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Groups > linux.kernel > #1392470

Re: GUP guarantees wrt to userspace mappings

From Andrea Arcangeli <aarcange@redhat.com>
Newsgroups linux.kernel
Subject Re: GUP guarantees wrt to userspace mappings
Date 2016-05-02 21:20 +0200
Message-ID <rurxT-SM-3@gated-at.bofh.it> (permalink)
References (5 earlier) <rukZs-3a6-23@gated-at.bofh.it> <rumeS-45v-5@gated-at.bofh.it> <runDY-5IL-17@gated-at.bofh.it> <runXl-5Ww-39@gated-at.bofh.it> <ruoJI-6Gm-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Mon, May 02, 2016 at 07:12:52PM +0300, Kirill A. Shutemov wrote:
> Any reason why mmu_notifier is not an option?

No way to trigger an hardware re-tried secondary MMU fault as result
of PCI DMA memory access, and expensive to do an MMU notifier
invalidate if it requires waiting for the DMA to complete (but since
MMU notifier is now sleepable the latter is a secondary concern).

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Thread

[BUG] vfio device assignment regression with THP ref counting  redesign Alex Williamson <alex.williamson@redhat.com> - 2016-04-28 18:30 +0200
  Re: [BUG] vfio device assignment regression with THP ref counting  redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-04-28 20:20 +0200
    Re: [BUG] vfio device assignment regression with THP ref counting  redesign Alex Williamson <alex.williamson@redhat.com> - 2016-04-28 21:00 +0200
      Re: [BUG] vfio device assignment regression with THP ref counting  redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-04-29 01:30 +0200
        Re: [BUG] vfio device assignment regression with THP ref counting  redesign Alex Williamson <alex.williamson@redhat.com> - 2016-04-29 02:50 +0200
        Re: [BUG] vfio device assignment regression with THP ref counting  redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-04-29 03:00 +0200
          Re: [BUG] vfio device assignment regression with THP ref counting  redesign Alex Williamson <alex.williamson@redhat.com> - 2016-04-29 04:50 +0200
            Re: [BUG] vfio device assignment regression with THP ref counting  redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-04-29 09:10 +0200
              Re: [BUG] vfio device assignment regression with THP ref counting  redesign Alex Williamson <alex.williamson@redhat.com> - 2016-04-29 17:20 +0200
              Re: [BUG] vfio device assignment regression with THP ref counting  redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-04-29 18:40 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Alex Williamson <alex.williamson@redhat.com> - 2016-04-30 00:40 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 12:50 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Jerome Glisse <j.glisse@gmail.com> - 2016-05-02 13:20 +0200
                GUP guarantees wrt to userspace mappings redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 14:20 +0200
                Re: GUP guarantees wrt to userspace mappings redesign Jerome Glisse <j.glisse@gmail.com> - 2016-05-02 15:40 +0200
                Re: GUP guarantees wrt to userspace mappings "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 17:10 +0200
                Re: GUP guarantees wrt to userspace mappings Jerome Glisse <j.glisse@gmail.com> - 2016-05-02 17:30 +0200
                Re: GUP guarantees wrt to userspace mappings "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 18:20 +0200
                Re: GUP guarantees wrt to userspace mappings Andrea Arcangeli <aarcange@redhat.com> - 2016-05-02 21:20 +0200
                Re: GUP guarantees wrt to userspace mappings Andrea Arcangeli <aarcange@redhat.com> - 2016-05-02 21:20 +0200
                Re: GUP guarantees wrt to userspace mappings Andrea Arcangeli <aarcange@redhat.com> - 2016-05-02 21:10 +0200
                Re: GUP guarantees wrt to userspace mappings redesign Oleg Nesterov <oleg@redhat.com> - 2016-05-02 17:20 +0200
                Re: GUP guarantees wrt to userspace mappings redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 18:30 +0200
                Re: GUP guarantees wrt to userspace mappings redesign Oleg Nesterov <oleg@redhat.com> - 2016-05-02 19:30 +0200
                Re: GUP guarantees wrt to userspace mappings redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 20:10 +0200
                Re: GUP guarantees wrt to userspace mappings redesign Oleg Nesterov <oleg@redhat.com> - 2016-05-02 20:50 +0200
                Re: GUP guarantees wrt to userspace mappings redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-05-02 21:00 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-05-02 17:30 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-02 18:10 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-05-02 20:10 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Alex Williamson <alex.williamson@redhat.com> - 2016-05-05 03:20 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-05-05 16:40 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-05-05 17:10 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-05 17:20 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign Andrea Arcangeli <aarcange@redhat.com> - 2016-05-05 17:30 +0200
                Re: [BUG] vfio device assignment regression with THP ref counting  redesign "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-05-06 09:30 +0200

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