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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";
50 * This function uses the eventfd_link kernel module to copy an eventfd file
51 * descriptor provided by QEMU in to our process space.
54 eventfd_copy(int target_fd, int target_pid)
56 int eventfd_link, ret;
57 struct eventfd_copy eventfd_copy;
58 int fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
63 /* Open the character device to the kernel module. */
64 /* TODO: check this earlier rather than fail until VM boots! */
65 eventfd_link = open(eventfd_cdev, O_RDWR);
66 if (eventfd_link < 0) {
67 RTE_LOG(ERR, VHOST_CONFIG,
68 "eventfd_link module is not loaded\n");
73 eventfd_copy.source_fd = fd;
74 eventfd_copy.target_fd = target_fd;
75 eventfd_copy.target_pid = target_pid;
76 /* Call the IOCTL to copy the eventfd. */
77 ret = ioctl(eventfd_link, EVENTFD_COPY, &eventfd_copy);
81 RTE_LOG(ERR, VHOST_CONFIG,
82 "EVENTFD_COPY ioctl failed\n");