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Jason Gunthorpe a11dda723c iommufd: Require drivers to supply the cache_invalidate_user ops 
If drivers don't do this then iommufd will oops invalidation ioctls with
something like:

  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
  Mem abort info:
    ESR = 0x0000000086000004
    EC = 0x21: IABT (current EL), IL = 32 bits
    SET = 0, FnV = 0
    EA = 0, S1PTW = 0
    FSC = 0x04: level 0 translation fault
  user pgtable: 4k pages, 48-bit VAs, pgdp=0000000101059000
  [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
  Internal error: Oops: 0000000086000004 [#1] PREEMPT SMP
  Modules linked in:
  CPU: 2 PID: 371 Comm: qemu-system-aar Not tainted 6.8.0-rc7-gde77230ac23a #9
  Hardware name: linux,dummy-virt (DT)
  pstate: 81400809 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=-c)
  pc : 0x0
  lr : iommufd_hwpt_invalidate+0xa4/0x204
  sp : ffff800080f3bcc0
  x29: ffff800080f3bcf0 x28: ffff0000c369b300 x27: 0000000000000000
  x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
  x23: 0000000000000000 x22: 00000000c1e334a0 x21: ffff0000c1e334a0
  x20: ffff800080f3bd38 x19: ffff800080f3bd58 x18: 0000000000000000
  x17: 0000000000000000 x16: 0000000000000000 x15: 0000ffff8240d6d8
  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
  x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000
  x8 : 0000001000000002 x7 : 0000fffeac1ec950 x6 : 0000000000000000
  x5 : ffff800080f3bd78 x4 : 0000000000000003 x3 : 0000000000000002
  x2 : 0000000000000000 x1 : ffff800080f3bcc8 x0 : ffff0000c6034d80
  Call trace:
   0x0
   iommufd_fops_ioctl+0x154/0x274
   __arm64_sys_ioctl+0xac/0xf0
   invoke_syscall+0x48/0x110
   el0_svc_common.constprop.0+0x40/0xe0
   do_el0_svc+0x1c/0x28
   el0_svc+0x34/0xb4
   el0t_64_sync_handler+0x120/0x12c
   el0t_64_sync+0x190/0x194

All existing drivers implement this op for nesting, this is mostly a
bisection aid.

Fixes: 8c6eabae38 ("iommufd: Add IOMMU_HWPT_INVALIDATE")
Link: https://lore.kernel.org/r/0-v1-e153859bd707+61-iommufd_check_ops_jgg@nvidia.com
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
History 2024-07-10 10:50:30 -03:00
arch - fix lseek in o32 compat mode 2024-06-23 07:20:02 -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 The core gains placeholders for recently added functions when CONFIG_I2C 2024-06-23 11:06:01 -04:00
drivers iommufd: Require drivers to supply the cache_invalidate_user ops 2024-07-10 10:50:30 -03:00
fs Five smb3 client fixes 2024-06-23 11:01:57 -04:00
include Merge branch 'iommufd_pri' into iommufd for-next 2024-07-09 13:55:05 -03:00
init gcc: disable '-Warray-bounds' for gcc-9 2024-06-15 10:43:04 -07:00
io_uring io_uring/rsrc: fix incorrect assignment of iter->nr_segs in io_import_fixed 2024-06-20 06:51:56 -06:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel Including fixes from wireless, bpf and netfilter. 2024-06-20 10:49:50 -07:00
lib bcachefs fixes for 6.10-rc5 2024-06-22 09:02:39 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm memblock: fix fragility in checks for unset node ID 2024-06-23 10:32:24 -04:00
net nfsd-6.10 fixes: 2024-06-22 13:55:56 -07:00
rust rust: avoid unused import warning in rusttest 2024-06-11 23:33:28 +02:00
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 lsm/stable-6.10 PR 20240617 2024-06-17 18:35:12 -07:00
sound ALSA: hda: Use imply for suggesting CONFIG_SERIAL_MULTI_INSTANTIATE 2024-06-21 12:04:19 +02:00
tools Merge branch 'iommufd_pri' into iommufd for-next 2024-07-09 13:55:05 -03:00
usr kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
virt KVM fixes for 6.10 2024-06-21 08:03:55 -04:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.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 bpf-for-netdev 2024-06-14 17:57:10 -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 ARM: 2024-06-22 07:41:57 -07:00
Makefile Linux 6.10-rc5 2024-06-23 17:08:54 -04:00
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.