qmp, hmp: make subsystem/system-vendor identities optional

According to PCI specification, subsystem id and subsystem vendor id
are present only in type 0 and type 2 headers (at different offsets),
but not in type 1 headers.

Thus we should make this data optional in struct PciDeviceId and skip
reporting them via HMP if the information is not available.

Additional (wrong information) about PCI bridges (Type1 devices) has been
added in 5383a705 and fortunately not released. This patch fixes that
problem. The problem was spotted by Markus.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
Message-Id: <20181002135538.12113-1-den@openvz.org>
Reported-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

diff --git a/hmp.c b/hmp.c
index 61ef120423ce00d65f29e09563e55be3615348fa..7828f93a3945ba6baeb752dfb31d06296a661da8 100644 (file)
--- a/hmp.c
+++ b/hmp.c
@@ -837,8 +837,10 @@ static void hmp_info_pci_device(Monitor *mon, const PciDeviceInfo *dev)
 
     monitor_printf(mon, ": PCI device %04" PRIx64 ":%04" PRIx64 "\n",
                    dev->id->vendor, dev->id->device);
-    monitor_printf(mon, "      PCI subsystem %04" PRIx64 ":%04" PRIx64 "\n",
-                   dev->id->subsystem_vendor, dev->id->subsystem);
+    if (dev->id->has_subsystem_vendor && dev->id->has_subsystem) {
+        monitor_printf(mon, "      PCI subsystem %04" PRIx64 ":%04" PRIx64 "\n",
+                       dev->id->subsystem_vendor, dev->id->subsystem);
+    }
 
     if (dev->has_irq) {
         monitor_printf(mon, "      IRQ %" PRId64 ".\n", dev->irq);

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 51d0dec466a19e513f1145fa6d1b205c3e97fda9..b937f0dc0af422466c9aaef0cde295379c11117e 100644 (file)
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1737,9 +1737,6 @@ static PciDeviceInfo *qmp_query_pci_device(PCIDevice *dev, PCIBus *bus,
     info->id = g_new0(PciDeviceId, 1);
     info->id->vendor = pci_get_word(dev->config + PCI_VENDOR_ID);
     info->id->device = pci_get_word(dev->config + PCI_DEVICE_ID);
-    info->id->subsystem = pci_get_word(dev->config + PCI_SUBSYSTEM_ID);
-    info->id->subsystem_vendor =
-        pci_get_word(dev->config + PCI_SUBSYSTEM_VENDOR_ID);
     info->regions = qmp_query_pci_regions(dev);
     info->qdev_id = g_strdup(dev->qdev.id ? dev->qdev.id : "");
 
@@ -1752,6 +1749,16 @@ static PciDeviceInfo *qmp_query_pci_device(PCIDevice *dev, PCIBus *bus,
     if (type == PCI_HEADER_TYPE_BRIDGE) {
         info->has_pci_bridge = true;
         info->pci_bridge = qmp_query_pci_bridge(dev, bus, bus_num);
+    } else if (type == PCI_HEADER_TYPE_NORMAL) {
+        info->id->has_subsystem = info->id->has_subsystem_vendor = true;
+        info->id->subsystem = pci_get_word(dev->config + PCI_SUBSYSTEM_ID);
+        info->id->subsystem_vendor =
+            pci_get_word(dev->config + PCI_SUBSYSTEM_VENDOR_ID);
+    } else if (type == PCI_HEADER_TYPE_CARDBUS) {
+        info->id->has_subsystem = info->id->has_subsystem_vendor = true;
+        info->id->subsystem = pci_get_word(dev->config + PCI_CB_SUBSYSTEM_ID);
+        info->id->subsystem_vendor =
+            pci_get_word(dev->config + PCI_CB_SUBSYSTEM_VENDOR_ID);
     }
 
     return info;

diff --git a/qapi/misc.json b/qapi/misc.json
index f98de3a58c2f5ad1d531a90965b6f9ffcc869500..3a68af9ca301fbd861da1238a8868081a62e17c0 100644 (file)
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -839,8 +839,8 @@
 # Since: 2.4
 ##
 { 'struct': 'PciDeviceId',
-  'data': {'device': 'int', 'vendor': 'int', 'subsystem': 'int',
-            'subsystem-vendor': 'int'} }
+  'data': {'device': 'int', 'vendor': 'int', '*subsystem': 'int',
+            '*subsystem-vendor': 'int'} }
 
 ##
 # @PciDeviceInfo: