[Qemu-devel] Re: [PATCH 2/2] qdev: add command line option to set global defaults for properties.

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 24, 2009 at 12:06:28PM +0100, Gerd Hoffmann wrote:
> This patch adds infrastructure and command line option for setting
> global defaults for device properties, i.e. you can for example use
> 
>   -global virtio-blk-pci.vectors=0
> 
> to turn off msi by default for all virtio block devices.  The config
> file syntax is:
> 
> [global]
>   driver = "virtio-blk-pci"
>   property = "vectors"
>   value = "0"

Where's this documented?

> This can also be used to set properties for devices which are not
> created via -device but implicitly via machine init, i.e.
> 
>   -global isa-fdc,driveA=<name>
> 

...

> diff --git a/qemu-options.hx b/qemu-options.hx
> index b65fd74..420b7d8 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -109,6 +109,9 @@ DEF("set", HAS_ARG, QEMU_OPTION_set,
>      "-set group.id.arg=value\n"
>      "                set <arg> parameter for item <id> of type <group>\n"
>      "                i.e. -set drive.$id.file=/path/to/image\n")
> +DEF("global", HAS_ARG, QEMU_OPTION_global,
> +    "-global driver.property=value\n"
> +    "                set a global default for a driver property\n")
>  STEXI
>  @item -drive @var{option}[,@var{option}[,@var{option}[,...]]]

Let's add a hint on how to get the list of drivers and properties?
How would one figure out the command lines you give in
the examples above?


-- 
MST