Since commit d8fb7d0969d5 ("vl: switch -M parsing to keyval"), machine parameter definitions cannot use underscores, because keyval_dashify() transforms them to dashes and the parser doesn't find the parameter.
This affects option default_bus_bypass_iommu which was introduced in the same release: $ qemu-system-aarch64 -M virt,default_bus_bypass_iommu=on qemu-system-aarch64: Property 'virt-6.1-machine.default-bus-bypass-iommu' not found Rename the parameter to "default-bus-bypass-iommu". Passing "default_bus_bypass_iommu" is still valid since the underscore are transformed automatically. Fixes: 6d7a85483a06 ("hw/arm/virt: Add default_bus_bypass_iommu machine option") Reviewed-by: Eric Auger <eric.au...@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com> Tested-by: Eric Auger <eric.au...@redhat.com> Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org> --- v2: Resending to be merged separately from the equivalent x86 fix, already queued by Paolo [2]. No change other than added review tag. v1: https://lore.kernel.org/qemu-devel/20211013160607.649990-2-jean-phili...@linaro.org/ [2] https://lore.kernel.org/qemu-devel/55e7387a-4bc0-1743-1013-19c38a6ce...@redhat.com/ --- hw/arm/virt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index ca433adb5b..369552ad45 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -2737,10 +2737,10 @@ static void virt_machine_class_init(ObjectClass *oc, void *data) "Set the IOMMU type. " "Valid values are none and smmuv3"); - object_class_property_add_bool(oc, "default_bus_bypass_iommu", + object_class_property_add_bool(oc, "default-bus-bypass-iommu", virt_get_default_bus_bypass_iommu, virt_set_default_bus_bypass_iommu); - object_class_property_set_description(oc, "default_bus_bypass_iommu", + object_class_property_set_description(oc, "default-bus-bypass-iommu", "Set on/off to enable/disable " "bypass_iommu for default root bus"); -- 2.33.0