1/*
2 * Copyright (c) 2015 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Sandberg
38 */
39
40#include "cpu/kvm/device.hh"
41
42#include <linux/kvm.h>
43#include <sys/ioctl.h>
44#include <unistd.h>
45
46#include <cassert>
47#include <cerrno>
48
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50
51KvmDevice::KvmDevice(int _fd)
52 : fd(_fd)
53{
54}
55
56KvmDevice::~KvmDevice()
57{
58 close(fd);
59}
60
61void
62KvmDevice::getAttrPtr(uint32_t group, uint64_t attr, void *data) const
63{
64#ifdef KVM_GET_DEVICE_ATTR
65 struct kvm_device_attr dattr = {
66 0, // Flags
67 group,
68 attr,
69 reinterpret_cast<uint64_t>(data),
70 };
71
72 if (ioctl(KVM_GET_DEVICE_ATTR, &dattr) == -1) {
73 panic("Failed to get attribute (group: %i, attr: %i, errno: %i)",
74 group, attr, errno);
75 }
76#else
77 panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
78#endif
79}
80
81void
82KvmDevice::setAttrPtr(uint32_t group, uint64_t attr, const void *data) const
83{
84#ifdef KVM_SET_DEVICE_ATTR
85 struct kvm_device_attr dattr = {
86 0, // Flags
87 group,
88 attr,
89 reinterpret_cast<uint64_t>(data),
90 };
91
92 if (ioctl(KVM_SET_DEVICE_ATTR, &dattr) == -1) {
93 panic("Failed to set attribute (group: %i, attr: %i, errno: %i)",
94 group, attr, errno);
95 }
96#else
97 panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
98#endif
99}
100
101bool
102KvmDevice::hasAttr(uint32_t group, uint64_t attr) const
103{
104#ifdef KVM_HAS_DEVICE_ATTR
105 struct kvm_device_attr dattr = {
106 0, // Flags
107 group,
108 attr,
109 0, // Data address (ignored)
110 };
111
112 return ioctl(KVM_HAS_DEVICE_ATTR, &dattr) == 0;
113#else
114 panic("Kernel headers don't support KVM_HAS_DEVICE_ATTR\n");
115#endif
116}
117
118int
119KvmDevice::ioctl(int request, long p1) const
120{
121 assert(fd != -1);
122
123 return ::ioctl(fd, request, p1);
124}
125
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