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# Conflicts:
# net/ceph/osd_client.c
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https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
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https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
# Conflicts:
# init/main.c
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https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
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# New commits in sched/core:
e81ee0630837 ("sched/fair: Reset NUMA fault locality after scan period update")
ef9293b3b797 ("sched: dynamic: Fix preemption model strings")
879eaa76e608 ("sched: Remove unneeded function type cast in do_balance_callbacks()")
f549101187c8 ("sched/deadline: check start_dl_timer expiry with ktime_before()")
2a672daa4b27 ("sched/feat: Use the new static key API for sched_feat")
a5576ebce920 ("sched: Convert paravirt_steal to new static key APIs")
9650ce11f2e3 ("sched: dynamic: Simplify preempt model accessors")
5b9a28eeed37 ("sched: dynamic: Remove HAVE_PREEMPT_DYNAMIC_{CALL,KEY}")
aa4178f63847 ("sched: dynamic: Simplify irqentry_exit_cond_resched()")
b9d267b9d632 ("sched: dynamic: Simplify preempt_schedule{,_notrace}()")
88e0b3bb9930 ("sched: dynamic: Simplify {cond,might}_resched()")
d3d16750693b ("sched: dynamic: Make PREEMPT_DYNAMIC depend on ARCH_HAS_PREEMPT_LAZY")
772d9ffbfd26 ("sched: Migrate whole chain in proxy_migrate_task()")
6b73a09e943f ("sched: Break out core of attach_tasks() helper into sched.h")
1f8805138593 ("sched: Switch rq->next_class in proxy_reset_donor()")
09351db90a28 ("sched/core: Don't proxy-exec unmatched cookie lock owners")
9be817f991e2 ("sched/core: Avoid migrating blocked_on tasks")
3dd95f077371 ("sched/core: Don't steal a proxy-exec donor")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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# New commits in perf/core:
68aca309e49c ("perf/x86/intel: Add sanity check for PEBS record/fragment size")
c34db2f95094 ("perf/x86: Activate back-to-back NMI detection for arch-PEBS induced NMIs")
00cf8daabe2b ("perf/x86/intel: Advertise PERF_PMU_CAP_SIMD_REGS capability")
c4fabb67a47f ("perf/x86/intel: Support arch-PEBS based SIMD/eGPRs sampling")
098cdd582a9b ("perf/x86: Support SSP sampling using sample_regs_* fields")
578460d9af8d ("perf/x86: Support eGPRs sampling using sample_regs_* fields")
a2c64c74c029 ("perf: Enhance perf_reg_validate() with simd_enabled argument")
74d55a827e31 ("perf/x86: Support OPMASK sampling using sample_simd_pred_reg_* fields")
3807f6996a0b ("perf/x86: Support ZMM sampling using sample_simd_vec_reg_* fields")
b76210d32147 ("perf/x86: Support YMM sampling using sample_simd_vec_reg_* fields")
e9d76ada769c ("perf/x86: Support XMM sampling using sample_simd_vec_reg_* fields")
918b7d6d1729 ("perf: Add sampling support for SIMD registers")
edd9aec51213 ("perf/x86: Enable XMM register sampling for REGS_USER case")
b84c96283684 ("perf/x86: Enable XMM register sampling for non-PEBS events")
c09466807467 ("perf/x86/intel: Centralize PERF_PMU_CAP_EXTENDED_REGS updates")
05fe8825796e ("perf: Move and enhance has_extended_regs() for arch-specific use")
450d73dc5f91 ("x86/fpu: Add update_fpu_state_and_flag() helper")
03b89c9f202e ("x86/fpu/xstate: Add xsaves_nmi() helper")
9c05620b4971 ("perf/x86: Use x86_perf_regs in NMI handlers")
cb388bd530cc ("perf: Eliminate duplicate arch-specific function definitions")
bbdf84fcedfa ("perf/x86/intel: Convert x86_perf_regs to per-cpu variables")
62e074f55f41 ("perf/x86/intel: Enable large PEBS sampling for XMMs")
9106892e27ca ("perf/x86: Move hybrid PMU initialization before x86_pmu_starting_cpu()")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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mm-unstable into for-next
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
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Currently, s390 has the ability to configure the maximum kernel command
line size via Kconfig (CONFIG_COMMAND_LINE_SIZE). Other architectures
define a hardcoded COMMAND_LINE_SIZE macro in their setup.h headers.
In some use cases, such as netboot kernels, rootfs configurations, or
larger initramfs setups, a larger command line size is required. While
for embedded workloads, it can be reduced to save memory.
Move CONFIG_COMMAND_LINE_SIZE out of arch/s390/Kconfig and into
init/Kconfig under General setup, and update every architecture's setup.h
header to define COMMAND_LINE_SIZE as CONFIG_COMMAND_LINE_SIZE.
For user-space API (uapi) headers, wrap the definition in an `#ifdef
__KERNEL__` guard and retain the historical hardcoded default in the
`#else` block. When user-space headers are installed via `make
headers_install`, unifdef strips out the kernel section, ensuring the same
value as before for user-space applications including `<asm/setup.h>`.
For S390, the range is kept the same, but other architectures have varying
constraints. S390 requires a minimum of 896 bytes to protect legacy
bootloaders from overwriting the .text section. ARM, M68K, and NIOS2
allocate the command line directly on severely constrained decompressor
stacks, so their ranges are strictly capped at 2048 bytes to prevent
deterministic stack exhaustion and boot panics. PowerPC (PPC) boot
wrappers silently truncate arguments past 2048 bytes, so it is also capped
at 2048 to prevent silent parameter loss.
The SuperH (SUPERH) boot parameter page allocates exactly PAGE_SIZE
(typically 4096 bytes), and placing a 4096-byte command line starting at
offset 256 would cause strscpy() to read out of bounds; it is capped at
3840 bytes. Alpha physically limits its boot parameter block to 256
bytes, so its limit is strictly locked to 256. All other architectures
are capped at 4096 bytes to prevent unreasonable allocations.
Link: https://lore.kernel.org/20260818231646.804507-2-wfelipe@google.com
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Wilson Felipe Pereira <wfelipe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
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The device DAX vmemmap population still reserves one extra tail vmemmap
page after the head page.
Drop that extra reservation and let the shared tail page cover all tail
vmemmap pages after the head page, so DAX follows the same reservation
model as HugeTLB.
This reduces the reserved vmemmap pages for optimized DAX mappings to one
and removes the now-unneeded first-tail population from the generic and
powerpc paths to simplify the code as well.
Link: https://lore.kernel.org/20260911050228.58884-10-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Qi Zheng <qi.zheng@linux.dev>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
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The powerpc radix compound vmemmap population path still finds a reusable
tail page by walking the vmemmap page tables.
Switch it to the common vmemmap_shared_tail_page() helper instead, so it
can use the shared vmemmap page directly to simplify the code.
This removes the powerpc-specific tail-page lookup and its fallback path
and aligns the device DAX vmemmap optimization path with HugeTLB.
Link: https://lore.kernel.org/20260911050228.58884-9-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Qi Zheng <qi.zheng@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
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Now every architecture has been converted to support
CONFIG_MMU_GATHER_RCU_TABLE_FREE, this configuration option no longer
makes any sense to keep around.
Therefore remove it, and remove all the dead code that existed for
!CONFIG_MMU_GATHER_RCU_TABLE_FREE architectures previously.
Additionally, CONFIG_MMU_GATHER_TABLE_FREE is no longer necessary, as all
architectures instead use CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE when a custom
__tlb_remove_table() is required, so remove this too.
A number of architectures only enabled CONFIG_MMU_GATHER_RCU_TABLE_FREE if
CONFIG_MMU was set, however the mmu_gather logic only actually does
something meaningful if CONFIG_MMU is set (mmu_gather.c is only compiled
in this case, for instance).
As a result, there's no need to gate any of this logic on CONFIG_MMU
explicitly.
CONFIG_PT_RECLAIM however does have a strict dependency on CONFIG_MMU, so
make this dependency explicit.
Additionally, correct comments to remove references to non-RCU page table
gathering and make it clear that this is not 'semi-RCU', nor has it been
since commit 1fb3d8c20bfa ("mm/mmu_gather: replace IPI with
synchronize_rcu() when batch allocation fails").
With this change in place the kernel policy is now that all page tables
are freed after an RCU grace period, and thus it is now safe to
unconditionally perform page table walks under RCU, safe in the knowledge
that page tables will not be freed underneath the walker.
This is all that is guaranteed, however, so naturally it is still
incumbent upon page table walkers to ensure that the page table entries
are as expected.
Link: https://lore.kernel.org/20260908-rcu-pagetable-freeing-v2-11-1f60b64e878e@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christian Zankel <chris@zankel.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Bottomley <james.bottomley@HansenPartnership.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Magnus Lindholm <linmag7@gmail.com>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Zi Yan <ziy@nvidia.com>
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There are no more users left for any pxd_ERROR() either in generic MM or
in the platform MM. Hence all these platform macros along with their
generic fallback could be dropped across the tree.
Link: https://lore.kernel.org/20260831054331.625505-9-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: James Bottomley <james.bottomley@HansenPartnership.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Samuel Holland <samuel.holland@sifive.com>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
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Patch series "mm: Unconditional per-VMA locks and cleanups", v7.
tl;dr: Make per-VMA locks available in all configs. Simplify some of the
per-VMA lock users now that they can rely on them being always available.
Binder and networking folks: Your code is the target of the cleanups. I'm
cc'ing you now on v2 because there's emerging consensus on the mm side
that the approach here is sane. I'm not quite sure how this pile would
get merged, but ack/review tags would be appreciated if this looks good to
you.
Longer version:
When working on some x86 shadow stack code, it was a real pain to avoid
causing recursive locking problems with mmap_lock. One way to avoid those
was to avoid mmap_lock and use per-VMA locks instead. They are great, but
they are not available in all configs which makes them unusable in generic
code, or if you want to completely avoid mmap_lock.
Make per-VMA locks available in all configs. Right now, they are only
available on select architectures when SMP and MMU are enabled. But all
of the primitives that per-VMA locks are built on (RCU, maple trees,
refcounts) work just fine without SMP or MMU.
The only real downside is that making VMAs a wee bit bigger on !MMU and
!SMP builds.
The upside is much cleaner code, lower complexity and less #ifdeffery.
Clean up a binder VMA locking site now that it can rely on per-VMA locks.
Building on top of universally-available per-VMA locks, introduce a new
helper. Since the new API does not require callers to have a fallback to
mmap_lock, it's much easier to use. Callers can potentially replace this
very common kernel idiom:
mmap_read_lock(mm);
vma = vma_lookup()
// fiddle with vma
mmap_read_unlock(mm);
with:
vma = vma_start_read_unlocked(mm, address);
// fiddle with vma
vma_end_read(vma);
Which avoids mmap_lock entirely in the fast path.
Use that new API for another binder site and one in the TCP code.
This patch (of 7):
The per-VMA locks have been around for several years. They've had some
bugs worked out of them and have seen quite wide use. However, they are
still only available when architectures explicitly enable them. Remove
the conditional compilation around the per-VMA locks, making them
available on all architectures and configs.
The approach up to now seemed to be to add ARCH_SUPPORTS_PER_VMA_LOCK when
the architecture started using per-VMA locks in the fault handler. But,
contrary to the naming, the Kconfig option does not really indicate
whether the architecture supports per-VMA locks or not. It is more of a
marker for whether the architecture is likely to benefit from per-VMA
locks.
To me, the most important thing side-effect of universal availability is
letting per-VMA locks be used in SMP=n configs. This lets us use
per-VMA locking in all x86 code without fallbacks.
Overall, this just generally makes the kernel simpler. Just look at the
diffstat. It also opens the door to users that want to use the per-VMA
locks in common code. Doing *that* brings additional simplifications.
The downside of this is adding some fields to vm_area_struct and
mm_struct. There are likely ways to optimize this, especially for things
like SMP=n configs. For now, do the simplest thing: use the same
implementation everywhere.
== Considerations for NOMMU config ==
NOMMU systems do not write-lock VMAs, therefore read-locking a VMA would
always succeed unless VMA is detached. Therefore for NOMMU config we make
vma_mark_attached() a NOOP, which keeps VMAs always in detached state.
This causes VMA read-locking to always fail and the caller falls back to
locking mmap_lock.
The following functions will have a different implementation in NOMMU
config:
- vma_mark_attached(), vma_mark_detached() are made NOOPs, keeping VMAs
always in a detached state and preventing assertions and refcount
underflows;
- vma_start_write(), vma_start_write_killable() are made NOOPs to avoid
warnings in __vma_start_write() due to VMAs being detached. These
functions are not used in NOMMU code but __vma_start_write() is an
exported function, therefore might be used by drivers.
- vma_assert_attached() is made NOOP because it's reachable from NOMMU
code via split_vma()->vma_iter_store_new()->vma_iter_store_overwrite();
- vma_assert_write_locked() is asserting vma->vm_mm is write-locked, as
was done before this change;
- vma_assert_locked() is asserting vma->vm_mm is locked, as was done
before this change;
The following functions work for both MMU and NOMMU configs:
- vma_lock_init() performs the same initialization as for MMU config;
- mm_lock_seqcount_init(), mm_lock_seqcount_begin(),
mm_lock_seqcount_end() are called from mmap_write_{lock|unlock} and
update mm_lock_seq correctly.
- mmap_lock_speculate_try_begin(), mmap_lock_speculate_retry() work as
is because mm_lock_seq is updated correctly;
- vma_start_read(), vma_start_read_locked() will always fail because
VMAs are always detached;
- vma_end_read() will never be called because vma_start_read() never
succeeds;
- vma_is_attached() always return false because VMAs are always
detached;
- vma_assert_detached() will never trigger because VMAs are never
attached;
- vma_start_read_locked() always return false because VMAs are always
detached;
- lock_vma_under_rcu() will be safe as the attempted read lock will bail;
Changes in the following files are not affecting NOMMU config:
task_mmu.c - not compiled when CONFIG_MMU=n;
pagewalk.c - not compiled when CONFIG_MMU=n;
userfaultfd.c - not compiled when CONFIG_MMU=n (CONFIG_USERFAULTFD depends
on CONFIG_MMU);
The following changes in the BPF code are made to keep NOMMU config
working like before:
stack_map_lock_vma() - keeps mmap_lock in NOMMU config;
bpf_iter_task_vma_new() - bails out in NOMMU config;
Link: https://lore.kernel.org/20260831203056.838265-1-surenb@google.com
Link: https://lore.kernel.org/20260831203056.838265-2-surenb@google.com
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Todd Kjos <tkjos@android.com>
Cc: Christian Brauner <christian@brauner.io>
Cc: Carlos Llamas <cmllamas@google.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: David Ahern <dsahern@kernel.org>
Cc: Arve Hjønnevåg <arve@android.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Madhavan Srinivasan:
- powerpc/entry: Fix double accounting of user time on interrupt entry
- Fix leak in htmdump_init_debugfs
- KVM: PPC: Book3S HV: Set irqfd->producer only on success
- powerpc/kexec_file: print configured kernel command line
- Remove redundant early_init_dt_scan_root() call
- misc fixes and cleanup
Thanks to Aboorva Devarajan, Amit Machhiwal, Athira Rajeev, Christophe
Leroy, Christophe Leroy (CS GROUP), Kunwu Chan, leixiang, longlong yan,
Michail Tatas, Mukesh Kumar Chaurasiya (IBM), Ritesh Harjani (IBM),
Shivang Upadhyay, Sourabh Jain, Thibault Ferrante, Vaibhav Jain, and
Venkat Rao Bagalkote
* tag 'powerpc-7.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/pasemi: Add a null pointer check to the pas_setup_mce_regs
powerpc/prom: Remove redundant early_init_dt_scan_root() call
selftests/powerpc: use MAP_FAILED instead of (void *)-1 in tm-signal-context-force-tm
powerpc/kexec_file: print configured kernel command line
KVM: PPC: Book3S HV: Set irqfd->producer only on success
powerpc/pseries/htmdump: Fix leak in htmdump_init_debugfs
selftests/powerpc/tm: Fix tcheck() reading uninitialised CR value
selftests/powerpc/pmu/ebb: fix lost_exception_test hang with sched yield change
powerpc/entry: Fix double accounting of user time on interrupt entry
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Signed-off-by: Christian Brauner <brauner@kernel.org>
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Signed-off-by: Christian Brauner <brauner@kernel.org>
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kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful
by checking the pointer validity.
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20240117091706.153431-1-chentao@kylinos.cn
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Commit 554b66233623 ("of/fdt: Scan the root node properties earlier")
moved the invocation of early_init_dt_scan_root() into
early_init_dt_verify().
early_init_devtree() already calls early_init_dt_verify(), so the root
node properties are parsed before reaching the explicit call in this
function.
Keeping the call here results in scanning the root node twice. Remove
the redundant call and rely on the invocation from
early_init_dt_verify().
This change keeps the behavior the same and removes an unnecessary
duplicate call.
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Tested-by: Shivang Upadhyay <shivangu@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260418091250.134111-1-sourabhjain@linux.ibm.com
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Kexec with the -d option prints extra logs about the kexec/kdump kernel
that help debug kexec and kdump. For example, it shows what kexec
segments are loaded, their locations, and sizes.
One key piece of information still missing is the kernel command line
configured for the kexec/kdump kernel.
With this patch included, the kernel will print the kernel command line
configured for the kexec/kdump kernel as shown below:
kexec --initrd=./initrd ./kernel -lspd --command-line="test1 test2"
Loaded elf core header at 0x22e30000, bufsz=0x2000 memsz=0x80000
kexec_elf: Command line: elfcorehdr=0x22e30000 test1 test2 <--- New
kexec_elf: Loaded initrd at 0x22eb0000
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Tested-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250725124438.327593-1-sourabhjain@linux.ibm.com
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Set irqfd->producer only after kvmppc_set_passthru_irq() succeeds to
avoid leaving a dangling pointer on failure. The bypass manager does
not register a failed producer, so the pointer is never cleared.
Fixes: c57875f5f9be ("KVM: PPC: Book3S HV: Enable IRQ bypass")
Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: leixiang <leixiang@kylinos.cn>
Reviewed-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260709055755.31297-1-leixiang@kylinos.cn
|
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If any allocation fails during init all previous allocations are
leaked and the debugfs directory is left.
Fix by freeing the allocations that have already happened and also
remove the directory that has been created.
Signed-off-by: Michail Tatas <michail.tatas@gmail.com>
Reviewed-by: Athira Rajeev <atrajeev@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/anJDq-JckR6j-6EJ@michalis-linux
|
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Since the switch to generic entry, an interrupt from user mode
accounts user time twice: once in arch_interrupt_enter_prepare()
and again in arch_enter_from_user_mode(), which irqentry_enter()
invokes for the same interrupt:
arch_interrupt_enter_prepare()
account_cpu_user_entry() /* first */
irqentry_enter()
arch_enter_from_user_mode()
account_cpu_user_entry() /* second */
The second call charges the same interval again, because
account_cpu_user_entry() accumulates the time spent in user mode
since the last return to user space.
The two calls come from the GENERIC_ENTRY preparation series,
where each step was a no-op on its own. Commit 09a9d3a8499d
("powerpc: introduce arch_enter_from_user_mode") added the hook
with the user-time accounting in it, but nothing called it yet.
Commit 893082ac769b ("powerpc: Prepare for IRQ entry exit")
copied interrupt_enter_prepare() verbatim into entry-common.h as
arch_interrupt_enter_prepare(); that copy was equally unused, as
handlers still called interrupt_enter_prepare().
Commit bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature")
made both live. On the syscall side it did the full conversion:
system_call_exception() now accounts once through the hook via
syscall_enter_from_user_mode(), rather than calling
account_cpu_user_entry() directly. On the interrupt side it
switched the handler macros to arch_interrupt_enter_prepare()
followed by irqentry_enter(), which also runs the hook, but the
accounting in arch_interrupt_enter_prepare() was not removed to
match. The double accounting starts with that commit.
With CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y this roughly doubles the
reported user time of any workload that takes interrupts. The
other accounting modes compile account_cpu_user_entry() to an
empty stub, so they are not affected.
Remove the accounting from arch_interrupt_enter_prepare() and rely
on arch_enter_from_user_mode(), which already runs for both
syscalls and interrupts. The duplicate account_stolen_time() call
is removed the same way.
On a pseries LPAR a busy loop reports 6s user time in 3s elapsed
(~210% CPU) before the fix, and 3s (~105% CPU) after it:
$ python3 -c 'while True: pass' &
$ sleep 3; ps -p $! -o etime,time,pcpu
ELAPSED TIME %CPU
Before 00:03 00:00:06 210
After 00:03 00:00:03 105
A 50% load reports ~70% usr / 30% idle before the fix, and
~49% usr / 51% idle after it:
$ taskset -c 6 stress-ng --cpu 1 --cpu-load 50 &
$ mpstat -P 6 1
CPU %usr %idle
Before 6 69.74 30.26
After 6 48.51 50.50
Fixes: bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature")
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Signed-off-by: Aboorva Devarajan <aboorvad@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260904025831.3439809-1-aboorvad@linux.ibm.com
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Madhavan Srinivasan:
- Clear TIF_SYSCALL_RET before syscall error return
- Don't drop _TIF_RESTOREALL on syscall restart
- Do not restore KUAP in arch_exit_to_user_mode_prepare()
- pci-ioda: Fix the stale irq chip reference
- Use inclusive range checks in add_usable_mem() and excluded memory
- Fix irq_soft_mask corruption on replayed interrupt exit
- MAINTAINERS: powerpc: Add Ritesh and Shrikanth
- Misc fixes and cleanups
Thanks to Amit Machhiwal, Christophe Leroy (CS GROUP), Gautam Menghani,
Harsh Prateek Bora, Jiangshan Yi, Mukesh Kumar Chaurasiya (IBM), Ritesh
Harjani (IBM), Shivaprasad G Bhat, Shrikanth Hegde, Sourabh Jain,
Tasmiya Nalatwad, Thorsten Blum, and Venkat Rao Bagalkote.
* tag 'powerpc-7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
MAINTAINERS: powerpc: Add Ritesh and Shrikanth
powerpc/ps3: Fix repository.c build failure
powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit
powerpc/pseries/pci: Fix misleading VF limit error message
powerpc/kexec_file: Use inclusive range checks for excluded memory
powerpc/kexec: Simplify kdump_extra_elfcorehdr_size()
powerpc/kexec_file: Use inclusive range checks in add_usable_mem()
powerpc/rtas_pci: No hotplug on permanently removed device on pSeries
powerpc/eeh: Fix recursive locking on devices without EEH sensitive driver
powerpc: pci-ioda: Fix the stale irq chip reference
powerpc: Do not restore KUAP in arch_exit_to_user_mode_prepare()
powerpc: Don't drop _TIF_RESTOREALL on syscall restart
powerpc/entry: Clear TIF_SYSCALL_RET before syscall error return
|
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GCC fails to build ps3_defconfig with the following errors:
arch/powerpc/platforms/ps3/repository.c: In function ‘make_first_field.constprop’:
arch/powerpc/platforms/ps3/repository.c:78:9: error: ‘strnlen’ specified bound 8 exceeds source size 3 [-Werror=stringop-overread]
78 | memcpy((char *)&n, text, strnlen(text, sizeof(n)));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/platforms/ps3/repository.c: In function ‘make_first_field.constprop’:
arch/powerpc/platforms/ps3/repository.c:78:9: error: ‘strnlen’ specified bound 8 exceeds source size 4 [-Werror=stringop-overread]
78 | memcpy((char *)&n, text, strnlen(text, sizeof(n)));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The current use of strnlen(text, sizeof(n)) triggers -Wstringop-overread
when text is a short string literal that is smaller than sizeof(n), such
as "bi" or "bus". Use strlen(text) instead and clamp the copy length to
sizeof(n) before memcpy().
Drop the redundant char * cast while at it.
Fixes: f94a84a09148 ("powerpc/ps3: refactor strncpy usage")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260703165834.137242-2-thorsten.blum@linux.dev
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When __replay_soft_interrupts() replays a pending interrupt (e.g.
PACA_IRQ_DEC -> timer_interrupt), it calls the handler directly with a
synthetic pt_regs. The DEFINE_INTERRUPT_HANDLER_ASYNC wrapper around
each handler calls arch_interrupt_async_exit_prepare() on the way out,
which calls arch_interrupt_exit_prepare() -> local_irq_disable() ->
arch_local_irq_disable(), which does:
irq_soft_mask_set(IRQS_DISABLED) /* 0x1 */
This unconditionally overwrites irq_soft_mask with IRQS_DISABLED (0x1),
stripping the IRQS_PMI_DISABLED (0x2) bit. The result is that
irq_soft_mask is 0x1 instead of IRQS_ALL_DISABLED (0x3) when the
handler returns to __replay_soft_interrupts().
For a normally-taken interrupt this is harmless: the next interrupt
always enters through arch_interrupt_enter_prepare() which
unconditionally sets irq_soft_mask to IRQS_ALL_DISABLED. But during
replay, next_interrupt() is called directly between replayed handlers
without going back through arch_interrupt_enter_prepare(), so the
stripped bit is never restored. next_interrupt() then fires a WARNING:
WARNING: arch/powerpc/kernel/irq_64.c:75
WARN_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED)
The warning was observed early in boot on a POWER10 pseries guest
during kmem_cache_init_late(), where a spinlock release triggers
interrupt replay that processes a pending timer interrupt.
Debugger state confirming the bug:
Before timer_interrupt(®s):
irq_soft_mask = 0x3 (IRQS_ALL_DISABLED) correct
irq_happened = 0x41 (HARD_DIS|REPLAYING) correct
After timer_interrupt(®s) returns:
irq_soft_mask = 0x1 (IRQS_DISABLED) WRONG - PMI bit stripped
irq_happened = 0x41 unchanged
The fix is to replace local_irq_disable() with hard_irq_disable().
hard_irq_disable() is the right primitive here for two reasons:
1. On PPC64 (hw_irq.h:301) it calls irq_soft_mask_set_return(IRQS_ALL_DISABLED),
setting the soft mask to 0x3 (both IRQS_DISABLED and IRQS_PMI_DISABLED),
which preserves the PMI bit and fixes the WARNING. The additional
work it does (__hard_irq_disable(), PACA_IRQ_HARD_DIS |=) is
redundant but safe since both are already set at this point in the
exit path; the trace_hardirqs_off() inside is guarded by
if (!arch_irqs_disabled_flags(flags)) so it will not double-fire.
2. On PPC32 (hw_irq.h:467) hard_irq_disable() maps to
arch_local_irq_disable() -> __hard_irq_disable(), which clears
MSR[EE] in hardware. This is exactly correct: PPC32 has no soft-mask
PACA mechanism, so the hardware disable is the right way to satisfy
irqentry_exit()'s requirement. This also fixes a build error on PPC32
where irq_soft_mask_set() is only defined under CONFIG_PPC64:
arch/powerpc/include/asm/entry-common.h:273: error: implicit
declaration of function 'irq_soft_mask_set'
Using hard_irq_disable() requires no #ifdef and is consistent with
how the rest of the entry code (e.g. entry-common.h:463) handles the
same PPC32/PPC64 split.
Fixes: 334f3f6d7a16 ("powerpc/entry: Disable interrupts before irqentry_exit")
Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Closes: https://lore.kernel.org/all/6f9bfb0f-b14c-468e-bb9f-c157d120d0dc@linux.ibm.com/
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260904090858.128563-1-mkchauras@gmail.com
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When the number of requested VFs exceeds MAX_VFS_FOR_MAP_PE, the
message prints that limit but labels it "Configurable VFs". Report
the configurable VF limit and the PE mapping limit with separate
error messages.
Suggested-by: Christophe Leroy <chleroy@kernel.org>
Signed-off-by: Jiangshan Yi <yijiangshan@kylinos.cn>
Reviewed-by: Christophe Leroy <chleroy@kernel.org>
[Maddy: Fixed Christophe's reviewed by tag]
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260813063731.399598-1-yijiangshan@kylinos.cn
|
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arch_check_excluded_range() checks if a kexec segment overlaps an
excluded memory range.
Both ranges use inclusive end addresses, but the overlap check uses
exclusive comparisons. This skips ranges with start == ->ranges[i].end
or end == ->ranges[i].start. Use inclusive comparisons instead.
Fixes: 6e5250eaa665 ("powerpc/crash: use generic APIs to locate memory hole for kdump")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260810145827.157972-3-thorsten.blum@linux.dev
|
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Return the size directly and drop the extra_sz variable to simplify
kdump_extra_elfcorehdr_size(). The two warning paths now fall through
to the existing return 0 at the end of the function.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260730131940.597739-2-thorsten.blum@linux.dev
|
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add_usable_mem() adds usable memory ranges for the kdump kernel.
The ranges are inclusive, but the partial overlap check uses exclusive
comparisons. This skips ranges with base == loc_end or end == loc_base.
Use inclusive comparisons instead.
Fixes: 7c64e21a1c5a ("powerpc/kexec_file: Restrict memory usage of kdump kernel")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260809162403.18142-2-thorsten.blum@linux.dev
|
|
The eeh_driver disables and offlines the PE permanently when it
exceeds the freeze count beyond eeh_max_freeze within the last hour.
The PE is only offline, so the device tree entries, eeh device
references are all intact till the real unplug of the device from
the guest/host takes place.
On pSeries, with a new hotplug of any PCI device, the drmgr initiates
a system-wide PCI rescan, which finds devices offlined by the eeh_driver
and there will be attempts to bring them online. This leads to
recurring EEHs either at the config read time itself or a bit
later depending on the type of the problem.
For PowerNV, the commit d2b0f6f77ee5 ("powerpc/eeh: No hotplug on
permanently removed dev") introduced the EEH_DEV_REMOVED flag to
prevent such inadvertent rescans on hierarchical toplogies relavent in
Baremetal setups. For pSeries, such topologies don't really make sense
as the devices are either part of the same PE OR exposed as independent
devices on multiple virtual PHBs. However, the inadvertent rescans are
still a possibility with either hotplug of a new device or otherwise
with manual system-wide pci bus rescan attempts.
So the patch checks for EEH_DEV_REMOVED before allowing config space
access just like PowerNV, making the PCI core omit the PE, and thus
preventing subsequent EEH recurances. The patch is tested on PowerVM
and KVM machines with single and multi-function devices, and on the
devices behind a switch. The unplug of the affected devices post EEH
removal is also working fine as expected.
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reported-by: Tasmiya Nalatwad <tasmiya@linux.ibm.com>
Tested-by: Tasmiya Nalatwad <tasmiya@linux.ibm.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
References: d2b0f6f77ee5 ("powerpc/eeh: No hotplug on permanently removed dev")
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/178246517230.1267.12206176311111155505.stgit@linux.ibm.com
|
|
The commit 1010b4c012b0 ("powerpc/eeh: Make EEH driver device hotplug
safe") refactored the EEH code such that the pci_rescan_remove_lock is
held at the beginning of eeh_handle_normal_event() and the
eeh_reset_device() is called with that lock being held. Looks like the
commit missed to remove the existing lock/unlock inside eeh_rmv_device()
which is no longer necessary. This is causing the eehd to hang on the
lock which it actually holds when that code path is taken.
[<0>] 0xc00000011c78f870
[<0>] __switch_to+0xfc/0x1a0
[<0>] pci_lock_rescan_remove+0x30/0x44
[<0>] eeh_rmv_device+0x290/0x2e0
[<0>] eeh_pe_dev_traverse+0x80/0x130
[<0>] eeh_reset_device+0xcc/0x23c
[<0>] eeh_handle_normal_event+0x830/0xa80
[<0>] eeh_event_handler+0xf8/0x190
[<0>] kthread+0x194/0x1b0
[<0>] start_kernel_thread+0x14/0x18
The issue is seen for cases where the errors are detected on the PHB
directly AND|OR for devices where the driver error_detected() returns
PCI_ERS_RESULT_NEED_RESET, and driver being not EEH sensitive(i.e no
error handlers like slot_reset(), resume() etc defined).
Fixes: 1010b4c012b0 ("powerpc/eeh: Make EEH driver device hotplug safe")
Cc: stable <stable@kernel.org>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/178404937381.913.2759874335293830160.stgit@linux.ibm.com
|
|
The commit f0ac60e6e311 ("powerpc/powernv/pci: Switch to use
msi_create_parent_irq_domain()") removed the legacy MSI irq chip
pnv_pci_msi_irq_chip but left behind the static definition of it and
its reference in is_pnv_opal_msi().
The KVM IRQ bypass for vfio devices is broken because the
comparision in is_pnv_opal_msi() fails on the comparision with
stale unused variable showing the below errors in dmesg.
kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (X,Y)
kvmppc_set_passthru_irq (irq X, gsi Y) fails: -2
vfio-pci A:B:C.D irq bypass producer (eventfd Z) registration fails: -2
The patch removes the stale variable definition and fixes the
is_pnv_opal_msi() by comparing against the chip name prefix.
Fixes: f0ac60e6e311 ("powerpc/powernv/pci: Switch to use msi_create_parent_irq_domain()")
Cc: stable@kernel.org
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/178716225364.1437.6201568081502251835.stgit@linux.ibm.com
|
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This is another run of the Coccinelle script for converting kmalloc()
family of allocations to kmalloc_obj() via the existing rules in
scripts/coccinelle/api/kmalloc_objs.cocci
This catches both the set of kmalloc() uses added since the first
kmalloc_obj() conversions in v7.0 and adds a large group missed in the
first pass due to Coccinelle not interacting well with the cleanup.h
scoped_...() family of macros[1]. I worked around this with spatch's
"--macro-file" argument to a file with all the scoped_...() macros mapped
to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control
flow indicator I could find.
Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc,
riscv, and s390 with no new warnings.
Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1]
Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2]
Signed-off-by: Kees Cook <kees+treewide@kernel.org>
|
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BFS (not to be confused with BeFS, the BeOS filesystem) is the
filesystem UnixWare uses for its boot partition. It has extremely
limited functionality, only supporting contiguous files and no
subdirectories. Even though the bfs driver is very small and is
unlikely to cause future maintenance problems, given that the only type
of data stored on such a partition is likely to be kernels and
bootloader settings, there is very little reason anyone would want to
access it from Linux. Other old Unix filesystems (efs, freevxfs) have
been removed recently, and bfs is highly unlikely to have any users, so
remove it as well. Retain the UAPI header to be safe.
Also update the former maintainer's email address in CREDITS.
Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Link: https://patch.msgid.link/20260904082954.48738-1-enelsonmoore@gmail.com
Acked-by: Jan Kara <jack@suse.cz>
Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: Tigran Aivazian <aivazian.tigran@gmail.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
|
|
KUAP means kernel cannot touch user memory unless it explicitly is
enabled. In the kernel it should stay AMR_KUAP_BLOCKED. While returning
to userspace just before RFI, kernel should restore the user AMR value
back.
Looks like GENERIC_ENTRY might be treating arch_exit_to_user_mode_prepare()
as the last architecture step before returning to userspace.
commit bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature")
therefore called kuap_user_restore() from that hook. But on PowerPC that
is too early. After irqentry_exit() / syscall_exit_to_user_mode() we
still run platform specific exit routines.
e.g. code snippets showing both exception handling and system call
handling as the callers of function arch_exit_to_user_mode_prepare()
which does kuap_user_restore(). The below path shows that calling
kuap_user_restore() is too early when called from
arch_exit_to_user_mode_prepare().
Exception handling in exceptions-64s.S
=======================================
bl CFUNC(do_page_fault)
..DEFINE_INTERRUPT_HANDLER_ASYNC(do_page_fault)
arch_interrupt_async_enter_prepare(regs);
state = irqentry_enter(regs);
instrumentation_begin();
irq_enter_rcu();
handler(regs);
nap_adjust_return(regs);
irq_exit_rcu();
instrumentation_end();
arch_interrupt_async_exit_prepare(regs);
irqentry_exit(regs, state); <<< too early
irqentry_exit_to_user_mode()
__exit_to_user_mode_prepare(regs, EXIT_TO_USER_MODE_WORK_IRQ);
arch_exit_to_user_mode_prepare(regs, ti_work); <<< too early
b interrupt_return_srr
.. bl CFUNC(interrupt_exit_user_prepare) <<< already calls kuap_user_restore
prep_irq_for_enabled_exit() retry can run kernel code with IRQs on. So
only when that routine is fully finished is when the user KUAP should be
fully restored which interrupt_exit_user_prepare() already takes care of
before returning.
Similarly for system call handling in interrupt_64.S
======================================================
bl CFUNC(system_call_exception)
.Lsyscall_exit:
addi r4,r1,STACK_INT_FRAME_REGS
li r5,0 /* !scv */
bl CFUNC(syscall_exit_prepare)
.. kuap_assert_locked();
syscall_exit_to_user_mode(regs); <<< too early
syscall_exit_to_user_mode_prepare(regs); <<< too early
kuap_user_restore(regs); <<< already calls
syscall_exit_prepare(), which can enable IRQs, replay a pending
interrupt, and only then rfi. Those functions already restore KUAP
immediately before rfi.
Note that if we restore the user AMR too early like in the current code
as shown from the code snippets above, then we get the following warning
when CONFIG_PPC_KUAP_DEBUG is enabled:
WARNING: arch/powerpc/include/asm/book3s/64/kup.h:293 at interrupt_exit_user_prepare+0x1a0/0x1c0
Hardware name: IBM pSeries (emulated by qemu) POWER10 (architected)
TRAP: 0700
LR: c00000000000d8d4 CTR: c0000000021fe500
MSR: <SF,EE,ME,IR,DR,RI,LE> CR: 44000804 XER: 20040000
interrupt_exit_user_prepare+0x1a0/0x1c0
interrupt_return_srr_user+0x8/0x12c
Fixes: bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature")
Fixes: 02565a782c1ee ("powerpc: Introduce syscall exit arch functions")
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/52fee44fd23acf8e1c024ace668728e626a783a8.1788101609.git.ritesh.list@gmail.com
|
|
So the syscall return sequence is as follows:
A syscall return to userspace is prepared and then a short asm sequence
that actually does the RFI. Note that this asm range is restartable i.e.
EE is still on, so an interrupt (e.g. decrementer or external interrupt)
can hit while SRR/GPRs are being loaded. This is defined via:
RESTART_TABLE(.Lsyscall_rst_start, .Lsyscall_rst_end, syscall_restart)
This restart table then sends us to syscall_restart rather than resuming
in the middle of the RFI. The same stub is also used if irq_happened
already has a pending bit (soft-masked irq that has not been replayed
yet (PowerPC special case of local_irq_disable())).
Here is a bit of a flow of sequence of code to visualize:
syscall_exit_prepare
decide full-GPR restore (_TIF_RESTOREALL) for signal,
rt_sigreturn or syscall trace
save that in regs->exit_result and return it in r3
|
v
.Lsyscall_rst_start .. _end EE still on
irq_happened set or interrupt in this range?
| no | yes
v v
cmpdi r3,0 syscall_exit_restart
restore all / zero replay irq, try exit again
volatiles; RFI must return flags in r3
again for the same cmpdi
Now r3 after prepare is the flags word, not the actual syscall return. A nested
interrupt clobbers it, so the restart stub reloads RESULT into r3 and the
C handler (syscall_exit_restart()) should put the flags back (because later asm
checks whether r3 returned from C has _TIF_RESTOREALL set or not):
cmpdi r3, 0
bne .Lsyscall_restore_regs
Note that syscall_exit_restart() already ORs any new _TIF_RESTOREALL into
exit_result, but then it only returns the new sample and not the full
regs->exit_result.
That sample could be often 0 even when restore-all is still required:
- rt_sigreturn / syscall trace set the bit in prepare's local
ret and in exit_result. They never set exit_flags, which is
what restart samples.
- a signal does set exit_flags but restart clears it. A
second pass through the stub then returns 0 while
exit_result still has the bit.
The asm as mentioned earlier then treats r3==0 as the fast path and
zeros r0/r4-r12. That means the userspace that needed the full register
set could SIGSEGVs, (which could happen often in ld64.so.2 like while
doing a parallel kernel build as reported by Venkat).
So we should instead return the accumulated exit_result, like how we do
in interrupt_exit_user_restart(). Note that prior to this commit
263e5159e00a ("powerpc: Fix exit_flags field placement in pt_regs for ptrace")
we were returning regs->exit_result from syscall_exit_restart(), but
this commit changed that behaviour.
Fixes: 263e5159e00a ("powerpc: Fix exit_flags field placement in pt_regs for ptrace")
Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Closes: https://lore.kernel.org/all/75419f88-eab9-444b-bf97-28a9765819ad@linux.ibm.com/
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Tested-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/10c86c909f870d90b3094f76b692b44ebe9caeac.1787976185.git.ritesh.list@gmail.com
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Shivaprasad reported a boot failure due to userspace processes crash on
abort() from libc.so.6. It was bisected to merge request
commit '3424d8c18a7d ("Merge tag 'core-entry-2026-08-17' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")'
Upon checking the merge, when syscall_enter_from_user_mode_randomize_stack
fails, which could happen when a tracer like seccomp or ptrace intercepts
and skips the syscall, the code returns to userspace immediately without
clearing the intermediate flag which was set.
When the next syscall is made, it immediately aborts the valid syscall
since the flag is still set. Hence clear the flag on occurrence of first
failure.
Reported-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Closes: https://lore.kernel.org/all/e301014d-568f-4ed5-bc64-b8a85ca0b1e1@linux.ibm.com/
Fixes: 3424d8c18a7d ("Merge tag 'core-entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260828053811.1042300-1-sshegde@linux.ibm.com
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|
The upcoming patch will support x86 APX eGPRs sampling by using the
reclaimed XMM register space to represent eGPRs in sample_regs_* fields.
To differentiate between XMM and eGPRs in sample_regs_* fields, an
additional argument, simd_enabled, is introduced to the
perf_reg_validate() helper. If simd_enabled is set to 1, it indicates
that eGPRs are represented in sample_regs_* fields for the x86 platform;
otherwise, XMM registers are represented.
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260824082731.1013973-18-dapeng1.mi@linux.intel.com
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paravirt_steal_rq_enabled and paravirt_steal_enabled use raw static_key
APIs which are now deprecated. Use the new API instead.
No functional change.
Signed-off-by: Hongyan Xia <hongyan.xia@transsion.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://patch.msgid.link/20260819081207.12150-1-hongyan.xia@transsion.com
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|
PREEMPT_DYNAMIC is now limited to the FULL and LAZY preemption models.
Switching model only changes the behaviour of dynamic_preempt_lazy(),
which uses a static key. There are no other static calls or static keys,
and so there's no need for HAVE_PREEMPT_DYNAMIC_CALL or
HAVE_PREEMPT_DYNAMIC_KEY.
The static key used by dynamic_preempt_lazy() is entirely local to
kernel/sched/core.c, and any architecture which selects
ARCH_HAS_PREEMPT_LAZY implements the necessary support. Remove
PREEMPT_DYNAMIC's dependencies on HAVE_PREEMPT_DYNAMIC_CALL and
HAVE_PREEMPT_DYNAMIC_KEY entirely, leaving the dependency on
ARCH_HAS_PREEMPT_LAZY.
For architectures which previously selected HAVE_PREEMPT_DYNAMIC_KEY,
PREEMPT_DYNAMIC will now be selected by default, matching x86. As the
runtime impact is limited to dynamic_preempt_lazy(), this shouldn't be
as concerning as previously (e.g. where calls to {cond,might}_resched()
stubs could introduce a measurable penalty).
As all of this can work without jump labels, JUMP_LABEL is not selected
explicitly. It is obviously preferable to have JUMP_LABEL enabled, but
this is not functionally necessary.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Tested-by: Mete Durlu <meted@linux.ibm.com>
Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Tested-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://patch.msgid.link/20260803191731.3244294-6-mark.rutland@arm.com
|
|
A task that dumps open spufs context adds a bunch of extra elf notes
describing the SPU state. It is the only reason do_coredump() unshares
the file descriptor table. We could make this conditional on spufs but
eh.
Nothing can consume those notes anymore. gdb dropped Cell Broadband
Engine debugging in 9.1 and binutils removed it in 2.34. That's about 6
years ago. So no program can actually read an SPU note out of a core
file and probably never did in recent history.
Note that the IBM Cell blades that shipped the Cell processor were
removed in commit 05bf59fbeef3 ("powerpc/cell: Remove support for IBM
Cell Blades"). The PlayStation 3 is the only platform left and nothing
there produces or reads these notes.
So remove it.
Link: https://patch.msgid.link/20260826-work-spufs-coredump-v1-1-579e72a7ab66@kernel.org
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
|
|
There's no reason to include pagemap.h in any arch include file; these
should all be too low-level to include pagemap.h. Some git archaelogy
indicates that at one point, swap.h needed declarations from pagemap.h but
couldn't include pagemap.h itself. That reason seems to have disappeared
since swap.h now includes pagemap.h.
Some of these files turn into just including the asm-generic version,
so in those cases, modify Kbuild to just use the asm-generic version
directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
|
|
Pull kvm updates from Paolo Bonzini:
"ARM64:
- Add support for 'slot' based PMU events, paired with new UAPI that
compels the user to select a specific PMU implementation
- Lazy save/restore of vCPU state for pKVM, along with various fixes
and cleanups to the management of vCPU state between the untrusted
host and pKVM hypervisor
- Disable traps of EL1 registers for nested hypervisors when
FEAT_NV2p1 is present, guaranteeing that EL2-specific register bits
are stateful in the EL1 counterpart
- Leverage FEAT_NV3 to avoid unnecessary ERET/TLBI traps when the
scope of those instructions remains 'in host' (i.e. L1
kernel/userspace)
- Pile of fixes for the management of the VNCR pseudo-TLB, such as
under-invalidations and races with concurrent TLBIs on other vCPUs
- Consolidate the non-protected and pKVM view of ICH_VTR_EL2 to a
runtime-patched constant, allowing the same data to be shared with
pKVM prior to dropping host privileges
- Considerable pile of LLM-assisted fixes around the shop but mostly
in the VGIC, our in-kernel generator of bugs (and sometimes
interrupts)
LoongArch:
- Advertise already-supported capabilities
- Some bug fixes about timer and MMIO
- Some hardening about interrupt injection
- Replace kvm_err() with kvm_pr_unimpl()
- Add FPU/LSX/LASX test cases for selftests
RISC-V:
- Svadu/Zicfiss/Zicfilp FWFT support for Guest
- Use try_cmpxchg for IMSIC MRIF RMW
- More arch-specific tracepoints in KVM RISC-V
- Eager page splitting when enabling dirty logging
- Optimize hfence request handling for SMP Guests
- Improve dirty log clearing by skipping zero bits in mask
- Guard HFENCE range loops against overflow
- CPU PM notifiers in KVM RISC-V for non-retentive idle states
- Fix kernel-mode vector context save/restore for Guest
s390:
- Fixes for vfio-ap
- Fixes for the gmap rework
- Fixes for vsie
- AI triggered fixes all over
- diag9c tracing
- code move preparation for the additional arm64 support
- enable CONTEXT_ANALYSIS
x86:
- Perform spring cleaning on x86.{c,h} and asm/kvm_host.h, by adding
regs.c (the kvm_cache_regs.h => regs.h is already applied) and
msrs.{c,h}, and moving relevant code out of x86.c
- Split kvm_mmu in three parts, respectively to describe the format
of page tables, walking the guest page tables and building the page
tables. Always use the same page table walker kvm->arch.gva_walk as
the entry point to convert a guest's virtual address, where the
previous code used two different kvm_mmu structs depending on
whether the walk included nested EPT/NPT or not. Make page fault
vmexits reuse the permission checking machinery that is used for
guest page faults. This is both a cleanup and a baby step towards
supporting XS/XU memory permissions
- Document some of the "fun" gotchas with the APIC base when creating
IRQCHIPs on x86
- Remove a defunct masterclock update from kvm_xen_shared_info_init().
It could result in incorrect kvmclock due to triggering an
unnecessary switch to/from masterclock mode
- Skip Xen runstate time updates if time has effectively gone
backwards, so that the guest doesn't report 100% steal time for
a very, very long time
- Drop KVM's runtime updates of the Xen PV timing CPUID leaf, as KVM
was updating the wrong sub-leaf, and upstream KVM will soon provide
all the information needed by userspace to populate the CPUID field
itself
- Fix a bug where KVM would walk a newly created rmap without holding
the rmap lock (or mmu_lock) during aging
- Fix a bug where aging TDP MMU SPTEs could clobber FROZEN SPTEs
- Fix a variety of #DB priority bugs
- Fix a class of races related to enabling Hyper-V emulation on a
vCPU after the vCPU is visible to the rest of KVM
- Use static calls for nested virtualization ops
- Move more KVM-internal code out of x86's kvm_host.h
- Enumerate support for a variety of Zhaoxin instructions that don't
require explicit virtualization
- Fix missing EFER validation bugs, including in the KVM_SET_SREGS*
path
- Harden kvm_vcpu_map() against double-mapping and thus leaking
references
- Misc fixes and cleanups, e.g. for largely benign syzkaller splats
x86 (Intel):
- Zero a vCPU's entry in VMX's Posted Interrupt Descriptor table used
for IPI virtualization when the vCPU is freed, to fix a
use-after-free where hardware will write to a freed vCPU's PID
- Service local TLB flushes on a failed nested VM-Enter to fix a bug
where KVM could miss a TLB on a future, successful VM-Enter with
the same L2 VPID
- Cap the maximum value shoved into the VMX Preemption Timer to
workaround an erratum that affects all existing Intel CPUs that
support CPUID 0x15
- Fix VPID virtualization bugs where KVM would fail to flush hardware
TLBs
- Harden the TDX "populate" ioctls against bad input, and to prepare
for supporting in-place private<=>shared conversion
x86 (AMD):
- Forcefully invalidate SNP VMSA pages if their backing guest_memfd
page is zapped/invalidated, e.g. due to a PUNCH_HOLE in response to
a Page-State Change request
- Remove a dying VM from the GA Log notifier list before the VM is
actually destroyed, to fix a potential use-after-free
- While FOLL_WRITE was needed in the past to trigger CoW unsharing,
nowadays FOLL_LONGTERM does that already even without FOLL_WRITE,
and in fact, get_user_pages() actually disallows FOLL_WRITE
together with FOLL_LONGTERM. So don't pass FOLL_WRITE when
registering encrypted memory regions, i.e. when pinning SEV/SEV-ES
guest memory, to fix a regression with file-backed memory
introduced by KVM's (correct) usage of long-term pins
(This was reviewed by mm maintainers; for more information, see
commit ee1a586dd1fa "KVM: SEV: Drop FOLL_WRITE for encrypted region
registration")
- Allocate full pages for SEV/SEV-ES {DE,EN}CRYPT ops on SNP-enabled
hosts to fix a data corruption issue due to the PSP driver
assigning to-be-written pages to firmware (as required by the SNP
specs)
- Unconditionally intercept ICBEP so that KVM generates the correct
guest RIP when handling an ICEBP-induced TASK_SWITCH #VMEXIT
- Harden the SNP "populate" ioctls against bad input, and to prepare
for supporting in-place private<=>shared conversion
Generic:
- Remove kvm_debugfs_dir if kvm_init() fails after creating KVM's
debugfs
- Add a per-VM bitmap to track which vCPU IDs have been "claimed" but
for which the vCPU isn't yet online, and use the bitmap to reject
duplicate IDs before calling into arch code. This allows arch code
to consume vcpu_id without having to worry about cross-vCPU
clobbering (at least s390 and x86 have had related bugs)
- Rework the so called "prepare" and "invalidate" guest_memfd hooks
to prepare for in-place private<=>shared conversion, and clean up a
few warts along the way
Selftests:
- Automatically allocate a full page for L2 guest stacks on x86
instead of requiring test-specific L1 guest code to carve out a
portion of the L1 stack for L2 usage, and to ensure the L2 stack
also adheres to the x86-64 calling convention ABI
- Add a selftest to verify {Guest,Host}-Only behavior in x86's
mediated PMU
- Clean up nested SVM's handling of GPRs on L2<=>L1 transitions,
reuse the functionality for nested VMX, and drop the ucall hack
that was fudging around the lack of GPR switching on nVMX
- Add a stress test to verify KVM doesn't clobber/drop #PF state,
e.g. CR2, across save/restore, including when L2 is active
- Add a test to verify KVM_CREATE_VM accepts exactly what is reported
by KVM_CAP_VM_TYPES
- Misc selftests fixes and cleanups
- Fix several issues with seeding the pRNG, and rework the pRNG APIs
to that the pRNG can be sanely used in host code, not just guest
code
- Add an IRQ test to validate virtual IRQ deliverty for IRQs wired up
via KVM_IRQFD + KVM_SET_GSI_ROUTING, with optional support for
triggering IRQs via writes to an assigned VFIO device
- Add syscall wrappers to assert success on a variety of pthreads and
CPU affinity APIs
- Set vCPU pthread affinity as early as possible to reduce contention
issues that were surfaced by PREEMPT_LAZY, which result in runtimes
of over a minute on large hosts, versus the expected ~5 seconds
- Rework the PMU counters test to run each testcase using a single VM
with many vCPUs for each sub-testcase, instead of using a unique VM
for each sub-testcase. This cuts the runtime by ~20x
Miscellaneous:
- MAINTAINERS updates for vfio-ap, guest_memfd, kvm-x86. Mostly
representing the status quo more accurately, but also... welcome
David Hildenbrand as guest_memfd reviewer!"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (413 commits)
KVM: arm64: Validate GICv5 timer PPIs before claiming ownership
KVM: arm64: vgic: Reject out-of-range GICv5 PPI IDs
KVM: arm64: vgic: Prevent speculative SPI array underflow
KVM: arm64: vgic: Free gic_kvm_info on initialization failure
KVM: arm64: Avoid mismatched accesses to 'struct kvm_nvhe_init_params'
s390/vfio-ap: Fix NULL deref in status_show() during queue probe
s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed
s390/vfio-ap: fix potential use of uninitialized apm_filtered bitmap
s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove
s390/vfio-ap: Fix required lock not held during update of ap_matrix_mdev object
s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects
s390/vfio-ap: Fix dereference matrix_mdev->kvm without checking for NULL
s390/vfio-ap: Fix stale do_remove flag across iterations in vfio_ap_mdev_cfg_remove
RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector
riscv: vector: allow non-preemptible kernel-mode vector with IRQs off
riscv: vector: refactor riscv_v_start_kernel_context
KVM: s390: gmap: Make prefix handling optional
KVM: s390: gmap: Make CMMA optional
KVM: s390: gmap: Make storage keys optional
KVM: s390: Prepare gmap for a second KVM implementation
...
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull TTY / serial driver updates from Greg KH:
"Here is the "big" set of tty and serial driver updates for 7.3-rc1.
Not really all that much happened this development cycle for this
subsystem, changes in here are:
- removal of the ipwireless driver as it's no longer used or needed
- new 8250_mxpcie driver added
- qcom serial driver updates and additions
- vt mode validation addition
- lots of other small serial driver updates and additions
All of these have been in linux-next for weeks with no reported issues"
* tag 'tty-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (97 commits)
serial: imx: serialize imx_uart_ports[] lifetime
tty: clear cdev pointer after cdev_add() failure
tty: skip cdev_del() when no cdev is registered
serial: core: clear freed pointers on uart_register_driver() failure
serial: core: do fallible allocations before the console can be registered
serial: 8250_mxpcie: implement rx_trig_bytes callbacks via MUEx50 RTL
serial: 8250_mxpcie: introduce per-port private data structure
serial: 8250: allow UART drivers to override rx_trig_bytes handling
serial: 8250_mxpcie: add break support for RS485 using MUEx50 features
serial: 8250: allow low-level drivers to override break control
serial: 8250_mxpcie: support serial interface mode switching
serial: 8250_mxpcie: speed up TX using memory-mapped FIFO window
serial: 8250_mxpcie: speed up RX using memory-mapped FIFO window
serial: 8250_mxpcie: add custom handle_irq callback
serial: 8250_mxpcie: offload XON/XOFF flow control to MUEx50 hardware
serial: 8250_mxpcie: enable automatic RTS/CTS flow control
serial: 8250_mxpcie: enable enhanced mode and program FIFO trigger levels
serial: 8250: add Moxa MUEx50 UART port type
serial: 8250: split Moxa PCIe serial board support out of 8250_pci
serial: qcom-geni: Use geni_se_set_perf_level() for baud rate perf level
...
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|
of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux
Pull dma-mapping updates from Marek Szyprowski:
- swiotlb:
- new configuration option for the default pool size
(Jagadeesh Pagadala)
- reduce overhead for high watermark tracking (chenhuguanshen)
- minor code cleanups and improvements (Vova Sharaienko, Honglei Huang
and Marek Szyprowski)
- add proper tracking of the shared DMA state through direct, pool and
swiotlb paths (Aneesh Kumar K.V)
This is important for confidential-computing
* tag 'dma-mapping-7.3-2026-08-24' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux:
dma/swiotlb: decouple high watermark tracking from CONFIG_DEBUG_FS
MAINTAINERS: update tree for DMA MAPPING HELPERS
dma/swiotlb: introduce Kconfig option for compile-time default pool size
dma-direct: Improve readability of the dma_direct_map_sg() for P2PDMA case
iommu/dma: simplify dma_iova_destroy() and drop the free_iova helper
dma-coherent: use KiB in DMA allocation logs
dma-coherent: fix spacing coding style issue
* tag 'dma-mapping-7.3-2026-08-24-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux: (23 commits)
swiotlb: remove unused SWIOTLB_FORCE flag
dma: swiotlb: handle set_memory_decrypted() failures
dma: swiotlb: free dynamic pools from process context
dma-direct: rename ret to cpu_addr in alloc helpers
dma-direct: select DMA address encoding from __DMA_ATTR_ALLOC_CC_SHARED
dma-direct: set decrypted flag for remapped DMA allocations
dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED
dma-direct: Move dma_direct_map_phys() to dma/direct.c
dma-direct: pass attrs to dma_capable() for DMA_ATTR_CC_SHARED checks
dma-mapping: make dma_pgprot() honor __DMA_ATTR_ALLOC_CC_SHARED
dma: swiotlb: track pool encryption state and honor DMA_ATTR_CC_SHARED
dma: swiotlb: pass mapping attributes by reference
dma-pool: track decrypted atomic pools and select them via attrs
dma-direct: use __DMA_ATTR_ALLOC_CC_SHARED in alloc/free paths
dma-mapping: Add internal shared allocation attribute
coco: arm64: s390: powerpc: Mark secure guests with CC_ATTR_GUEST_MEM_ENCRYPT
dma-direct: swiotlb: handle swiotlb alloc/free outside __dma_direct_alloc_pages
s390: Expose protected virtualization through cc_platform_has()
swiotlb: Preserve allocation virtual address for dynamic pools
dma: free atomic pool pages by physical address
...
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git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
Pull PCI updates from Bjorn Helgaas:
"Resource management:
- Add hotplug reservation only once (not at each level of the
hierarchy) so bridge windows don't grow more than necessary (Ilpo
Järvinen)
Driver binding:
- Rework device matching so device ID lifetime only needs to cover
the probe path since dynamic IDs can be removed at any time (Gary
Guo)
Error handling:
- Update mappings of AER errors to agent & layer and log them for
each individual error when multiple errors detected (Lukas Wunner)
- Log Error Source only once, not twice in separate messages (Lukas
Wunner)
- Emit TLP Log only for unmasked errors (Lukas Wunner)
- Support Advisory Non-Fatal Errors (Lukas Wunner)
- Allow DPC on all Downstream Ports, not just Root Ports, when OS
controls AER (Darshit Shah)
ASPM:
- Program the same ASPM Control values for every function of
multi-function devices, as recommended by the PCIe spec (Krishna
Chaitanya Chundru)
- Avoid L0s for Realtek RTS525A, where it causes an AER interrupt
storm (Max Lee)
- Avoid ASPM L0s, L1, and L1 PM Substates based on 'aspm-no-l0s',
'aspm-no-l1' [1], and 'aspm-no-l1ss' DT properties (Krishna
Chaitanya Chundru)
Power management:
- Allow D3 for native hotplug-capable Root Ports on non-x86 platforms
(we avoid D3 for these ports on x86 because some old platforms
didn't validate it) (Manivannan Sadhasivam)
- Allow portdrv to claim Ports even if they don't support services
(AER, PME, DPC, hotplug, etc) so it can do power management (Brian
Norris)
Power control:
- Add support for PCIe WAKE# interrupt when described via DT (Krishna
Chaitanya Chundru)
- For the TC9563 PCIe switch:
- Take a reference on the I2C adapter to avoid uninterruptible
hang when unloading an I2C module while in-use (Johan Hovold)
- Update DT binding and driver to restrict Tx Amplitude, DFE and
N_FTS to USP, DSP1 and DSP2 (Manivannan Sadhasivam)
- Power off only external-facing ports (DSP1, DSP2), leaving USP
and DSP3 (aka VDSP) powered up (Manivannan Sadhasivam)
- Move integrated MAC Endpoint out of the list of internal ports
and configure it separately (Manivannan Sadhasivam)
Virtualization:
- Add ACS quirk for Pericom PI7C9X2G608 switches (Tim Harvey)
- Fix a long-standing bug in the Intel PCH Root Port MPC ACS quirk
that didn't update the intended INTEL_MPC_REG_IRBNCE bit because it
used a 16-bit config write when a 32-bit write was intended
(Mohamad Raizudeen)
Procfs:
- Avoid spurious runtime PM wakeup on config space accesses that are
outside config space and fail before reaching PCI (Krzysztof
Wilczyński)
- Warn on user-space writes to kernel-exclusive config space regions,
as we already do for sysfs (Krzysztof Wilczyński)
- Check credentials of opener, not reader, for config space reads, as
we already do for sysfs (Krzysztof Wilczyński)
Sysfs:
- In pci_write_legacy_io(), avoid out-of-bounds reads from the user
buffer and fix incorrect ioport write data (1-byte writes on
little-endian powerpc, 2- and 4-byte writes on big-endian powerpc)
(Krzysztof Wilczyński)
- In pci_read_legacy_io(), fix incorrect ioport read data for 2- and
4-byte reads on big-endian powerpc (Krzysztof Wilczyński)
- Fix I/O port accessor argument order in Alpha pci_legacy_write()
(Krzysztof Wilczyński)
- Avoid spurious runtime PM wakeup on config space accesses that are
outside config space and fail before reaching PCI (Krzysztof
Wilczyński)
- Return -EINVAL, not -ENODEV, for mmap of I/O BAR that fails because
the arch doesn't support it, as we do for procfs (Krzysztof
Wilczyński)
- Check for LOCKDOWN_PCI_ACCESS for legacy_io and legacy_mem, as we
do for other config space accessors (Krzysztof Wilczyński)
Peer-to-peer DMA:
- Add Nvidia Vera Rubin to list of platforms that support P2PDMA
(Leon Romanovsky)
Endpoint framework:
- Check doorbell SUCCESS bit in pci_endpoint_test to avoid treating
some failures as successes (Niklas Cassel)
- Fail doorbell test when the trigger IRQ is missed (Niklas Cassel)
New native PCIe controller drivers:
- Add DT binding and driver for NVIDIA Tegra264 (Thierry Reding)
Native PCIe controllers:
- Use common wait time definitions for PCIe link monitoring instead
of defining driver-private duplicates (Thierry Reding)
Generic host bridge driver:
- Fix NULL pointer dereference that caused enumeration failures on
32-bit CAM systems (Steffen Persvold)
Amlogic Meson PCIe controller driver:
- Correct the PERST# GPIO state so it remains asserted until power
and REFCLK become stable to fix enumeration failure (Ronald
Claveau)
ASPEED PCIe controller driver:
- Switch to irq_domain_create_linear() so we can obsolete
irq_domain_add_linear() (Jiri Slaby)
Cadence PCIe controller driver:
- Add MODULE_DEVICE_TABLE to generate module aliases for OF-based
module autoloading (Pengpeng Hou)
- Add debugfs 'ltssm_status' file for LGA- and HPA-based Cadence
controllers (Hans Zhang)
- Support up to x4 (not x2) lanes for J200 (Takuma Fujiwara)
- Fix host/endpoint dependencies for cadence-plat driver to fix link
error when cadence-plat is built-in but the host or endpoint driver
is modular (Aksh Garg)
Freescale i.MX6 PCIe controller driver:
- Add imx6 intr/aer/pme interrupt lines for i.MX95 (Richard Zhu)
- Remove PERST# checking from pci_host_common_parse_port() so callers
can decide whether to fall back to legacy DT binding with PERST# in
the host bridge (Sherry Sun)
- Fix build issues when PCI_PWRCTRL_GENERIC or PCI_HOST_COMMON is a
module (Arnd Bergmann)
- Create pwrctrl devices only once by doing it from imx_pcie_probe()
instead of imx_pcie_host_init(), which is used during both probe
and resume (Sherry Sun)
- Use 'dw_pcie_rp->skip_pwrctrl_off' to avoid powering off devices
during suspend to preserve wakeup capability (Sherry Sun)
- Add runtime PM support for i.MX95 to allow dynamic power management
when the link is idle (Richard Zhu)
Intel VMD host bridge driver:
- Support device ID 0x28C1 and assume that BIOS has already
enumerated the hierarchy below VMD and stored bus range info for OS
to use (Nirmal Patel)
- Add support for VMCONFIG BUS_RESTRICT_CFG=3, which makes it
possible to enumerate downstream devices on Intel Arrow Lake-HX
systems and probably others (Ali Alaei)
- Pay attention to _OSC negotiation for VMD hierarchy only when
running on bare metal, not when running in a VM (Nirmal Patel)
- Add Nova Lake (NVL) and Dunlow (DNL) Device IDs (Szymon Durawa)
MediaTek PCIe controller driver:
- Add support for PCIe controller in EcoNet EN7528 and EN751221 SoCs
(Caleb James DeLisle)
MediaTek PCIe Gen3 controller driver:
- Add mediatek-gen3 'memory-region' for restricted DMA buffer
(Chen-Yu Tsai)
NVIDIA Tegra264 PCIe controller driver:
- Distinguish Tegra264 C0 PCIe controller for internal GPU from C1-C5
controllers so the unit address matches the first 'reg' entry
(Thierry Reding)
- Add Tegra264 Root Port stanzas to prepare for generic WAKE#
handling (Thierry Reding)
Qualcomm PCIe controller driver:
- Add IPQ9650 compatible with global interrupt (Kathiravan
Thirumoorthy)
- Add IPQ5210 compatible with IPQ9574 fallback (Varadarajan
Narayanan)
- Add DT binding and driver support for Hawi SoC (Matthew Leung)
- Skip PERST# GPIOs provided by downstream PCIe devices, which should
be handled by drivers of those devices (Manivannan Sadhasivam)
- Stop advertising Attention Button Present (no Qcom SoCs support
Attention Buttons) so pciehp can use Presence Detect Changed events
(Qiang Yu)
Renesas R-Car PCIe controller driver:
- Add rcar-gen4-pci-host optional 'msi-parent' for GIT ITS (Marek
Vasut)
- When MSI is enabled but iMSI-RX is not used, configure AXIINTC to
allow GIT ITS to handle MSI (Marek Vasut)
- Refactor GIC600 implementation to make it easier to add platforms
that only support 32-bit addressing (Marek Vasut)
- Add Renesas R-Car Gen4 S4/V4H/V4M to the list of GIC600
integrations that only support 32-bit addressing (Marek Vasut)
Renesas RZ/G3S PCIe controller driver:
- Add DT binding and driver support for RZ/V2H(P) SoC, which contains
two PCIe controllers, configured either as a single x4 link or two
independent x2 link controllers (Lad Prabhakar)
SpacemiT K1 PCIe controller driver:
- Add missing MODULE_DEVICE_TABLE() to generate module alias info for
OF-based module autoloading (Pengpeng Hou)
StarFive PCIe controller driver:
- Fix resource leaks on error paths in host_init() (Ali Tariq)
- Fix runtime PM handling and teardown ordering to avoid register
access while power or clocks are disabled (Ali Tariq)
- Check for runtime PM resume failure to avoid register access while
power or clocks are disabled (Ali Tariq)
Synopsys DesignWare PCIe controller driver:
- Add LECARC PMU IDs to the DWC RAS/DES VSEC list so it can take
advantage of the existing debugfs support for silicon debug, error
injection, and event counters (Brett Zhou)
- Factor pcie_valid_speed() and pci_bus_speed2lnkctl2() out of bwctrl
so they can be shared by the DWC core (Hans Zhang)
- Flush MSI writes from endpoint before unmapping the iATU, as we
already do for MSI-X writes (Niklas Cassel)
- Unmap MSI iATU window before mapping MSI-X window, to avoid a
subsequent MSI write using a disabled aperture and losing the
interrupt (Niklas Cassel)
- Change endpoint .pre_init() and .init() callbacks to return errors
and handle them (Marek Vasut)
UltraRISC PCIe controller driver:
- Add 'core', 'dbi', and 'aux' clocks to DT binding and manage them
in the driver (Jia Wang)
- Use module_platform_driver() since this may be built as a module,
though not removable because IRQs can't be safely disposed (Jia
Wang)
MicroSemi Switchtec management driver:
- Add Microchip PCI1008 device ID and include it in NTB DMA alias
quirk (Logan Gunthorpe)
Miscellaneous:
- Document how to write PCI Host Controller drivers (Manivannan
Sadhasivam)
- Fix typos in documentation (D'Orus Tsitera)
- Use %pe format specifier to print error pointers so we get symbolic
errname when available (Krzysztof Wilczyński)"
* tag 'pci-v7.3-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci: (124 commits)
PCI: vmd: Add Nova Lake (NVL) and Dunlow (DNL) Device IDs
PCI: tegra264: Add Tegra264 support
dt-bindings: PCI: tegra264: Switch to PCIe Root Port bindings
dt-bindings: PCI: tegra264: Strictly distinguish C0 from C1-C5
PCI/AER: Support Advisory Non-Fatal Errors
PCI: Fix 32-bit config write in Intel PCH Root Port MPC ACS quirk
PCI: dwc: Handle return value from endpoint .pre_init callback
PCI: dwc: Handle return value from endpoint .init callback
PCI: dwc: Add PCI ID for LECARC PCIe PMU
PCI/ASPM: Mask ASPM states based on Devicetree properties
PCI/ASPM: Disable/restore ASPM on every function for multi-function devices
Documentation: PCI: Document how to write PCI Host Controller drivers
PCI/ASPM: Use pcie_capability_clear_and_set_word() for ASPM disable/restore
PCI: Add support for PCIe WAKE# interrupt
PCI: Allow D3 for native hotplug-capable Root Ports on non-x86 platforms
dt-bindings: PCI: Correct white-space style
PCI/ASPM: Avoid L0s for Realtek RTS525A
PCI: ultrarisc: Use module_platform_driver()
PCI: ultrarisc: Get and enable DP1000 PCIe controller clocks
dt-bindings: PCI: ultrarisc: Add required DP1000 PCIe clocks
...
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- "mm: drop "sub" prefix from various places" (Dev Jain)
page->folio conversion and a naming cleanup
- "mm/kasan: remove redundant initialization for kasan_flag_write_only"
(Igor Putko)
KASAN cleanup work
- "mm/filemap: reduce unnecessary xarray lookups" (Chi Zhiling)
Small speedup in the pagecaache read code
- "mm/percpu: Fix possible NOFS/NOIO reclaim recursion" (Kaitao Cheng)
Improve the vmalloc code - mainly the avoidance of GFP_KERNEL
allocations when the caller asked for GFP_NOFS or GFP_NOIO
- "mm/kmemleak: avoid soft lockup when scanning task stacks" (Breno
Leitao)
Avoid a soft lockup watchdog trigger from the kmemleak scanning code
in extreme situations
- "mm/page_owner: misc cleanups" (Ye Liu)
Cleanups to the page_owner code. For some reason lots of people have
been working on the page_owner code this cycle.
- "mm: convert to walk_page_range_vma() to eliminate find_vma()"
(Kefeng Wang)
Simplify and accelerate the page walking library function
- "mm/migrate: preparatory cleanups for batch copy and offload"
(Shivank Garg)
Cleanups in the migration code
- "mm/page_owner: add per-fd filter infrastructure for print_mode and
NUMA filtering" (Zhen Ni)
Per-fd filtering to page_owner in order to reduce the sometimes vast
amount of output it can produce
- "mm: Refactor bootmem gigantic hugepage allocation" (Muchun Song)
Fixes and preparatory cleanups around bootmem HugeTLB handling,
sparse initialization ordering, and related vmemmap setup
- "mm/zsmalloc: reduce lock contention in zs_free()" (Wenchao Hao)
Reduce lock contention in zs_free(), which dominates the unmap path
under memory pressure on Android (LMK kills) and on x86 servers
running zswap-heavy workloads.
Up to 1.83x improvement in microbenchmarking.
- "move alloc_tag.c file under mm/" (Suren Baghdasaryan)
- "samples/damon: handle damon_{start,stop}() failures" (SJ Park)
Fix improper handling of damon_start(), damon_stop(), and
damon_call() failures across DAMON sample modules to prevent
potential memory leaks, operation disruptions and use-after-free
bugs
- "mm/damon/sysfs: kobject_del() directories that users can
create/remove" (SJ Park)
Fix delayed sysfs directory removal under DEBUG_KOBJECT_RELEASE
causeing creation failures due to duplicate directory names by adding
missing kobject_del() calls before creating new directories
- "mm: cleanup clear_not_present_full_ptes()" (David Hildenbrand)
Clean up the core pte handling code
- "selftests/damon: misc fixes for test bugs" (Kunwu Chan)
Fix several bugs in the DAMON selftests
- "selftests/damon: fix memcg_path staging handling" (Cheng Nie)
Fix a bug in _damon_sysfs.py for damos_filter memcg_path setup, and
add a test case for it in sysfs.py.
- "selftests/damon: test kdamond refresh_ms" (Ruslan Valiyev)
Selftest coverage for DAMON's refresh_ms sysfs feature by updating
the test control module and verifying that scheme stats update
automatically without manual intervention
- "mm/damon: five misc fixups" (Akinobu Mita)
Miscellaneous DAMON fixups.
- "mm/damon/core: detect internal variation above max_nr_regions/2"
(Jiayuan Chen)
Fix DAMON's region splitting behavior when region counts exceed half
the maximum budget by dynamically scaling down the split fraction as
the limit approaches, preventing large regions from staying un-split,
and add corresponding KUnit test coverage
- "mm: preparatory patches for PMD level swap entries" (Usama Arif)
Refactor and clean up PMD softleaf helpers, call sites, and
architecture flags to lay the groundwork for a follow-up series that
introduces PMD page table swap entries
- "mm/damon: update, optimize, and clean up doc, tests, and code" (SJ
Park)
Update DAMON design and ABI documentation, expands unit and selftest
coverage, optimize damon_commit_target_regions(), and clean up
recently added sysfs interface code for better readability
- "mm/vmpressure: reduce CPU, memory and code overhead on cgroup v2"
(Usama Arif)
Optimize vmpressure() by skipping unnecessary work on cgroup v2 for
userspace event notifications and refactor v1-only eventfd handling
into mm/memcontrol-v1.c to reduce memory overhead and code complexity
- "selftests/mm: refactor pkey helpers and fix mmap error handling"
(Hongfu Li)
Refactor pkeys shared tracing and assertion helpers into a common
file, unify protection key selftests to use consistent diagnostic
logging and assertions, and enforce standardized MAP_FAILED return
checks for mmap() calls across the tests
- "mm/damon: optimize out nr_accesses_bp" (SJ Park)
Replace the error-prone, continuously updated nr_accesses_bp field in
damon_region with an on-demand moving sum function, reducing
structure memory overhead and avoiding state corruption bugs
- "Open HugeTLB allocation routine for more generic use" (Ackerley Tng)
Decouple HugeTLB folio allocation from VMA dependencies by
introducing hugetlb_alloc_folio(), enabling subsystems like
guest_memfd to allocate HugeTLB folios without standard VMA
reservations or pseudo-VMAs
- "mm/damon: provide pseudo moving sum probe_hits" (SJ Park)
Integrate DAMON's probe_hits attribute counter into the pseudo moving
sum infrastructure, enabling real-time, online monitoring without
waiting for full aggregation intervals
- "mm: Some cleanups for page allocator APIs" (Brendan Jackman)
Simplify and refactor the page allocator entry points and flags by
unifying allocation paths, adding internal alloc_flags arguments, and
eliminating redundant __ prefixed alloc_pages variants.
- "Fix incorrect access of hugetlb pte entries" (Dev Jain)
Enforce the consistent use of huge_ptep_get() instead of ptep_get()
for HugeTLB entries and fixes an unaligned address issue in arm64's
huge_ptep_get() implementation
- "mm/damon: validate all parameters in the core" (SJ Park)
Consolidate parameter validation into the DAMON core specifically
within damon_start() and damon_commit_ctx() to centralize error
checking, eliminate caller-side redundant checks and to improve
maintenance efficiency
- "tools/mm/page_owner_sort: fix filtering and cleanup issues" (Yichong
Chen)
Rename is_need() to filter_record() for clearer return semantics, fix
per-record allocation memory leaks and bound output copies in
search_pattern() to address an existing buffer issue
- "memcg: bail out reclaim when memcg is dying" (Jiayuan Chen)
Mitigate a system-wide stall which occurs when a cgroup is removed
while one of its memory control files is doing synchronous reclaim
- "mm/memory-failure: add panic option for unrecoverable pages" (Breno
Leitao)
Introduce an opt-in vm.panic_on_unrecoverable_memory_failure sysctl
that immediately panics the kernel on unrecoverable memory errors in
kernel-owned pages to preserve error context and prevent delayed,
silent data corruption
- "mm/damon: refactor damon_{start,stop,commit}() for simple error
handling" (SJ Park)
Refactor the DAMON core API functions to guarantee that all contexts
are fully stopped when damon_start(), damon_stop(), or damon_commit()
fail, eliminating the need for complex and error-prone caller-side
cleanup code
- "Keep tail page private zero at free and folio split" (Zi Yan)
Add checks to ensure tail_page->private is zero when freeing compound
or high-order pages and when promoting tail pages during large folio
splits. By validating these fields at free and split time, it allows
the removal of redundant private field clearing inside
prep_compound_tail()
- "mm: drop redundant lru_add_drain in anon folio reuse paths" (Barry
Song)
Eliminate redundant lru_add_drain() calls in
wp_can_reuse_anon_folio() and do_swap_page() to reduce LRU lock
contention and system overhead
By validating folio refcounts against the LRU cache before draining
and removing unnecessary drains in the swap path, it achieves up to a
30.5% reduction in drain calls during heavy swap workloads
- "mm: clean up folio LRU and swap declarations" (Jianyue Wu)
Reorganize folio LRU and swap code by relocating page-cluster state
to mm/swap_state.c, renaming mm/swap.c to mm/folio.c, and moving
MM-internal reclaim declarations into mm/internal.h.
- "userfaultfd: working set tracking for VM guest memory" (Kiryl
Shutsemau)
Add userfaultfd support for tracking the working set of VM guest
memory, so a VMM can identify hot pages and reclaim cold ones to
tiered or remote storage
- "mm: remove CONFIG_HAVE_BOOTMEM_INFO_NODE (Part 2)" (David
Hildenbrand)
Remove the remaining pieces of CONFIG_HAVE_BOOTMEM_INFO_NODE,
performing some smaller cleanups around freeing of reserved vmemmap
pages on the way.
- "mm/damon: update probe hits for runtime parameter commits" (SJ Park)
Ensure that DAMON's probe_hits attribute counter is properly updated
when monitoring intervals are changed at runtime, matching the
behavior of nr_accesses. To achieve this, it refactors and renames
existing helper functions for shared use, applies the updates to
probe_hits, and handles edge cases in damon_probe_hits_mvsum() to
maintain measurement accuracy.
- "KSM: performance optimizations for rmap_walk_ksm" (xu xin)
Resolve a severe KSM reverse-mapping performance bottleneck where
thousands of split VMAs sharing a single anon_vma cause extended lock
contention.
By adding an interval-filtering check during the rmap walk, it
reduces worst-case anon_vma lock hold times from over 500ms down to
under 2ms, preventing application freezes and latency spikes under
memory pressure.
- "mm: split a couple of headers from internal.h" (Mike Rapoport)
Split declarations related to mm_init, memblock, vmalloc and sparse
into new headers
- "KSM: use linear_page_index in collect_procs_ksm()" (xu xin)
Apply the interval tree optimization from rmap_walk_ksm() to
collect_procs_ksm() to avoid iterating over non-matching VMAs during
KSM memory error handling.
It hoists loop-invariant address initialization and restricts the
anon_vma_interval_tree_foreach walk to a targeted page offset range,
reducing redundant checks and improving lookup efficiency.
- "selftests/mm: avoid false failures in hugetlb and KSM tests" (Sayali
Patil)
Fix issues in the hugetlb and KSM MM selftest categories that can
report failures when the prerequisites for the tests are not
satisfied
- "mm/damon: introduce data attributes only monitoring" (SJ Park)
Introduce attribute-weighted region management in DAMON, allowing
users to prioritize specific data attributes (such as page sizes or
cgroups) over or instead of access monitoring.
By assigning weights to attribute probes, DAMON can completely
disable access tracking and adjust monitoring regions based on
weighted probe-hit counters to optimize monitoring quality for
attribute-focused workloads.
- "mm/hmm: Add mmap lock-drop support for userfaultfd-backed mappings"
(Stanislav Kinsburskii)
Extend hmm_range_fault() to support userfaultfd-backed regions by
allowing the mmap lock to be dropped during fault handling via a new
hmm_range_fault_locked() helper.
By accepting a locked pointer and signaling retry status when lock
release occurs, it enables page fault resolution in userfaultfd
regions while preserving backward compatibility for existing callers.
- "mm: make VMA page offset handling more consistent" (Lorenzo Stoakes)
Clean up and standardize how vma->vm_pgoff is accessed and
manipulated across file-backed and anonymous mappings in the kernel
It introduces dedicated helper functions such as vma_start_pgoff(),
vma_end_pgoff(), vma_set_pgoff() and linear_page_delta() while
renaming rmap interval tree helpers to better reflect their
functionality.
These changes establish a cleaner foundation for future work that
will unify virtual page offset indexing for all anonymous and CoW'd
folios.
- "mm: handle device-private PMDs in walk callbacks" (Usama Arif)
Address kernel panics and state corruption caused by MM walk
callbacks reaching non-present device-private PMD swap entries
created during HMM migrations
It ensures that functions which acquire pmd_trans_huge_lock()
properly recognize device-private PMDs instead of assuming a present
THP or a standard migration entry.
- "mm/rmap: Refactor try_to_unmap_one" (Dev Jain)
Refactor try_to_unmap_one by modularizing Hugetlb,
anonymous-lazyfree, and anonymous-swapbacked logic into dedicated
functions, laying the structural groundwork for batched anonymous
large folio unmapping.
- "Docs/ABI/damon: sysfs ABI document fixes and additions" (Song Hu)
Fix typos and fills in missing entries in the DAMON sysfs ABI
document
- "dax/kmem: atomic whole-device hotplug via sysfs" (Gregory Price)
Introduce an atomic sysfs state attribute and supporting DAX/MM
infrastructure to prevent userland races when offlining and removing
entire memory regions
By adding an unplugged state alongside standard online modes, it
enables whole-device atomic hotplug control while preserving backward
compatibility.
- "mm: convert more vm_flags_t users to vma_flags_t" (Lorenzo Stoakes)
Continue transitioning the kernel from the deprecated vm_flags_t type
to vma_flags_t across core memory management infrastructure.
It replaces legacy type usage in core functions such as do_mmap(),
unmapped area allocation, mm->def_vma_flags, and VMA operations like
mlock, mprotect, and mremap.
- "Two small patches to clean up mm/mm_slot.h" (xu xin)
Refactor mm_slot.h by introducing mm_slot_remove() to unify duplicate
slot deletion sequences in khugepaged and KSM. It also adds code
documentation explaining why mm_slot_lookup and mm_slot_insert must
remain as preprocessor macros rather than static inline functions.
- "mm/damon/core: hide core-private struct fields" (SJ Park)
Clean up DAMON core structures by consistently marking internal-only
fields with private: comment tags to prevent improper direct access
from outer layers.
It enforces encapsulation across core structures including
damon_region, damon_target, and damon_ctx and updates DAMON_SYSFS to
interact through approved access APIs instead of exposing raw struct
members.
- "mm/damon: unurgent fixes for infinite loop, NULL de-ref and races"
(SJ Park)
Address potential infinite loops, NULL dereferences, and race
conditions identified in DAMON
It fixes an infinite loop triggered by extreme user configurations, a
NULL pointer dereference within unit tests and minor monitoring
accuracy degradation caused by subtle runtime races.
- "mm/page_alloc: fixes for free_pages_nolock() on RT/UP" (Brendan
Jackman)
Fix an NMI safety flaw in __free_frozen_pages() where freeing pages
on non-SMP or PREEMPT_RT kernels can bypass can_spin_trylock() checks
via non-PCP or isolated migration paths.
It also resolves potential kernel crashes and privilege escalation
risks triggered when BPF tracing runs in NMI context alongside memory
hotplug or large allocation frees.
- "mm/page_alloc: couple of followups for recent cleanups" (Brendan
Jackman)
Clean up and update page allocator nomenclature, documentation, and
debug assertions.
It aligns internal FPI_ flags with the public "nolock" naming
convention, removes outdated internal implementation details from
high-level page allocator comments, and eliminates obsolete
VM_BUG_ON() assertions in allocation paths.
- "mm/mseal: further cleanups" (Lorenzo Stoakes)
Refactor and simplify the mseal implementation by clarifying API
boundaries and removing unnecessary code complexity.
It replaces generic do_mseal() usage outside the syscall with a
dedicated mseal_mmap_page_zero() helper for MMAP_PAGE_ZERO,
eliminates mm_struct parameters to enforce that sealing applies only
to current->mm, and streamlines overall logic and comments with no
functional changes intended.
- "mm/vmscan: fix swappiness=max and clean up per-node proactive
reclaim" (Ridong Chen)
Resolve reclaim behavior bugs and clean up function parameters across
memory reclaim paths
It fixes swappiness=max in both standard reclaim and MGLRU so
unswappable anonymous memory no longer falls back to evicting page
cache, ensures reclaim_store() returns accurate error codes instead
of collapsing all failures into -EAGAIN, and removes the obsolete
gfp_mask parameter from __node_reclaim().
- "mm: mincore: misc cleanups" (Kefeng Wang)
Clean up and simplifies the mincore code. Most importantly, it
removes the historical special behavior that always reports VM_PFNMAP
pages as non-resident.
- "mm/huge_memory: drop dead split helper variants" (Kiryl Shutsemau)
Two trivial cleanups in the folio split API
- "mm/damon: fix uninitialized DAMOS field and kunit exec expectation
bugs" (SJ Park)
Resolve minor operational and testing bugs in DAMON identified by
Sashiko. It initializes the damos->last_applied field to prevent
occasional efficiency degradation and fixes invalid memory accesses
in DAMON KUnit tests during test failure handling.
- "cleanup for stable_page_flags()" (Jinjiang Tu)
Clean up and refactor stable_page_flags() used by /proc/kpageflags
without altering functionality.
It uses BIT_ULL() to prevent shift-overflow warnings on 64-bit flag
bits, converts folio-specific flag checks to standard folio_test_*()
helpers, and removes redundant CONFIG_PAGE_IDLE_FLAG handling.
- "Batch unmap of uffd-wp file folios" (Dev Jain)
Extend batched folio unmapping support to file folios within
userfaultfd write-protect (uffd-wp) VMAs by adding batching
capabilities to pte_install_uffd_wp_if_needed().
This removes special-case restrictions on uffd-wp VMAs in
try_to_unmap_one(), significantly simplifying the function's control
flow and complexity.
- "mm/early_ioremap: clarify and clean up early_ioremap_reset()"
(Sang-Heon Jeon)
Clarify and clean up the architecture-specific usage of
__late_set_fixmap() and __late_clear_fixmap() after
early_ioremap_reset()
It adds explicit documentation regarding when early_ioremap_reset()
must be called and removes redundant macro definitions and reset
calls in the RISC-V and ARM64 architectures.
- "mm: fix reclaim storms in defrag_mode" (Johannes Weiner)
Address severe performance regressions, swap storms, and spurious
OOMs caused by vm.defrag_mode=1 under high memory pressure in Meta
production
It updates the page allocator slowpath so non-movable allocation
requests actively trigger direct reclaim and direct compaction at
pageblock_order scale, allowing them to claim whole pageblocks rather
than spinning unproductively.
- "zram: lockmap tweaks" (Sebastian Siewior)
Optimize and fix lockdep tracking for zram devices by consolidating
per-entry lockmaps and isolate lock classes across multiple instances
This reduces memory overhead by replacing per-entry lockdep_map
instances with a single map per struct zram, and assigns a dynamic
lock_class_key to each instance to prevent false deadlock reports
when different zram devices are backed by distinct filesystems.
* tag 'mm-stable-2026-08-18-18-39' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (501 commits)
selftests/mm: thuge-gen: fix test_shmget() for PAGE_SIZE check
selftests/mm: unpoison pages in memory-failure teardown
mm/shmem: downgrade final i_blocks check in shmem_evict_inode() to pr_warn()
mm/khugepaged: replace mutex_lock/mutex_unlock usage with guard macro
mm/zsmalloc: fix release order of locks in zs_page_migrate()
Documentation: zram: remove sections numbering
ksm: stop iterating VMAs when ksm_test_exit returns true
mm: fold userfaultfd_rwp() to false without CONFIG_ARCH_HAS_PTE_PROTNONE
mm/migrate: report RCU-tasks quiescent states in migrate_pages_batch()
zram: use a custom key for each zram object
zram: move lockmap to be per-zram instead per table
selftests/mm: fix gup_longterm EINVAL error message
mm: page_alloc: fix non-movable reclaim storm in defrag_mode
mm: page_alloc: move capture_control to the page allocator
mm: compaction: support non-movable compaction for pageblock requests
mm: page_alloc: __GFP_FS lockdep annotation for direct compaction
hugetlb: evaluate subpool free state while locked
mm/damon: remove trailing semicolons after function definitions
mm/damon/ops-common: prevent migration fallback to non-target nodes
mm/damon: update outdated comment about DAMOS filter handling
...
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Pull bitmap updates from Yury Norov:
"The usual set of fixes, cleanups and performance improvements together
with a couple of new tests:
- bitmap_find_next_zero_area_off() optimization (Sunyi)
- bitmap_find_next_zero_area_off(): return size when no zero area is
found (Yury)
- bitmap vs IDA vs Maple Tree performance test (Yury)
- get rid of cpumap_print_to_pagebuf() (Yury)
- use nr_node_ids in __nodemask_pr_numnodes() (Li RongQing)
- bitops: make the *_bit_le functions use unsigned long (Benjamin)
- bitmap scatter & gather test fix (Christophe)
- use __ASSEMBLER__ in bitmap header files (Thomas)"
* tag 'bitmap-for-7.3' of https://github.com/norov/linux: (25 commits)
lib: test bitmap vs IDA vs Maple Tree performance for region allocations
bitmap: Return size when no zero area is found
media: s5p-mfc: Treat bitmap size as allocation failure
crypto: ccp: Treat bitmap size as allocation failure
powerpc/msi: Treat bitmap size as allocation failure
ARM: dma-mapping: Treat bitmap size as allocation failure
bitmap: drop bitmap_next_set_region()
nodemask: reduce bitmap width to nr_node_ids in __nodemask_pr_numnodes()
bitmap: Properly initialise destination bitmap for scatter & gather test
lib/bitmap-str: get rid of cpumap_print_to_pagebuf()
perf: Use sysfs_emit() for cpumask show callbacks
PCI/sysfs: Use sysfs_emit() for cpumask show callbacks
RDMA/hfi1: Use sysfs_emit() for cpumask show helper
hwtracing: hisi_ptt: Use sysfs_emit() for cpumask show
fpga: dfl-fme-perf: Use sysfs_emit() for cpumask show
devfreq: Use sysfs_emit() for cpumask show callbacks
cpu: Use sysfs_emit() for cpumask show callback
x86/events: Use sysfs_emit() for cpumask show callbacks
powerpc: Use sysfs_emit() for cpumask show callbacks
arm: Use sysfs_emit() for cpumask show callbacks
...
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git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
Pull networking updates from Jakub Kicinski:
"One of the 'small improvements all over the place' releases for us.
It's hard to draw any direct comparisons because summer vacations
disrupted our patch processing (and presumably - generation) quite a
bit.
Quick and dirty count suggests we (Paolo and I) merged a very similar
number of net (632) and net-next (648) patches. This is not telling
the full story either because 1/3 to 1/2 of the net-next patches also
*seem* like AI-driven low priority fixes, cleanups and clarifications.
We are completely overwhelmed, of course. The glimmer of hope is that
we secured sufficient LLM budget and access (thank you Meta!) to run
reviews with multiple frontier models on each patch. This eliminates
some hallucinations. That said, in terms of review, the LLMs can only
do so much.
The sad truth is that our APIs (especially for rare events like PCIe
errors, timeouts etc) have always been racy, and now LLMs don't let us
ignore that. I expect our direction for the next release will be to
tweak the reviews a little bit more, but start shifting focus to
letting the LLMs take care of the busy work - managing patchwork,
automating common process complaints, editing commit messages, and
maybe applying patches which already got "reviewed-by" tags from
people we trust...
Core & protocols:
- A few steps lowering rtnl_lock dependence:
- per-netns netdev unregistration for select SW drivers (e.g.
veth, ipvlan, tunnels)
- rtnl_lock-less FIB rule changes (RTM_NEWRULE and RTM_DELRULE)
- prepare software drivers and TC qdiscs for rtnl_lock-less GET
- Support BIG TCP (>64kB TSO) in UDP tunnels (vxlan, geneve)
- Support buffers larger than PAGE_SIZE in devmem zero-copy API
- Improve MPTCP handling of extreme memory pressure handling, when
out-of-order queue had to be pruned
- Report the per-group user count via RTM_GETMULTICAST
- Expose the route deletion reason in RTM_DELROUTE
- Add a SO_RIGHTS_NOTRUNC option to UNIX sockets to enable more
useful handling of LSM denials when receiving SCM_RIGHTS messages:
instead of truncating the message at the first blocked fd, keep
every fd slot and store the LSM errno in the blocked slot
- IPv6 Segment Routing - support looking up the post-encap SID
(address) in a different/specified routing table
- Support PRP RedBox (interlink) creation
- Support per-nexthop UDP dst port in VXLAN
- Continue converting getsockopt callbacks in a number of protocols
to iov_iter
Ethernet:
- Merge initial CXL support for AMD/Solarflare NICs (shared branch
with the CXL tree)
- New drivers:
- ADIN1140 10BASE-T1S MACPHY
- Initial skeleton of Intel iXD and ZTE Dinghai drivers
- High-speed NICs:
- AMD/Pensando:
- support firmware flashing
- Cisco (enic):
- SR-IOV V2 admin channel and MBOX protocol
- Huawei (hns3):
- support for ethtool pfc_prevention_tout
- nVidia/Mellanox:
- support sharing bandwidth control across interfaces
of the same device
- Marvell (octeontx2-pf):
- link RQ page pools to netdev for Netlink stats
- Google vNIC:
- XDP metadata support for DQ RDA
- Microsoft vNIC:
- support forcing full-page RX buffers
- Other NICs:
- Synopsys IP:
- eic7700: support for eth1
- Microchip (lan743x):
- support for RMII interface
- Wangxun:
- support for ethtool -G and -C for VFs
- add Tx timeout and PCIe error handling
- Intel (igb/igc):
- RSS key get/set support
- support for forcing link speed without auto-negotiation
- Switches:
- NXP (dpaa2):
- support bonding/LAG offload
- Mediatek:
- mt7530: EN7528 support
- initial support for MT7628
- Micrel (ksz8/9):
- refactoring work to move towards library model
- PTP support for KSZ8463
- nVidia/Mellanox:
- support rtnl-lock-less ethtool callbacks
- Realtek:
- rtl8366rb: use generic RTL83xx code
- support SGMII and HSGMII for RTL8367S
- PHYs:
- Airoha:
- EcoNet EN7528 PHY support
- DAPU Telecom
- DAPU Telecom DAP8211R(I) Gigabit PHY support
- Realtek:
- support RTL8261C_CG
- support RTL8261D
Wireless:
- nl80211: per-link statistics support for multi-link operation
- mac80211: AQL/airtime-fairness support for multicast
- Merge Peripheral Authentication Service (PAS) / TEE support for
ath12k (shared branch with the firmware/qcom tree)
- New drivers:
- mm81x for Morse Micro Long-Range S1G devices
- nxpwifi for NXP devices (mostly forked off from mwifiex)
- Driver changes:
- Broadcom (brcmfmac):
- DPP support, some Cypress part update
- MediaTek (mt76):
- mt7928 support
- mt7925 NAN support
- mt7996 AP powersave improvements
- Qualcomm (ath12k):
- much kernel infrastructure integration work
- AHB platform MultiPD support
- Realtek (rt89):
- LED support
- RTL8922DE support
- dual-BT coex for RTL8922D
- Intel:
- new FW version support
Bluetooth:
- HCI: add support for Shorter Connection Interval (SCI) feature
- af_bluetooth: add minimal context analysis annotations
- Driver changes:
- Intel:
- add Bluetooth SAR revision 2 support
- add vendor_reset PCI sysfs for PLDR
- Mediatek:
- add USB IDs for MT7902 and MT7922 devices
- Realtek:
- add USB IDs for 8761CU and 8852BE devices
- NXP:
- add M.2 Bluetooth device support using pwrseq
Misc:
- DPLL support for manual/numerical oscillator control (NCO)
(implement in zl3073x)
- MCTP support for MCTP over USB v1.1 (DMTF DSP0283)
- Power-over-Ethernet: support Realtek PSE controllers
- Remove the IBM EHEA driver
- Remove tulip/xircom_cb driver"
* tag 'net-next-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1433 commits)
net/mlx5e: do not HW-GRO coalesce small frames
net: openvswitch: fix nf_connlabels leak in ovs_ct_init
net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()
net: openvswitch: fix flow mask use-after-free on flow deletion
sctp: stop processing a packet once its association is deleted
dpll: zl3073x: add PTP clock support
dpll: zl3073x: add channel ToD, phase step and TIE operations
dpll: zl3073x: scale poll interval proportionally to timeout
ptp: vmclock: prevent read-only mappings from becoming writable
ipv4: reject undersized MTUs in ip_do_fragment()
bonding: initialize err for empty target lists
net: dsa: initial support for MT7628 embedded switch
net: dsa: initial MT7628 tagging driver
net: phy: mediatek: add phy driver for MT7628 built-in Fast Ethernet PHYs
dt-bindings: net: dsa: add MT7628 ESW
net: pse-pd: realtek-pse-mcu: add UART transport
net: pse-pd: realtek-pse-mcu: add I2C transport
net: pse-pd: add Realtek PSE MCU core
dt-bindings: net: pse-pd: add bindings for Realtek PSE MCU
vsock: use sock_error() to consume sk_err after a failed connect
...
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