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</pre></div><pre class="rust"><code><span class="doccomment">//! VCPU system ioctls.
</span><span class="kw">use </span>std::fs;
<span class="kw">use </span>std::io;
<span class="kw">use crate</span>::{ioctl, kvm_sys, KvmRun};
<span class="doccomment">/// Exit reasons for the [`Vcpu::run`][crate::vcpu::Vcpu::run] function.
///
/// Details for the different exit reasons can be found in the [`kvm_run`
/// structure][kvm-run-struct] description.
///
/// [kvm-run]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-run
/// [kvm-run-struct]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#the-kvm-run-structure
</span><span class="kw">pub enum </span>KvmExit<<span class="lifetime">'cpu</span>> {
Halt,
IoIn(u16, <span class="kw-2">&</span><span class="lifetime">'cpu </span><span class="kw-2">mut </span>[u8]),
IoOut(u16, <span class="kw-2">&</span><span class="lifetime">'cpu </span>[u8]),
MmioRead(u64, <span class="kw-2">&</span><span class="lifetime">'cpu </span><span class="kw-2">mut </span>[u8]),
MmioWrite(u64, <span class="kw-2">&</span><span class="lifetime">'cpu </span>[u8]),
Debug(u64),
}
<span class="doccomment">/// Wrapper for VCPU ioctls.
///
/// Representation of the file descriptor obtained by the [`KVM_CREATE_VCPU`][kvm-create-vcpu] ioctl.
/// This wrapper provides access to the `VCPU ioctls` as described in [KVM API][kvm].
///
/// [kvm]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#general-description
/// [kvm-create-vcpu]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-create-vcpu
</span><span class="kw">pub struct </span>Vcpu {
vcpu: fs::File,
kvm_run: KvmRun,
}
<span class="kw">impl </span>Vcpu {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(vcpu: fs::File, kvm_run: KvmRun) -> Vcpu {
Vcpu { vcpu, kvm_run }
}
<span class="doccomment">/// Get the general purpose registers with the [`KVM_GET_REGS`][kvm-get-regs] ioctl in form of
/// [`kvm_regs`](crate::kvm_sys::kvm_regs).
///
/// [kvm-get-regs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-get-regs
</span><span class="kw">pub fn </span>get_regs(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<kvm_sys::kvm_regs> {
<span class="kw">let </span><span class="kw-2">mut </span>regs = kvm_sys::kvm_regs::default();
ioctl(
<span class="kw-2">&</span><span class="self">self</span>.vcpu,
kvm_sys::KVM_GET_REGS,
<span class="kw-2">&mut </span>regs <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span>u64,
)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(regs)
}
<span class="doccomment">/// Set the general purpose registers with the [`KVM_SET_REGS`][kvm-set-regs] ioctl in form of
/// [`kvm_regs`](crate::kvm_sys::kvm_regs).
///
/// [kvm-set-regs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-set-regs
</span><span class="kw">pub fn </span>set_regs(<span class="kw-2">&</span><span class="self">self</span>, regs: kvm_sys::kvm_regs) -> io::Result<()> {
ioctl(<span class="kw-2">&</span><span class="self">self</span>.vcpu, kvm_sys::KVM_SET_REGS, <span class="kw-2">&</span>regs <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">/// Get the special registers with the [`KVM_GET_SREGS`][kvm-get-sregs] ioctl in form of
/// [`kvm_sregs`](crate::kvm_sys::kvm_sregs).
///
/// [kvm-get-sregs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-get-sregs
</span><span class="kw">pub fn </span>get_sregs(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<kvm_sys::kvm_sregs> {
<span class="kw">let </span><span class="kw-2">mut </span>sregs = kvm_sys::kvm_sregs::default();
ioctl(
<span class="kw-2">&</span><span class="self">self</span>.vcpu,
kvm_sys::KVM_GET_SREGS,
<span class="kw-2">&mut </span>sregs <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span>u64,
)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(sregs)
}
<span class="doccomment">/// Set the special registers with the [`KVM_SET_SREGS`][kvm-set-sregs] ioctl in form of
/// [`kvm_sregs`](crate::kvm_sys::kvm_sregs).
///
/// [kvm-set-sregs]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-set-sregs
</span><span class="kw">pub fn </span>set_sregs(<span class="kw-2">&</span><span class="self">self</span>, sregs: kvm_sys::kvm_sregs) -> io::Result<()> {
ioctl(
<span class="kw-2">&</span><span class="self">self</span>.vcpu,
kvm_sys::KVM_SET_SREGS,
<span class="kw-2">&</span>sregs <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">/// Get the debug registers with the [`KVM_GET_DEBUGREGS`][kvm-get-debugregs] ioctl in form of
/// [`kvm_debugregs`](crate::kvm_sys::kvm_debugregs).
///
/// [kvm-get-debugregs]:
/// https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-get-debugregs
</span><span class="attr">#[cfg(target_arch = <span class="string">"x86_64"</span>)]
</span><span class="kw">pub fn </span>get_debugregs(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<kvm_sys::kvm_debugregs> {
<span class="kw">let </span><span class="kw-2">mut </span>dregs = kvm_sys::kvm_debugregs::default();
ioctl(
<span class="kw-2">&</span><span class="self">self</span>.vcpu,
kvm_sys::KVM_GET_DEBUGREGS,
<span class="kw-2">&mut </span>dregs <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span>u64,
)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(dregs)
}
<span class="doccomment">/// Set the debug registers with the [`KVM_SET_DEBUGREGS`][kvm-set-debugregs] ioctl in form of
/// [`kvm_debugregs`](crate::kvm_sys::kvm_debugregs).
///
/// [kvm-set-debugregs]:
/// https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-set-debugregs
</span><span class="attr">#[cfg(target_arch = <span class="string">"x86_64"</span>)]
</span><span class="kw">pub fn </span>set_debugregs(<span class="kw-2">&</span><span class="self">self</span>, dregs: kvm_sys::kvm_debugregs) -> io::Result<()> {
ioctl(
<span class="kw-2">&</span><span class="self">self</span>.vcpu,
kvm_sys::KVM_SET_DEBUGREGS,
<span class="kw-2">&</span>dregs <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">/// Enable or disable guest single steppig (debug) with the
/// [`KVM_GUESTDBG_ENABLE`][kvm-guest-debug] ioctl.
///
/// [kvm-guest-debug]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-set-guest-debug
</span><span class="attr">#[cfg(target_arch = <span class="string">"x86_64"</span>)]
</span><span class="kw">pub fn </span>set_single_step(<span class="kw-2">&</span><span class="self">self</span>, enable: bool) -> io::Result<()> {
<span class="kw">let </span><span class="kw-2">mut </span>dbg = kvm_sys::kvm_guest_debug::default();
<span class="kw">if </span>enable {
<span class="comment">// Enable guest debugging and single stepping.
</span>dbg.control = kvm_sys::KVM_GUESTDBG_ENABLE | kvm_sys::KVM_GUESTDBG_SINGLESTEP;
}
<span class="comment">// Initialize debug registers based on current VCPUs debug register values.
</span><span class="kw">let </span>dregs = <span class="self">self</span>.get_debugregs()<span class="question-mark">?</span>;
dbg.arch.debugreg[<span class="number">0</span>..<span class="number">4</span>].copy_from_slice(<span class="kw-2">&</span>dregs.db);
<span class="comment">// DR4-DR5 are reserved.
</span>dbg.arch.debugreg[<span class="number">6</span>] = dregs.dr6;
dbg.arch.debugreg[<span class="number">7</span>] = dregs.dr7;
ioctl(
<span class="kw-2">&</span><span class="self">self</span>.vcpu,
kvm_sys::KVM_SET_GUEST_DEBUG,
<span class="kw-2">&</span>dbg <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">/// Run the guest VCPU with the [`KVM_RUN`][kvm-run] ioctl until it exits with one of the exit
/// reasons described in [`KvmExit`](crate::vcpu::KvmExit).
///
/// [kvm-run]: https://www.kernel.org/doc/html/latest/virt/kvm/api.html#kvm-run
</span><span class="kw">pub fn </span>run(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<KvmExit<<span class="lifetime">'_</span>>> {
ioctl(<span class="kw-2">&</span><span class="self">self</span>.vcpu, kvm_sys::KVM_RUN, <span class="number">0</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>kvm_run = <span class="self">self</span>.kvm_run.as_mut();
<span class="kw">match </span>kvm_run.exit_reason <span class="kw">as </span>u64 {
kvm_sys::KVM_EXIT_HLT => <span class="prelude-val">Ok</span>(KvmExit::Halt),
kvm_sys::KVM_EXIT_IO => {
<span class="comment">// Safe to use union `io` field, as Kernel instructed us to.
</span><span class="kw">let </span>io = <span class="kw">unsafe </span>{ kvm_run.inner.io };
<span class="kw">let </span>kvm_run_ptr = kvm_run <span class="kw">as </span><span class="kw-2">*mut </span>kvm_sys::kvm_run <span class="kw">as </span><span class="kw-2">*mut </span>u8;
<span class="comment">// Create IO buffer located at `kvm_run + io.offset`.
</span><span class="kw">let </span>data = <span class="kw">unsafe </span>{
std::slice::from_raw_parts_mut(
kvm_run_ptr.offset(io.data_offset <span class="kw">as </span>isize),
io.count <span class="comment">/* num blocks */ </span><span class="kw">as </span>usize * io.size <span class="comment">/* bytes per block */ </span><span class="kw">as </span>usize,
)
};
<span class="kw">match </span>io.direction <span class="kw">as </span>u64 {
kvm_sys::KVM_EXIT_IO_IN => <span class="prelude-val">Ok</span>(KvmExit::IoIn(io.port, data)),
kvm_sys::KVM_EXIT_IO_OUT => <span class="prelude-val">Ok</span>(KvmExit::IoOut(io.port, data)),
<span class="kw">_ </span>=> <span class="macro">unreachable!</span>(),
}
}
kvm_sys::KVM_EXIT_MMIO => {
<span class="comment">// Safe to use union `mmio` filed, as Kernel instructed us to.
</span><span class="kw">let </span>mmio = <span class="kw">unsafe </span>{ <span class="kw-2">&mut </span>kvm_run.inner.mmio };
<span class="kw">let </span>len = mmio.len <span class="kw">as </span>usize;
<span class="kw">match </span>mmio.is_write {
<span class="number">0 </span>=> <span class="prelude-val">Ok</span>(KvmExit::MmioRead(mmio.phys_addr, <span class="kw-2">&mut </span>mmio.data[..len])),
<span class="number">1 </span>=> <span class="prelude-val">Ok</span>(KvmExit::MmioWrite(mmio.phys_addr, <span class="kw-2">&</span>mmio.data[..len])),
<span class="kw">_ </span>=> <span class="macro">unreachable!</span>(),
}
}
kvm_sys::KVM_EXIT_DEBUG => {
<span class="comment">// Safe to use union `debug` field, as Kernel instructed us to.
</span><span class="kw">let </span>debug = <span class="kw">unsafe </span>{ kvm_run.inner.debug };
<span class="prelude-val">Ok</span>(KvmExit::Debug(debug.pc))
}
r @ <span class="kw">_ </span>=> {
<span class="macro">todo!</span>(<span class="string">"KVM_EXIT_... (exit_reason={}) not implemented!"</span>, r)
}
}
}
}
</code></pre></div></section></main></body></html>
