gpu: implement virtio-gpu

Basic 2D and 3D support is there. The drm_cursor_test and
null_platform_test in drm-tests should run to completion.

The extra device is hidden behind both a build time feature called 'gpu'
and the device is only added to a VM if the  '--gpu' flag is given.

TEST=build with --features=gpu;
     drm_cursor_test && null_platform_test
BUG=chromium:837073

Change-Id: Ic91acaaebbee395599d7e1ba41c24c9ed2d84169
Reviewed-on: https://chromium-review.googlesource.com/1036862
Commit-Ready: Zach Reizner <zachr@chromium.org>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 1b4fb64..63ad4e0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -82,6 +82,7 @@ pub struct Config {
     multiprocess: bool,
     seccomp_policy_dir: PathBuf,
     cid: Option<u64>,
+    gpu: bool,
     plugin: Option<PathBuf>,
     plugin_root: Option<PathBuf>,
 }
@@ -105,6 +106,7 @@ impl Default for Config {
             multiprocess: !cfg!(feature = "default-no-sandbox"),
             seccomp_policy_dir: PathBuf::from(SECCOMP_POLICY_DIR),
             cid: None,
+            gpu: false,
             plugin: None,
             plugin_root: None,
         }
@@ -351,6 +353,9 @@ fn set_argument(cfg: &mut Config, name: &str, value: Option<&str>) -> argument::
                 }
             })?);
         }
+        "gpu" => {
+            cfg.gpu = true;
+        }
         "help" => return Err(argument::Error::PrintHelp),
         _ => unreachable!(),
     }
@@ -404,6 +409,8 @@ fn run_vm(args: std::env::Args) -> std::result::Result<(), ()> {
           Argument::value("tap-fd",
                           "fd",
                           "File descriptor for configured tap device.  Mutually exclusive with `host_ip`, `netmask`, and `mac`."),
+          #[cfg(feature = "gpu")]
+          Argument::flag("gpu", "(EXPERIMENTAL) enable virtio-gpu device"),
           Argument::short_flag('h', "help", "Print help message.")];
 
     let mut cfg = Config::default();