Hi All,
Changes from v3:
https://lore.kernel.org/qemu-devel/20250602154110.48392-1-shameerali.kolothum.th...@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.th...@huawei.com/
[1]:https://lore.kernel.org/qemu-devel/20230421165037.2506-1-jonathan.came...@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
