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/*
* Copyright (c) 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* 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 the copyright holders 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.
*
* Authors: Andreas Sandberg
*/
#include "cpu/kvm/device.hh"
#include <linux/kvm.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <cassert>
#include <cerrno>
#include "base/logging.hh"
KvmDevice::KvmDevice(int _fd)
: fd(_fd)
{
}
KvmDevice::~KvmDevice()
{
close(fd);
}
void
KvmDevice::getAttrPtr(uint32_t group, uint64_t attr, void *data) const
{
#ifdef KVM_GET_DEVICE_ATTR
struct kvm_device_attr dattr = {
0, // Flags
group,
attr,
reinterpret_cast<uint64_t>(data),
};
if (ioctl(KVM_GET_DEVICE_ATTR, &dattr) == -1) {
panic("Failed to get attribute (group: %i, attr: %i, errno: %i)",
group, attr, errno);
}
#else
panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
#endif
}
void
KvmDevice::setAttrPtr(uint32_t group, uint64_t attr, const void *data) const
{
#ifdef KVM_SET_DEVICE_ATTR
struct kvm_device_attr dattr = {
0, // Flags
group,
attr,
reinterpret_cast<uint64_t>(data),
};
if (ioctl(KVM_SET_DEVICE_ATTR, &dattr) == -1) {
panic("Failed to set attribute (group: %i, attr: %i, errno: %i)",
group, attr, errno);
}
#else
panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
#endif
}
bool
KvmDevice::hasAttr(uint32_t group, uint64_t attr) const
{
#ifdef KVM_HAS_DEVICE_ATTR
struct kvm_device_attr dattr = {
0, // Flags
group,
attr,
0, // Data address (ignored)
};
return ioctl(KVM_HAS_DEVICE_ATTR, &dattr) == 0;
#else
panic("Kernel headers don't support KVM_HAS_DEVICE_ATTR\n");
#endif
}
int
KvmDevice::ioctl(int request, long p1) const
{
assert(fd != -1);
return ::ioctl(fd, request, p1);
}
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