[Qemu-devel] [PATCH v6 0/3] Introduce IOMMUNotifier struct

[Peter Xu <peterx@redhat.com>]

Hi, Paolo,

If this is to be merged, please take either patch 1-2 or the whole
series (1-3). Both work for me. Thanks!

V6:
- use IOMMUTLBEntry directly for IOMMUNotifier.notify() [David]
- add explicit comment for patch 1 that CHANGE should be treated as a
  MAP then an UNMAP [David]
- add a-b for David on patch 2

V5:
- squash spapr_tce_notify_{started|stopped} into
  spapr_tce_notify_flag_changed [David]
- in spapr_tce_notify_flag_changed: check flags against "!=
  IOMMU_NOTIFIER_NONE", but not "== IOMMU_NOTIFIER_ALL" [David]
- add r-b for David on patch 3

V4:
- change "notifier_caps" into "notifier_flags" [David]
- rename IOMMU_NOTIFIER_{CHANGE|INVALIDATION} with MAP/UNMAP [David]
- introduce IOMMUOps.notify_flag_changed, to replace notify_started
  and notify_stopped [David, Paolo]

V3:
- use QLIST instead of embedding Notifier into IOMMUNotifier [Paolo]
- fix a build error for ppc64-softmmu

The idea originates from one of Alex's reply:

  https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg00254.html

But after further discussions, it seems that only adding a simple type
for notifier is not enough. This series introduced IOMMUNotifier
struct to replace the old Notifier interface. Along with it, we can
provide registration for one (or multiple) of the IOMMU notifications:

- cache invalidations
- entry changes

This is a support material for Jason's vhost dmar patchset.

Please read commit messages for detailed information. Thanks,

Peter Xu (3):
  memory: introduce IOMMUNotifier and its caps
  memory: introduce IOMMUOps.notify_flag_changed
  intel_iommu: allow UNMAP notifiers

 hw/i386/intel_iommu.c         | 18 ++++++++-----
 hw/ppc/spapr_iommu.c          | 18 +++++++------
 hw/vfio/common.c              |  3 ++-
 include/exec/memory.h         | 47 +++++++++++++++++++++++++--------
 include/hw/vfio/vfio-common.h |  2 +-
 memory.c                      | 60 +++++++++++++++++++++++++++++++++----------
 6 files changed, 107 insertions(+), 41 deletions(-)

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2.7.4