1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
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;
}
|
