Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-02 00:51:44 +00:00
Code Issues Packages Projects Releases Wiki Activity
1,153,788 Commits 7 Branches 863 Tags 6.5 GiB
27db41a1f7
Commit Graph

19588 Commits

Author SHA1 Message Date
Mike Kravetz
e700898fa0 hugetlb: really allocate vma lock for all sharable vmas 
Commit bbff39cc6c ("hugetlb: allocate vma lock for all sharable vmas")
removed the pmd sharable checks in the vma lock helper routines.  However,
it left the functional version of helper routines behind #ifdef
CONFIG_ARCH_WANT_HUGE_PMD_SHARE.  Therefore, the vma lock is not being
used for sharable vmas on architectures that do not support pmd sharing. 
On these architectures, a potential fault/truncation race is exposed that
could leave pages in a hugetlb file past i_size until the file is removed.

Move the functional vma lock helpers outside the ifdef, and remove the
non-functional stubs.  Since the vma lock is not just for pmd sharing,
rename the routine __vma_shareable_flags_pmd.

Link: https://lkml.kernel.org/r/20221212235042.178355-1-mike.kravetz@oracle.com
Fixes: bbff39cc6c ("hugetlb: allocate vma lock for all sharable vmas")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: James Houghton <jthoughton@google.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-21 14:31:52 -08:00
Arnd Bergmann
7ba594d700 kmsan: export kmsan_handle_urb 
USB support can be in a loadable module, and this causes a link failure
with KMSAN:

ERROR: modpost: "kmsan_handle_urb" [drivers/usb/core/usbcore.ko] undefined!

Export the symbol so it can be used by this module.

Link: https://lkml.kernel.org/r/20221215162710.3802378-1-arnd@kernel.org
Fixes: 553a80188a ("kmsan: handle memory sent to/from USB")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-21 14:31:52 -08:00
Arnd Bergmann
aaa746ad8b kmsan: include linux/vmalloc.h 
This is needed for the vmap/vunmap declarations:

mm/kmsan/kmsan_test.c:316:9: error: implicit declaration of function 'vmap' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        vbuf = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
               ^
mm/kmsan/kmsan_test.c:316:29: error: use of undeclared identifier 'VM_MAP'
        vbuf = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
                                   ^
mm/kmsan/kmsan_test.c:322:3: error: implicit declaration of function 'vunmap' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                vunmap(vbuf);
                ^

Link: https://lkml.kernel.org/r/20221215163046.4079767-1-arnd@kernel.org
Fixes: 8ed691b02a ("kmsan: add tests for KMSAN")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-21 14:31:51 -08:00
Mathieu Desnoyers
38ce7c9bdf mm/mempolicy: fix memory leak in set_mempolicy_home_node system call 
When encountering any vma in the range with policy other than MPOL_BIND or
MPOL_PREFERRED_MANY, an error is returned without issuing a mpol_put on
the policy just allocated with mpol_dup().

This allows arbitrary users to leak kernel memory.

Link: https://lkml.kernel.org/r/20221215194621.202816-1-mathieu.desnoyers@efficios.com
Fixes: c6018b4b25 ("mm/mempolicy: add set_mempolicy_home_node syscall")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: <stable@vger.kernel.org>	[5.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-21 14:31:51 -08:00
Vlastimil Babka
6f12be792f mm, mremap: fix mremap() expanding vma with addr inside vma 
Since 6.1 we have noticed random rpm install failures that were tracked to
mremap() returning -ENOMEM and to commit ca3d76b0aa ("mm: add merging
after mremap resize").

The problem occurs when mremap() expands a VMA in place, but using an
starting address that's not vma->vm_start, but somewhere in the middle. 
The extension_pgoff calculation introduced by the commit is wrong in that
case, so vma_merge() fails due to pgoffs not being compatible.  Fix the
calculation.

By the way it seems that the situations, where rpm now expands a vma from
the middle, were made possible also due to that commit, thanks to the
improved vma merging.  Yet it should work just fine, except for the buggy
calculation.

Link: https://lkml.kernel.org/r/20221216163227.24648-1-vbabka@suse.cz
Reported-by: Jiri Slaby <jirislaby@kernel.org>
  Link: https://bugzilla.suse.com/show_bug.cgi?id=1206359
Fixes: ca3d76b0aa ("mm: add merging after mremap resize")
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jakub Matěna <matenajakub@gmail.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-21 14:31:51 -08:00
Linus Torvalds
1ea9d333ba - A few late-breaking minor fixups 
- Two minor feature patches which were awkwardly dependent on mm-nonmm.
   I need to set up a new branch to handle such things.
 -----BEGIN PGP SIGNATURE-----
 
 iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCY56V1wAKCRDdBJ7gKXxA
 juVQAP9pr5XBx880RJEil6skMCxYJmae8LvYShhvxJi9keot7QEA3wZRlGcllw/3
 fiHcsaBlXqtXBWUbtnMezcdP6gb3TQo=
 =8T1p
 -----END PGP SIGNATURE-----

Merge tag 'mm-stable-2022-12-17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull more mm updates from Andrew Morton:

 - A few late-breaking minor fixups

 - Two minor feature patches which were awkwardly dependent on mm-nonmm.
   I need to set up a new branch to handle such things.

* tag 'mm-stable-2022-12-17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  MAINTAINERS: zram: zsmalloc: Add an additional co-maintainer
  mm/kmemleak: use %pK to display kernel pointers in backtrace
  mm: use stack_depot for recording kmemleak's backtrace
  maple_tree: update copyright dates for test code
  maple_tree: fix mas_find_rev() comment
  mm/gup_test: free memory allocated via kvcalloc() using kvfree()
 2022-12-19 06:58:57 -06:00
Linus Torvalds
4f292c4de4 New Feature: 
* Randomize the per-cpu entry areas
 Cleanups:
 * Have CR3_ADDR_MASK use PHYSICAL_PAGE_MASK instead of open
   coding it
 * Move to "native" set_memory_rox() helper
 * Clean up pmd_get_atomic() and i386-PAE
 * Remove some unused page table size macros
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEV76QKkVc4xCGURexaDWVMHDJkrAFAmOc53UACgkQaDWVMHDJ
 krCUHw//SGZ+La0hLZLAiAiZTXLZZHpYkOmg1Oj1+11qSU11uZzTFqDpauhaKpRS
 cJCSh+D+RXe5e2ipgt0+Zl0hESLt7pJf8258OE4ra0DL/IlyO9uqruAs9Kn3eRS/
 Fk76nG8gdEU+JKJqpG02GqOLslYQuIy96n9hpuj1x25b614+uezPfC7S4XEat0NT
 MbJQ+jnVDf16aJIJkzT+iSwhubDVeh+bSHeO0SSCzX23WLUqDeg5NvlyxoCHGbBh
 UpUTWggV/0pYAkBKRHToeJs8qTWREwuuH/8JGewpe9A0tjdB5wyZfNL2PuracweN
 9MauXC3T5f0+Ca4yIIaPq1fF7Ny/PR2dBFihk27rOD0N7tjaZxNwal2pB1sZcmvZ
 +PAokjyTPVH5ZXjkMYGGAUe1jyjwr2+TgFSZxhTnDuGtyVQiY4pihGKOifLCX6tv
 x6khvYeTBw7wfaDRtKEAf+2kLHYn+71HszHP/8bNKX9T03h+Zf0i1wdZu5xbM5Gc
 VK2wR7bCC+UftJJYG0pldcHg2qaF19RBHK2tLwp7zngUv7lTbkKfkgKjre73KV2a
 D4b76lrqdUMo6UYwYdw7WtDyarZS4OVLq2DcNhwwMddBCaX8kyN5a4AqwQlZYJ0u
 dM+kuMofE8U3yMxmMhJimkZUsj09yLHIqfynY0jbAcU3nhKZZNY=
 =wwVF
 -----END PGP SIGNATURE-----

Merge tag 'x86_mm_for_6.2_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 mm updates from Dave Hansen:
 "New Feature:

   - Randomize the per-cpu entry areas

  Cleanups:

   - Have CR3_ADDR_MASK use PHYSICAL_PAGE_MASK instead of open coding it

   - Move to "native" set_memory_rox() helper

   - Clean up pmd_get_atomic() and i386-PAE

   - Remove some unused page table size macros"

* tag 'x86_mm_for_6.2_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (35 commits)
  x86/mm: Ensure forced page table splitting
  x86/kasan: Populate shadow for shared chunk of the CPU entry area
  x86/kasan: Add helpers to align shadow addresses up and down
  x86/kasan: Rename local CPU_ENTRY_AREA variables to shorten names
  x86/mm: Populate KASAN shadow for entire per-CPU range of CPU entry area
  x86/mm: Recompute physical address for every page of per-CPU CEA mapping
  x86/mm: Rename __change_page_attr_set_clr(.checkalias)
  x86/mm: Inhibit _PAGE_NX changes from cpa_process_alias()
  x86/mm: Untangle __change_page_attr_set_clr(.checkalias)
  x86/mm: Add a few comments
  x86/mm: Fix CR3_ADDR_MASK
  x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros
  mm: Convert __HAVE_ARCH_P..P_GET to the new style
  mm: Remove pointless barrier() after pmdp_get_lockless()
  x86/mm/pae: Get rid of set_64bit()
  x86_64: Remove pointless set_64bit() usage
  x86/mm/pae: Be consistent with pXXp_get_and_clear()
  x86/mm/pae: Use WRITE_ONCE()
  x86/mm/pae: Don't (ab)use atomic64
  mm/gup: Fix the lockless PMD access
  ...
 2022-12-17 14:06:53 -06:00
Clément Léger
3a6f33d86b mm/kmemleak: use %pK to display kernel pointers in backtrace 
Currently, %p is used to display kernel pointers in backtrace which result
in a hashed value that is not usable to correlate the address for debug. 
Use %pK which will respect the kptr_restrict configuration value and thus
allow to extract meaningful information from the backtrace.

Link: https://lkml.kernel.org/r/20221108094322.73492-1-clement.leger@bootlin.com
Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-15 16:37:49 -08:00
Zhaoyang Huang
56a61617dd mm: use stack_depot for recording kmemleak's backtrace 
Using stack_depot to record kmemleak's backtrace which has been
implemented on slub for reducing redundant information.

[akpm@linux-foundation.org: fix build - remove now-unused __save_stack_trace()]
[zhaoyang.huang@unisoc.com: v3]
  Link: https://lkml.kernel.org/r/1667101354-4669-1-git-send-email-zhaoyang.huang@unisoc.com
[akpm@linux-foundation.org: fix v3 layout oddities]
[akpm@linux-foundation.org: coding-style cleanups]
Link: https://lkml.kernel.org/r/1666864224-27541-1-git-send-email-zhaoyang.huang@unisoc.com
Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: ke.wang <ke.wang@unisoc.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zhaoyang Huang <huangzhaoyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-15 16:37:49 -08:00
David Hildenbrand
61b963b52f mm/gup_test: free memory allocated via kvcalloc() using kvfree() 
We have to free via kvfree(), not via kfree().

Link: https://lkml.kernel.org/r/20221212182018.264900-1-david@redhat.com
Fixes: c77369b437 ("mm/gup_test: start/stop/read functionality for PIN LONGTERM test")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-15 16:37:48 -08:00
Linus Torvalds
8fa590bf34 ARM64: 
* Enable the per-vcpu dirty-ring tracking mechanism, together with an
   option to keep the good old dirty log around for pages that are
   dirtied by something other than a vcpu.
 
 * Switch to the relaxed parallel fault handling, using RCU to delay
   page table reclaim and giving better performance under load.
 
 * Relax the MTE ABI, allowing a VMM to use the MAP_SHARED mapping option,
   which multi-process VMMs such as crosvm rely on (see merge commit 382b5b87a9:
   "Fix a number of issues with MTE, such as races on the tags being
   initialised vs the PG_mte_tagged flag as well as the lack of support
   for VM_SHARED when KVM is involved.  Patches from Catalin Marinas and
   Peter Collingbourne").
 
 * Merge the pKVM shadow vcpu state tracking that allows the hypervisor
   to have its own view of a vcpu, keeping that state private.
 
 * Add support for the PMUv3p5 architecture revision, bringing support
   for 64bit counters on systems that support it, and fix the
   no-quite-compliant CHAIN-ed counter support for the machines that
   actually exist out there.
 
 * Fix a handful of minor issues around 52bit VA/PA support (64kB pages
   only) as a prefix of the oncoming support for 4kB and 16kB pages.
 
 * Pick a small set of documentation and spelling fixes, because no
   good merge window would be complete without those.
 
 s390:
 
 * Second batch of the lazy destroy patches
 
 * First batch of KVM changes for kernel virtual != physical address support
 
 * Removal of a unused function
 
 x86:
 
 * Allow compiling out SMM support
 
 * Cleanup and documentation of SMM state save area format
 
 * Preserve interrupt shadow in SMM state save area
 
 * Respond to generic signals during slow page faults
 
 * Fixes and optimizations for the non-executable huge page errata fix.
 
 * Reprogram all performance counters on PMU filter change
 
 * Cleanups to Hyper-V emulation and tests
 
 * Process Hyper-V TLB flushes from a nested guest (i.e. from a L2 guest
   running on top of a L1 Hyper-V hypervisor)
 
 * Advertise several new Intel features
 
 * x86 Xen-for-KVM:
 
 ** Allow the Xen runstate information to cross a page boundary
 
 ** Allow XEN_RUNSTATE_UPDATE flag behaviour to be configured
 
 ** Add support for 32-bit guests in SCHEDOP_poll
 
 * Notable x86 fixes and cleanups:
 
 ** One-off fixes for various emulation flows (SGX, VMXON, NRIPS=0).
 
 ** Reinstate IBPB on emulated VM-Exit that was incorrectly dropped a few
    years back when eliminating unnecessary barriers when switching between
    vmcs01 and vmcs02.
 
 ** Clean up vmread_error_trampoline() to make it more obvious that params
    must be passed on the stack, even for x86-64.
 
 ** Let userspace set all supported bits in MSR_IA32_FEAT_CTL irrespective
    of the current guest CPUID.
 
 ** Fudge around a race with TSC refinement that results in KVM incorrectly
    thinking a guest needs TSC scaling when running on a CPU with a
    constant TSC, but no hardware-enumerated TSC frequency.
 
 ** Advertise (on AMD) that the SMM_CTL MSR is not supported
 
 ** Remove unnecessary exports
 
 Generic:
 
 * Support for responding to signals during page faults; introduces
   new FOLL_INTERRUPTIBLE flag that was reviewed by mm folks
 
 Selftests:
 
 * Fix an inverted check in the access tracking perf test, and restore
   support for asserting that there aren't too many idle pages when
   running on bare metal.
 
 * Fix build errors that occur in certain setups (unsure exactly what is
   unique about the problematic setup) due to glibc overriding
   static_assert() to a variant that requires a custom message.
 
 * Introduce actual atomics for clear/set_bit() in selftests
 
 * Add support for pinning vCPUs in dirty_log_perf_test.
 
 * Rename the so called "perf_util" framework to "memstress".
 
 * Add a lightweight psuedo RNG for guest use, and use it to randomize
   the access pattern and write vs. read percentage in the memstress tests.
 
 * Add a common ucall implementation; code dedup and pre-work for running
   SEV (and beyond) guests in selftests.
 
 * Provide a common constructor and arch hook, which will eventually be
   used by x86 to automatically select the right hypercall (AMD vs. Intel).
 
 * A bunch of added/enabled/fixed selftests for ARM64, covering memslots,
   breakpoints, stage-2 faults and access tracking.
 
 * x86-specific selftest changes:
 
 ** Clean up x86's page table management.
 
 ** Clean up and enhance the "smaller maxphyaddr" test, and add a related
    test to cover generic emulation failure.
 
 ** Clean up the nEPT support checks.
 
 ** Add X86_PROPERTY_* framework to retrieve multi-bit CPUID values.
 
 ** Fix an ordering issue in the AMX test introduced by recent conversions
    to use kvm_cpu_has(), and harden the code to guard against similar bugs
    in the future.  Anything that tiggers caching of KVM's supported CPUID,
    kvm_cpu_has() in this case, effectively hides opt-in XSAVE features if
    the caching occurs before the test opts in via prctl().
 
 Documentation:
 
 * Remove deleted ioctls from documentation
 
 * Clean up the docs for the x86 MSR filter.
 
 * Various fixes
 -----BEGIN PGP SIGNATURE-----
 
 iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmOaFrcUHHBib256aW5p
 QHJlZGhhdC5jb20ACgkQv/vSX3jHroPemQgAq49excg2Cc+EsHnZw3vu/QWdA0Rt
 KhL3OgKxuHNjCbD2O9n2t5di7eJOTQ7F7T0eDm3xPTr4FS8LQ2327/mQePU/H2CF
 mWOpq9RBWLzFsSTeVA2Mz9TUTkYSnDHYuRsBvHyw/n9cL76BWVzjImldFtjYjjex
 yAwl8c5itKH6bc7KO+5ydswbvBzODkeYKUSBNdbn6m0JGQST7XppNwIAJvpiHsii
 Qgpk0e4Xx9q4PXG/r5DedI6BlufBsLhv0aE9SHPzyKH3JbbUFhJYI8ZD5OhBQuYW
 MwxK2KlM5Jm5ud2NZDDlsMmmvd1lnYCFDyqNozaKEWC1Y5rq1AbMa51fXA==
 =QAYX
 -----END PGP SIGNATURE-----

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm updates from Paolo Bonzini:
 "ARM64:

   - Enable the per-vcpu dirty-ring tracking mechanism, together with an
     option to keep the good old dirty log around for pages that are
     dirtied by something other than a vcpu.

   - Switch to the relaxed parallel fault handling, using RCU to delay
     page table reclaim and giving better performance under load.

   - Relax the MTE ABI, allowing a VMM to use the MAP_SHARED mapping
     option, which multi-process VMMs such as crosvm rely on (see merge
     commit 382b5b87a9: "Fix a number of issues with MTE, such as
     races on the tags being initialised vs the PG_mte_tagged flag as
     well as the lack of support for VM_SHARED when KVM is involved.
     Patches from Catalin Marinas and Peter Collingbourne").

   - Merge the pKVM shadow vcpu state tracking that allows the
     hypervisor to have its own view of a vcpu, keeping that state
     private.

   - Add support for the PMUv3p5 architecture revision, bringing support
     for 64bit counters on systems that support it, and fix the
     no-quite-compliant CHAIN-ed counter support for the machines that
     actually exist out there.

   - Fix a handful of minor issues around 52bit VA/PA support (64kB
     pages only) as a prefix of the oncoming support for 4kB and 16kB
     pages.

   - Pick a small set of documentation and spelling fixes, because no
     good merge window would be complete without those.

  s390:

   - Second batch of the lazy destroy patches

   - First batch of KVM changes for kernel virtual != physical address
     support

   - Removal of a unused function

  x86:

   - Allow compiling out SMM support

   - Cleanup and documentation of SMM state save area format

   - Preserve interrupt shadow in SMM state save area

   - Respond to generic signals during slow page faults

   - Fixes and optimizations for the non-executable huge page errata
     fix.

   - Reprogram all performance counters on PMU filter change

   - Cleanups to Hyper-V emulation and tests

   - Process Hyper-V TLB flushes from a nested guest (i.e. from a L2
     guest running on top of a L1 Hyper-V hypervisor)

   - Advertise several new Intel features

   - x86 Xen-for-KVM:

      - Allow the Xen runstate information to cross a page boundary

      - Allow XEN_RUNSTATE_UPDATE flag behaviour to be configured

      - Add support for 32-bit guests in SCHEDOP_poll

   - Notable x86 fixes and cleanups:

      - One-off fixes for various emulation flows (SGX, VMXON, NRIPS=0).

      - Reinstate IBPB on emulated VM-Exit that was incorrectly dropped
        a few years back when eliminating unnecessary barriers when
        switching between vmcs01 and vmcs02.

      - Clean up vmread_error_trampoline() to make it more obvious that
        params must be passed on the stack, even for x86-64.

      - Let userspace set all supported bits in MSR_IA32_FEAT_CTL
        irrespective of the current guest CPUID.

      - Fudge around a race with TSC refinement that results in KVM
        incorrectly thinking a guest needs TSC scaling when running on a
        CPU with a constant TSC, but no hardware-enumerated TSC
        frequency.

      - Advertise (on AMD) that the SMM_CTL MSR is not supported

      - Remove unnecessary exports

  Generic:

   - Support for responding to signals during page faults; introduces
     new FOLL_INTERRUPTIBLE flag that was reviewed by mm folks

  Selftests:

   - Fix an inverted check in the access tracking perf test, and restore
     support for asserting that there aren't too many idle pages when
     running on bare metal.

   - Fix build errors that occur in certain setups (unsure exactly what
     is unique about the problematic setup) due to glibc overriding
     static_assert() to a variant that requires a custom message.

   - Introduce actual atomics for clear/set_bit() in selftests

   - Add support for pinning vCPUs in dirty_log_perf_test.

   - Rename the so called "perf_util" framework to "memstress".

   - Add a lightweight psuedo RNG for guest use, and use it to randomize
     the access pattern and write vs. read percentage in the memstress
     tests.

   - Add a common ucall implementation; code dedup and pre-work for
     running SEV (and beyond) guests in selftests.

   - Provide a common constructor and arch hook, which will eventually
     be used by x86 to automatically select the right hypercall (AMD vs.
     Intel).

   - A bunch of added/enabled/fixed selftests for ARM64, covering
     memslots, breakpoints, stage-2 faults and access tracking.

   - x86-specific selftest changes:

      - Clean up x86's page table management.

      - Clean up and enhance the "smaller maxphyaddr" test, and add a
        related test to cover generic emulation failure.

      - Clean up the nEPT support checks.

      - Add X86_PROPERTY_* framework to retrieve multi-bit CPUID values.

      - Fix an ordering issue in the AMX test introduced by recent
        conversions to use kvm_cpu_has(), and harden the code to guard
        against similar bugs in the future. Anything that tiggers
        caching of KVM's supported CPUID, kvm_cpu_has() in this case,
        effectively hides opt-in XSAVE features if the caching occurs
        before the test opts in via prctl().

  Documentation:

   - Remove deleted ioctls from documentation

   - Clean up the docs for the x86 MSR filter.

   - Various fixes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (361 commits)
  KVM: x86: Add proper ReST tables for userspace MSR exits/flags
  KVM: selftests: Allocate ucall pool from MEM_REGION_DATA
  KVM: arm64: selftests: Align VA space allocator with TTBR0
  KVM: arm64: Fix benign bug with incorrect use of VA_BITS
  KVM: arm64: PMU: Fix period computation for 64bit counters with 32bit overflow
  KVM: x86: Advertise that the SMM_CTL MSR is not supported
  KVM: x86: remove unnecessary exports
  KVM: selftests: Fix spelling mistake "probabalistic" -> "probabilistic"
  tools: KVM: selftests: Convert clear/set_bit() to actual atomics
  tools: Drop "atomic_" prefix from atomic test_and_set_bit()
  tools: Drop conflicting non-atomic test_and_{clear,set}_bit() helpers
  KVM: selftests: Use non-atomic clear/set bit helpers in KVM tests
  perf tools: Use dedicated non-atomic clear/set bit helpers
  tools: Take @bit as an "unsigned long" in {clear,set}_bit() helpers
  KVM: arm64: selftests: Enable single-step without a "full" ucall()
  KVM: x86: fix APICv/x2AVIC disabled when vm reboot by itself
  KVM: Remove stale comment about KVM_REQ_UNHALT
  KVM: Add missing arch for KVM_CREATE_DEVICE and KVM_{SET,GET}_DEVICE_ATTR
  KVM: Reference to kvm_userspace_memory_region in doc and comments
  KVM: Delete all references to removed KVM_SET_MEMORY_ALIAS ioctl
  ...
 2022-12-15 11:12:21 -08:00
Peter Zijlstra
eb780dcae0 mm: Remove pointless barrier() after pmdp_get_lockless() 
pmdp_get_lockless() should itself imply any ordering required.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221022114425.298833095%40infradead.org
 2022-12-15 10:37:27 -08:00
Peter Zijlstra
1180e732c9 mm/gup: Fix the lockless PMD access 
On architectures where the PTE/PMD is larger than the native word size
(i386-PAE for example), READ_ONCE() can do the wrong thing. Use
pmdp_get_lockless() just like we use ptep_get_lockless().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221022114424.906110403%40infradead.org
 2022-12-15 10:37:27 -08:00
Peter Zijlstra
dab6e71742 mm: Rename pmd_read_atomic() 
There's no point in having the identical routines for PTE/PMD have
different names.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221022114424.841277397%40infradead.org
 2022-12-15 10:37:27 -08:00
Peter Zijlstra
6ca297d478 mm: Rename GUP_GET_PTE_LOW_HIGH 
Since it no longer applies to only PTEs, rename it to PXX.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221022114424.776404066%40infradead.org
 2022-12-15 10:37:27 -08:00
Linus Torvalds
48ea09cdda hardening updates for v6.2-rc1 
- Convert flexible array members, fix -Wstringop-overflow warnings,
   and fix KCFI function type mismatches that went ignored by
   maintainers (Gustavo A. R. Silva, Nathan Chancellor, Kees Cook).
 
 - Remove the remaining side-effect users of ksize() by converting
   dma-buf, btrfs, and coredump to using kmalloc_size_roundup(),
   add more __alloc_size attributes, and introduce full testing
   of all allocator functions. Finally remove the ksize() side-effect
   so that each allocation-aware checker can finally behave without
   exceptions.
 
 - Introduce oops_limit (default 10,000) and warn_limit (default off)
   to provide greater granularity of control for panic_on_oops and
   panic_on_warn (Jann Horn, Kees Cook).
 
 - Introduce overflows_type() and castable_to_type() helpers for
   cleaner overflow checking.
 
 - Improve code generation for strscpy() and update str*() kern-doc.
 
 - Convert strscpy and sigphash tests to KUnit, and expand memcpy
   tests.
 
 - Always use a non-NULL argument for prepare_kernel_cred().
 
 - Disable structleak plugin in FORTIFY KUnit test (Anders Roxell).
 
 - Adjust orphan linker section checking to respect CONFIG_WERROR
   (Xin Li).
 
 - Make sure siginfo is cleared for forced SIGKILL (haifeng.xu).
 
 - Fix um vs FORTIFY warnings for always-NULL arguments.
 -----BEGIN PGP SIGNATURE-----
 
 iQJKBAABCgA0FiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmOZSOoWHGtlZXNjb29r
 QGNocm9taXVtLm9yZwAKCRCJcvTf3G3AJjAAD/0YkvpU7f03f8hcQMJK6wv//24K
 AW41hEaBikq9RcmkuvkLLrJRibGgZ5O2xUkUkxRs/HxhkhrZ0kEw8sbwZe8MoWls
 F4Y9+TDjsrdHmjhfcBZdLnVxwcKK5wlaEcpjZXtbsfcdhx3TbgcDA23YELl5t0K+
 I11j4kYmf9SLl4CwIrSP5iACml8CBHARDh8oIMF7FT/LrjNbM8XkvBcVVT6hTbOV
 yjgA8WP2e9GXvj9GzKgqvd0uE/kwPkVAeXLNFWopPi4FQ8AWjlxbBZR0gamA6/EB
 d7TIs0ifpVU2JGQaTav4xO6SsFMj3ntoUI0qIrFaTxZAvV4KYGrPT/Kwz1O4SFaG
 rN5lcxseQbPQSBTFNG4zFjpywTkVCgD2tZqDwz5Rrmiraz0RyIokCN+i4CD9S0Ds
 oEd8JSyLBk1sRALczkuEKo0an5AyC9YWRcBXuRdIHpLo08PsbeUUSe//4pe303cw
 0ApQxYOXnrIk26MLElTzSMImlSvlzW6/5XXzL9ME16leSHOIfDeerPnc9FU9Eb3z
 ODv22z6tJZ9H/apSUIHZbMciMbbVTZ8zgpkfydr08o87b342N/ncYHZ5cSvQ6DWb
 jS5YOIuvl46/IhMPT16qWC8p0bP5YhxoPv5l6Xr0zq0ooEj0E7keiD/SzoLvW+Qs
 AHXcibguPRQBPAdiPQ==
 =yaaN
 -----END PGP SIGNATURE-----

Merge tag 'hardening-v6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull kernel hardening updates from Kees Cook:

 - Convert flexible array members, fix -Wstringop-overflow warnings, and
   fix KCFI function type mismatches that went ignored by maintainers
   (Gustavo A. R. Silva, Nathan Chancellor, Kees Cook)

 - Remove the remaining side-effect users of ksize() by converting
   dma-buf, btrfs, and coredump to using kmalloc_size_roundup(), add
   more __alloc_size attributes, and introduce full testing of all
   allocator functions. Finally remove the ksize() side-effect so that
   each allocation-aware checker can finally behave without exceptions

 - Introduce oops_limit (default 10,000) and warn_limit (default off) to
   provide greater granularity of control for panic_on_oops and
   panic_on_warn (Jann Horn, Kees Cook)

 - Introduce overflows_type() and castable_to_type() helpers for cleaner
   overflow checking

 - Improve code generation for strscpy() and update str*() kern-doc

 - Convert strscpy and sigphash tests to KUnit, and expand memcpy tests

 - Always use a non-NULL argument for prepare_kernel_cred()

 - Disable structleak plugin in FORTIFY KUnit test (Anders Roxell)

 - Adjust orphan linker section checking to respect CONFIG_WERROR (Xin
   Li)

 - Make sure siginfo is cleared for forced SIGKILL (haifeng.xu)

 - Fix um vs FORTIFY warnings for always-NULL arguments

* tag 'hardening-v6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (31 commits)
  ksmbd: replace one-element arrays with flexible-array members
  hpet: Replace one-element array with flexible-array member
  um: virt-pci: Avoid GCC non-NULL warning
  signal: Initialize the info in ksignal
  lib: fortify_kunit: build without structleak plugin
  panic: Expose "warn_count" to sysfs
  panic: Introduce warn_limit
  panic: Consolidate open-coded panic_on_warn checks
  exit: Allow oops_limit to be disabled
  exit: Expose "oops_count" to sysfs
  exit: Put an upper limit on how often we can oops
  panic: Separate sysctl logic from CONFIG_SMP
  mm/pgtable: Fix multiple -Wstringop-overflow warnings
  mm: Make ksize() a reporting-only function
  kunit/fortify: Validate __alloc_size attribute results
  drm/sti: Fix return type of sti_{dvo,hda,hdmi}_connector_mode_valid()
  drm/fsl-dcu: Fix return type of fsl_dcu_drm_connector_mode_valid()
  driver core: Add __alloc_size hint to devm allocators
  overflow: Introduce overflows_type() and castable_to_type()
  coredump: Proactively round up to kmalloc bucket size
  ...
 2022-12-14 12:20:00 -08:00
Linus Torvalds
e2ca6ba6ba MM patches for 6.2-rc1. 
- More userfaultfs work from Peter Xu.
 
 - Several convert-to-folios series from Sidhartha Kumar and Huang Ying.
 
 - Some filemap cleanups from Vishal Moola.
 
 - David Hildenbrand added the ability to selftest anon memory COW handling.
 
 - Some cpuset simplifications from Liu Shixin.
 
 - Addition of vmalloc tracing support by Uladzislau Rezki.
 
 - Some pagecache folioifications and simplifications from Matthew Wilcox.
 
 - A pagemap cleanup from Kefeng Wang: we have VM_ACCESS_FLAGS, so use it.
 
 - Miguel Ojeda contributed some cleanups for our use of the
   __no_sanitize_thread__ gcc keyword.  This series shold have been in the
   non-MM tree, my bad.
 
 - Naoya Horiguchi improved the interaction between memory poisoning and
   memory section removal for huge pages.
 
 - DAMON cleanups and tuneups from SeongJae Park
 
 - Tony Luck fixed the handling of COW faults against poisoned pages.
 
 - Peter Xu utilized the PTE marker code for handling swapin errors.
 
 - Hugh Dickins reworked compound page mapcount handling, simplifying it
   and making it more efficient.
 
 - Removal of the autonuma savedwrite infrastructure from Nadav Amit and
   David Hildenbrand.
 
 - zram support for multiple compression streams from Sergey Senozhatsky.
 
 - David Hildenbrand reworked the GUP code's R/O long-term pinning so
   that drivers no longer need to use the FOLL_FORCE workaround which
   didn't work very well anyway.
 
 - Mel Gorman altered the page allocator so that local IRQs can remnain
   enabled during per-cpu page allocations.
 
 - Vishal Moola removed the try_to_release_page() wrapper.
 
 - Stefan Roesch added some per-BDI sysfs tunables which are used to
   prevent network block devices from dirtying excessive amounts of
   pagecache.
 
 - David Hildenbrand did some cleanup and repair work on KSM COW
   breaking.
 
 - Nhat Pham and Johannes Weiner have implemented writeback in zswap's
   zsmalloc backend.
 
 - Brian Foster has fixed a longstanding corner-case oddity in
   file[map]_write_and_wait_range().
 
 - sparse-vmemmap changes for MIPS, LoongArch and NIOS2 from Feiyang
   Chen.
 
 - Shiyang Ruan has done some work on fsdax, to make its reflink mode
   work better under xfstests.  Better, but still not perfect.
 
 - Christoph Hellwig has removed the .writepage() method from several
   filesystems.  They only need .writepages().
 
 - Yosry Ahmed wrote a series which fixes the memcg reclaim target
   beancounting.
 
 - David Hildenbrand has fixed some of our MM selftests for 32-bit
   machines.
 
 - Many singleton patches, as usual.
 -----BEGIN PGP SIGNATURE-----
 
 iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCY5j6ZwAKCRDdBJ7gKXxA
 jkDYAP9qNeVqp9iuHjZNTqzMXkfmJPsw2kmy2P+VdzYVuQRcJgEAgoV9d7oMq4ml
 CodAgiA51qwzId3GRytIo/tfWZSezgA=
 =d19R
 -----END PGP SIGNATURE-----

Merge tag 'mm-stable-2022-12-13' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - More userfaultfs work from Peter Xu

 - Several convert-to-folios series from Sidhartha Kumar and Huang Ying

 - Some filemap cleanups from Vishal Moola

 - David Hildenbrand added the ability to selftest anon memory COW
   handling

 - Some cpuset simplifications from Liu Shixin

 - Addition of vmalloc tracing support by Uladzislau Rezki

 - Some pagecache folioifications and simplifications from Matthew
   Wilcox

 - A pagemap cleanup from Kefeng Wang: we have VM_ACCESS_FLAGS, so use
   it

 - Miguel Ojeda contributed some cleanups for our use of the
   __no_sanitize_thread__ gcc keyword.

   This series should have been in the non-MM tree, my bad

 - Naoya Horiguchi improved the interaction between memory poisoning and
   memory section removal for huge pages

 - DAMON cleanups and tuneups from SeongJae Park

 - Tony Luck fixed the handling of COW faults against poisoned pages

 - Peter Xu utilized the PTE marker code for handling swapin errors

 - Hugh Dickins reworked compound page mapcount handling, simplifying it
   and making it more efficient

 - Removal of the autonuma savedwrite infrastructure from Nadav Amit and
   David Hildenbrand

 - zram support for multiple compression streams from Sergey Senozhatsky

 - David Hildenbrand reworked the GUP code's R/O long-term pinning so
   that drivers no longer need to use the FOLL_FORCE workaround which
   didn't work very well anyway

 - Mel Gorman altered the page allocator so that local IRQs can remnain
   enabled during per-cpu page allocations

 - Vishal Moola removed the try_to_release_page() wrapper

 - Stefan Roesch added some per-BDI sysfs tunables which are used to
   prevent network block devices from dirtying excessive amounts of
   pagecache

 - David Hildenbrand did some cleanup and repair work on KSM COW
   breaking

 - Nhat Pham and Johannes Weiner have implemented writeback in zswap's
   zsmalloc backend

 - Brian Foster has fixed a longstanding corner-case oddity in
   file[map]_write_and_wait_range()

 - sparse-vmemmap changes for MIPS, LoongArch and NIOS2 from Feiyang
   Chen

 - Shiyang Ruan has done some work on fsdax, to make its reflink mode
   work better under xfstests. Better, but still not perfect

 - Christoph Hellwig has removed the .writepage() method from several
   filesystems. They only need .writepages()

 - Yosry Ahmed wrote a series which fixes the memcg reclaim target
   beancounting

 - David Hildenbrand has fixed some of our MM selftests for 32-bit
   machines

 - Many singleton patches, as usual

* tag 'mm-stable-2022-12-13' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (313 commits)
  mm/hugetlb: set head flag before setting compound_order in __prep_compound_gigantic_folio
  mm: mmu_gather: allow more than one batch of delayed rmaps
  mm: fix typo in struct pglist_data code comment
  kmsan: fix memcpy tests
  mm: add cond_resched() in swapin_walk_pmd_entry()
  mm: do not show fs mm pc for VM_LOCKONFAULT pages
  selftests/vm: ksm_functional_tests: fixes for 32bit
  selftests/vm: cow: fix compile warning on 32bit
  selftests/vm: madv_populate: fix missing MADV_POPULATE_(READ|WRITE) definitions
  mm/gup_test: fix PIN_LONGTERM_TEST_READ with highmem
  mm,thp,rmap: fix races between updates of subpages_mapcount
  mm: memcg: fix swapcached stat accounting
  mm: add nodes= arg to memory.reclaim
  mm: disable top-tier fallback to reclaim on proactive reclaim
  selftests: cgroup: make sure reclaim target memcg is unprotected
  selftests: cgroup: refactor proactive reclaim code to reclaim_until()
  mm: memcg: fix stale protection of reclaim target memcg
  mm/mmap: properly unaccount memory on mas_preallocate() failure
  omfs: remove ->writepage
  jfs: remove ->writepage
  ...
 2022-12-13 19:29:45 -08:00
Linus Torvalds
ce8a79d560 for-6.2/block-2022-12-08 
-----BEGIN PGP SIGNATURE-----
 
 iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAmOScsgQHGF4Ym9lQGtl
 cm5lbC5kawAKCRD301j7KXHgpi5ID/9pLXFYOq1+uDjU0KO/MdjMjK8Ukr34lCnk
 WkajRLheE8JBKOFDE54XJk56sQSZHX9bTWqziar0h1fioh7FlQR/tVvzsERCm2M9
 2y9THJNJygC68wgybStyiKlshFjl7TD7Kv5N9Y3xP3mkQygT+D6o8fXZk5xQbYyH
 YdFSoq4rJVHxRL03yzQiReGGIYdOUEQQh8l1FiLwLlKa3lXAey1KuxWIzksVN0KK
 aZB4QhiBpOiPgDHUVisq2XtyQjpZ2byoCImPzgrcqk9Jo4esvm/e6esrg4xlsvII
 LKFFkTmbVqjUZtFjqakFHmfuzVor4nU5f+xb90ZHExuuODYckkxWp5rWhf9QwqqI
 0ik6WYgI1/5vnHnX8f2DYzOFQf9qa/rLgg0CshyUODlD6RfHa9vntqYvlIFkmOBd
 Q7KblIoK8YTzUS1M+v7X8JQ7gDR2KwygH37Da2KJS+vgvfIb8kJGr1ZORuhJuJJ7
 Bl69gaNkHTHrqufp7UI64YXfueeuNu2J9z3zwzGoxeaFaofF/phDn0/2gCQE1fQI
 XBhsMw+ETqI6B2SPHMnzYDu2DM1S8ZTOYQlaD4G3uqgWnAM1tG707395uAy5yu4n
 D5azU1fVG4UocoNIyPujpaoSRs2zWZycEFEeUQkhyDDww/j4hlHi6H33eOnk0zsr
 wxzFGfvHfw==
 =k/vv
 -----END PGP SIGNATURE-----

Merge tag 'for-6.2/block-2022-12-08' of git://git.kernel.dk/linux

Pull block updates from Jens Axboe:

 - NVMe pull requests via Christoph:
      - Support some passthrough commands without CAP_SYS_ADMIN (Kanchan
        Joshi)
      - Refactor PCIe probing and reset (Christoph Hellwig)
      - Various fabrics authentication fixes and improvements (Sagi
        Grimberg)
      - Avoid fallback to sequential scan due to transient issues (Uday
        Shankar)
      - Implement support for the DEAC bit in Write Zeroes (Christoph
        Hellwig)
      - Allow overriding the IEEE OUI and firmware revision in configfs
        for nvmet (Aleksandr Miloserdov)
      - Force reconnect when number of queue changes in nvmet (Daniel
        Wagner)
      - Minor fixes and improvements (Uros Bizjak, Joel Granados, Sagi
        Grimberg, Christoph Hellwig, Christophe JAILLET)
      - Fix and cleanup nvme-fc req allocation (Chaitanya Kulkarni)
      - Use the common tagset helpers in nvme-pci driver (Christoph
        Hellwig)
      - Cleanup the nvme-pci removal path (Christoph Hellwig)
      - Use kstrtobool() instead of strtobool (Christophe JAILLET)
      - Allow unprivileged passthrough of Identify Controller (Joel
        Granados)
      - Support io stats on the mpath device (Sagi Grimberg)
      - Minor nvmet cleanup (Sagi Grimberg)

 - MD pull requests via Song:
      - Code cleanups (Christoph)
      - Various fixes

 - Floppy pull request from Denis:
      - Fix a memory leak in the init error path (Yuan)

 - Series fixing some batch wakeup issues with sbitmap (Gabriel)

 - Removal of the pktcdvd driver that was deprecated more than 5 years
   ago, and subsequent removal of the devnode callback in struct
   block_device_operations as no users are now left (Greg)

 - Fix for partition read on an exclusively opened bdev (Jan)

 - Series of elevator API cleanups (Jinlong, Christoph)

 - Series of fixes and cleanups for blk-iocost (Kemeng)

 - Series of fixes and cleanups for blk-throttle (Kemeng)

 - Series adding concurrent support for sync queues in BFQ (Yu)

 - Series bringing drbd a bit closer to the out-of-tree maintained
   version (Christian, Joel, Lars, Philipp)

 - Misc drbd fixes (Wang)

 - blk-wbt fixes and tweaks for enable/disable (Yu)

 - Fixes for mq-deadline for zoned devices (Damien)

 - Add support for read-only and offline zones for null_blk
   (Shin'ichiro)

 - Series fixing the delayed holder tracking, as used by DM (Yu,
   Christoph)

 - Series enabling bio alloc caching for IRQ based IO (Pavel)

 - Series enabling userspace peer-to-peer DMA (Logan)

 - BFQ waker fixes (Khazhismel)

 - Series fixing elevator refcount issues (Christoph, Jinlong)

 - Series cleaning up references around queue destruction (Christoph)

 - Series doing quiesce by tagset, enabling cleanups in drivers
   (Christoph, Chao)

 - Series untangling the queue kobject and queue references (Christoph)

 - Misc fixes and cleanups (Bart, David, Dawei, Jinlong, Kemeng, Ye,
   Yang, Waiman, Shin'ichiro, Randy, Pankaj, Christoph)

* tag 'for-6.2/block-2022-12-08' of git://git.kernel.dk/linux: (247 commits)
  blktrace: Fix output non-blktrace event when blk_classic option enabled
  block: sed-opal: Don't include <linux/kernel.h>
  sed-opal: allow using IOC_OPAL_SAVE for locking too
  blk-cgroup: Fix typo in comment
  block: remove bio_set_op_attrs
  nvmet: don't open-code NVME_NS_ATTR_RO enumeration
  nvme-pci: use the tagset alloc/free helpers
  nvme: add the Apple shared tag workaround to nvme_alloc_io_tag_set
  nvme: only set reserved_tags in nvme_alloc_io_tag_set for fabrics controllers
  nvme: consolidate setting the tagset flags
  nvme: pass nr_maps explicitly to nvme_alloc_io_tag_set
  block: bio_copy_data_iter
  nvme-pci: split out a nvme_pci_ctrl_is_dead helper
  nvme-pci: return early on ctrl state mismatch in nvme_reset_work
  nvme-pci: rename nvme_disable_io_queues
  nvme-pci: cleanup nvme_suspend_queue
  nvme-pci: remove nvme_pci_disable
  nvme-pci: remove nvme_disable_admin_queue
  nvme: merge nvme_shutdown_ctrl into nvme_disable_ctrl
  nvme: use nvme_wait_ready in nvme_shutdown_ctrl
  ...
 2022-12-13 10:43:59 -08:00
Linus Torvalds
02bf43c7b7 fs.xattr.simple.rework.rbtree.rwlock.v6.2 
-----BEGIN PGP SIGNATURE-----
 
 iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCY5bw/wAKCRCRxhvAZXjc
 ol79AQCsHS9s78dLUvdasfQ1023dyF9zaQ8XGkDO6tRssJzGAAD7B8odxDsfQgjQ
 Qzzn9YPZVUgHjd4xBg21UVPmRP5snwQ=
 =wYgr
 -----END PGP SIGNATURE-----

Merge tag 'fs.xattr.simple.rework.rbtree.rwlock.v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping

Pull simple-xattr updates from Christian Brauner:
 "This ports the simple xattr infrastucture to rely on a simple rbtree
  protected by a read-write lock instead of a linked list protected by a
  spinlock.

  A while ago we received reports about scaling issues for filesystems
  using the simple xattr infrastructure that also support setting a
  larger number of xattrs. Specifically, cgroups and tmpfs.

  Both cgroupfs and tmpfs can be mounted by unprivileged users in
  unprivileged containers and root in an unprivileged container can set
  an unrestricted number of security.* xattrs and privileged users can
  also set unlimited trusted.* xattrs. A few more words on further that
  below. Other xattrs such as user.* are restricted for kernfs-based
  instances to a fairly limited number.

  As there are apparently users that have a fairly large number of
  xattrs we should scale a bit better. Using a simple linked list
  protected by a spinlock used for set, get, and list operations doesn't
  scale well if users use a lot of xattrs even if it's not a crazy
  number.

  Let's switch to a simple rbtree protected by a rwlock. It scales way
  better and gets rid of the perf issues some people reported. We
  originally had fancier solutions even using an rcu+seqlock protected
  rbtree but we had concerns about being to clever and also that
  deletion from an rbtree with rcu+seqlock isn't entirely safe.

  The rbtree plus rwlock is perfectly fine. By far the most common
  operation is getting an xattr. While setting an xattr is not and
  should be comparatively rare. And listxattr() often only happens when
  copying xattrs between files or together with the contents to a new
  file.

  Holding a lock across listxattr() is unproblematic because it doesn't
  list the values of xattrs. It can only be used to list the names of
  all xattrs set on a file. And the number of xattr names that can be
  listed with listxattr() is limited to XATTR_LIST_MAX aka 65536 bytes.
  If a larger buffer is passed then vfs_listxattr() caps it to
  XATTR_LIST_MAX and if more xattr names are found it will return
  -E2BIG. In short, the maximum amount of memory that can be retrieved
  via listxattr() is limited and thus listxattr() bounded.

  Of course, the API is broken as documented on xattr(7) already. While
  I have no idea how the xattr api ended up in this state we should
  probably try to come up with something here at some point. An iterator
  pattern similar to readdir() as an alternative to listxattr() or
  something else.

  Right now it is extremly strange that users can set millions of xattrs
  but then can't use listxattr() to know which xattrs are actually set.
  And it's really trivial to do:

	for i in {1..1000000}; do setfattr -n security.$i -v $i ./file1; done

  And around 5000 xattrs it's impossible to use listxattr() to figure
  out which xattrs are actually set. So I have suggested that we try to
  limit the number of xattrs for simple xattrs at least. But that's a
  future patch and I don't consider it very urgent.

  A bonus of this port to rbtree+rwlock is that we shrink the memory
  consumption for users of the simple xattr infrastructure.

  This also adds kernel documentation to all the functions"

* tag 'fs.xattr.simple.rework.rbtree.rwlock.v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping:
  xattr: use rbtree for simple_xattrs
 2022-12-13 10:08:36 -08:00
Linus Torvalds
deb9acc122 A large number of cleanups and bug fixes, with many of the bug fixes 
found by Syzbot and fuzzing.  (Many of the bug fixes involve less-used
 ext4 features such as fast_commit, inline_data and bigalloc.)
 
 In addition, remove the writepage function for ext4, since the
 medium-term plan is to remove ->writepage() entirely.  (The VM doesn't
 need or want writepage() for writeback, since it is fine with
 ->writepages() so long as ->migrate_folio() is implemented.)
 -----BEGIN PGP SIGNATURE-----
 
 iQEzBAABCAAdFiEEK2m5VNv+CHkogTfJ8vlZVpUNgaMFAmOWqrMACgkQ8vlZVpUN
 gaMvmgf+P2C6vzjn13ZdF+GwFTi4fx4TJ5BZT78LQqvTZqhkfk4k1q2SFfHI7nXT
 ZWdu1KUQ0SYLo64oaSU9W+2B2pmGi/KgUlrwNhy8DFeGStogPuDVfmGWB63p1UQL
 ld42mE9q7bjY6nCZSKYXPp2jfSwsHuliHBJ4UfzVNAIwjiUEJ7pGeIrMFdLAEkVm
 TVNzvlUZaHUnVxhpsP6hs+5WNhHQ2IhWz4rwX01ussNgHTijYac4iaL05wpTvF5e
 6NtvfmpOEMAbYrmIkJX4RVss4JNsHNOC0E8fjEHlgXJxBiAI6w8GxTxrS52Y4ELH
 nHXl/pc0L+I8+yh9B9+s0LBaSuPuTg==
 =lezv
 -----END PGP SIGNATURE-----

Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 updates from Ted Ts'o:
 "A large number of cleanups and bug fixes, with many of the bug fixes
  found by Syzbot and fuzzing. (Many of the bug fixes involve less-used
  ext4 features such as fast_commit, inline_data and bigalloc)

  In addition, remove the writepage function for ext4, since the
  medium-term plan is to remove ->writepage() entirely. (The VM doesn't
  need or want writepage() for writeback, since it is fine with
  ->writepages() so long as ->migrate_folio() is implemented)"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (58 commits)
  ext4: fix reserved cluster accounting in __es_remove_extent()
  ext4: fix inode leak in ext4_xattr_inode_create() on an error path
  ext4: allocate extended attribute value in vmalloc area
  ext4: avoid unaccounted block allocation when expanding inode
  ext4: initialize quota before expanding inode in setproject ioctl
  ext4: stop providing .writepage hook
  mm: export buffer_migrate_folio_norefs()
  ext4: switch to using write_cache_pages() for data=journal writeout
  jbd2: switch jbd2_submit_inode_data() to use fs-provided hook for data writeout
  ext4: switch to using ext4_do_writepages() for ordered data writeout
  ext4: move percpu_rwsem protection into ext4_writepages()
  ext4: provide ext4_do_writepages()
  ext4: add support for writepages calls that cannot map blocks
  ext4: drop pointless IO submission from ext4_bio_write_page()
  ext4: remove nr_submitted from ext4_bio_write_page()
  ext4: move keep_towrite handling to ext4_bio_write_page()
  ext4: handle redirtying in ext4_bio_write_page()
  ext4: fix kernel BUG in 'ext4_write_inline_data_end()'
  ext4: make ext4_mb_initialize_context return void
  ext4: fix deadlock due to mbcache entry corruption
  ...
 2022-12-12 19:56:37 -08:00
Linus Torvalds
6a518afcc2 fs.acl.rework.v6.2 
-----BEGIN PGP SIGNATURE-----
 
 iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCY5bwTgAKCRCRxhvAZXjc
 ovd2AQCK00NAtGjQCjQPQGyTa4GAPqvWgq1ef0lnhv+TL5US5gD9FncQ8UofeMXt
 pBfjtAD6ettTPCTxUQfnTwWEU4rc7Qg=
 =27Wm
 -----END PGP SIGNATURE-----

Merge tag 'fs.acl.rework.v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping

Pull VFS acl updates from Christian Brauner:
 "This contains the work that builds a dedicated vfs posix acl api.

  The origins of this work trace back to v5.19 but it took quite a while
  to understand the various filesystem specific implementations in
  sufficient detail and also come up with an acceptable solution.

  As we discussed and seen multiple times the current state of how posix
  acls are handled isn't nice and comes with a lot of problems: The
  current way of handling posix acls via the generic xattr api is error
  prone, hard to maintain, and type unsafe for the vfs until we call
  into the filesystem's dedicated get and set inode operations.

  It is already the case that posix acls are special-cased to death all
  the way through the vfs. There are an uncounted number of hacks that
  operate on the uapi posix acl struct instead of the dedicated vfs
  struct posix_acl. And the vfs must be involved in order to interpret
  and fixup posix acls before storing them to the backing store, caching
  them, reporting them to userspace, or for permission checking.

  Currently a range of hacks and duct tape exist to make this work. As
  with most things this is really no ones fault it's just something that
  happened over time. But the code is hard to understand and difficult
  to maintain and one is constantly at risk of introducing bugs and
  regressions when having to touch it.

  Instead of continuing to hack posix acls through the xattr handlers
  this series builds a dedicated posix acl api solely around the get and
  set inode operations.

  Going forward, the vfs_get_acl(), vfs_remove_acl(), and vfs_set_acl()
  helpers must be used in order to interact with posix acls. They
  operate directly on the vfs internal struct posix_acl instead of
  abusing the uapi posix acl struct as we currently do. In the end this
  removes all of the hackiness, makes the codepaths easier to maintain,
  and gets us type safety.

  This series passes the LTP and xfstests suites without any
  regressions. For xfstests the following combinations were tested:
   - xfs
   - ext4
   - btrfs
   - overlayfs
   - overlayfs on top of idmapped mounts
   - orangefs
   - (limited) cifs

  There's more simplifications for posix acls that we can make in the
  future if the basic api has made it.

  A few implementation details:

   - The series makes sure to retain exactly the same security and
     integrity module permission checks. Especially for the integrity
     modules this api is a win because right now they convert the uapi
     posix acl struct passed to them via a void pointer into the vfs
     struct posix_acl format to perform permission checking on the mode.

     There's a new dedicated security hook for setting posix acls which
     passes the vfs struct posix_acl not a void pointer. Basing checking
     on the posix acl stored in the uapi format is really unreliable.
     The vfs currently hacks around directly in the uapi struct storing
     values that frankly the security and integrity modules can't
     correctly interpret as evidenced by bugs we reported and fixed in
     this area. It's not necessarily even their fault it's just that the
     format we provide to them is sub optimal.

   - Some filesystems like 9p and cifs need access to the dentry in
     order to get and set posix acls which is why they either only
     partially or not even at all implement get and set inode
     operations. For example, cifs allows setxattr() and getxattr()
     operations but doesn't allow permission checking based on posix
     acls because it can't implement a get acl inode operation.

     Thus, this patch series updates the set acl inode operation to take
     a dentry instead of an inode argument. However, for the get acl
     inode operation we can't do this as the old get acl method is
     called in e.g., generic_permission() and inode_permission(). These
     helpers in turn are called in various filesystem's permission inode
     operation. So passing a dentry argument to the old get acl inode
     operation would amount to passing a dentry to the permission inode
     operation which we shouldn't and probably can't do.

     So instead of extending the existing inode operation Christoph
     suggested to add a new one. He also requested to ensure that the
     get and set acl inode operation taking a dentry are consistently
     named. So for this version the old get acl operation is renamed to
     ->get_inode_acl() and a new ->get_acl() inode operation taking a
     dentry is added. With this we can give both 9p and cifs get and set
     acl inode operations and in turn remove their complex custom posix
     xattr handlers.

     In the future I hope to get rid of the inode method duplication but
     it isn't like we have never had this situation. Readdir is just one
     example. And frankly, the overall gain in type safety and the more
     pleasant api wise are simply too big of a benefit to not accept
     this duplication for a while.

   - We've done a full audit of every codepaths using variant of the
     current generic xattr api to get and set posix acls and
     surprisingly it isn't that many places. There's of course always a
     chance that we might have missed some and if so I'm sure we'll find
     them soon enough.

     The crucial codepaths to be converted are obviously stacking
     filesystems such as ecryptfs and overlayfs.

     For a list of all callers currently using generic xattr api helpers
     see [2] including comments whether they support posix acls or not.

   - The old vfs generic posix acl infrastructure doesn't obey the
     create and replace semantics promised on the setxattr(2) manpage.
     This patch series doesn't address this. It really is something we
     should revisit later though.

  The patches are roughly organized as follows:

   (1) Change existing set acl inode operation to take a dentry
       argument (Intended to be a non-functional change)

   (2) Rename existing get acl method (Intended to be a non-functional
       change)

   (3) Implement get and set acl inode operations for filesystems that
       couldn't implement one before because of the missing dentry.
       That's mostly 9p and cifs (Intended to be a non-functional
       change)

   (4) Build posix acl api, i.e., add vfs_get_acl(), vfs_remove_acl(),
       and vfs_set_acl() including security and integrity hooks
       (Intended to be a non-functional change)

   (5) Implement get and set acl inode operations for stacking
       filesystems (Intended to be a non-functional change)

   (6) Switch posix acl handling in stacking filesystems to new posix
       acl api now that all filesystems it can stack upon support it.

   (7) Switch vfs to new posix acl api (semantical change)

   (8) Remove all now unused helpers

   (9) Additional regression fixes reported after we merged this into
       linux-next

  Thanks to Seth for a lot of good discussion around this and
  encouragement and input from Christoph"

* tag 'fs.acl.rework.v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping: (36 commits)
  posix_acl: Fix the type of sentinel in get_acl
  orangefs: fix mode handling
  ovl: call posix_acl_release() after error checking
  evm: remove dead code in evm_inode_set_acl()
  cifs: check whether acl is valid early
  acl: make vfs_posix_acl_to_xattr() static
  acl: remove a slew of now unused helpers
  9p: use stub posix acl handlers
  cifs: use stub posix acl handlers
  ovl: use stub posix acl handlers
  ecryptfs: use stub posix acl handlers
  evm: remove evm_xattr_acl_change()
  xattr: use posix acl api
  ovl: use posix acl api
  ovl: implement set acl method
  ovl: implement get acl method
  ecryptfs: implement set acl method
  ecryptfs: implement get acl method
  ksmbd: use vfs_remove_acl()
  acl: add vfs_remove_acl()
  ...
 2022-12-12 18:46:39 -08:00
Linus Torvalds
75f4d9af8b iov_iter work; most of that is about getting rid of 
direction misannotations and (hopefully) preventing
 more of the same for the future.
 
 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
 -----BEGIN PGP SIGNATURE-----
 
 iHQEABYIAB0WIQQqUNBr3gm4hGXdBJlZ7Krx/gZQ6wUCY5ZzQAAKCRBZ7Krx/gZQ
 65RZAP4nTkvOn0NZLVFkuGOx8pgJelXAvrteyAuecVL8V6CR4AD40qCVY51PJp8N
 MzwiRTeqnGDxTTF7mgd//IB6hoatAA==
 =bcvF
 -----END PGP SIGNATURE-----

Merge tag 'pull-iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull iov_iter updates from Al Viro:
 "iov_iter work; most of that is about getting rid of direction
  misannotations and (hopefully) preventing more of the same for the
  future"

* tag 'pull-iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  use less confusing names for iov_iter direction initializers
  iov_iter: saner checks for attempt to copy to/from iterator
  [xen] fix "direction" argument of iov_iter_kvec()
  [vhost] fix 'direction' argument of iov_iter_{init,bvec}()
  [target] fix iov_iter_bvec() "direction" argument
  [s390] memcpy_real(): WRITE is "data source", not destination...
  [s390] zcore: WRITE is "data source", not destination...
  [infiniband] READ is "data destination", not source...
  [fsi] WRITE is "data source", not destination...
  [s390] copy_oldmem_kernel() - WRITE is "data source", not destination
  csum_and_copy_to_iter(): handle ITER_DISCARD
  get rid of unlikely() on page_copy_sane() calls
 2022-12-12 18:29:54 -08:00
Sidhartha Kumar
c45bc55a99 mm/hugetlb: set head flag before setting compound_order in __prep_compound_gigantic_folio 
folio_set_compound_order() checks if the passed in folio is a large folio.
A large folio is indicated by the PG_head flag.  Call __folio_set_head()
before setting the order.

Link: https://lkml.kernel.org/r/20221212225529.22493-1-sidhartha.kumar@oracle.com
Fixes: d1c6095572 ("mm/hugetlb: convert hugetlb prep functions to folios")
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reported-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-12 16:47:11 -08:00
Linus Torvalds
e2ed78d5d9 linux-kselftest-kunit-next-6.2-rc1 
This KUnit next update for Linux 6.2-rc1 consists of several enhancements,
 fixes, clean-ups, documentation updates, improvements to logging and KTAP
 compliance of KUnit test output:
 
 - log numbers in decimal and hex
 - parse KTAP compliant test output
 - allow conditionally exposing static symbols to tests
   when KUNIT is enabled
 - make static symbols visible during kunit testing
 - clean-ups to remove unused structure definition
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEPZKym/RZuOCGeA/kCwJExA0NQxwFAmOXnPYACgkQCwJExA0N
 Qxwf9RAAwdBKxgPZuKZ40v69Jm8YhaO3vyKUkyYRH59/HQGFUHMA2f2ONez4krEX
 iXPgBFQ+7pB63FdgQi2HSg2z/u3xY02AaGgZGXDuNJDmg2xYjNDfZ0GjN6tuavlN
 Liz01DGZkjZoVVXM6oV2xT8woBg/0BbdkKNL1OBO9RBZFHzwDryRzfXmQb8cKlNr
 S+tkeZTlCA/s7UW2LNj4VlTzn6wgni4Y9gSk4wbQmSGWn3OX3rHaqAb7GiZ/yPGb
 1WjbMeE8FwyydLU40aOZZ8V6AJRiw5VGPJyFzWJyWZ21xOgN9Z95b+I36z8RXraA
 i/wnazO/FJsrhzvKL83rQkrSW6bpmVY+jGvk+L6deFM6Ro/vEWHJ4DgyKsIdMiJy
 gUM1Q69szptq+ZRHGrZWPlVONBkBXMOL+fePbCbGcMzlaEAS/zsFYW9IBKcvLzwP
 uHzzMS/cMmSUq52ZIyl9jhHQFVSoErCpJwQjAaZBQpYXPmE7yLcZItxnCaSUQTay
 bRwyps5ph5md0oJTTFJKZ4Zx5FJ2ItjbC4y9BIexb9gYRDdRq723ivDoVENZl/Zk
 DFIV95AY+mSxadS5vFagwWwX0ZN0KFKxeM8Tw7VTimal/0Sbglqp+oflsuKFD6JQ
 b5HUixYifKMbWxkH5xrUb8NdjmBj561TYa8U4N+j3oOiaPYu5Ss=
 =UQNn
 -----END PGP SIGNATURE-----

Merge tag 'linux-kselftest-kunit-next-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull KUnit updates from Shuah Khan:
 "Several enhancements, fixes, clean-ups, documentation updates,
  improvements to logging and KTAP compliance of KUnit test output:

   - log numbers in decimal and hex

   - parse KTAP compliant test output

   - allow conditionally exposing static symbols to tests when KUNIT is
     enabled

   - make static symbols visible during kunit testing

   - clean-ups to remove unused structure definition"

* tag 'linux-kselftest-kunit-next-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (29 commits)
  Documentation: dev-tools: Clarify requirements for result description
  apparmor: test: make static symbols visible during kunit testing
  kunit: add macro to allow conditionally exposing static symbols to tests
  kunit: tool: make parser preserve whitespace when printing test log
  Documentation: kunit: Fix "How Do I Use This" / "Next Steps" sections
  kunit: tool: don't include KTAP headers and the like in the test log
  kunit: improve KTAP compliance of KUnit test output
  kunit: tool: parse KTAP compliant test output
  mm: slub: test: Use the kunit_get_current_test() function
  kunit: Use the static key when retrieving the current test
  kunit: Provide a static key to check if KUnit is actively running tests
  kunit: tool: make --json do nothing if --raw_ouput is set
  kunit: tool: tweak error message when no KTAP found
  kunit: remove KUNIT_INIT_MEM_ASSERTION macro
  Documentation: kunit: Remove redundant 'tips.rst' page
  Documentation: KUnit: reword description of assertions
  Documentation: KUnit: make usage.rst a superset of tips.rst, remove duplication
  kunit: eliminate KUNIT_INIT_*_ASSERT_STRUCT macros
  kunit: tool: remove redundant file.close() call in unit test
  kunit: tool: unit tests all check parser errors, standardize formatting a bit
  ...
 2022-12-12 16:42:57 -08:00
Linus Torvalds
268325bda5 Random number generator updates for Linux 6.2-rc1. 
-----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEq5lC5tSkz8NBJiCnSfxwEqXeA64FAmOU+U8ACgkQSfxwEqXe
 A67NnQ//Y5DltmvibyPd7r1TFT2gUYv+Rx3sUV9ZE1NYptd/SWhhcL8c5FZ70Fuw
 bSKCa1uiWjOxosjXT1kGrWq3de7q7oUpAPSOGxgxzoaNURIt58N/ajItCX/4Au8I
 RlGAScHy5e5t41/26a498kB6qJ441fBEqCYKQpPLINMBAhe8TQ+NVp0rlpUwNHFX
 WrUGg4oKWxdBIW3HkDirQjJWDkkAiklRTifQh/Al4b6QDbOnRUGGCeckNOhixsvS
 waHWTld+Td8jRrA4b82tUb2uVZ2/b8dEvj/A8CuTv4yC0lywoyMgBWmJAGOC+UmT
 ZVNdGW02Jc2T+Iap8ZdsEmeLHNqbli4+IcbY5xNlov+tHJ2oz41H9TZoYKbudlr6
 /ReAUPSn7i50PhbQlEruj3eg+M2gjOeh8OF8UKwwRK8PghvyWQ1ScW0l3kUhPIhI
 PdIG6j4+D2mJc1FIj2rTVB+Bg933x6S+qx4zDxGlNp62AARUFYf6EgyD6aXFQVuX
 RxcKb6cjRuFkzFiKc8zkqg5edZH+IJcPNuIBmABqTGBOxbZWURXzIQvK/iULqZa4
 CdGAFIs6FuOh8pFHLI3R4YoHBopbHup/xKDEeAO9KZGyeVIuOSERDxxo5f/ITzcq
 APvT77DFOEuyvanr8RMqqh0yUjzcddXqw9+ieufsAyDwjD9DTuE=
 =QRhK
 -----END PGP SIGNATURE-----

Merge tag 'random-6.2-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random

Pull random number generator updates from Jason Donenfeld:

 - Replace prandom_u32_max() and various open-coded variants of it,
   there is now a new family of functions that uses fast rejection
   sampling to choose properly uniformly random numbers within an
   interval:

       get_random_u32_below(ceil) - [0, ceil)
       get_random_u32_above(floor) - (floor, U32_MAX]
       get_random_u32_inclusive(floor, ceil) - [floor, ceil]

   Coccinelle was used to convert all current users of
   prandom_u32_max(), as well as many open-coded patterns, resulting in
   improvements throughout the tree.

   I'll have a "late" 6.1-rc1 pull for you that removes the now unused
   prandom_u32_max() function, just in case any other trees add a new
   use case of it that needs to converted. According to linux-next,
   there may be two trivial cases of prandom_u32_max() reintroductions
   that are fixable with a 's/.../.../'. So I'll have for you a final
   conversion patch doing that alongside the removal patch during the
   second week.

   This is a treewide change that touches many files throughout.

 - More consistent use of get_random_canary().

 - Updates to comments, documentation, tests, headers, and
   simplification in configuration.

 - The arch_get_random*_early() abstraction was only used by arm64 and
   wasn't entirely useful, so this has been replaced by code that works
   in all relevant contexts.

 - The kernel will use and manage random seeds in non-volatile EFI
   variables, refreshing a variable with a fresh seed when the RNG is
   initialized. The RNG GUID namespace is then hidden from efivarfs to
   prevent accidental leakage.

   These changes are split into random.c infrastructure code used in the
   EFI subsystem, in this pull request, and related support inside of
   EFISTUB, in Ard's EFI tree. These are co-dependent for full
   functionality, but the order of merging doesn't matter.

 - Part of the infrastructure added for the EFI support is also used for
   an improvement to the way vsprintf initializes its siphash key,
   replacing an sleep loop wart.

 - The hardware RNG framework now always calls its correct random.c
   input function, add_hwgenerator_randomness(), rather than sometimes
   going through helpers better suited for other cases.

 - The add_latent_entropy() function has long been called from the fork
   handler, but is a no-op when the latent entropy gcc plugin isn't
   used, which is fine for the purposes of latent entropy.

   But it was missing out on the cycle counter that was also being mixed
   in beside the latent entropy variable. So now, if the latent entropy
   gcc plugin isn't enabled, add_latent_entropy() will expand to a call
   to add_device_randomness(NULL, 0), which adds a cycle counter,
   without the absent latent entropy variable.

 - The RNG is now reseeded from a delayed worker, rather than on demand
   when used. Always running from a worker allows it to make use of the
   CPU RNG on platforms like S390x, whose instructions are too slow to
   do so from interrupts. It also has the effect of adding in new inputs
   more frequently with more regularity, amounting to a long term
   transcript of random values. Plus, it helps a bit with the upcoming
   vDSO implementation (which isn't yet ready for 6.2).

 - The jitter entropy algorithm now tries to execute on many different
   CPUs, round-robining, in hopes of hitting even more memory latencies
   and other unpredictable effects. It also will mix in a cycle counter
   when the entropy timer fires, in addition to being mixed in from the
   main loop, to account more explicitly for fluctuations in that timer
   firing. And the state it touches is now kept within the same cache
   line, so that it's assured that the different execution contexts will
   cause latencies.

* tag 'random-6.2-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random: (23 commits)
  random: include <linux/once.h> in the right header
  random: align entropy_timer_state to cache line
  random: mix in cycle counter when jitter timer fires
  random: spread out jitter callback to different CPUs
  random: remove extraneous period and add a missing one in comments
  efi: random: refresh non-volatile random seed when RNG is initialized
  vsprintf: initialize siphash key using notifier
  random: add back async readiness notifier
  random: reseed in delayed work rather than on-demand
  random: always mix cycle counter in add_latent_entropy()
  hw_random: use add_hwgenerator_randomness() for early entropy
  random: modernize documentation comment on get_random_bytes()
  random: adjust comment to account for removed function
  random: remove early archrandom abstraction
  random: use random.trust_{bootloader,cpu} command line option only
  stackprotector: actually use get_random_canary()
  stackprotector: move get_random_canary() into stackprotector.h
  treewide: use get_random_u32_inclusive() when possible
  treewide: use get_random_u32_{above,below}() instead of manual loop
  treewide: use get_random_u32_below() instead of deprecated function
  ...
 2022-12-12 16:22:22 -08:00
Linus Torvalds
ca1443c7e7 Merge branch 'for-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu 
Pull percpu updates from Dennis Zhou:
 "Baoquan was nice enough to run some clean ups for percpu"

* 'for-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  mm/percpu: remove unused PERCPU_DYNAMIC_EARLY_SLOTS
  mm/percpu.c: remove the lcm code since block size is fixed at page size
  mm/percpu: replace the goto with break
  mm/percpu: add comment to state the empty populated pages accounting
  mm/percpu: Update the code comment when creating new chunk
  mm/percpu: use list_first_entry_or_null in pcpu_reclaim_populated()
  mm/percpu: remove unused pcpu_map_extend_chunks
 2022-12-12 16:07:04 -08:00
David Gow
909c6475d5 mm: slub: test: Use the kunit_get_current_test() function 
Use the newly-added function kunit_get_current_test() instead of
accessing current->kunit_test directly. This function uses a static key
to return more quickly when KUnit is enabled, but no tests are actively
running. There should therefore be a negligible performance impact to
enabling the slub KUnit tests.

Other than the performance improvement, this should be a no-op.

Cc: Oliver Glitta <glittao@gmail.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Gow <davidgow@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
 2022-12-12 14:13:47 -07:00
Linus Torvalds
7d62159919 hyperv-next for v6.2 
-----BEGIN PGP SIGNATURE-----
 
 iQFHBAABCAAxFiEEIbPD0id6easf0xsudhRwX5BBoF4FAmORzR4THHdlaS5saXVA
 a2VybmVsLm9yZwAKCRB2FHBfkEGgXkqCCACFwHz04iepLE7R8ZZ6BVUhD6uzfzDo
 s1j7ozOUGUe3vI6q0DElHWVQZgzIzLypVsfWkZToe6jeOU6R48b0tZSFyJCUNwGM
 ogmS7N8fBdHfY9SBFoUPoziBifXpf3kq4hhX/w+1Lge9CN5Ywc4KjuJb91EAInbs
 lm47O4KQY8w8A7BbPBHYBueUVWLvgwPRPOS032zqxN1787m2tCxpqkfnImK39kh6
 IsBBIZfYsok0H5wldhZXnsARpEOeFF6BoFBXpFPlmnbv2VcK2AfZgTYdA3ESyEgd
 NyOFDfh6BO07gTR1xCH6gvOpkHwx6xKAkjE36RymdhXS6fhRCRsfahVB
 =m78g
 -----END PGP SIGNATURE-----

Merge tag 'hyperv-next-signed-20221208' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull hyperv updates from Wei Liu:

 - Drop unregister syscore from hyperv_cleanup to avoid hang (Gaurav
   Kohli)

 - Clean up panic path for Hyper-V framebuffer (Guilherme G. Piccoli)

 - Allow IRQ remapping to work without x2apic (Nuno Das Neves)

 - Fix comments (Olaf Hering)

 - Expand hv_vp_assist_page definition (Saurabh Sengar)

 - Improvement to page reporting (Shradha Gupta)

 - Make sure TSC clocksource works when Linux runs as the root partition
   (Stanislav Kinsburskiy)

* tag 'hyperv-next-signed-20221208' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  x86/hyperv: Remove unregister syscore call from Hyper-V cleanup
  iommu/hyper-v: Allow hyperv irq remapping without x2apic
  clocksource: hyper-v: Add TSC page support for root partition
  clocksource: hyper-v: Use TSC PFN getter to map vvar page
  clocksource: hyper-v: Introduce TSC PFN getter
  clocksource: hyper-v: Introduce a pointer to TSC page
  x86/hyperv: Expand definition of struct hv_vp_assist_page
  PCI: hv: update comment in x86 specific hv_arch_irq_unmask
  hv: fix comment typo in vmbus_channel/low_latency
  drivers: hv, hyperv_fb: Untangle and refactor Hyper-V panic notifiers
  video: hyperv_fb: Avoid taking busy spinlock on panic path
  hv_balloon: Add support for configurable order free page reporting
  mm/page_reporting: Add checks for page_reporting_order param
 2022-12-12 09:34:16 -08:00
Linus Torvalds
893660b0e1 slab updates for 6.2-rc1 
-----BEGIN PGP SIGNATURE-----
 
 iQEzBAABCAAdFiEEjUuTAak14xi+SF7M4CHKc/GJqRAFAmOTQvYACgkQ4CHKc/GJ
 qRCaqQf/UjCDmj1vYKcsTzp5L4MDXdQPA7dKtytbnZtROtClVNUzB0jODsfeMI7C
 SwbDJRoUU1y99GRFYIx9oGji1q7TYOWS/PsZxOGkv8ILommmQ1kJdZdxt9rOqYNg
 3mjCZoQmZMIRipLDrN55C096Mi+mI89kkE4Lkyrigpmxvc0KyX6QBerr+VmaBMHw
 DjmFC6Gj+ZH2AX6z7AzOF1gZ42gPBQUjWdHFRcY41dShOQZNl2FPT5ITAvotlJlH
 9mj6woCqW936UOcpUl+Qqk7mekDJb1hqmYXV2VAlhprBi6Vcd9PU6GmPPb6w51bS
 HkSNNYjkbuNxBXY13PUPcR0hEHv9zw==
 =AlWx
 -----END PGP SIGNATURE-----

Merge tag 'slab-for-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

Pull slab updates from Vlastimil Babka:

 - SLOB deprecation and SLUB_TINY

   The SLOB allocator adds maintenance burden and stands in the way of
   API improvements [1]. Deprecate it by renaming the config option (to
   make users notice) to CONFIG_SLOB_DEPRECATED with updated help text.
   SLUB should be used instead as SLAB will be the next on the removal
   list.

   Based on reports from a riscv k210 board with 8MB RAM, add a
   CONFIG_SLUB_TINY option to minimize SLUB's memory usage at the
   expense of scalability. This has resolved the k210 regression [2] so
   in case there are no others (that wouldn't be resolvable by further
   tweaks to SLUB_TINY) plan is to remove SLOB in a few cycles.

   Existing defconfigs with CONFIG_SLOB are converted to
   CONFIG_SLUB_TINY.

 - kmalloc() slub_debug redzone improvements

   A series from Feng Tang that builds on the tracking or requested size
   for kmalloc() allocations (for caches with debugging enabled) added
   in 6.1, to make redzone checks consider the requested size and not
   the rounded up one, in order to catch more subtle buffer overruns.
   Includes new slub_kunit test.

 - struct slab fields reordering to accomodate larger rcu_head

   RCU folks would like to grow rcu_head with debugging options, which
   breaks current struct slab layout's assumptions, so reorganize it to
   make this possible.

 - Miscellaneous improvements/fixes:
     - __alloc_size checking compiler workaround (Kees Cook)
     - Optimize and cleanup SLUB's sysfs init (Rasmus Villemoes)
     - Make SLAB compatible with PROVE_RAW_LOCK_NESTING (Jiri Kosina)
     - Correct SLUB's percpu allocation estimates (Baoquan He)
     - Re-enableS LUB's run-time failslab sysfs control (Alexander Atanasov)
     - Make tools/vm/slabinfo more user friendly when not run as root (Rong Tao)
     - Dead code removal in SLUB (Hyeonggon Yoo)

* tag 'slab-for-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab: (31 commits)
  mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED
  mm, slub: don't aggressively inline with CONFIG_SLUB_TINY
  mm, slub: remove percpu slabs with CONFIG_SLUB_TINY
  mm, slub: split out allocations from pre/post hooks
  mm/slub, kunit: Add a test case for kmalloc redzone check
  mm/slub, kunit: add SLAB_SKIP_KFENCE flag for cache creation
  mm, slub: refactor free debug processing
  mm, slab: ignore SLAB_RECLAIM_ACCOUNT with CONFIG_SLUB_TINY
  mm, slub: don't create kmalloc-rcl caches with CONFIG_SLUB_TINY
  mm, slub: lower the default slub_max_order with CONFIG_SLUB_TINY
  mm, slub: retain no free slabs on partial list with CONFIG_SLUB_TINY
  mm, slub: disable SYSFS support with CONFIG_SLUB_TINY
  mm, slub: add CONFIG_SLUB_TINY
  mm, slab: ignore hardened usercopy parameters when disabled
  slab: Remove special-casing of const 0 size allocations
  slab: Clean up SLOB vs kmalloc() definition
  mm/sl[au]b: rearrange struct slab fields to allow larger rcu_head
  mm/migrate: make isolate_movable_page() skip slab pages
  mm/slab: move and adjust kernel-doc for kmem_cache_alloc
  mm/slub, percpu: correct the calculation of early percpu allocation size
  ...
 2022-12-12 09:13:06 -08:00
Linus Torvalds
c47454823b mm: mmu_gather: allow more than one batch of delayed rmaps 
Commit 5df397dec7 ("mm: delay page_remove_rmap() until after the TLB has
been flushed") limited the page batching for the mmu gather operation when
a dirty shared page needed to delay rmap removal until after the TLB had
been flushed.

It did so because it needs to walk that array of pages while still holding
the page table lock, and our mmu_gather infrastructure allows for batching
quite a lot of pages.  We may have thousands on pages queued up for
freeing, and we wanted to walk only the last batch if we then added a
dirty page to the queue.

However, when I limited it to one batch, I didn't think of the degenerate
case of the special first batch that is embedded on-stack in the
mmu_gather structure (called "local") and that only has eight entries.

So with the right pattern, that "limit delayed rmap to just one batch"
will trigger over and over in that first small batch, and we'll waste a
lot of time flushing TLB's every eight pages.

And those right patterns are trivially triggered by just having a shared
mappings with lots of adjacent dirty pages.  Like the 'page_fault3'
subtest of the 'will-it-scale' benchmark, that just maps a shared area,
dirties all pages, and unmaps it.  Rinse and repeat.

We still want to limit the batching, but to fix this (easily triggered)
degenerate case, just expand the "only one batch" logic to instead be
"only one batch that isn't the special first on-stack ('local') batch".

That way, when we need to flush the delayed rmaps, we can still limit our
walk to just the last batch - and that first small one.

Link: https://lkml.kernel.org/r/CAHk-=whkL5aM1fR7kYUmhHQHBcMUc-bDoFP7EwYjTxy64DGtvw@mail.gmail.com
Fixes: 5df397dec7 ("mm: delay page_remove_rmap() until after the TLB has been flushed")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: kernel test robot <yujie.liu@intel.com>
  Link: https://lore.kernel.org/oe-lkp/202212051534.852804af-yujie.liu@intel.com
Tested-by: Huang, Ying <ying.huang@intel.com>
Tested-by: Hugh Dickins <hughd@google.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: "Yin, Fengwei" <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:21 -08:00
Alexander Potapenko
5478afc55a kmsan: fix memcpy tests 
Recent Clang changes may cause it to delete calls of memcpy(), if the
source is an uninitialized volatile local.  This happens because passing a
pointer to a volatile local into memcpy() discards the volatile qualifier,
giving the compiler a free hand to optimize the memcpy() call away.

Use OPTIMIZER_HIDE_VAR() to hide the uninitialized var from the too-smart
compiler.

Link: https://lkml.kernel.org/r/20221205145740.694038-1-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:21 -08:00
Kefeng Wang
de2e517143 mm: add cond_resched() in swapin_walk_pmd_entry() 
When handling MADV_WILLNEED in madvise(), a soflockup may occurr in
swapin_walk_pmd_entry() if swapping in lots of memory on a slow device. 
Add a cond_resched() to avoid the possible softlockup.

Link: https://lkml.kernel.org/r/20221205140327.72304-1-wangkefeng.wang@huawei.com
Fixes: 1998cc0489 ("mm: make madvise(MADV_WILLNEED) support swap file prefetch")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Shaohua Li <shli@fusionio.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:21 -08:00
David Hildenbrand
a0ac9b3598 mm/gup_test: fix PIN_LONGTERM_TEST_READ with highmem 
Patch series "selftests/vm: fix some tests on 32bit".

I finally had the time to run some of the selftests written by me
(especially "cow") on x86 PAE.  I found some unexpected "surprises" :)

With these changes, and with [1] on top of mm-unstable, the "cow" tests
and the "ksm_functional_tests" compile and pass as expected (expected
failures with hugetlb in the "cow" tests).  "madv_populate" has one
expected test failure -- x86 does not support softdirty tracking.

#1-#3 fix commits with stable commit ids.  #4 fixes a test that is not in
mm-stable yet.

A note that there are many other compile errors/warnings when compiling on
32bit and with older Linux headers ...  something for another day.

[1] https://lkml.kernel.org/r/20221205150857.167583-1-david@redhat.com


This patch (of 4):

...  we have to kmap()/kunmap(), otherwise this won't work as expected
with highmem.

Link: https://lkml.kernel.org/r/20221205193716.276024-1-david@redhat.com
Link: https://lkml.kernel.org/r/20221205193716.276024-2-david@redhat.com
Fixes: c77369b437 ("mm/gup_test: start/stop/read functionality for PIN LONGTERM test")
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>,
Cc: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:20 -08:00
Hugh Dickins
6287b7dae8 mm,thp,rmap: fix races between updates of subpages_mapcount 
Commit 4b51634cd1, introducing the COMPOUND_MAPPED bit, paid attention
to the impossibility of subpages_mapcount ever appearing negative; but did
not attend to those races in which it can momentarily appear larger than
thought possible.

These arise from how page_remove_rmap() first decrements page->_mapcount
or compound_mapcount, then, if that transition goes negative (logical 0),
decrements subpages_mapcount.  The initial decrement lets a racing
page_add_*_rmap() reincrement _mapcount or compound_mapcount immediately,
and then in rare cases its corresponding increment of subpages_mapcount
may be completed before page_remove_rmap()'s decrement.  There could even
(with increasing unlikelihood) be a series of increments intermixed with
the decrements.

In practice, checking subpages_mapcount with a temporary WARN on range,
has caught values of 0x1000000 (2*COMPOUND_MAPPED, when move_pages() was
using remove_migration_pmd()) and 0x800201 (do_huge_pmd_wp_page() using
__split_huge_pmd()): page_add_anon_rmap() racing page_remove_rmap(), as
predicted.

I certainly found it harder to reason about than when bit_spin_locked, but
the easy case gives a clue to how to handle the harder case.  The easy
case being the three !(nr & COMPOUND_MAPPED) checks, which should
obviously be replaced by (nr < COMPOUND_MAPPED) checks - to count a page
as compound mapped, even while the bit in that position is 0.

The harder case is when trying to decide how many subpages are newly
covered or uncovered, when compound map is first added or last removed:
not knowing all that racily happened between first and second atomic ops.

But the easy way to handle that, is again to count the page as compound
mapped all the while that its subpages_mapcount indicates so - ignoring
the _mapcount or compound_mapcount transition while it is on the way to
being reversed.

Link: https://lkml.kernel.org/r/4388158-3092-a960-ff2d-55f2b0fe4ef8@google.com
Fixes: 4b51634cd1 ("mm,thp,rmap: subpages_mapcount COMPOUND_MAPPED if PMD-mapped")
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: James Houghton <jthoughton@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:20 -08:00
Hugh Dickins
c449deb2b9 mm: memcg: fix swapcached stat accounting 
I'd been worried by high "swapcached" counts in memcg OOM reports, thought
we had a problem freeing swapcache, but it was just the accounting that
was wrong.

Two issues:

1.  When __remove_mapping() removes swapcache,
   __delete_from_swap_cache() relies on memcg_data for the right counts to
   be updated; but that had already been reset by mem_cgroup_swapout(). 
   Swap those calls around - mem_cgroup_swapout() does not require the
   swapcached flag to be set.

   6.1 commit ac35a49023 ("mm: multi-gen LRU: minimal
   implementation") already made a similar swap for workingset_eviction(),
   but not for this.

2.  memcg's "swapcached" count was added for memcg v2 stats, but
   displayed on OOM even for memcg v1: so mem_cgroup_move_account() ought
   to move it.

Link: https://lkml.kernel.org/r/b8b96ee0-1e1e-85f8-df97-c82a11d7cd14@google.com
Fixes: b603894248 ("mm: memcg: add swapcache stat for memcg v2")
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:20 -08:00
Mina Almasry
12a5d39552 mm: add nodes= arg to memory.reclaim 
The nodes= arg instructs the kernel to only scan the given nodes for
proactive reclaim.  For example use cases, consider a 2 tier memory
system:

nodes 0,1 -> top tier
nodes 2,3 -> second tier

$ echo "1m nodes=0" > memory.reclaim

This instructs the kernel to attempt to reclaim 1m memory from node 0. 
Since node 0 is a top tier node, demotion will be attempted first.  This
is useful to direct proactive reclaim to specific nodes that are under
pressure.

$ echo "1m nodes=2,3" > memory.reclaim

This instructs the kernel to attempt to reclaim 1m memory in the second
tier, since this tier of memory has no demotion targets the memory will be
reclaimed.

$ echo "1m nodes=0,1" > memory.reclaim

Instructs the kernel to reclaim memory from the top tier nodes, which can
be desirable according to the userspace policy if there is pressure on the
top tiers.  Since these nodes have demotion targets, the kernel will
attempt demotion first.

Since commit 3f1509c57b ("Revert "mm/vmscan: never demote for memcg
reclaim""), the proactive reclaim interface memory.reclaim does both
reclaim and demotion.  Reclaim and demotion incur different latency costs
to the jobs in the cgroup.  Demoted memory would still be addressable by
the userspace at a higher latency, but reclaimed memory would need to
incur a pagefault.

The 'nodes' arg is useful to allow the userspace to control demotion and
reclaim independently according to its policy: if the memory.reclaim is
called on a node with demotion targets, it will attempt demotion first; if
it is called on a node without demotion targets, it will only attempt
reclaim.

Link: https://lkml.kernel.org/r/20221202223533.1785418-1-almasrymina@google.com
Signed-off-by: Mina Almasry <almasrymina@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Muchun Song <songmuchun@bytedance.com>
Cc: Bagas Sanjaya <bagasdotme@gmail.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Tejun Heo <tj@kernel.org>
Cc: Wei Xu <weixugc@google.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Cc: zefan li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:19 -08:00
Mina Almasry
6b426d0714 mm: disable top-tier fallback to reclaim on proactive reclaim 
Reclaiming directly from top tier nodes breaks the aging pipeline of
memory tiers.  If we have a RAM -> CXL -> storage hierarchy, we should
demote from RAM to CXL and from CXL to storage.  If we reclaim a page from
RAM, it means we 'demote' it directly from RAM to storage, bypassing
potentially a huge amount of pages colder than it in CXL.

However disabling reclaim from top tier nodes entirely would cause ooms in
edge scenarios where lower tier memory is unreclaimable for whatever
reason, e.g.  memory being mlocked() or too hot to reclaim.  In these
cases we would rather the job run with a performance regression rather
than it oom altogether.

However, we can disable reclaim from top tier nodes for proactive reclaim.
That reclaim is not real memory pressure, and we don't have any cause to
be breaking the aging pipeline.

[akpm@linux-foundation.org: restore comment layout, per Ying Huang]
Link: https://lkml.kernel.org/r/20221201233317.1394958-1-almasrymina@google.com
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:19 -08:00
Yosry Ahmed
adb8213014 mm: memcg: fix stale protection of reclaim target memcg 
Patch series "mm: memcg: fix protection of reclaim target memcg", v3.

This series fixes a bug in calculating the protection of the reclaim
target memcg where we end up using stale effective protection values from
the last reclaim operation, instead of completely ignoring the protection
of the reclaim target as intended.  More detailed explanation and examples
in patch 1, which includes the fix.  Patches 2 & 3 introduce a selftest
case that catches the bug.


This patch (of 3):

When we are doing memcg reclaim, the intended behavior is that we
ignore any protection (memory.min, memory.low) of the target memcg (but
not its children).  Ever since the patch pointed to by the "Fixes" tag,
we actually read a stale value for the target memcg protection when
deciding whether to skip the memcg or not because it is protected.  If
the stale value happens to be high enough, we don't reclaim from the
target memcg.

Essentially, in some cases we may falsely skip reclaiming from the
target memcg of reclaim because we read a stale protection value from
last time we reclaimed from it.


During reclaim, mem_cgroup_calculate_protection() is used to determine the
effective protection (emin and elow) values of a memcg.  The protection of
the reclaim target is ignored, but we cannot set their effective
protection to 0 due to a limitation of the current implementation (see
comment in mem_cgroup_protection()).  Instead, we leave their effective
protection values unchaged, and later ignore it in
mem_cgroup_protection().

However, mem_cgroup_protection() is called later in
shrink_lruvec()->get_scan_count(), which is after the
mem_cgroup_below_{min/low}() checks in shrink_node_memcgs().  As a result,
the stale effective protection values of the target memcg may lead us to
skip reclaiming from the target memcg entirely, before calling
shrink_lruvec().  This can be even worse with recursive protection, where
the stale target memcg protection can be higher than its standalone
protection.  See two examples below (a similar version of example (a) is
added to test_memcontrol in a later patch).

(a) A simple example with proactive reclaim is as follows. Consider the
following hierarchy:
ROOT
 |
 A
 |
 B (memory.min = 10M)

Consider the following scenario:
- B has memory.current = 10M.
- The system undergoes global reclaim (or memcg reclaim in A).
- In shrink_node_memcgs():
  - mem_cgroup_calculate_protection() calculates the effective min (emin)
    of B as 10M.
  - mem_cgroup_below_min() returns true for B, we do not reclaim from B.
- Now if we want to reclaim 5M from B using proactive reclaim
  (memory.reclaim), we should be able to, as the protection of the
  target memcg should be ignored.
- In shrink_node_memcgs():
  - mem_cgroup_calculate_protection() immediately returns for B without
    doing anything, as B is the target memcg, relying on
    mem_cgroup_protection() to ignore B's stale effective min (still 10M).
  - mem_cgroup_below_min() reads the stale effective min for B and we
    skip it instead of ignoring its protection as intended, as we never
    reach mem_cgroup_protection().

(b) An more complex example with recursive protection is as follows.
Consider the following hierarchy with memory_recursiveprot:
ROOT
 |
 A (memory.min = 50M)
 |
 B (memory.min = 10M, memory.high = 40M)

Consider the following scenario:
- B has memory.current = 35M.
- The system undergoes global reclaim (target memcg is NULL).
- B will have an effective min of 50M (all of A's unclaimed protection).
- B will not be reclaimed from.
- Now allocate 10M more memory in B, pushing it above it's high limit.
- The system undergoes memcg reclaim from B (target memcg is B).
- Like example (a), we do nothing in mem_cgroup_calculate_protection(),
  then call mem_cgroup_below_min(), which will read the stale effective
  min for B (50M) and skip it. In this case, it's even worse because we
  are not just considering B's standalone protection (10M), but we are
  reading a much higher stale protection (50M) which will cause us to not
  reclaim from B at all.

This is an artifact of commit 45c7f7e1ef ("mm, memcg: decouple
e{low,min} state mutations from protection checks") which made
mem_cgroup_calculate_protection() only change the state without returning
any value.  Before that commit, we used to return MEMCG_PROT_NONE for the
target memcg, which would cause us to skip the
mem_cgroup_below_{min/low}() checks.  After that commit we do not return
anything and we end up checking the min & low effective protections for
the target memcg, which are stale.

Update mem_cgroup_supports_protection() to also check if we are reclaiming
from the target, and rename it to mem_cgroup_unprotected() (now returns
true if we should not protect the memcg, much simpler logic).

Link: https://lkml.kernel.org/r/20221202031512.1365483-1-yosryahmed@google.com
Link: https://lkml.kernel.org/r/20221202031512.1365483-2-yosryahmed@google.com
Fixes: 45c7f7e1ef ("mm, memcg: decouple e{low,min} state mutations from protection checks")
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Chris Down <chris@chrisdown.name>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vasily Averin <vasily.averin@linux.dev>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:19 -08:00
Alistair Popple
675eaca1f4 mm/mmap: properly unaccount memory on mas_preallocate() failure 
security_vm_enough_memory_mm() accounts memory via a call to
vm_acct_memory().  Therefore any subsequent failures should unaccount for
this memory prior to returning the error.

Link: https://lkml.kernel.org/r/20221202045339.2999017-1-apopple@nvidia.com
Fixes: 28c5609fb2 ("mm/mmap: preallocate maple nodes for brk vma expansion")
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:18 -08:00
Deyan Wang
ac4b2901a1 mm/page_alloc: update comments in __free_pages_ok() 
Add a comment to explain why we call get_pfnblock_migratetype() twice in
__free_pages_ok().

Link: https://lkml.kernel.org/r/20221201135045.31663-1-wonder_rock@126.com
Signed-off-by: Deyan Wang <wonder_rock@126.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:17 -08:00
Andrey Konovalov
c8c7016f50 kasan: fail non-kasan KUnit tests on KASAN reports 
After the recent changes done to KUnit-enabled KASAN tests, non-KASAN
KUnit tests stopped being failed when KASAN report is detected.

Recover that property by failing the currently running non-KASAN KUnit
test when KASAN detects and prints a report for a bad memory access.

Note that if the bad accesses happened in a kernel thread that doesn't
have a reference to the currently running KUnit-test available via
current->kunit_test, the test won't be failed.  This is a limitation of
KUnit, which doesn't yet provide a thread-agnostic way to find the
reference to the currenly running test.

Link: https://lkml.kernel.org/r/7be29a8ea967cee6b7e48d3d5a242d1d0bd96851.1669820505.git.andreyknvl@google.com
Fixes: 49d9977ac9 ("kasan: check CONFIG_KASAN_KUNIT_TEST instead of CONFIG_KUNIT")
Fixes: 7ce0ea19d5 ("kasan: switch kunit tests to console tracepoints")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: David Gow <davidgow@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:15 -08:00
Sidhartha Kumar
19fc1a7e8b mm/hugetlb: change hugetlb allocation functions to return a folio 
Many hugetlb allocation helper functions have now been converting to
folios, update their higher level callers to be compatible with folios. 
alloc_pool_huge_page is reorganized to avoid a smatch warning reporting
the folio variable is uninitialized.

[sidhartha.kumar@oracle.com: update alloc_and_dissolve_hugetlb_folio comments]
  Link: https://lkml.kernel.org/r/20221206233512.146535-1-sidhartha.kumar@oracle.com
Link: https://lkml.kernel.org/r/20221129225039.82257-11-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reported-by: Wei Chen <harperchen1110@gmail.com>
Suggested-by: John Hubbard <jhubbard@nvidia.com>
Suggested-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:15 -08:00
Sidhartha Kumar
d1c6095572 mm/hugetlb: convert hugetlb prep functions to folios 
Convert prep_new_huge_page() and __prep_compound_gigantic_page() to
folios.

Link: https://lkml.kernel.org/r/20221129225039.82257-10-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:15 -08:00
Sidhartha Kumar
7f325a8d25 mm/hugetlb: convert free_gigantic_page() to folios 
Convert callers of free_gigantic_page() to use folios, function is then
renamed to free_gigantic_folio().

Link: https://lkml.kernel.org/r/20221129225039.82257-9-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:14 -08:00
Sidhartha Kumar
240d67a86e mm/hugetlb: convert enqueue_huge_page() to folios 
Convert callers of enqueue_huge_page() to pass in a folio, function is
renamed to enqueue_hugetlb_folio().

Link: https://lkml.kernel.org/r/20221129225039.82257-8-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:14 -08:00
Sidhartha Kumar
2f6c57d696 mm/hugetlb: convert add_hugetlb_page() to folios and add hugetlb_cma_folio() 
Convert add_hugetlb_page() to take in a folio, also convert
hugetlb_cma_page() to take in a folio.

Link: https://lkml.kernel.org/r/20221129225039.82257-7-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:14 -08:00
Sidhartha Kumar
d6ef19e25d mm/hugetlb: convert update_and_free_page() to folios 
Make more progress on converting the free_huge_page() destructor to
operate on folios by converting update_and_free_page() to folios.

Link: https://lkml.kernel.org/r/20221129225039.82257-6-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>\
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:14 -08:00
Sidhartha Kumar
cfd5082b51 mm/hugetlb: convert remove_hugetlb_page() to folios 
Removes page_folio() call by converting callers to directly pass a folio
into __remove_hugetlb_page().

Link: https://lkml.kernel.org/r/20221129225039.82257-5-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:14 -08:00
Sidhartha Kumar
1a7cdab59b mm/hugetlb: convert dissolve_free_huge_page() to folios 
Removes compound_head() call by using a folio rather than a head page.

Link: https://lkml.kernel.org/r/20221129225039.82257-4-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:14 -08:00
Sidhartha Kumar
911565b828 mm/hugetlb: convert destroy_compound_gigantic_page() to folios 
Convert page operations within __destroy_compound_gigantic_page() to the
corresponding folio operations.

Link: https://lkml.kernel.org/r/20221129225039.82257-3-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tarun Sahu <tsahu@linux.ibm.com>
Cc: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-12-11 18:12:13 -08:00