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Re: [Qemu-devel] -device foo, help shouldn't be allowed for devices wher
Re: [Qemu-devel] -device foo, help shouldn't be allowed for devices where -device foo is forbidden
Mon, 14 Jan 2019 17:04:53 +0000
On Mon, 14 Jan 2019 at 16:59, Thomas Huth <address@hidden> wrote:
> On 2019-01-14 17:31, Peter Maydell wrote:
> > We prohibit -device foo for non-pluggable devices:
> > $ ./build/all/x86_64-softmmu/qemu-system-x86_64 -device i8257
> > qemu-system-x86_64: -device i8257: Parameter 'driver' expects
> > pluggable device type
> > And we suppress them from "-device help" output too.
> > But we still allow the user to do this:
> > $ ./build/all/x86_64-softmmu/qemu-system-x86_64 -device i8257,help
> > i8257 options:
> > dshift=<int32>
> > base=<int32>
> > pageh-base=<int32>
> > page-base=<int32>
> Could this still be sometimes useful, e.g. when a device is configured
> with the "-global" parameter?
Hmm, good point: some of the properties are usefully human
changeable even for built-in devices. But a lot of them
are not, if you look at the iotkit example.
Perhaps a useful compromise would be filtering out the
"child<" properties? (these are all created via
object_property_add_child() and user changes to them seem
unlikely to be ever something that would work).