Hi, This is a follow up to the previous RFC patchset [0] for supporting Tegra241 vCMDQ, separated out from the series for accelerated SMMUv3. This patchset is tested with Shameer's v2 qemu series [1] for vCMDQ support. The accelerated SMMUv3 series for qemu and Libvirt [2] are pre-requisites for vCMDQ support, as accelerated SMMUv3 must be enabled alongside vCMDQ. A new 'cmdqv' <iommu> driver attribute is introduced to toggle enabling vCMDQ support. An additional 'identifier' <iommu> driver attribute is introduced to specify an enumeration-independent SMMUv3 device identifier. This identifier is used so that both Tegra DSDT and SMMUv3 IORT use the same identifier. For instance, specifying hostdevs associated with multiple accelerated SMMUs + CMDQV enabled, configured to be routed to pcie-expander-bus controllers in a way where VFIO device to SMMUv3 associations are matched with the host: <devices> ... <controller type='pci' index='1' model='pcie-expander-bus'> <model name='pxb-pcie'/> <target busNr='252'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/> </controller> <controller type='pci' index='2' model='pcie-expander-bus'> <model name='pxb-pcie'/> <target busNr='248'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </controller> ... <controller type='pci' index='21' model='pcie-root-port'> <model name='pcie-root-port'/> <target chassis='21' port='0x0'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </controller> <controller type='pci' index='22' model='pcie-root-port'> <model name='pcie-root-port'/> <target chassis='22' port='0xa8'/> <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/> </controller> ... <hostdev mode='subsystem' type='pci' managed='no'> <source> <address domain='0x0009' bus='0x01' slot='0x00' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x15' slot='0x00' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='no'> <source> <address domain='0x0019' bus='0x01' slot='0x00' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x16' slot='0x00' function='0x0'/> </hostdev> <iommu model='smmuv3'> <driver pciBus='1' accel='on' ats='on' ril='on' ssidSize='20' oas='44' cmdqv='on' identifier='0'/> </iommu> <iommu model='smmuv3'> <driver pciBus='2' accel='on' ats='on' ril='on' ssidSize='20' oas='44' cmdqv='on' identifier='1'/> </iommu> </devices> This would get translated to a qemu command line with the arguments below: -device '{"driver":"pxb-pcie","bus_nr":252,"id":"pci.1","bus":"pcie.0","addr":"0x1"}' \ -device '{"driver":"pxb-pcie","bus_nr":248,"id":"pci.2","bus":"pcie.0","addr":"0x2"}' \ -device '{"driver":"pcie-root-port","port":0,"chassis":21,"id":"pci.21","bus":"pci.1","addr":"0x0"}' \ -device '{"driver":"pcie-root-port","port":168,"chassis":22,"id":"pci.22","bus":"pci.2","addr":"0x0"}' \ -device '{"driver":"arm-smmuv3","primary-bus":"pci.1","id":"iommu0","accel":true,"ats":true,"tegra241-cmdqv":true,"identifier":0,"ril":true,"pasid":true,"oas":44}' \ -device '{"driver":"arm-smmuv3","primary-bus":"pci.2","id":"iommu1","accel":true,"ats":true,"tegra241-cmdqv":true,"identifier":1,"ril":true,"pasid":true,"oas":44}' \ -device '{"driver":"vfio-pci","host":"0009:01:00.0","id":"hostdev0","bus":"pci.21","addr":"0x0"}' \ -device '{"driver":"vfio-pci","host":"0019:01:00.0","id":"hostdev1","bus":"pci.22","addr":"0x0"}' \ This series is on Github: https://github.com/NathanChenNVIDIA/libvirt/tree/cmdqv-02-26/ Thanks, Nathan Changes: - Support 'identifier' attribute for SMMUv3 [0] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/message/VRSS... [1] https://lore.kernel.org/qemu-devel/20260206144823.80655-1-skolothumtho@nvidi... [2] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/5GG76... Nathan Chen (3): qemu: Support NVIDIA Tegra241 CMDQV for SMMUv3 qemu: Support enumeration-independent SMMUv3 identifier tests: qemuxmlconfdata: provide cmdqv sample XML and CLI args docs/formatdomain.rst | 13 ++++ src/conf/domain_conf.c | 32 ++++++++++ src/conf/domain_conf.h | 2 + src/conf/domain_validate.c | 8 ++- src/conf/schemas/domaincommon.rng | 10 ++++ src/qemu/qemu_command.c | 2 + ...u-smmuv3-pci-bus-cmdqv.aarch64-latest.args | 40 +++++++++++++ ...mu-smmuv3-pci-bus-cmdqv.aarch64-latest.xml | 59 +++++++++++++++++++ .../iommu-smmuv3-pci-bus-cmdqv.xml | 49 +++++++++++++++ tests/qemuxmlconftest.c | 1 + 10 files changed, 215 insertions(+), 1 deletion(-) create mode 100644 tests/qemuxmlconfdata/iommu-smmuv3-pci-bus-cmdqv.aarch64-latest.args create mode 100644 tests/qemuxmlconfdata/iommu-smmuv3-pci-bus-cmdqv.aarch64-latest.xml create mode 100644 tests/qemuxmlconfdata/iommu-smmuv3-pci-bus-cmdqv.xml -- 2.43.0