Hi All,

Changes from v3:
https://lore.kernel.org/qemu-devel/20250602154110.48392-1-shameerali.kolothum.thodi@huawei.com/

Addressed feedback on v3. Thanks to all.
Major changes:
1. Based on Igor's suggestion, moved the associated primary-bus is of type
   TYPE_PCI_HOST_BRIDGE check to smmu-common.
2. Addressed IORT related comments from Eric
3. Picked up T-by tag from Nathan. Thanks for giving it a spin.
4. Added a documents entry for arm-smmuv3.

Cover letter:

This patch series introduces support for a user-creatable SMMUv3 device
(-device arm-smmuv3) in QEMU.

The implementation is based on feedback received from the RFCv2[0]:
"hw/arm/virt: Add support for user-creatable accelerated SMMUv3"

Currently, QEMU's SMMUv3 emulation (iommu=smmuv3) is tied to the machine
and does not support instantiating multiple SMMUv3 devices—each associated
with a separate PCIe root complex. In contrast, real-world ARM systems
often include multiple SMMUv3 instances, each bound to a different PCIe
root complex.

This series allows to specify multiple SMMUv3 instances as below,

 -device arm-smmuv3,primary-bus=pcie.0,id=smmuv3.0
  ...
 -device arm-smmuv3,primary-bus=pcie.1,,id=smmuv3.1

The multiple SMMUv3 instance support lays the groundwork for supporting
accelerated SMMUv3, as proposed in the aforementioned RFCv2[0]. The
proposed accelerated support will be an optional property like below,
-device arm-smmuv3,primary-bus=pcie.1,accel=on,..

Please note, the accelerated SMMUv3 support is not part of this series
and will be sent out as a separate series later on top of this one.

This series also,

-Supports either the legacy iommu=smmuv3 option or the new
  "-device arm-smmuv3" model.
  -Adds device tree bindings for the new SMMUv3 device on the arm/virt
   machine only, and only for the default pcie.0 root complex.
   (Note: pxb-pcie root complexes are currently not supported with the
    device tree due to known limitations[1].)

Example usage:
  -device arm-smmuv3,primary-bus=pcie.0,id=smmuv3.0
  -device virtio-net-pci,bus=pcie.0
  -device pxb-pcie,id=pcie.1,bus_nr=2
  -device arm-smmuv3,primary-bus=pcie.1,id=smmuv3.1
  -device pcie-root-port,id=pcie.port1,bus=pcie.1
  -device virtio-net-pci,bus=pcie.port1

Please take a look and let me know your feedback.

Thanks,
Shameer
[0]:https://lore.kernel.org/qemu-devel/20250311141045.66620-1-shameerali.kolothum.thodi@huawei.com/
[1]:https://lore.kernel.org/qemu-devel/20230421165037.2506-1-Jonathan.Cameron@huawei.com/

Nicolin Chen (1):
  hw/arm/virt: Add an SMMU_IO_LEN macro

Shameer Kolothum (6):
  hw/arm/smmu-common: Check SMMU has PCIe Root Complex association
  hw/arm/virt-acpi-build: Re-arrange SMMUv3 IORT build
  hw/arm/virt-acpi-build: Update IORT for multiple smmuv3 devices
  hw/arm/virt: Factor out common SMMUV3 dt bindings code
  hw/arm/virt: Allow user-creatable SMMUv3 dev instantiation
  qemu-options.hx: Document the arm-smmuv3 device

 hw/arm/smmu-common.c     |   4 +-
 hw/arm/smmuv3.c          |   2 +
 hw/arm/virt-acpi-build.c | 166 +++++++++++++++++++++++++++++++--------
 hw/arm/virt.c            | 108 ++++++++++++++++++-------
 hw/core/sysbus-fdt.c     |   3 +
 include/hw/arm/virt.h    |   1 +
 qemu-options.hx          |   6 ++
 7 files changed, 228 insertions(+), 62 deletions(-)

-- 
2.47.0