src/cpu/kvm/device.cc

   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
  38 #include "cpu/kvm/device.hh"
  39
  40 #include <linux/kvm.h>
  41 #include <sys/ioctl.h>
  42 #include <unistd.h>
  43
  44 #include <cassert>
  45 #include <cerrno>
  46
  47 #include "base/logging.hh"
  48
  49 KvmDevice::KvmDevice(int _fd)
  50     : fd(_fd)
  51 {
  52 }
  53
  54 KvmDevice::~KvmDevice()
  55 {
  56     close(fd);
  57 }
  58
  59 void
  60 KvmDevice::getAttrPtr(uint32_t group, uint64_t attr, void *data) const
  61 {
  62 #ifdef KVM_GET_DEVICE_ATTR
  63   struct kvm_device_attr dattr = {
  64         0, // Flags
  65         group,
  66         attr,
  67         reinterpret_cast<uint64_t>(data),
  68     };
  69
  70     if (ioctl(KVM_GET_DEVICE_ATTR, &dattr) == -1) {
  71         panic("Failed to get attribute (group: %i, attr: %i, errno: %i)",
  72               group, attr, errno);
  73     }
  74 #else
  75     panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
  76 #endif
  77 }
  78
  79 void
  80 KvmDevice::setAttrPtr(uint32_t group, uint64_t attr, const void *data) const
  81 {
  82 #ifdef KVM_SET_DEVICE_ATTR
  83     struct kvm_device_attr dattr = {
  84         0, // Flags
  85         group,
  86         attr,
  87         reinterpret_cast<uint64_t>(data),
  88     };
  89
  90     if (ioctl(KVM_SET_DEVICE_ATTR, &dattr) == -1) {
  91         panic("Failed to set attribute (group: %i, attr: %i, errno: %i)",
  92               group, attr, errno);
  93     }
  94 #else
  95     panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
  96 #endif
  97 }
  98
  99 bool
 100 KvmDevice::hasAttr(uint32_t group, uint64_t attr) const
 101 {
 102 #ifdef KVM_HAS_DEVICE_ATTR
 103     struct kvm_device_attr dattr = {
 104         0, // Flags
 105         group,
 106         attr,
 107         0, // Data address (ignored)
 108     };
 109
 110     return ioctl(KVM_HAS_DEVICE_ATTR, &dattr) == 0;
 111 #else
 112     panic("Kernel headers don't support KVM_HAS_DEVICE_ATTR\n");
 113 #endif
 114 }
 115
 116 int
 117 KvmDevice::ioctl(int request, long p1) const
 118 {
 119     assert(fd != -1);
 120
 121     return ::ioctl(fd, request, p1);
 122 }
 123