[libvirt] Why not support additional machine args in XML such as max-ram-below-4g?

[Wuzongyong (Euler Dept)]

Since qemu support the arg -machine like that:
-machine [type=]name[,prop[=value][,...]]
So I'm inquisitive about why libvirt doesn't support specify the prop in xml ?
So I can specify the qemu machine args  like -max-raw-below-4g in xml, well, I mean not by specifying the -qemu-command-line in xml.

Thanks,
Zongyong Wu

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