vmm: Add VM creation and startup helpers

Based on the newly defined Cloud Hypervisor IPC, those helpers send
VmCreate and VmStart requests respectively. This will be used by the
main thread to create and start a VM based on the CLI parameters.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

vmm/src/lib.rs

@@ -213,6 +213,44 @@ pub fn start_vmm_thread(
         .map_err(Error::VmmThreadSpawn)
 }
 
+pub fn vm_create(
+    api_evt: EventFd,
+    api_sender: Sender<ApiRequest>,
+    config: Arc<VmConfig>,
+) -> Result<()> {
+    let (response_sender, response_receiver) = channel();
+
+    // Send the VM creation request.
+    api_sender
+        .send(ApiRequest::VmCreate(config, response_sender))
+        .map_err(Error::ApiRequestSend)?;
+    api_evt.write(1).map_err(Error::EventFdWrite)?;
+
+    response_receiver
+        .recv()
+        .map_err(Error::ApiResponseRecv)?
+        .map_err(Error::ApiVmCreate)?;
+
+    Ok(())
+}
+
+pub fn vm_start(api_evt: EventFd, api_sender: Sender<ApiRequest>) -> Result<()> {
+    let (response_sender, response_receiver) = channel();
+
+    // Send the VM start request.
+    api_sender
+        .send(ApiRequest::VmStart(response_sender))
+        .map_err(Error::ApiRequestSend)?;
+    api_evt.write(1).map_err(Error::EventFdWrite)?;
+
+    response_receiver
+        .recv()
+        .map_err(Error::ApiResponseRecv)?
+        .map_err(Error::ApiVmStart)?;
+
+    Ok(())
+}
+
 pub struct Vmm {
     epoll: EpollContext,
     exit_evt: EventFd,