linux-kernel - [PATCH 0/4] mmu_notifier semantic update

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Date:   Tue, 29 Aug 2017 16:11:28 -0400
From:   Jérôme Glisse <jglisse@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Bernhard Held <berny156@....de>,
        Adam Borowski <kilobyte@...band.pl>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Takashi Iwai <tiwai@...e.de>,
        Nadav Amit <nadav.amit@...il.com>,
        Mike Galbraith <efault@....de>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        axie <axie@....com>, Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: [PATCH 0/4] mmu_notifier semantic update

So we do not want to allow sleep during call to mmu_notifier_invalidate_page()
but some code do not have surrounding mmu_notifier_invalidate_range_start()/
mmu_notifier_invalidate_range_end() or mmu_notifier_invalidate_range()

This patch serie just make sure that there is at least a call (outside spinlock
section) to mmu_notifier_invalidate_range() after mmu_notifier_invalidate_page()

This fix issue with AMD IOMMU v2 while avoiding to introduce issue for others
user of the mmu_notifier API. For releavent threads see:

https://lkml.kernel.org/r/20170809204333.27485-1-jglisse@redhat.com
https://lkml.kernel.org/r/20170804134928.l4klfcnqatni7vsc@black.fi.intel.com
https://marc.info/?l=kvm&m=150327081325160&w=2

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Bernhard Held <berny156@....de>
Cc: Adam Borowski <kilobyte@...band.pl>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Wanpeng Li <kernellwp@...il.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Takashi Iwai <tiwai@...e.de>
Cc: Nadav Amit <nadav.amit@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: axie <axie@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>

Jérôme Glisse (4):
  mm/mmu_notifier: document new behavior for
    mmu_notifier_invalidate_page()
  dax/mmu_notifier: update to new mmu_notifier semantic
  mm/rmap: update to new mmu_notifier_invalidate_page() semantic
  iommu/amd: update to new mmu_notifier_invalidate_page() semantic

 drivers/iommu/amd_iommu_v2.c |  8 --------
 fs/dax.c                     |  8 ++++++--
 include/linux/mmu_notifier.h |  6 ++++++
 mm/rmap.c                    | 18 +++++++++++++++++-
 4 files changed, 29 insertions(+), 11 deletions(-)

-- 
2.13.5