hw: Deprecate -drive if=scsi with non-onboard HBAs

Block backends defined with "-drive if=T" with T other than "none" are
meant to be picked up by machine initialization code: a suitable
frontend gets created and wired up automatically.

Drives defined with if=scsi are also picked up by SCSI HBAs added with
-device, unlike other interface types.  Deprecate this usage, as follows.

Create the frontends for onboard HBAs in machine initialization code,
exactly like we do for if=ide and other interface types.  Change
scsi_legacy_handle_cmdline() to create a frontend only when it's still
missing, and warn that this usage is deprecated.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1487161136-9018-3-git-send-email-armbru@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/hw/scsi/spapr_vscsi.c b/hw/scsi/spapr_vscsi.c
index 7d447718eb..55ee48c4da 100644
--- a/hw/scsi/spapr_vscsi.c
+++ b/hw/scsi/spapr_vscsi.c
@@ -1215,6 +1215,8 @@ void spapr_vscsi_create(VIOsPAPRBus *bus)
     dev = qdev_create(&bus->bus, "spapr-vscsi");
 
     qdev_init_nofail(dev);
+    scsi_bus_legacy_handle_cmdline(&VIO_SPAPR_VSCSI_DEVICE(dev)->bus,
+                                   false);
 }
 
 static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)