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