device.cc revision 10859 
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
49#include "base/misc.hh"
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
126