qemu_vm: add vsock device

1. The cmd line: -device vhost-vsock-pci,id=vhost-vsock0,guest-cid=3
2. guest-cid is between '3' and '0xffffffff - 1'(unsigned 32-bit
 integer. 0-2 and 0xffffffff are reserved)
3. It is a virtio device so should be a pcie device

Signed-off-by: Qianqian Zhu <[email protected]>

shared/cfg/base.cfg

@@ -694,3 +694,6 @@ inputs = ""
 # systems that require this extra setting.
 Host_Ubuntu.m18.u10:
     firewalld_dhcp_workaround = yes
+
+# Add vsock device
+# vsocks = vhost_vsock0

virttest/arch.py

@@ -38,6 +38,8 @@
     NLMSG_ERROR = 2
     # From linux/socket.h
     AF_PACKET = 17
+    # From linux/vhost.h
+    VHOST_VSOCK_SET_GUEST_CID = 0x8008af60
 else:
     # From include/linux/sockios.h
     SIOCSIFHWADDR = 0x8924
@@ -72,6 +74,8 @@
     NLMSG_ERROR = 2
     # From linux/socket.h
     AF_PACKET = 17
+    # From linux/vhost.h
+    VHOST_VSOCK_SET_GUEST_CID = 0x4008af60
 
 
 def get_kvm_module_list():

virttest/qemu_devices/qdevices.py

@@ -1839,7 +1839,7 @@ def is_direct_plug(self, device):
         :param device: the QBaseDevice object
         :return: bool value for directly plug or not.
         """
-        pcie_devices = ["virtio-net-pci", "virtio-blk-pci",
+        pcie_devices = ["virtio-net-pci", "virtio-blk-pci", "vhost-vsock-pci"
                         "virtio-scsi-pci", "virtio-balloon-pci",
                         "virtio-serial-pci", "virtio-rng-pci",
                         "e1000e", "virtio-gpu-device", "qemu-xhci"]

virttest/qemu_vm.py

@@ -9,15 +9,18 @@
 import os
 import logging
 import fcntl
+import struct
 import re
 import random
+import errno
 
 from functools import partial
 
 import aexpect
 from avocado.core import exceptions
 from avocado.utils import process
 from avocado.utils import crypto
+from avocado.utils import linux_modules
 
 import six
 from six.moves import xrange
@@ -1897,6 +1900,46 @@ def sort_key(dev):
                               pci_bus=pci_bus)
                 iov += 1
 
+        def get_cid(cid):
+            """ Get an unused guest cid from system """
+            while cid:
+                cid_c = struct.pack('L', cid)
+                try:
+                    fcntl.ioctl(
+                        vsock_fd, arch.VHOST_VSOCK_SET_GUEST_CID, cid_c)
+                except IOError as e:
+                    if e.errno == errno.EADDRINUSE:
+                        cid += 1
+                        continue
+                    else:
+                        raise e
+                else:
+                    return cid
+
+        # Add vsock device, cid 0-2 are reserved by system
+        vsocks = params.objects('vsocks')
+        if vsocks:
+            vsock_path = "/dev/vhost-vsock"
+            if not os.path.exists(vsock_path):
+                logging.info("vsock module was not loaded, loading it...")
+                if not linux_modules.load_module('vhost_vsock'):
+                    raise exceptions.TestError(
+                        "Failed on loading module vhost_vsock.")
+            vsock_fd = os.open(vsock_path, os.O_RDWR)
+            min_cid = 3
+            for vsock in vsocks:
+                guest_cid = get_cid(min_cid)
+                vsock_params = {"id": vsock, "guest-cid": guest_cid}
+                if '-mmio:' in params.get('machine_type'):
+                    dev_vsock = QDevice('vhost-vsock-device', vsock_params)
+                elif params.get('machine_type').startswith("s390"):
+                    dev_vsock = QDevice("vhost-vsock-ccw", vsock_params)
+                else:
+                    dev_vsock = QDevice('vhost-vsock-pci', vsock_params)
+                devices.insert(dev_vsock)
+                min_cid = guest_cid + 1
+            os.close(vsock_fd)
+
         # Add Memory devices
         add_memorys(devices, params)
         smp = int(params.get("smp", 0))