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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`."><title>kvm.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-46132b98.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="kvm_rs" data-themes="" data-resource-suffix="" data-rustdoc-version="1.85.0 (4d91de4e4 2025-02-17)" data-channel="1.85.0" data-search-js="search-75f5ac3e.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../../static.files/src-script-56102188.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">kvm_rs/</div>kvm.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers">
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<a href="#73" id="73">73</a></pre></div><pre class="rust"><code><span class="doccomment">//! KVM system ioctls.
</span><span class="kw">use </span>std::fs;
<span class="kw">use </span>std::io;
<span class="kw">use </span>std::os::unix::io::FromRawFd;
<span class="kw">use </span><span class="kw">crate</span>::cap::{CapBool, CapInt};
<span class="kw">use </span><span class="kw">crate</span>::vm::Vm;
<span class="kw">use crate</span>::{ioctl, kvm_sys, libcret};
<span class="doccomment">/// Wrapper for `/dev/kvm` ioctls.
///
/// Representation of the file descriptor obtained by opening `/dev/kvm`.
/// This wrapper provides access to the `system ioctls` as described in [KVM API][kvm].
///
/// [kvm]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#general-description
</span><span class="kw">pub struct </span>Kvm {
kvm: fs::File,
}
<span class="kw">impl </span>Kvm {
<span class="doccomment">/// Open the `/dev/kvm` device.
</span><span class="kw">pub fn </span>new() -> io::Result<Kvm> {
<span class="kw">let </span>kvm = libcret(<span class="kw">unsafe </span>{
libc::open(<span class="string">"/dev/kvm\0"</span>.as_ptr().cast(), libc::O_RDWR | libc::O_CLOEXEC)
})
.map(|fd| <span class="kw">unsafe </span>{ fs::File::from_raw_fd(fd) })<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(
kvm_sys::KVM_API_VERSION,
ioctl(<span class="kw-2">&</span>kvm, kvm_sys::KVM_GET_API_VERSION, <span class="number">0</span>)<span class="question-mark">?
</span>);
<span class="prelude-val">Ok</span>(Kvm { kvm })
}
<span class="kw">fn </span>get_vpcu_mmap_size(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<usize> {
ioctl(<span class="kw-2">&</span><span class="self">self</span>.kvm, kvm_sys::KVM_GET_VCPU_MMAP_SIZE, <span class="number">0</span>).map(|size| size <span class="kw">as </span>usize)
}
<span class="doccomment">/// Create a new virtual machine with the [`KVM_CREATE_VM`][kvm-create-vm] ioctl.
/// Returns a wrapper [`vm::Vm`][crate::vm::Vm] representing the VM.
///
/// [kvm-create-vm]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-create-vm
</span><span class="kw">pub fn </span>create_vm(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<Vm> {
<span class="kw">let </span>vm = ioctl(<span class="kw-2">&</span><span class="self">self</span>.kvm, kvm_sys::KVM_CREATE_VM, <span class="number">0 </span><span class="comment">/* machine id */</span>)
.map(|fd| <span class="kw">unsafe </span>{ fs::File::from_raw_fd(fd) })<span class="question-mark">?</span>;
<span class="kw">let </span>vcpu_mmap_size = <span class="self">self</span>.get_vpcu_mmap_size()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(Vm::new(vm, vcpu_mmap_size))
}
<span class="doccomment">/// Check availability of an extension with the [`KVM_CHECK_EXTENSION`][kvm-check-extension]
/// ioctl.
///
/// [kvm-check-extension]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-check-extension
</span><span class="kw">pub fn </span>check_extenstion(<span class="kw-2">&</span><span class="self">self</span>, cap: CapBool) -> bool {
<span class="kw">let </span>ret = ioctl(<span class="kw-2">&</span><span class="self">self</span>.kvm, kvm_sys::KVM_CHECK_EXTENSION, cap.into());
<span class="macro">matches!</span>(ret, <span class="prelude-val">Ok</span>(ret) <span class="kw">if </span>ret > <span class="number">0</span>)
}
<span class="doccomment">/// Check availability of an extension with the [`KVM_CHECK_EXTENSION`][kvm-check-extension]
/// ioctl.
///
/// [kvm-check-extension]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-check-extension
</span><span class="kw">pub fn </span>check_extenstion_int(<span class="kw-2">&</span><span class="self">self</span>, cap: CapInt) -> i32 {
<span class="kw">let </span>ret = ioctl(<span class="kw-2">&</span><span class="self">self</span>.kvm, kvm_sys::KVM_CHECK_EXTENSION, cap.into());
ret.unwrap_or(<span class="number">0</span>)
}
}
</code></pre></div></section></main></body></html>
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