[Qemu-devel] [Discuss] is it good to add codes providing information to libvirt about the qemu's capabilities

[Wayne Xia]

   Currently libvirt seems to invoke qemu by "qemu -help" onetime, and
then analysis the output text to find whether one type of device the
qemu could support. For example, if "qemu -help" prints a text with
"-sdl" then libvirt thought the qemu could accept that.
    But here comes a problem: the output text seems not to adjust its
output according to the qemu's compile configuration, so it is possible
libvirt invoke qemu with -sdl but get "qemu exit" response that "SDL
support is disabled". By default, the sdl is disabled, and the libvirt
thought it is on.
    I wonder if it is a good idea to modify the help function in vl.c,
to let it adjust -help output according to the configuration, but this
would hide some option of "-help" invocation.



-- 
Best Regards

Wayne Xia
mail:address@hidden
tel:86-010-82450803