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* [PATCH v6 00/17] follow_pfn and other iomap races
@ 2020-11-19 14:41 Daniel Vetter
  2020-11-19 14:41 ` [PATCH v6 01/17] drm/exynos: Stop using frame_vector helpers Daniel Vetter
                   ` (17 more replies)
  0 siblings, 18 replies; 39+ messages in thread
From: Daniel Vetter @ 2020-11-19 14:41 UTC (permalink / raw)
  To: DRI Development, LKML
  Cc: linux-samsung-soc, kvm, Daniel Vetter, linux-mm,
	linux-arm-kernel, linux-media

Hi all

Another update of my patch series to clamp down a bunch of races and gaps
around follow_pfn and other access to iomem mmaps. Previous version:

v1: https://lore.kernel.org/dri-devel/20201007164426.1812530-1-daniel.vetter@ffwll.ch/
v2: https://lore.kernel.org/dri-devel/20201009075934.3509076-1-daniel.vetter@ffwll.ch
v3: https://lore.kernel.org/dri-devel/20201021085655.1192025-1-daniel.vetter@ffwll.ch/
v4: https://lore.kernel.org/dri-devel/20201026105818.2585306-1-daniel.vetter@ffwll.ch/
v5: https://lore.kernel.org/dri-devel/20201030100815.2269-1-daniel.vetter@ffwll.ch/

And the discussion that sparked this journey:

https://lore.kernel.org/dri-devel/20201007164426.1812530-1-daniel.vetter@ffwll.ch/

Unfortunately took way longer to update than I hoped, I got sidetracked
with a few things.

Changes in v6:
- Tested v4l userptr as Tomasz suggested. No boom observed
- Added RFC for locking down follow_pfn, per discussion with Christoph and
  Jason.
- Explain why pup_fast is safe in relevant patches, there was a bit a
  confusion when discussing v5.
- Fix up the resource patch, with CONFIG_IO_STRICT_DEVMEM it crashed on
  boot due to an unintended change (reported by John)

Changes in v5:
- Tomasz found some issues in the media patches
- Polish suggested by Christoph for the unsafe_follow_pfn patch

Changes in v4:
- Drop the s390 patch, that was very stand-alone and now queued up to land
  through s390 trees.
- Comment polish per Dan's review.

Changes in v3:
- Bunch of polish all over, no functional changes aside from one barrier
  in the resource code, for consistency.
- A few more r-b tags.

Changes in v2:
- tons of small polish&fixes all over, thanks to all the reviewers who
  spotted issues
- I managed to test at least the generic_access_phys and pci mmap revoke
  stuff with a few gdb sessions using our i915 debug tools (hence now also
  the drm/i915 patch to properly request all the pci bar regions)
- reworked approach for the pci mmap revoke: Infrastructure moved into
  kernel/resource.c, address_space mapping is now set up at open time for
  everyone (which required some sysfs changes). Does indeed look a lot
  cleaner and a lot less invasive than I feared at first.

I feel like this is ready for some wider soaking. Since the remaining bits
are all kinda connnected probably simplest if it all goes through -mm.

Cheers, Daniel

Daniel Vetter (17):
  drm/exynos: Stop using frame_vector helpers
  drm/exynos: Use FOLL_LONGTERM for g2d cmdlists
  misc/habana: Stop using frame_vector helpers
  misc/habana: Use FOLL_LONGTERM for userptr
  mm/frame-vector: Use FOLL_LONGTERM
  media: videobuf2: Move frame_vector into media subsystem
  mm: Close race in generic_access_phys
  mm: Add unsafe_follow_pfn
  media/videbuf1|2: Mark follow_pfn usage as unsafe
  vfio/type1: Mark follow_pfn as unsafe
  PCI: Obey iomem restrictions for procfs mmap
  /dev/mem: Only set filp->f_mapping
  resource: Move devmem revoke code to resource framework
  sysfs: Support zapping of binary attr mmaps
  PCI: Revoke mappings like devmem
  RFC: kvm: pass kvm argument to follow_pfn callsites
  RFC: mm: add mmu_notifier argument to follow_pfn

 arch/powerpc/kvm/book3s_64_mmu_hv.c           |   2 +-
 arch/powerpc/kvm/book3s_64_mmu_radix.c        |   2 +-
 arch/powerpc/kvm/e500_mmu_host.c              |   2 +-
 arch/x86/kvm/mmu/mmu.c                        |   8 +-
 drivers/char/mem.c                            |  86 +------------
 drivers/gpu/drm/exynos/Kconfig                |   1 -
 drivers/gpu/drm/exynos/exynos_drm_g2d.c       |  48 ++++----
 drivers/media/common/videobuf2/Kconfig        |   1 -
 drivers/media/common/videobuf2/Makefile       |   1 +
 .../media/common/videobuf2}/frame_vector.c    |  57 +++------
 .../media/common/videobuf2/videobuf2-memops.c |   3 +-
 drivers/media/platform/omap/Kconfig           |   1 -
 drivers/media/v4l2-core/videobuf-dma-contig.c |   2 +-
 drivers/misc/habanalabs/Kconfig               |   1 -
 drivers/misc/habanalabs/common/habanalabs.h   |   6 +-
 drivers/misc/habanalabs/common/memory.c       |  50 +++-----
 drivers/pci/pci-sysfs.c                       |   4 +
 drivers/pci/proc.c                            |   6 +
 drivers/vfio/vfio_iommu_type1.c               |   4 +-
 fs/sysfs/file.c                               |  11 ++
 include/linux/ioport.h                        |   6 +-
 include/linux/kvm_host.h                      |   9 +-
 include/linux/mm.h                            |  50 +-------
 include/linux/sysfs.h                         |   2 +
 include/media/frame_vector.h                  |  47 +++++++
 include/media/videobuf2-core.h                |   1 +
 kernel/resource.c                             |  98 ++++++++++++++-
 mm/Kconfig                                    |   3 -
 mm/Makefile                                   |   1 -
 mm/memory.c                                   | 115 +++++++++++++++---
 mm/nommu.c                                    |  48 +++++++-
 security/Kconfig                              |  13 ++
 virt/kvm/kvm_main.c                           |  56 +++++----
 33 files changed, 447 insertions(+), 298 deletions(-)
 rename {mm => drivers/media/common/videobuf2}/frame_vector.c (84%)
 create mode 100644 include/media/frame_vector.h

-- 
2.29.2

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^ permalink raw reply	[flat|nested] 39+ messages in thread

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Thread overview: 39+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-19 14:41 [PATCH v6 00/17] follow_pfn and other iomap races Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 01/17] drm/exynos: Stop using frame_vector helpers Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 02/17] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 03/17] misc/habana: Stop using frame_vector helpers Daniel Vetter
2020-11-21 12:47   ` Oded Gabbay
2020-11-19 14:41 ` [PATCH v6 04/17] misc/habana: Use FOLL_LONGTERM for userptr Daniel Vetter
2020-11-21 10:15   ` Oded Gabbay
2020-11-19 14:41 ` [PATCH v6 05/17] mm/frame-vector: Use FOLL_LONGTERM Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 06/17] media: videobuf2: Move frame_vector into media subsystem Daniel Vetter
2020-11-20  8:07   ` Hans Verkuil
2020-11-19 14:41 ` [PATCH v6 07/17] mm: Close race in generic_access_phys Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 08/17] mm: Add unsafe_follow_pfn Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 09/17] media/videbuf1|2: Mark follow_pfn usage as unsafe Daniel Vetter
2020-11-20  8:06   ` Hans Verkuil
2020-11-20  8:28     ` Hans Verkuil
2020-11-20  8:32       ` Tomasz Figa
2020-11-20  9:18       ` Daniel Vetter
2020-11-20 10:38         ` Hans Verkuil
2020-11-20 10:51           ` Daniel Vetter
2020-11-20 12:08             ` Hans Verkuil
2020-11-20 12:23               ` Tomasz Figa
2020-11-24 14:16                 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 10/17] vfio/type1: Mark follow_pfn " Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 11/17] PCI: Obey iomem restrictions for procfs mmap Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 12/17] /dev/mem: Only set filp->f_mapping Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 13/17] resource: Move devmem revoke code to resource framework Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 14/17] sysfs: Support zapping of binary attr mmaps Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 15/17] PCI: Revoke mappings like devmem Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 16/17] RFC: kvm: pass kvm argument to follow_pfn callsites Daniel Vetter
2020-11-20 15:33   ` Paolo Bonzini
2020-11-20 15:44     ` Daniel Vetter
2020-11-20 15:55       ` Paolo Bonzini
2020-11-19 14:41 ` [PATCH v6 17/17] RFC: mm: add mmu_notifier argument to follow_pfn Daniel Vetter
2020-11-20 18:30   ` Jason Gunthorpe
2020-11-24 14:28     ` Daniel Vetter
2020-11-24 15:55       ` Jason Gunthorpe
2020-11-25  9:00         ` Daniel Vetter
2020-11-27 13:12 ` [PATCH v6 00/17] follow_pfn and other iomap races Jason Gunthorpe
2020-11-27 15:36   ` Daniel Vetter

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