spapr_vscsi: do not allow device hotplug

We do not implement hotplug in the vscsi bus, but we forgot to
tell qdev about it. The result is that users are able to hotplug
devices in the vscsi bus, the devices appear in qdev, but they
aren't usable by the guest OS unless the user reboots it first.

Setting qbus hotplug_handler to NULL will tell qdev-monitor, via
qbus_is_hotpluggable(), that we do not support hotplug operations
in spapr_vscsi.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1862059
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20200820190635.379657-1-danielhb413@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/scsi/spapr_vscsi.c b/hw/scsi/spapr_vscsi.c
index d17dc03c73f3041fbea79ffabd65c1b0329be29d..57f0a1336f887044c54457fabf1a3668a6e4d9ff 100644 (file)
--- a/hw/scsi/spapr_vscsi.c
+++ b/hw/scsi/spapr_vscsi.c
@@ -1219,6 +1219,9 @@ static void spapr_vscsi_realize(SpaprVioDevice *dev, Error **errp)
 
     scsi_bus_new(&s->bus, sizeof(s->bus), DEVICE(dev),
                  &vscsi_scsi_info, NULL);
+
+    /* ibmvscsi SCSI bus does not allow hotplug. */
+    qbus_set_hotplug_handler(BUS(&s->bus), NULL);
 }
 
 void spapr_vscsi_create(SpaprVioBus *bus)