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class="ident">std::ops</span>; -<span class="kw">use</span> <span class="ident">std::os::unix::io::AsRawFd</span>; +<!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/lib.rs`."><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin 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href="#165" id="165">165</a> +<a href="#166" id="166">166</a> +</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</span> <span class="kw">mod</span> <span class="ident">cap</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="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</span> <span class="kw">struct</span> <span class="ident">PhysAddr</span>(<span class="kw">pub</span> <span class="ident">u64</span>); +<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</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::c_int</span>) -> <span class="ident">io::Result</span><span class="op"><</span><span class="ident">libc::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::Error::last_os_error</span>()) - } <span class="kw">else</span> { - <span class="prelude-val">Ok</span>(<span class="ident">ret</span>) +<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</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="ident">io::Result</span><span class="op"><</span><span class="ident">libc::c_int</span><span class="op">></span> { - <span class="ident">libcret</span>(<span class="kw">unsafe</span> { <span class="ident">libc::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 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.</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">*mut</span> <span class="ident">u8</span>, - <span class="ident">len</span>: <span class="ident">usize</span>, +<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> <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="ident">io::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::mmap</span>( - <span class="ident">std::ptr::null_mut</span>(), - <span class="ident">len</span>, - <span class="ident">libc::PROT_READ</span> <span class="op">|</span> <span class="ident">libc::PROT_WRITE</span>, - <span class="ident">libc::MAP_PRIVATE</span> <span class="op">|</span> <span class="ident">libc::MAP_ANONYMOUS</span>, - <span class="op">-</span><span class="number">1</span>, +<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> <span class="ident">ptr</span> <span class="op">==</span> <span class="ident">libc::MAP_FAILED</span> { - <span class="prelude-val">Err</span>(<span class="ident">io::Error::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="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</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="ident">io::Result</span><span class="op"><</span><span class="ident">UserMem</span><span class="op">></span> { - <span class="macro">assert!</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="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> <span class="ident">m</span> <span class="op">=</span> <span class="ident">UserMem::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="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`.</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">&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="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="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> <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">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> <span class="ident">ops::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">&mut</span> <span class="self">self</span>) { - <span class="kw">unsafe</span> { <span class="ident">libc::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>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> <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="kw-2">&</span>[<span class="ident">u8</span>] { - <span class="kw">unsafe</span> { <span class="ident">std::slice::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>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> <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">&mut</span> <span class="self">self</span>) -> <span class="kw-2">&mut</span> [<span class="ident">u8</span>] { - <span class="kw">unsafe</span> { <span class="ident">std::slice::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="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]</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">*mut</span> <span class="ident">kvm_sys::kvm_run</span>, - <span class="ident">len</span>: <span class="ident">usize</span>, +<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> <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="ident">io::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::mmap</span>( - <span class="ident">std::ptr::null_mut</span>(), - <span class="ident">len</span>, - <span class="ident">libc::PROT_READ</span> <span class="op">|</span> <span class="ident">libc::PROT_WRITE</span>, - <span class="ident">libc::MAP_SHARED</span>, - <span class="ident">vcpu</span>.<span class="ident">as_raw_fd</span>(), +<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> <span class="ident">ptr</span> <span class="op">==</span> <span class="ident">libc::MAP_FAILED</span> { - <span class="prelude-val">Err</span>(<span class="ident">io::Error::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">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> <span class="ident">ops::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">&mut</span> <span class="self">self</span>) { - <span class="kw">unsafe</span> { <span class="ident">libc::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>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> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">kvm_sys::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="kw-2">&</span><span class="ident">kvm_sys::kvm_run</span> { - <span class="kw">unsafe</span> { <span class="kw-2">&</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">*const</span> <span class="ident">kvm_sys::kvm_run</span>) } +<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> <span class="ident">AsMut</span><span class="op"><</span><span class="ident">kvm_sys::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">&mut</span> <span class="self">self</span>) -> <span class="kw-2">&mut</span> <span class="ident">kvm_sys::kvm_run</span> { - <span class="kw">unsafe</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">*mut</span> <span class="ident">kvm_sys::kvm_run</span>) } +<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></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="kvm_rs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.63.0 (4b91a6ea7 2022-08-08)" ></div> -</body></html>
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