Roberts
|
5a00bfd6a5 |
arm64/mm: new ptep layer to manage contig bit
Create a new layer for the in-table PTE manipulation APIs. For now, The existing API is prefixed with double underscore to become the arch-private API and the public API is just a simple wrapper that calls the private API. The public API implementation will subsequently be used to transparently manipulate the contiguous bit where appropriate. But since there are already some contig-aware users (e.g. hugetlb, kernel mapper), we must first ensure those users use the private API directly so that the future contig-bit manipulations in the public API do not interfere with those existing uses. The following APIs are treated this way: - ptep_get - set_pte - set_ptes - pte_clear - ptep_get_and_clear - ptep_test_and_clear_young - ptep_clear_flush_young - ptep_set_wrprotect - ptep_set_access_flags Link: https://lkml.kernel.org/r/20240215103205.2607016-11-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Tested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ryan Roberts
|
cbb0294fdd |
arm64/mm: convert ptep_clear() to ptep_get_and_clear()
ptep_clear() is a generic wrapper around the arch-implemented ptep_get_and_clear(). We are about to convert ptep_get_and_clear() into a public version and private version (__ptep_get_and_clear()) to support the transparent contpte work. We won't have a private version of ptep_clear() so let's convert it to directly call ptep_get_and_clear(). Link: https://lkml.kernel.org/r/20240215103205.2607016-10-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Tested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ryan Roberts
|
659e193027 |
arm64/mm: convert set_pte_at() to set_ptes(..., 1)
Since set_ptes() was introduced, set_pte_at() has been implemented as a generic macro around set_ptes(..., 1). So this change should continue to generate the same code. However, making this change prepares us for the transparent contpte support. It means we can reroute set_ptes() to __set_ptes(). Since set_pte_at() is a generic macro, there will be no equivalent __set_pte_at() to reroute to. Note that a couple of calls to set_pte_at() remain in the arch code. This is intentional, since those call sites are acting on behalf of core-mm and should continue to call into the public set_ptes() rather than the arch-private __set_ptes(). Link: https://lkml.kernel.org/r/20240215103205.2607016-9-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Tested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ryan Roberts
|
532736558e |
arm64/mm: convert READ_ONCE(*ptep) to ptep_get(ptep)
There are a number of places in the arch code that read a pte by using the READ_ONCE() macro. Refactor these call sites to instead use the ptep_get() helper, which itself is a READ_ONCE(). Generated code should be the same. This will benefit us when we shortly introduce the transparent contpte support. In this case, ptep_get() will become more complex so we now have all the code abstracted through it. Link: https://lkml.kernel.org/r/20240215103205.2607016-8-ryan.roberts@arm.com Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Tested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Barry Song <21cnbao@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Morse <james.morse@arm.com> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Anshuman Khandual
|
ce70cfb145 |
mm/hugetlb: move page order check inside hugetlb_cma_reserve()
All platforms could benefit from page order check against MAX_PAGE_ORDER before allocating a CMA area for gigantic hugetlb pages. Let's move this check from individual platforms to generic hugetlb. Link: https://lkml.kernel.org/r/20240209054221.1403364-1-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: Jane Chu <jane.chu@oracle.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Christophe Leroy
|
6cdc82db0c |
mm: ptdump: have ptdump_check_wx() return bool
Have ptdump_check_wx() return true when the check is successful or false otherwise. [akpm@linux-foundation.org: fix a couple of build issues (x86_64 allmodconfig)] Link: https://lkml.kernel.org/r/7943149fe955458cb7b57cd483bf41a3aad94684.1706610398.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Greg KH <greg@kroah.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Phong Tran <tranmanphong@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Steven Price <steven.price@arm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Christophe Leroy
|
a5e8131a03 |
arm64, powerpc, riscv, s390, x86: ptdump: refactor CONFIG_DEBUG_WX
All architectures using the core ptdump functionality also implement CONFIG_DEBUG_WX, and they all do it more or less the same way, with a function called debug_checkwx() that is called by mark_rodata_ro(), which is a substitute to ptdump_check_wx() when CONFIG_DEBUG_WX is set and a no-op otherwise. Refactor by centrally defining debug_checkwx() in linux/ptdump.h and call debug_checkwx() immediately after calling mark_rodata_ro() instead of calling it at the end of every mark_rodata_ro(). On x86_32, mark_rodata_ro() first checks __supported_pte_mask has _PAGE_NX before calling debug_checkwx(). Now the check is inside the callee ptdump_walk_pgd_level_checkwx(). On powerpc_64, mark_rodata_ro() bails out early before calling ptdump_check_wx() when the MMU doesn't have KERNEL_RO feature. The check is now also done in ptdump_check_wx() as it is called outside mark_rodata_ro(). Link: https://lkml.kernel.org/r/a59b102d7964261d31ead0316a9f18628e4e7a8e.1706610398.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Greg KH <greg@kroah.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Phong Tran <tranmanphong@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Steven Price <steven.price@arm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Ard Biesheuvel
|
50e3ed0f93 |
arm64: mm: add support for WXN memory translation attribute
The AArch64 virtual memory system supports a global WXN control, which can be enabled to make all writable mappings implicitly no-exec. This is a useful hardening feature, as it prevents mistakes in managing page table permissions from being exploited to attack the system. When enabled at EL1, the restrictions apply to both EL1 and EL0. EL1 is completely under our control, and has been cleaned up to allow WXN to be enabled from boot onwards. EL0 is not under our control, but given that widely deployed security features such as selinux or PaX already limit the ability of user space to create mappings that are writable and executable at the same time, the impact of enabling this for EL0 is expected to be limited. (For this reason, common user space libraries that have a legitimate need for manipulating executable code already carry fallbacks such as [0].) If enabled at compile time, the feature can still be disabled at boot if needed, by passing arm64.nowxn on the kernel command line. [0] https://github.com/libffi/libffi/blob/master/src/closures.c#L440 Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20240214122845.2033971-88-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Ard Biesheuvel
|
d40900fcb3 |
arm64: ptdump: Deal with translation levels folded at runtime
Currently, the ptdump code deals with folded PMD or PUD levels at build time, by omitting those levels when invoking note_page. IOW, note_page() is never invoked with level == 1 if P4Ds are folded in the build configuration. With the introduction of LPA2 support, we will defer some of these folding decisions to runtime, so let's take care of this by overriding the 'level' argument when this condition triggers. Substituting the PUD or PMD strings for "PGD" when the level in question is folded at build time is no longer necessary, and so the conditional expressions can be simplified. This also makes the indirection of the 'name' field unnecessary, so change that into a char[] array, and make the whole thing __ro_after_init. Note that the mm_p?d_folded() functions currently ignore their mm pointer arguments, but let's wire them up correctly anyway. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-83-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Ard Biesheuvel
|
16f22981b6 |
arm64: ptdump: Disregard unaddressable VA space
Configurations built with support for 52-bit virtual addressing can also run on CPUs that only support 48 bits of VA space, in which case only that part of swapper_pg_dir that represents the 48-bit addressable region is relevant, and everything else is ignored by the hardware. Our software pagetable walker has little in the way of input address validation, and so it will happily start a walk from an address that is not representable by the number of paging levels that are actually active, resulting in lots of bogus output from the page table dumper unless we take care to start at a valid address. So define the start address at runtime based on vabits_actual. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-82-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Ard Biesheuvel
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0dd4f60a2c |
arm64: mm: Add support for folding PUDs at runtime
In order to support LPA2 on 16k pages in a way that permits non-LPA2 systems to run the same kernel image, we have to be able to fall back to at most 48 bits of virtual addressing. Falling back to 48 bits would result in a level 0 with only 2 entries, which is suboptimal in terms of TLB utilization. So instead, let's fall back to 47 bits in that case. This means we need to be able to fold PUDs dynamically, similar to how we fold P4Ds for 48 bit virtual addressing on LPA2 with 4k pages. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-81-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Ard Biesheuvel
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0383808e4d |
arm64: kasan: Reduce minimum shadow alignment and enable 5 level paging
Allow the KASAN init code to deal with 5 levels of paging, and relax the requirement that the shadow region is aligned to the top level pgd_t size. This is necessary for LPA2 based 52-bit virtual addressing, where the KASAN shadow will never be aligned to the pgd_t size. Allowing this also enables the 16k/48-bit case for KASAN, which is a nice bonus. This involves some hackery to manipulate the root and next level page tables without having to distinguish all the various configurations, including 16k/48-bits (which has a two entry pgd_t level), and LPA2 configurations running with one translation level less on non-LPA2 hardware. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-80-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Ard Biesheuvel
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6ed8a3a094 |
arm64: mm: Add 5 level paging support to fixmap and swapper handling
Add support for using 5 levels of paging in the fixmap, as well as in the kernel page table handling code which uses fixmaps internally. This also handles the case where a 5 level build runs on hardware that only supports 4 levels of paging. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-79-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Ard Biesheuvel
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9684ec186f |
arm64: Enable LPA2 at boot if supported by the system
Update the early kernel mapping code to take 52-bit virtual addressing into account based on the LPA2 feature. This is a bit more involved than LVA (which is supported with 64k pages only), given that some page table descriptor bits change meaning in this case. To keep the handling in asm to a minimum, the initial ID map is still created with 48-bit virtual addressing, which implies that the kernel image must be loaded into 48-bit addressable physical memory. This is currently required by the boot protocol, even though we happen to support placement outside of that for LVA/64k based configurations. Enabling LPA2 involves more than setting TCR.T1SZ to a lower value, there is also a DS bit in TCR that needs to be set, and which changes the meaning of bits [9:8] in all page table descriptors. Since we cannot enable DS and every live page table descriptor at the same time, let's pivot through another temporary mapping. This avoids the need to reintroduce manipulations of the page tables with the MMU and caches disabled. To permit the LPA2 feature to be overridden on the kernel command line, which may be necessary to work around silicon errata, or to deal with mismatched features on heterogeneous SoC designs, test for CPU feature overrides first, and only then enable LPA2. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-78-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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Ard Biesheuvel
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2b6c8f96cc |
arm64: mm: add LPA2 and 5 level paging support to G-to-nG conversion
Add support for 5 level paging in the G-to-nG routine that creates its own temporary page tables to traverse the swapper page tables. Also add support for running the 5 level configuration with the top level folded at runtime, to support CPUs that do not implement the LPA2 extension. While at it, wire up the level skipping logic so it will also trigger on 4 level configurations with LPA2 enabled at build time but not active at runtime, as we'll fall back to 3 level paging in that case. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-77-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |