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</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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