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/VRSSX2NUIZJ6LECKSI5KPEYHYQBABYLL/
[1] https://lore.kernel.org/qemu-devel/20260206144823.80655-1-skolothumtho@nvidia.com/
[2] https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/5GG76AQTTDUHW5KRANPY3QUII4ZOEYRP/
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