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Linus Torvalds 68132b3536 VFIO fixes for v6.10-rc4 
- Fix long standing lockdep issue of using remap_pfn_range() from
    the vfio-pci fault handler for mapping device MMIO.  Commit
    ba168b52bf ("mm: use rwsem assertion macros for mmap_lock") now
    exposes this as a warning forcing this to be addressed.
 
    remap_pfn_range() was used here to efficiently map the entire vma,
    but it really never should have been used in the fault handler and
    doesn't handle concurrency, which introduced complex locking.  We
    also needed to track vmas mapping the device memory in order to zap
    those vmas when the memory is disabled resulting in a vma list.
 
    Instead of all that mess, setup an address space on the device fd
    such that we can use unmap_mapping_range() for zapping to avoid
    the tracking overhead and use the standard vmf_insert_pfn() to
    insert mappings on fault.  For now we'll iterate the vma and
    opportunistically try to insert mappings for the entire vma.  This
    aligns with typical use cases, but hopefully in the future we can
    drop the iterative approach and make use of huge_fault instead,
    once vmf_insert_pfn{pud,pmd}() learn to handle pfnmaps.
    (Alex Williamson)
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Merge tag 'vfio-v6.10-rc4' of https://github.com/awilliam/linux-vfio

Pull VFIO fixes from Alex Williamson:
 "Fix long standing lockdep issue of using remap_pfn_range() from the
  vfio-pci fault handler for mapping device MMIO. Commit ba168b52bf
  ("mm: use rwsem assertion macros for mmap_lock") now exposes this as a
  warning forcing this to be addressed.

  remap_pfn_range() was used here to efficiently map the entire vma, but
  it really never should have been used in the fault handler and doesn't
  handle concurrency, which introduced complex locking. We also needed
  to track vmas mapping the device memory in order to zap those vmas
  when the memory is disabled resulting in a vma list.

  Instead of all that mess, setup an address space on the device fd
  such that we can use unmap_mapping_range() for zapping to avoid the
  tracking overhead and use the standard vmf_insert_pfn() to insert
  mappings on fault.

  For now we'll iterate the vma and opportunistically try to insert
  mappings for the entire vma. This aligns with typical use cases, but
  hopefully in the future we can drop the iterative approach and make
  use of huge_fault instead, once vmf_insert_pfn{pud,pmd}() learn to
  handle pfnmaps"

* tag 'vfio-v6.10-rc4' of https://github.com/awilliam/linux-vfio:
  vfio/pci: Insert full vma on mmap'd MMIO fault
  vfio/pci: Use unmap_mapping_range()
  vfio: Create vfio_fs_type with inode per device
2024-06-14 18:46:53 -07:00
arch memblock: fix validation of NUMA coverage 2024-06-13 10:09:29 -07:00
block block: unmap and free user mapped integrity via submitter 2024-06-12 11:00:50 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
Documentation for-linus-2024060801 2024-06-08 10:48:11 -07:00
drivers VFIO fixes for v6.10-rc4 2024-06-14 18:46:53 -07:00
fs NFS client bugfixes for Linux 6.10 2024-06-13 11:07:32 -07:00
include VFIO fixes for v6.10-rc4 2024-06-14 18:46:53 -07:00
init Driver core changes for 6.10-rc1 2024-05-22 12:13:40 -07:00
io_uring io_uring: fix cancellation overwriting req->flags 2024-06-13 19:25:28 -06:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel Fix race between perf_event_free_task() and perf_event_release_kernel() 2024-06-08 09:26:59 -07:00
lib Including fixes from BPF and big collection of fixes for WiFi core 2024-06-06 09:55:27 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm memblock: fix validation of NUMA coverage 2024-06-13 10:09:29 -07:00
net Including fixes from bluetooth and netfilter. 2024-06-13 11:11:53 -07:00
rust LoongArch changes for v6.10 2024-05-22 09:43:07 -07:00
samples tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
scripts Kbuild fixes for v6.10 (second) 2024-06-08 10:12:33 -07:00
security tomoyo: update project links 2024-06-03 22:43:11 +09:00
sound ALSA: seq: ump: Fix swapped song position pointer data 2024-05-31 09:51:44 +02:00
tools Including fixes from bluetooth and netfilter. 2024-06-13 11:11:53 -07:00
usr kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
virt The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap Including fixes from bluetooth and netfilter. 2024-06-13 11:11:53 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS NFS client bugfixes for Linux 6.10 2024-06-13 11:07:32 -07:00
Makefile Linux 6.10-rc3 2024-06-09 14:19:43 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.