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-x86_64 -M q35,default_bus_bypass_iommu=on qemu-system-x86_64: Property 'pc-q35-6.1-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: c9e96b04fc19 ("hw/i386: Add a default_bus_bypass_iommu pc machine option") Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org> --- hw/i386/pc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index fb24f000e7..ce4756ad59 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1779,7 +1779,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) object_class_property_add_bool(oc, "hpet", pc_machine_get_hpet, pc_machine_set_hpet); - object_class_property_add_bool(oc, "default_bus_bypass_iommu", + object_class_property_add_bool(oc, "default-bus-bypass-iommu", pc_machine_get_default_bus_bypass_iommu, pc_machine_set_default_bus_bypass_iommu); -- 2.32.0