Update dependencies and switch to caret versions

Update libc, log, vhost, virtio-queue and vm-memory
dependencies. Also, take this opportunity to specify the dependencies
with caret versions.

Switching to a newer vhost required some small changes to accommodate
the fact that VhostUserError::InvalidOperation now requires an
argument.

Signed-off-by: Sergio Lopez <slp@redhat.com>

Author: slp

Cargo.toml

@@ -8,16 +8,16 @@ edition = "2018"
 license = "Apache-2.0"
 
 [dependencies]
-libc = ">=0.2.39"
-log = ">=0.4.6"
-vhost = { version = "0.4", features = ["vhost-user-slave"] }
+libc = "0.2.39"
+log = "0.4.17"
+vhost = { version = "0.5", features = ["vhost-user-slave"] }
 virtio-bindings = "0.1"
-virtio-queue = "0.5.0"
-vm-memory = {version = ">=0.7", features = ["backend-mmap", "backend-atomic"]}
+virtio-queue = "0.6"
+vm-memory = { version = "0.9", features = ["backend-mmap", "backend-atomic"] }
 vmm-sys-util = "0.10"
 
 [dev-dependencies]
 nix = "0.25"
-vhost = { version = "0.4", features = ["vhost-user-master", "vhost-user-slave"] }
-vm-memory = {version = ">=0.7", features = ["backend-mmap", "backend-atomic", "backend-bitmap"]}
+vhost = { version = "0.5", features = ["vhost-user-master", "vhost-user-slave"] }
+vm-memory = { version = "0.9", features = ["backend-mmap", "backend-atomic", "backend-bitmap"] }
 tempfile = "3.2.0"

src/handler.rs

@@ -220,7 +220,7 @@ where
 {
     fn set_owner(&mut self) -> VhostUserResult<()> {
         if self.owned {
-            return Err(VhostUserError::InvalidOperation);
+            return Err(VhostUserError::InvalidOperation("already claimed"));
         }
         self.owned = true;
         Ok(())
@@ -456,7 +456,9 @@ where
         // This request should be handled only when VHOST_USER_F_PROTOCOL_FEATURES
         // has been negotiated.
         if self.acked_features & VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits() == 0 {
-            return Err(VhostUserError::InvalidOperation);
+            return Err(VhostUserError::InvalidOperation(
+                "protocol features not set",
+            ));
         } else if index as usize >= self.num_queues {
             return Err(VhostUserError::InvalidParam);
         }
@@ -505,15 +507,15 @@ where
         // Assume the backend hasn't negotiated the inflight feature; it
         // wouldn't be correct for the backend to do so, as we don't (yet)
         // provide a way for it to handle such requests.
-        Err(VhostUserError::InvalidOperation)
+        Err(VhostUserError::InvalidOperation("not supported"))
     }
 
     fn set_inflight_fd(
         &mut self,
         _inflight: &vhost::vhost_user::message::VhostUserInflight,
         _file: File,
     ) -> VhostUserResult<()> {
-        Err(VhostUserError::InvalidOperation)
+        Err(VhostUserError::InvalidOperation("not supported"))
     }
 
     fn get_max_mem_slots(&mut self) -> VhostUserResult<u64> {