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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/kvm.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>kvm.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<span class="doccomment">//! KVM system ioctls.</span>
<span class="kw">use</span> <span class="ident">std::fs</span>;
<span class="kw">use</span> <span class="ident">std::io</span>;
<span class="kw">use</span> <span class="ident">std::os::unix::io::FromRawFd</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::cap</span>::{<span class="ident">CapBool</span>, <span class="ident">CapInt</span>};
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::vm::Vm</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">ioctl</span>, <span class="ident">kvm_sys</span>, <span class="ident">libcret</span>};
<span class="doccomment">/// Wrapper for `/dev/kvm` ioctls.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Representation of the file descriptor obtained by opening `/dev/kvm`.</span>
<span class="doccomment">/// This wrapper provides access to the `system ioctls` as described in [KVM API][kvm].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#general-description</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Kvm</span> {
<span class="ident">kvm</span>: <span class="ident">fs::File</span>,
}
<span class="kw">impl</span> <span class="ident">Kvm</span> {
<span class="doccomment">/// Open the `/dev/kvm` device.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span><span class="ident">Kvm</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">kvm</span> <span class="op">=</span> <span class="ident">libcret</span>(<span class="kw">unsafe</span> {
<span class="ident">libc::open</span>(<span class="string">"/dev/kvm\0"</span>.<span class="ident">as_ptr</span>().<span class="ident">cast</span>(), <span class="ident">libc::O_RDWR</span> <span class="op">|</span> <span class="ident">libc::O_CLOEXEC</span>)
})
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">fd</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">fs::File::from_raw_fd</span>(<span class="ident">fd</span>) })<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(
<span class="ident">kvm_sys::KVM_API_VERSION</span>,
<span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="ident">kvm</span>, <span class="ident">kvm_sys::KVM_GET_API_VERSION</span>, <span class="number">0</span>)<span class="question-mark">?</span>
);
<span class="prelude-val">Ok</span>(<span class="ident">Kvm</span> { <span class="ident">kvm</span> })
}
<span class="kw">fn</span> <span class="ident">get_vpcu_mmap_size</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">kvm</span>, <span class="ident">kvm_sys::KVM_GET_VCPU_MMAP_SIZE</span>, <span class="number">0</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">size</span><span class="op">|</span> <span class="ident">size</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="doccomment">/// Create a new virtual machine with the [`KVM_CREATE_VM`][kvm-create-vm] ioctl.</span>
<span class="doccomment">/// Returns a wrapper [`vm::Vm`][crate::vm::Vm] representing the VM.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-create-vm]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-create-vm</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">create_vm</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span><span class="ident">Vm</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">vm</span> <span class="op">=</span> <span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">kvm</span>, <span class="ident">kvm_sys::KVM_CREATE_VM</span>, <span class="number">0</span> <span class="comment">/* machine id */</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">fd</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">fs::File::from_raw_fd</span>(<span class="ident">fd</span>) })<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">vcpu_mmap_size</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_vpcu_mmap_size</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">Vm::new</span>(<span class="ident">vm</span>, <span class="ident">vcpu_mmap_size</span>))
}
<span class="doccomment">/// Check availability of an extension with the [`KVM_CHECK_EXTENSION`][kvm-check-extension]</span>
<span class="doccomment">/// ioctl.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-check-extension]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-check-extension</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">check_extenstion</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">cap</span>: <span class="ident">CapBool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">kvm</span>, <span class="ident">kvm_sys::KVM_CHECK_EXTENSION</span>, <span class="ident">cap</span>.<span class="ident">into</span>());
<span class="macro">matches!</span>(<span class="ident">ret</span>, <span class="prelude-val">Ok</span>(<span class="ident">ret</span>) <span class="kw">if</span> <span class="ident">ret</span> <span class="op">></span> <span class="number">0</span>)
}
<span class="doccomment">/// Check availability of an extension with the [`KVM_CHECK_EXTENSION`][kvm-check-extension]</span>
<span class="doccomment">/// ioctl.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-check-extension]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-check-extension</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">check_extenstion_int</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">cap</span>: <span class="ident">CapInt</span>) <span class="op">-</span><span class="op">></span> <span class="ident">i32</span> {
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">kvm</span>, <span class="ident">kvm_sys::KVM_CHECK_EXTENSION</span>, <span class="ident">cap</span>.<span class="ident">into</span>());
<span class="ident">ret</span>.<span class="ident">unwrap_or</span>(<span class="number">0</span>)
}
}
</pre></div>
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