[PATCH v4 0/3] Replace private domain with per-group default domain

[Lu Baolu]

Some devices are required to use a specific type (identity or dma) of
default domain when they are used with a vendor iommu. When the system
level default domain type is different from it, the vendor iommu driver
has to request a new default domain with either
iommu_request_dma_domain_for_dev() or iommu_request_dm_for_dev() in the
add_dev() callback. Unfortunately, these two helpers only work when the
group hasn't been assigned to any other devices, hence, some vendor iommu
driver has to use a private domain if it fails to request a new default
one.

Joerg proposed an on-going proposal which makes the default domain
framework to support configuring per-group default domain during boot
process.

https://lkml.org/lkml/2020/4/14/616
[This has been applied in iommu/next.]

Hence, there is no need to keep the private domain implementation
in the Intel IOMMU driver. This patch series aims to remove it.

Best regards,
baolu

Change log:
v3->v4:
 - Make the commit message of the first patch more comprehensive.

v2->v3:
 - Port necessary patches on the top of Joerg's new proposal.
   https://lkml.org/lkml/2020/4/14/616
   The per-group default domain proposed previously in this series
   will be deprecated due to a race concern between domain switching
   and device driver probing.

v1->v2:
 - Rename the iommu ops callback to def_domain_type

Lu Baolu (3):
  iommu/vt-d: Allow 32bit devices to uses DMA domain
  iommu/vt-d: Allow PCI sub-hierarchy to use DMA domain
  iommu/vt-d: Apply per-device dma_ops

 drivers/iommu/intel-iommu.c | 396 +++---------------------------------
 1 file changed, 26 insertions(+), 370 deletions(-)

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2.17.1