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</pre><pre class="rust"><code><span class="doccomment">//! VM 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="ident"><span class="kw">crate</span>::vcpu::Vcpu</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="ident">PhysAddr</span>, <span class="ident">UserMem</span>};
<span class="doccomment">/// Wrapper for VM ioctls.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Representation of the file descriptor obtained by the [`KVM_CREATE_VM`][kvm-create-vm] ioctl.</span>
<span class="doccomment">/// This wrapper provides access to the `VM 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-vm]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-create-vm</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Vm</span> {
<span class="ident">vm</span>: <span class="ident">fs::File</span>,
<span class="ident">vcpu_mmap_size</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span> <span class="ident">Vm</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">vm</span>: <span class="ident">fs::File</span>, <span class="ident">vcpu_mmap_size</span>: <span class="ident">usize</span>) -> <span class="ident">Vm</span> {
<span class="ident">Vm</span> { <span class="ident">vm</span>, <span class="ident">vcpu_mmap_size</span> }
}
<span class="doccomment">/// Map memory from userspace into the VM as `guest physical` memory starting at address</span>
<span class="doccomment">/// `phys_addr`.</span>
<span class="doccomment">/// The underlying operation is the [`KVM_SET_USER_MEMORY_REGION`][kvm-set-user-memory-region]</span>
<span class="doccomment">/// ioctl.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `mem: &UserMem` argument passed to this function must at least live as long the `Vcpu`</span>
<span class="doccomment">/// instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [kvm-set-user-memory-region]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-set-user-memory-region</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">set_user_memory_region</span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">phys_addr</span>: <span class="ident">PhysAddr</span>,
<span class="ident">mem</span>: <span class="kw-2">&</span><span class="ident">UserMem</span>,
) -> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="comment">// Create guest physical memory mapping for `slot : 0` at guest `phys_addr`.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kvm_mem</span> <span class="op">=</span> <span class="ident">kvm_sys::kvm_userspace_memory_region::default</span>();
<span class="ident">kvm_mem</span>.<span class="ident">userspace_addr</span> <span class="op">=</span> <span class="ident">mem</span>.<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">u64</span>;
<span class="ident">kvm_mem</span>.<span class="ident">memory_size</span> <span class="op">=</span> <span class="ident">mem</span>.<span class="ident">len</span> <span class="kw">as</span> <span class="ident">u64</span>;
<span class="ident">kvm_mem</span>.<span class="ident">guest_phys_addr</span> <span class="op">=</span> <span class="ident">phys_addr</span>.<span class="number">0</span>;
<span class="ident">ioctl</span>(
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vm</span>,
<span class="ident">kvm_sys::KVM_SET_USER_MEMORY_REGION</span>,
<span class="kw-2">&</span><span class="ident">kvm_mem</span> <span class="kw">as</span> <span class="kw-2">*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">/// Create a new virtual cpu with the [`KVM_CREATE_VCPU`][kvm-create-vcpu] ioctl.</span>
<span class="doccomment">/// Returns a wrapper [`vcpu::Vcpu`][crate::vcpu::Vcpu] representing the VCPU.</span>
<span class="doccomment">///</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">fn</span> <span class="ident">create_vpcu</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">u64</span>) -> <span class="ident">io::Result</span><span class="op"><</span><span class="ident">Vcpu</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">vcpu</span> <span class="op">=</span> <span class="ident">ioctl</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vm</span>, <span class="ident">kvm_sys::KVM_CREATE_VCPU</span>, <span class="ident">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">kvm_run</span> <span class="op">=</span> <span class="ident">KvmRun::new</span>(<span class="kw-2">&</span><span class="ident">vcpu</span>, <span class="self">self</span>.<span class="ident">vcpu_mmap_size</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">Vcpu::new</span>(<span class="ident">vcpu</span>, <span class="ident">kvm_run</span>))
}
}
</code></pre></div>
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