virtio-vhost: Enable handler to be built and tested on Windows

Still need to enable:
 * balloon (try_clone not implemented)
 * console (Need to enable Serial)
 * snd (Unix code not conditionally compiled out)
 * gpu (Waiting for graphics team to upstream)
 * vhost-user block

BUG=b:237011316
TEST=ran "./tools/run_tests --target=host --arch=win64 --verbose"

Change-Id: If2b69250477f88ded7176054196107733736786e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3721868
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Noah Gold <nkgold@google.com>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Commit-Queue: Richard Zhang <rizhang@google.com>

devices/Cargo.toml

@@ -78,6 +78,9 @@ power_monitor = { path = "../power_monitor" }
 usb_util = { path = "../usb_util" }
 vfio_sys = { path = "../vfio_sys" }
 
+[target.'cfg(windows)'.dependencies]
+tube_transporter = { path = "../tube_transporter" }
+
 [dependencies.futures]
 version = "*"
 features = ["async-await", "std"]

devices/src/virtio/vhost/user/device/handler.rs

@@ -127,7 +127,13 @@ pub fn create_guest_memory(
             region.memory_size,
             GuestAddress(region.guest_phys_addr),
             region.mmap_offset,
-            Arc::new(SharedMemory::from_safe_descriptor(SafeDescriptor::from(file), None).unwrap()),
+            Arc::new(
+                SharedMemory::from_safe_descriptor(
+                    SafeDescriptor::from(file),
+                    Some(region.memory_size),
+                )
+                .unwrap(),
+            ),
         )
         .map_err(|e| {
             error!("failed to create a memory region: {}", e);
@@ -753,10 +759,12 @@ mod tests {
         fn stop_queue(&mut self, _idx: usize) {}
     }
 
+    #[cfg(unix)]
     fn temp_dir() -> TempDir {
         Builder::new().prefix("/tmp/vhost_test").tempdir().unwrap()
     }
 
+    #[cfg(unix)]
     #[test]
     fn test_vhost_user_activate() {
         use vmm_vhost::{

devices/src/virtio/vhost/user/device/handler/sys/windows.rs

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-pub(crate) use base::SharedMemoryWindows as SharedMemorySys;
-
 use std::fs::File;
 use std::mem::ManuallyDrop;
 use std::sync::Arc;

devices/src/virtio/vhost/user/device/mod.rs

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+mod handler;
+
 cfg_if::cfg_if! {
     if #[cfg(unix)] {
         mod block;
@@ -11,7 +13,6 @@ cfg_if::cfg_if! {
         #[cfg(feature = "audio_cras")]
         mod cras_snd;
         mod fs;
-        mod handler;
         mod net;
         mod vsock;
         mod vvu;