spapr/pci: Free MSIs during reset

When the machine is reset, the MSI bitmap is cleared but the allocated
MSIs are not freed. Some operating systems, such as AIX, can detect the
previous configuration and assert.

Empty the MSI cache, this performs the needed cleanup.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <156415228410.1064338.4486161194061636096.stgit@bahia.lan>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/spapr_pci.c

@@ -2080,6 +2080,8 @@ static void spapr_phb_reset(DeviceState *qdev)
     if (spapr_phb_eeh_available(SPAPR_PCI_HOST_BRIDGE(qdev))) {
         spapr_phb_vfio_reset(qdev);
     }
+
+    g_hash_table_remove_all(sphb->msi);
 }
 
 static Property spapr_phb_properties[] = {