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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! VCPU 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="kw">crate</span>::{<span class="ident">ioctl</span>, <span class="ident">kvm_sys</span>, <span class="ident">KvmRun</span>};
<span class="doccomment">/// Exit reasons for the [`Vcpu::kvm_run`][crate::vcpu::Vcpu::kvm_run] function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Details for the different exit reasons can be found in the [`kvm_run`</span>
<span class="doccomment">/// structure][kvm-run-struct] description.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-run]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-run</span>
<span class="doccomment">/// [kvm-run-struct]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#the-kvm-run-structure</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">KvmExit</span><span class="op"><</span><span class="lifetime">'cpu</span><span class="op">></span> {
<span class="ident">Halt</span>,
<span class="ident">IoIn</span>(<span class="ident">u16</span>, <span class="kw-2">&</span><span class="lifetime">'cpu</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]),
<span class="ident">IoOut</span>(<span class="ident">u16</span>, <span class="kw-2">&</span><span class="lifetime">'cpu</span> [<span class="ident">u8</span>]),
<span class="ident">MmioRead</span>(<span class="ident">u64</span>, <span class="kw-2">&</span><span class="lifetime">'cpu</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]),
<span class="ident">MmioWrite</span>(<span class="ident">u64</span>, <span class="kw-2">&</span><span class="lifetime">'cpu</span> [<span class="ident">u8</span>]),
}
<span class="doccomment">/// Wrapper for VCPU ioctls.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Representation of the file descriptor obtained by the [`KVM_CREATE_VCPU`][kvm-create-vcpu] ioctl.</span>
<span class="doccomment">/// This wrapper provides access to the `VCPU 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="doccomment">/// [kvm-create-vcpu]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-create-vcpu</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Vcpu</span> {
<span class="ident">vcpu</span>: <span class="ident">fs::File</span>,
<span class="ident">kvm_run</span>: <span class="ident">KvmRun</span>,
}
<span class="kw">impl</span> <span class="ident">Vcpu</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">vcpu</span>: <span class="ident">fs::File</span>, <span class="ident">kvm_run</span>: <span class="ident">KvmRun</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vcpu</span> {
<span class="ident">Vcpu</span> { <span class="ident">vcpu</span>, <span class="ident">kvm_run</span> }
}
<span class="doccomment">/// Get the general purpose registers with the [`KVM_GET_REGS`][kvm-get-regs] ioctl in form of</span>
<span class="doccomment">/// [`kvm_regs`](crate::kvm_sys::kvm_regs).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-get-regs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-get-regs</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_regs</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">kvm_sys::kvm_regs</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">regs</span> <span class="op">=</span> <span class="ident">kvm_sys::kvm_regs::default</span>();
<span class="ident">ioctl</span>(
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vcpu</span>,
<span class="ident">kvm_sys::KVM_GET_REGS</span>,
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">regs</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="ident">u64</span>,
)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">regs</span>)
}
<span class="doccomment">/// Set the general purpose registers with the [`KVM_SET_REGS`][kvm-set-regs] ioctl in form of</span>
<span class="doccomment">/// [`kvm_regs`](crate::kvm_sys::kvm_regs).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-set-regs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-set-regs</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_regs</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">regs</span>: <span class="ident">kvm_sys::kvm_regs</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vcpu</span>, <span class="ident">kvm_sys::KVM_SET_REGS</span>, <span class="kw-2">&</span><span class="ident">regs</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> <span class="kw">as</span> <span class="ident">u64</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="doccomment">/// Get the special registers with the [`KVM_GET_SREGS`][kvm-get-sregs] ioctl in form of</span>
<span class="doccomment">/// [`kvm_sregs`](crate::kvm_sys::kvm_sregs).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-get-sregs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-get-sregs</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_sregs</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">kvm_sys::kvm_sregs</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sregs</span> <span class="op">=</span> <span class="ident">kvm_sys::kvm_sregs::default</span>();
<span class="ident">ioctl</span>(
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vcpu</span>,
<span class="ident">kvm_sys::KVM_GET_SREGS</span>,
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">sregs</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="ident">u64</span>,
)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">sregs</span>)
}
<span class="doccomment">/// Set the special registers with the [`KVM_SET_SREGS`][kvm-set-sregs] ioctl in form of</span>
<span class="doccomment">/// [`kvm_sregs`](crate::kvm_sys::kvm_sregs).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-set-sregs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-set-sregs</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_sregs</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">sregs</span>: <span class="ident">kvm_sys::kvm_sregs</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="ident">ioctl</span>(
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vcpu</span>,
<span class="ident">kvm_sys::KVM_SET_SREGS</span>,
<span class="kw-2">&</span><span class="ident">sregs</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> <span class="kw">as</span> <span class="ident">u64</span>,
)
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="doccomment">/// Run the guest VCPU with the [`KVM_RUN`][kvm-run] ioctl until it exits with one of the exit</span>
<span class="doccomment">/// reasons described in [`KvmExit`](crate::vcpu::KvmExit).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-run]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-run</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">run</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="ident">io::Result</span><span class="op"><</span><span class="ident">KvmExit</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span><span class="op">></span> {
<span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vcpu</span>, <span class="ident">kvm_sys::KVM_RUN</span>, <span class="number">0</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">kvm_run</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">kvm_run</span>.<span class="ident">as_mut</span>();
<span class="kw">match</span> <span class="ident">kvm_run</span>.<span class="ident">exit_reason</span> <span class="kw">as</span> <span class="ident">u64</span> {
<span class="ident">kvm_sys::KVM_EXIT_HLT</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">KvmExit::Halt</span>),
<span class="ident">kvm_sys::KVM_EXIT_IO</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// Safe to use union `io` field, as Kernel instructed us to.</span>
<span class="kw">let</span> <span class="ident">io</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">kvm_run</span>.<span class="ident">inner</span>.<span class="ident">io</span> };
<span class="kw">let</span> <span class="ident">kvm_run_ptr</span> <span class="op">=</span> <span class="ident">kvm_run</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">kvm_sys::kvm_run</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>;
<span class="comment">// Create IO buffer located at `kvm_run + io.offset`.</span>
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">std::slice::from_raw_parts_mut</span>(
<span class="ident">kvm_run_ptr</span>.<span class="ident">offset</span>(<span class="ident">io</span>.<span class="ident">data_offset</span> <span class="kw">as</span> <span class="ident">isize</span>),
<span class="ident">io</span>.<span class="ident">count</span> <span class="comment">/* num blocks */</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">io</span>.<span class="ident">size</span> <span class="comment">/* bytes per block */</span> <span class="kw">as</span> <span class="ident">usize</span>,
)
};
<span class="kw">match</span> <span class="ident">io</span>.<span class="ident">direction</span> <span class="kw">as</span> <span class="ident">u64</span> {
<span class="ident">kvm_sys::KVM_EXIT_IO_IN</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">KvmExit::IoIn</span>(<span class="ident">io</span>.<span class="ident">port</span>, <span class="ident">data</span>)),
<span class="ident">kvm_sys::KVM_EXIT_IO_OUT</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">KvmExit::IoOut</span>(<span class="ident">io</span>.<span class="ident">port</span>, <span class="ident">data</span>)),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">unreachable!</span>(),
}
}
<span class="ident">kvm_sys::KVM_EXIT_MMIO</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// Safe to use union `mmio` filed, as Kernel instructed us to.</span>
<span class="kw">let</span> <span class="ident">mmio</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">kvm_run</span>.<span class="ident">inner</span>.<span class="ident">mmio</span> };
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">mmio</span>.<span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">match</span> <span class="ident">mmio</span>.<span class="ident">is_write</span> {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">KvmExit::MmioRead</span>(<span class="ident">mmio</span>.<span class="ident">phys_addr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">mmio</span>.<span class="ident">data</span>[..<span class="ident">len</span>])),
<span class="number">1</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">KvmExit::MmioWrite</span>(<span class="ident">mmio</span>.<span class="ident">phys_addr</span>, <span class="kw-2">&</span><span class="ident">mmio</span>.<span class="ident">data</span>[..<span class="ident">len</span>])),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">unreachable!</span>(),
}
}
<span class="ident">r</span> @ <span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="macro">todo!</span>(<span class="string">"KVM_EXIT_... (exit_reason={}) not implemented!"</span>, <span class="ident">r</span>)
}
}
}
}
</pre></div>
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