1 files changed, 104 insertions, 0 deletions
diff --git a/lib/librte_vhost/vhost_cuse/eventfd_copy.c b/lib/librte_vhost/vhost_cuse/eventfd_copy.c
new file mode 100644
index 00000000..154b32a4
--- /dev/null
+++ b/lib/librte_vhost/vhost_cuse/eventfd_copy.c
@@ -0,0 +1,104 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+#include <sys/eventfd.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <rte_log.h>
+
+#include "eventfd_link/eventfd_link.h"
+#include "eventfd_copy.h"
+#include "vhost-net.h"
+
+static const char eventfd_cdev[] = "/dev/eventfd-link";
+
+static int eventfd_link = -1;
+
+int
+eventfd_init(void)
+{
+	if (eventfd_link >= 0)
+		return 0;
+
+	eventfd_link = open(eventfd_cdev, O_RDWR);
+	if (eventfd_link < 0) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"eventfd_link module is not loaded\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int
+eventfd_free(void)
+{
+	if (eventfd_link >= 0)
+		close(eventfd_link);
+	return 0;
+}
+
+/*
+ * This function uses the eventfd_link kernel module to copy an eventfd file
+ * descriptor provided by QEMU in to our process space.
+ */
+int
+eventfd_copy(int target_fd, int target_pid)
+{
+	int ret;
+	struct eventfd_copy2 eventfd_copy2;
+
+
+	/* Open the character device to the kernel module. */
+	/* TODO: check this earlier rather than fail until VM boots! */
+	if (eventfd_init() < 0)
+		return -1;
+
+	eventfd_copy2.fd = target_fd;
+	eventfd_copy2.pid = target_pid;
+	eventfd_copy2.flags = O_NONBLOCK | O_CLOEXEC;
+	/* Call the IOCTL to copy the eventfd. */
+	ret = ioctl(eventfd_link, EVENTFD_COPY2, &eventfd_copy2);
+
+	if (ret < 0) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"EVENTFD_COPY2 ioctl failed\n");
+		return -1;
+	}
+
+	return ret;
+}