4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <sys/eventfd.h>
36 #include <sys/ioctl.h>
37 #include <sys/types.h>
43 #include "eventfd_link/eventfd_link.h"
44 #include "eventfd_copy.h"
45 #include "vhost-net.h"
47 static const char eventfd_cdev[] = "/dev/eventfd-link";
49 static int eventfd_link = -1;
54 if (eventfd_link >= 0)
57 eventfd_link = open(eventfd_cdev, O_RDWR);
58 if (eventfd_link < 0) {
59 RTE_LOG(ERR, VHOST_CONFIG,
60 "eventfd_link module is not loaded\n");
70 if (eventfd_link >= 0)
76 * This function uses the eventfd_link kernel module to copy an eventfd file
77 * descriptor provided by QEMU in to our process space.
80 eventfd_copy(int target_fd, int target_pid)
83 struct eventfd_copy2 eventfd_copy2;
86 /* Open the character device to the kernel module. */
87 /* TODO: check this earlier rather than fail until VM boots! */
88 if (eventfd_init() < 0)
91 eventfd_copy2.fd = target_fd;
92 eventfd_copy2.pid = target_pid;
93 eventfd_copy2.flags = O_NONBLOCK | O_CLOEXEC;
94 /* Call the IOCTL to copy the eventfd. */
95 ret = ioctl(eventfd_link, EVENTFD_COPY2, &eventfd_copy2);
98 RTE_LOG(ERR, VHOST_CONFIG,
99 "EVENTFD_COPY2 ioctl failed\n");