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