linux-kernel - [GIT PULL] VFIO updates for v6.18-rc1 part 2

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Message-ID: <20251008100846.47bcedd1.alex.williamson@redhat.com>
Date: Wed, 8 Oct 2025 10:08:46 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: <linux-kernel@...r.kernel.org>, "kvm@...r.kernel.org"
 <kvm@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, David
 Hildenbrand <david@...hat.com>, lizhe.67@...edance.com, Cédric Le Goater <clg@...hat.com>
Subject: [GIT PULL] VFIO updates for v6.18-rc1 part 2

Hi Linus,

Sorry for the two part pull request, this is mostly the DMA map/unmap
optimization series that we tried to get into v6.17, but made use of
the nth_page API that generated some objections.  That has since been
removed, but was stalled again by the page_to_section() to
memdesc_section() change, where I opt'd for this two part approach
rather than resolution buried in a merge commit since we saw it coming.
Thanks,

Alex

The following changes since commit fd94619c43360eb44d28bd3ef326a4f85c600a07:

  Merge tag 'zonefs-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs (2025-10-05 20:45:49 -0700)

are available in the Git repository at:

  https://github.com/awilliam/linux-vfio.git tags/vfio-v6.18-rc1-pt2

for you to fetch changes up to 451bb96328981808463405d436bd58de16dd967d:

  vfio: Dump migration features under debugfs (2025-10-06 11:22:48 -0600)

----------------------------------------------------------------
VFIO updates for v6.18-rc1 part 2

 - Optimizations for DMA map and unmap opertions through the type1
   vfio IOMMU backend.  This uses various means of batching and hints
   from the mm structures to improve efficiency and therefore
   performance, resulting in a significant speedup for huge page
   use cases. (Li Zhe)

 - Expose supported device migration features through debugfs.
   (Cédric Le Goater)

----------------------------------------------------------------
Cédric Le Goater (1):
      vfio: Dump migration features under debugfs

Li Zhe (5):
      mm: introduce num_pages_contiguous()
      vfio/type1: optimize vfio_pin_pages_remote()
      vfio/type1: batch vfio_find_vpfn() in function vfio_unpin_pages_remote()
      vfio/type1: introduce a new member has_rsvd for struct vfio_dma
      vfio/type1: optimize vfio_unpin_pages_remote()

 Documentation/ABI/testing/debugfs-vfio |   6 ++
 drivers/vfio/debugfs.c                 |  19 ++++++
 drivers/vfio/vfio_iommu_type1.c        | 112 ++++++++++++++++++++++++++-------
 include/linux/mm.h                     |   7 ++-
 include/linux/mm_inline.h              |  36 +++++++++++
 5 files changed, 158 insertions(+), 22 deletions(-)