virtio: Enable build and tests for some virtio mods

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 and handler

The vhost mod is also being built now, but the vhost devices that don't
build on Windows have been disabled.

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

Change-Id: I3d06a9d49b4bdae14dea47fcfa030834b55925ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3723797
Reviewed-by: Vikram Auradkar <auradkar@google.com>
Reviewed-by: Noah Gold <nkgold@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Richard Zhang <rizhang@google.com>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>

devices/src/virtio/mod.rs

@@ -4,67 +4,73 @@
 
 //! Implements virtio devices, queues, and transport mechanisms.
 
+mod async_device;
 mod async_utils;
 mod descriptor_utils;
+mod input;
 mod interrupt;
 mod iommu;
 mod queue;
+mod rng;
+#[cfg(feature = "tpm")]
+mod tpm;
+#[cfg(any(feature = "video-decoder", feature = "video-encoder"))]
+mod video;
 mod virtio_device;
+mod virtio_pci_common_config;
+mod virtio_pci_device;
+
+pub mod block;
+pub mod resource_bridge;
+pub mod vhost;
+
+pub use self::block::*;
 pub use self::descriptor_utils::Error as DescriptorError;
 pub use self::descriptor_utils::*;
+pub use self::input::*;
 pub use self::interrupt::*;
 pub use self::iommu::*;
 pub use self::queue::*;
+pub use self::rng::*;
+#[cfg(feature = "tpm")]
+pub use self::tpm::*;
+#[cfg(any(feature = "video-decoder", feature = "video-encoder"))]
+pub use self::video::*;
 pub use self::virtio_device::*;
+pub use self::virtio_pci_device::*;
 cfg_if::cfg_if! {
     if #[cfg(unix)] {
-        mod async_device;
         mod balloon;
-        mod input;
         mod p9;
         mod pmem;
-        mod rng;
-        #[cfg(feature = "tpm")]
-        mod tpm;
-        #[cfg(any(feature = "video-decoder", feature = "video-encoder"))]
-        mod video;
-        mod virtio_pci_common_config;
-        mod virtio_pci_device;
         pub mod wl;
 
-        pub mod block;
         pub mod console;
         pub mod fs;
         #[cfg(feature = "gpu")]
         pub mod gpu;
         pub mod net;
-        pub mod resource_bridge;
         #[cfg(feature = "audio")]
         pub mod snd;
-        pub mod vhost;
 
         pub use self::balloon::*;
-        pub use self::block::*;
         pub use self::console::*;
         #[cfg(feature = "gpu")]
         pub use self::gpu::*;
-        pub use self::input::*;
-        #[cfg(unix)]
         pub use self::iommu::sys::unix::vfio_wrapper;
         pub use self::net::*;
         pub use self::p9::*;
         pub use self::pmem::*;
-        pub use self::rng::*;
         #[cfg(feature = "audio")]
         pub use self::snd::*;
-        #[cfg(feature = "tpm")]
-        pub use self::tpm::*;
-        #[cfg(any(feature = "video-decoder", feature = "video-encoder"))]
-        pub use self::video::*;
-        pub use self::virtio_pci_device::*;
         pub use self::wl::*;
 
     } else if #[cfg(windows)] {
+        #[cfg(feature = "slirp")]
+        pub mod net;
+
+        #[cfg(feature = "slirp")]
+        pub use self::net::*;
     } else {
         compile_error!("Unsupported platform");
     }

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

@@ -2,24 +2,22 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-mod block;
-mod handler;
-
-pub use block::{run_block_device, Options as BlockOptions};
-
 cfg_if::cfg_if! {
     if #[cfg(unix)] {
+        mod block;
         #[cfg(feature = "gpu")]
         mod gpu;
         mod console;
         #[cfg(feature = "audio_cras")]
         mod cras_snd;
         mod fs;
+        mod handler;
         mod net;
         mod vsock;
         mod vvu;
         mod wl;
 
+        pub use block::{run_block_device, Options as BlockOptions};
         pub use vsock::{run_vsock_device, Options as VsockOptions};
         pub use wl::{run_wl_device, parse_wayland_sock, Options as WlOptions};
         pub use console::{run_console_device, Options as ConsoleOptions};