usb: add usb-host test

Add test for usb-test (aka pass through).  Requires a physical usb device,
which must be specified in the configuration.  When unconfigured the test
raises TestNAError so the runner flags the test as skipped.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

kvm/tests/usb_host.py

+import logging, re, uuid
+from autotest.client.shared import error
+from autotest.client import utils
+
+@error.context_aware
+def run_usb_host(test, params, env):
+    """
+    Test usb host device passthrough
+
+    @param test: kvm test object
+    @param params: Dictionary with the test parameters
+    @param env: Dictionary with test environment.
+    """
+
+    device = params.get("usb_host_device")
+    if device == None:
+        raise error.TestNAError("not configured (use 'usb_host_device = "
+                                "<vendor>:<product>')")
+    (vendorid,productid) = device.split(":")
+
+    # compose strings
+    lsusb_cmd    = "lsusb -v -d %s" % device;
+    monitor_add  = "device_add usb-host,bus=usbtest.0,id=usbhostdev"
+    monitor_add += ",vendorid=%s" % vendorid
+    monitor_add += ",productid=%s" % productid
+    monitor_del  = "device_del usbhostdev"
+    match_add    = "New USB device found, "
+    match_add   += "idVendor=%s, idProduct=%s" % (vendorid,productid)
+    match_del    = "USB disconnect"
+
+    error.context("Check usb device %s on host" % device, logging.info)
+    try:
+        utils.system(lsusb_cmd)
+    except:
+        raise error.TestNAError("Device %s not present on host" % device)
+
+    error.context("Log into guest", logging.info)
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login()
+    session.cmd_status("dmesg -c")
+
+    error.context("Plugin usb device", logging.info)
+    vm.monitor.cmd(monitor_add)
+    session.cmd_status("sleep 1")
+    session.cmd_status("udevadm settle")
+    messages_add = session.cmd("dmesg -c")
+    for line in messages_add.splitlines():
+        logging.debug("[dmesg add] %s" % line)
+    if messages_add.find(match_add) == -1:
+        raise error.TestFail("kernel didn't detect plugin")
+
+    error.context("Check usb device %s in guest" % device, logging.info)
+    session.cmd(lsusb_cmd)
+
+    error.context("Unplug usb device", logging.info)
+    vm.monitor.cmd(monitor_del)
+    session.cmd_status("sleep 1")
+    messages_del = session.cmd("dmesg -c")
+    for line in messages_del.splitlines():
+        logging.debug("[dmesg del] %s" % line)
+    if messages_del.find(match_del) == -1:
+        raise error.TestFail("kernel didn't detect unplug")
+
+    session.close()