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qdev: Do not let the user try to device_add when it cannot work

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Such devices have always been unavailable and omitted from the list of
available devices shown by device_add help.  Until commit 18b6dad
silently broke the former, setting up nasty traps for unwary users,
like this one:

    $ qemu-system-x86_64 -nodefaults -monitor stdio -display none
    QEMU 1.6.50 monitor - type 'help' for more information
    (qemu) device_add apic
    Segmentation fault (core dumped)

I call that a regression.  Fix it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Markus Armbruster 2013-11-28 17:27:03 +01:00 committed by Andreas Färber
parent f3b176402f
commit 7ea5e78f3d
1 changed files with 5 additions and 0 deletions
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5
qdev-monitor.c
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@ -490,6 +490,11 @@ DeviceState *qdev_device_add(QemuOpts *opts)
}
dc = DEVICE_CLASS(oc);
if (dc->cannot_instantiate_with_device_add_yet) {
qerror_report(QERR_INVALID_PARAMETER_VALUE, "driver",
"pluggable device type");
return NULL;
}
/* find bus */
path = qemu_opt_get(opts, "bus");