Add access method VcpuFd::vcpu_file()

Add access method VcpuFd::vcpu_file() and also export new_vmfd().

Signed-off-by: Liu Jiang <gerry@linux.alibaba.com>

Author: jiangliu

src/ioctls/vcpu.rs

@@ -1394,6 +1394,11 @@ impl VcpuFd {
             Ok(())
         }
     }
+
+    /// Get reference to the underlying vcpu file object.
+    pub fn vcpu_file(&self) -> &File {
+        &self.vcpu
+    }
 }
 
 /// Helper function to create a new `VcpuFd`.

src/lib.rs

@@ -222,7 +222,7 @@ pub use cap::Cap;
 pub use ioctls::device::DeviceFd;
 pub use ioctls::system::Kvm;
 pub use ioctls::vcpu::{VcpuExit, VcpuFd};
-pub use ioctls::vm::{IoEventAddress, NoDatamatch, VmFd};
+pub use ioctls::vm::{new_vmfd, IoEventAddress, NoDatamatch, VmFd};
 // The following example is used to verify that our public
 // structures are exported properly.
 /// # Example