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-jgli...@redhat.com https://lkml.kernel.org/r/20170804134928.l4klfcnqatni7...@black.fi.intel.com https://marc.info/?l=kvm&m=150327081325160&w=2 Signed-off-by: Jérôme Glisse <jgli...@redhat.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Bernhard Held <berny...@gmx.de> Cc: Adam Borowski <kilob...@angband.pl> Cc: Andrea Arcangeli <aarca...@redhat.com> Cc: Radim Krčmář <rkrc...@redhat.com> Cc: Wanpeng Li <kernel...@gmail.com> Cc: Paolo Bonzini <pbonz...@redhat.com> Cc: Takashi Iwai <ti...@suse.de> Cc: Nadav Amit <nadav.a...@gmail.com> Cc: Mike Galbraith <efa...@gmx.de> Cc: Kirill A. Shutemov <kirill.shute...@linux.intel.com> Cc: axie <a...@amd.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Dan Williams <dan.j.willi...@intel.com> Cc: Ross Zwisler <ross.zwis...@linux.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
