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[Qemu-devel] [PATCH v6 0/3] IOMMU: intel_iommu support map and unmap not

From: Aviv B.D
Subject: [Qemu-devel] [PATCH v6 0/3] IOMMU: intel_iommu support map and unmap notifications
Date: Tue, 8 Nov 2016 13:04:21 +0200

From: "Aviv Ben-David" <address@hidden>

* Advertize Cache Mode capability in iommu cap register. 
  This capability is controlled by "cache-mode" property of intel-iommu device.
  To enable this option call QEMU with "-device intel-iommu,cache-mode=true".

* On page cache invalidation in intel vIOMMU, check if the domain belong to
  registered notifier, and notify accordingly.

Currently this patch still doesn't enabling VFIO devices support with vIOMMU 
present. Current problems:
* vfio_iommu_map_notify is not aware about memory range belong to specific 
* memory_region_iommu_replay hangs QEMU on start up while it itterate over 
  64bit address space. Commenting out the call to this function enables 
  workable VFIO device while vIOMMU present.
* vfio_iommu_map_notify should check if address space range is suitable for 
  current notifier.

Changes from v1 to v2:
* remove assumption that the cache do not clears
* fix lockup on high load.

Changes from v2 to v3:
* remove debug leftovers
* split to sepearate commits
* change is_write to flags in vtd_do_iommu_translate, add IOMMU_NO_FAIL 
  to suppress error propagating to guest.

Changes from v3 to v4:
* Add property to intel_iommu device to control the CM capability, 
  default to False.
* Use s->iommu_ops.notify_flag_changed to register notifiers.

Changes from v4 to v4 RESEND:
* Fix codding style pointed by checkpatch.pl script.

Changes from v4 to v5:
* Reduce the number of changes in patch 2 and make flags real bitfield.
* Revert deleted debug prints.
* Fix memory leak in patch 3.

Changes from v5 to v6:
* fix prototype of iommu_translate function for more IOMMU types.
* VFIO will be notified only on the difference, without unmap 
  before change to maps.

Aviv Ben-David (3):
  IOMMU: add option to enable VTD_CAP_CM to vIOMMU capility exposoed to
  IOMMU: change iommu_op->translate's is_write to flags, add support to
    NO_FAIL flag mode
  IOMMU: enable intel_iommu map and unmap notifiers

 exec.c                         |   3 +-
 hw/alpha/typhoon.c             |   2 +-
 hw/i386/amd_iommu.c            |   4 +-
 hw/i386/intel_iommu.c          | 160 +++++++++++++++++++++++++++++++++--------
 hw/i386/intel_iommu_internal.h |   3 +
 hw/pci-host/apb.c              |   2 +-
 hw/ppc/spapr_iommu.c           |   2 +-
 hw/s390x/s390-pci-bus.c        |   2 +-
 include/exec/memory.h          |   6 +-
 include/hw/i386/intel_iommu.h  |  11 +++
 memory.c                       |   3 +-
 11 files changed, 160 insertions(+), 38 deletions(-)


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