mbox series

[v8,0/9] VIRTIO-IOMMU: Introduce aw-bits and granule options

Message ID 20240307134445.92296-1-eric.auger@redhat.com (mailing list archive)
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Series VIRTIO-IOMMU: Introduce aw-bits and granule options | expand

Message

Eric Auger March 7, 2024, 1:43 p.m. UTC 
This is a respin of
[1] [PATCH v5 0/4] VIRTIO-IOMMU: Introduce an aw-bits option
(https://lore.kernel.org/all/20240215084315.863897-1-eric.auger@redhat.com/)

which now also integrates

[PATCH v6 0/3] VIRTIO-IOMMU: Set default granule to host page size
(https://lore.kernel.org/all/20240227165730.14099-1-eric.auger@redhat.com/)

The introduction of those 2 new options and their new default values
fix bugs when assigning VFIO devices protected by a virtio-iommu.

patches 1 - 4: intro of the granule property, collected reviews
- we used to set the default granule to 4k. This causes failures
  when hotplugging a VFIO device on a 64kB/64kB host/guest config:
  "vfio: DMA mapping failed, unable to continue". When the device
  is hotplugged the granule is already frozen to 4k wheras 64k is
  needed. This series introduces a new granule option which is set
  by default to the host page size.

patches 5 - 9: intro of the aw-bits property, needs further review
- we used to set the input address width to 64b. This causes
  failures with some assigned devices where the guest driver
  tries to use the full 64b input range whereas the physical IOMMU
  supports less bits (39/48 gaw for instance on VTD). New default
  usually match the host HW capability.

For more details please see the cover letter of [1] and [2].
This series can be found at:
https://github.com/eauger/qemu/tree/granule_aw_bits_v8

History:
v7 -> v8:
- address Phil's comments: return earlier on bad aw-bits,
  doc improvement

v6 -> v7:
- Made property static in virt and pc_q35. Fix qtest 32 limit.


Eric Auger (9):
  qdev: Add a granule_mode property
  virtio-iommu: Add a granule property
  virtio-iommu: Change the default granule to the host page size
  qemu-options.hx: Document the virtio-iommu-pci granule option
  virtio-iommu: Trace domain range limits as unsigned int
  virtio-iommu: Add an option to define the input range width
  hw/i386/q35: Set virtio-iommu aw-bits default value to 39
  hw/arm/virt: Set virtio-iommu aw-bits default value to 48
  qemu-options.hx: Document the virtio-iommu-pci aw-bits option

 qapi/virtio.json                    | 18 +++++++++++++++
 include/hw/qdev-properties-system.h |  3 +++
 include/hw/virtio/virtio-iommu.h    |  3 +++
 hw/arm/virt.c                       | 17 ++++++++++++++
 hw/core/machine.c                   |  6 ++++-
 hw/core/qdev-properties-system.c    | 14 +++++++++++
 hw/i386/pc_q35.c                    |  9 ++++++++
 hw/virtio/virtio-iommu.c            | 36 +++++++++++++++++++++++++----
 tests/qtest/virtio-iommu-test.c     |  2 +-
 hw/virtio/trace-events              |  2 +-
 qemu-options.hx                     | 11 +++++++++
 11 files changed, 114 insertions(+), 7 deletions(-)