qga/commands-posix: Send CCW address on s390x with the fsinfo data

We need the CCW address on the libvirt side to correctly identify
the disk, so add this information to the GuestDiskAddress on s390x.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Michael Roth <michael.roth@amd.com>
Message-Id: <20201127082353.448251-1-thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

qga/commands-posix.c

@@ -1029,6 +1029,38 @@ static bool build_guest_fsinfo_for_nonpci_virtio(char const *syspath,
     return true;
 }
 
+/*
+ * Store disk device info for CCW devices (s390x channel I/O devices).
+ * Returns true if information has been stored, or false for failure.
+ */
+static bool build_guest_fsinfo_for_ccw_dev(char const *syspath,
+                                           GuestDiskAddress *disk,
+                                           Error **errp)
+{
+    unsigned int cssid, ssid, subchno, devno;
+    char *p;
+
+    p = strstr(syspath, "/devices/css");
+    if (!p || sscanf(p + 12, "%*x/%x.%x.%x/%*x.%*x.%x/",
+                     &cssid, &ssid, &subchno, &devno) < 4) {
+        g_debug("could not parse ccw device sysfs path: %s", syspath);
+        return false;
+    }
+
+    disk->has_ccw_address = true;
+    disk->ccw_address = g_new0(GuestCCWAddress, 1);
+    disk->ccw_address->cssid = cssid;
+    disk->ccw_address->ssid = ssid;
+    disk->ccw_address->subchno = subchno;
+    disk->ccw_address->devno = devno;
+
+    if (strstr(p, "/virtio")) {
+        build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
+    }
+
+    return true;
+}
+
 /* Store disk device info specified by @sysfs into @fs */
 static void build_guest_fsinfo_for_real_device(char const *syspath,
                                                GuestFilesystemInfo *fs,
@@ -1081,6 +1113,8 @@ static void build_guest_fsinfo_for_real_device(char const *syspath,
 
     if (strstr(syspath, "/devices/pci")) {
         has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp);
+    } else if (strstr(syspath, "/devices/css")) {
+        has_hwinf = build_guest_fsinfo_for_ccw_dev(syspath, disk, errp);
     } else if (strstr(syspath, "/virtio")) {
         has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
     } else {

qga/qapi-schema.json

@@ -846,6 +846,22 @@
   'data': {'domain': 'int', 'bus': 'int',
            'slot': 'int', 'function': 'int'} }
 
+##
+# @GuestCCWAddress:
+#
+# @cssid: channel subsystem image id
+# @ssid: subchannel set id
+# @subchno: subchannel number
+# @devno: device number
+#
+# Since: 6.0
+##
+{ 'struct': 'GuestCCWAddress',
+  'data': {'cssid': 'int',
+           'ssid': 'int',
+           'subchno': 'int',
+           'devno': 'int'} }
+
 ##
 # @GuestDiskAddress:
 #
@@ -856,14 +872,16 @@
 # @unit: unit id
 # @serial: serial number (since: 3.1)
 # @dev: device node (POSIX) or device UNC (Windows) (since: 3.1)
+# @ccw-address: CCW address on s390x (since: 6.0)
 #
 # Since: 2.2
 ##
 { 'struct': 'GuestDiskAddress',
   'data': {'pci-controller': 'GuestPCIAddress',
            'bus-type': 'GuestDiskBusType',
            'bus': 'int', 'target': 'int', 'unit': 'int',
-           '*serial': 'str', '*dev': 'str'} }
+           '*serial': 'str', '*dev': 'str',
+           '*ccw-address': 'GuestCCWAddress'} }
 
 ##
 # @GuestDiskInfo: