On 2/14/25 16:31, Mark Nesky wrote:
Hello,
I am new to the QEMU code base and I am working on a project involving a
custom hardware model representing a customized ppc board. What is the
best way to add command line arguments applicable to my model?
I see options in qemu-options.hx + vl.c, but I am not sure if that is
the right place for arguments that only apply to one model, and I am not
sure how to access those options from my model.
Hi,
options that apply to only a machine or device can use, respectively,
the -machine or -device options.
For -device this is done using the DEFINE_PROP_* macros.
For -machine, which I assume is the case for you, the process is a bit
more complex. A good example, including a varied set of types, can be
found in the spapr_instance_init function of hw/ppc/spapr.c.
Another possibility for -machine is to pass the option down to a
specific device, which usually will be created at startup. For example
this snipped from hw/i386/pc.c adds a "-machine pcspk-audiodev" option:
pcms->pcspk = isa_new(TYPE_PC_SPEAKER);
object_property_add_alias(OBJECT(pcms), "pcspk-audiodev",
OBJECT(pcms->pcspk), "audiodev");
Thanks,
Paolo
I also see the function qemu_opts_create which looks like it can add
command line arguments at runtime, but I am not sure where to use this
in my model since it seems like my model code (machine state, class, and
instance functions) does not run when invoking "qemu-system-ppc -machine
mymodel -help".
If there is some good documentation or examples, please point me in the
right direction.
thanks for your help,
Mark
