hw/arm/smmuv3: Add cmdqv property for SMMUv3 device
Introduce a "cmdqv" property to enable Tegra241 CMDQV support. This is only enabled for accelerated SMMUv3 devices. Reviewed-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com> Tested-by: Eric Auger <eric.auger@redhat.com> Message-id: 20260609112552.378999-32-skolothumtho@nvidia.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Shameer Kolothum committed
Jun 9, 2026 at 12:25 UTC
fced8da695f9f40842aa87d0dfde365c8ef65a36
2 files changed
+16
hw/arm/smmuv3.c
+8
@@ -1994,6 +1994,10 @@ static bool smmu_validate_property(SMMUv3State *s, Error **errp)
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"bits if accel=on");
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return false;
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}
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+ if (s->cmdqv == ON_OFF_AUTO_ON) {
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+ error_setg(errp, "cmdqv can only be enabled if accel=on");
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+ return false;
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+ }
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return true;
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}
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@@ -2144,6 +2148,7 @@ static const Property smmuv3_properties[] = {
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DEFINE_PROP_OAS_MODE("oas", SMMUv3State, oas, OAS_MODE_AUTO),
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DEFINE_PROP_SSIDSIZE_MODE("ssidsize", SMMUv3State, ssidsize,
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SSID_SIZE_MODE_AUTO),
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+ DEFINE_PROP_ON_OFF_AUTO("cmdqv", SMMUv3State, cmdqv, ON_OFF_AUTO_AUTO),
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};
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static void smmuv3_instance_init(Object *obj)
@@ -2194,6 +2199,9 @@ static void smmuv3_class_init(ObjectClass *klass, const void *data)
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"than 0 is required to enable PASID support."
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"Please ensure the value does not exceed the maximum "
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"SubstreamID size supported by the host platform.");
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+ object_class_property_set_description(klass, "cmdqv",
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+ "Enable/disable CMDQV support (for accel=on). "
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+ "Valid values are on, off, and auto. Defaults to auto.");
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}
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static int smmuv3_notify_flag_changed(IOMMUMemoryRegion *iommu,
qemu-options.hx
+8
@@ -1329,6 +1329,14 @@ SRST
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- With accel=off, auto is resolved to 0.
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+ ``cmdqv=on|off|auto`` (default: auto)
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+ Enable hardware Command Queue Virtualization (CMDQV) for the
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+ SMMUv3 command queue. Currently only the NVIDIA Tegra241 CMDQV
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+ implementation is supported.
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+
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+ - With accel=on, auto means the value is automatically derived from the host SMMU.
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+ - With accel=off, auto is resolved to 'off'.
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+
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``-device amd-iommu[,option=...]``
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Enables emulation of an AMD-Vi I/O Memory Management Unit (IOMMU).
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Only available with ``-machine q35``, it supports the following options: