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</pre></div><pre class="rust"><code><span class="kw">use </span>std::convert::{AsMut, AsRef};
<span class="kw">use </span>std::io;
<span class="kw">use </span>std::ops;
<span class="kw">use </span>std::os::unix::io::AsRawFd;
<span class="kw">pub mod </span>cap;
<span class="kw">mod </span>fmt;
<span class="kw">pub mod </span>kvm;
<span class="kw">pub mod </span>kvm_sys;
<span class="kw">pub mod </span>vcpu;
<span class="kw">pub mod </span>vm;
<span class="kw">pub mod </span>x86_64;
<span class="doccomment">/// Strong type representing physical addresses.
</span><span class="kw">pub struct </span>PhysAddr(<span class="kw">pub </span>u64);
<span class="doccomment">/// Helper to turn libc return values into an [io::Result](std::io::Result). Returns
/// [`Error::last_os_error`](std::io::Error::last_os_error) if `ret < 0`.
</span><span class="kw">fn </span>libcret(ret: libc::c_int) -> io::Result<libc::c_int> {
<span class="kw">if </span>ret < <span class="number">0 </span>{
<span class="prelude-val">Err</span>(io::Error::last_os_error())
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(ret)
}
}
<span class="doccomment">/// Wrapper of `libc::ioctl` for KVM ioctls with one argument and returning an
/// [`io::Result`](std::io::Result).
</span><span class="kw">fn </span>ioctl<F: AsRawFd>(fd: <span class="kw-2">&</span>F, cmd: u64, arg: u64) -> io::Result<libc::c_int> {
libcret(<span class="kw">unsafe </span>{ libc::ioctl(fd.as_raw_fd(), cmd, arg) })
}
<span class="doccomment">/// Wrapper to safely allocate memory for guest VMs.
///
/// The underlying memory is freed automatically once the `UserMem` instance is dropped.
///
/// Memory can be mapped into a guest VM with
/// [`Vm::set_user_memory_region`](crate::vm::Vm::set_user_memory_region).
</span><span class="kw">pub struct </span>UserMem {
ptr: <span class="kw-2">*mut </span>u8,
len: usize,
}
<span class="kw">impl </span>UserMem {
<span class="doccomment">/// Allocate a zero-initialized memory region of `len` bytes.
</span><span class="kw">pub fn </span>new(len: usize) -> io::Result<UserMem> {
<span class="kw">let </span>ptr = <span class="kw">unsafe </span>{
libc::mmap(
std::ptr::null_mut(),
len,
libc::PROT_READ | libc::PROT_WRITE,
libc::MAP_PRIVATE | libc::MAP_ANONYMOUS,
-<span class="number">1</span>,
<span class="number">0</span>,
)
};
<span class="kw">if </span>ptr == libc::MAP_FAILED {
<span class="prelude-val">Err</span>(io::Error::last_os_error())
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(UserMem {
ptr: ptr.cast(),
len,
})
}
}
<span class="doccomment">/// Allocate a zero-initialized memory region of `len` bytes and initialize the first bytes
/// with `init_from`.
///
/// # Panics
///
/// Panics if `init_from` is larger than the memory size `len`.
</span><span class="kw">pub fn </span>with_init(len: usize, init_from: <span class="kw-2">&</span>[u8]) -> io::Result<UserMem> {
<span class="macro">assert!</span>(len >= init_from.len());
<span class="kw">let </span><span class="kw-2">mut </span>m = UserMem::new(len)<span class="question-mark">?</span>;
m.load(PhysAddr(<span class="number">0</span>), init_from);
<span class="prelude-val">Ok</span>(m)
}
<span class="doccomment">/// Load the bytes stored in `data` into memory at physical address `addr`.
///
/// # Panics
///
/// Panics if `addr + data.len` is larger than the memory size `len`.
</span><span class="kw">pub fn </span>load(<span class="kw-2">&mut </span><span class="self">self</span>, addr: PhysAddr, data: <span class="kw-2">&</span>[u8]) {
<span class="macro">assert!</span>(<span class="self">self</span>.len >= addr.<span class="number">0 </span><span class="kw">as </span>usize + data.len());
<span class="kw">let </span>addr = addr.<span class="number">0 </span><span class="kw">as </span>usize;
<span class="self">self</span>.as_mut()[addr..addr + data.len()].copy_from_slice(data);
}
}
<span class="kw">impl </span>ops::Drop <span class="kw">for </span>UserMem {
<span class="doccomment">/// Free underlying memory.
</span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
<span class="kw">unsafe </span>{ libc::munmap(<span class="self">self</span>.ptr.cast(), <span class="self">self</span>.len) };
}
}
<span class="kw">impl </span>AsRef<[u8]> <span class="kw">for </span>UserMem {
<span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] {
<span class="kw">unsafe </span>{ std::slice::from_raw_parts(<span class="self">self</span>.ptr, <span class="self">self</span>.len) }
}
}
<span class="kw">impl </span>AsMut<[u8]> <span class="kw">for </span>UserMem {
<span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[u8] {
<span class="kw">unsafe </span>{ std::slice::from_raw_parts_mut(<span class="self">self</span>.ptr, <span class="self">self</span>.len) }
}
}
<span class="doccomment">/// Internal wrapper to automatically `mmap` and `munmap` the the [`struct kvm_run`][kvm_run]
/// for a given VPCU.
///
/// [kvm_run]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#the-kvm-run-structure
</span><span class="kw">struct </span>KvmRun {
ptr: <span class="kw-2">*mut </span>kvm_sys::kvm_run,
len: usize,
}
<span class="kw">impl </span>KvmRun {
<span class="doccomment">/// Mmap the `struct kvm_run` for a given `VCPU` referenced by the argument file descriptor
/// `vcpu`.
</span><span class="kw">fn </span>new<F: AsRawFd>(vcpu: <span class="kw-2">&</span>F, len: usize) -> io::Result<KvmRun> {
<span class="kw">let </span>ptr = <span class="kw">unsafe </span>{
libc::mmap(
std::ptr::null_mut(),
len,
libc::PROT_READ | libc::PROT_WRITE,
libc::MAP_SHARED,
vcpu.as_raw_fd(),
<span class="number">0</span>,
)
};
<span class="kw">if </span>ptr == libc::MAP_FAILED {
<span class="prelude-val">Err</span>(io::Error::last_os_error())
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(KvmRun {
ptr: ptr.cast(),
len,
})
}
}
}
<span class="kw">impl </span>ops::Drop <span class="kw">for </span>KvmRun {
<span class="doccomment">/// Munmap the mmaped `struct kvm_run`.
</span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
<span class="kw">unsafe </span>{ libc::munmap(<span class="self">self</span>.ptr.cast(), <span class="self">self</span>.len) };
}
}
<span class="kw">impl </span>AsRef<kvm_sys::kvm_run> <span class="kw">for </span>KvmRun {
<span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>kvm_sys::kvm_run {
<span class="kw">unsafe </span>{ <span class="kw-2">&*</span>(<span class="self">self</span>.ptr <span class="kw">as </span><span class="kw-2">*const </span>kvm_sys::kvm_run) }
}
}
<span class="kw">impl </span>AsMut<kvm_sys::kvm_run> <span class="kw">for </span>KvmRun {
<span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>kvm_sys::kvm_run {
<span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span>(<span class="self">self</span>.ptr <span class="kw">as </span><span class="kw-2">*mut </span>kvm_sys::kvm_run) }
}
}
</code></pre></div></section></main></body></html>
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