vmm: Remove balloon options from --memory parameter

The standalone `--balloon` parameter being fully functional at this
point, we can get rid of the balloon options from the --memory
parameter.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

docs/memory.md

@@ -18,14 +18,12 @@ struct MemoryConfig {
     hotplug_method: HotplugMethod,
     hotplug_size: Option<u64>,
     hotplugged_size: Option<u64>,
-    balloon: bool,
-    balloon_size: u64,
     zones: Option<Vec<MemoryZoneConfig>>,
 }
 ```
 
 ```
---memory <memory>	Memory parameters "size=<guest_memory_size>,mergeable=on|off,shared=on|off,hugepages=on|off,hotplug_method=acpi|virtio-mem,hotplug_size=<hotpluggable_memory_size>,hotplugged_size=<hotplugged_memory_size>,balloon=on|off"
+--memory <memory>	Memory parameters "size=<guest_memory_size>,mergeable=on|off,shared=on|off,hugepages=on|off,hotplug_method=acpi|virtio-mem,hotplug_size=<hotpluggable_memory_size>,hotplugged_size=<hotplugged_memory_size>"
 ```
 
 ### `size`
@@ -142,20 +140,6 @@ _Example_
 --memory size=1G,hotplug_method=virtio-mem,hotplug_size=1G,hotplugged_size=512M
 ```
 
-### `balloon`
-
-Specifies if the `virtio-balloon` device must be activated. This creates a
-dedicated virtio device for managing the balloon in the guest, which allows
-guest to access more or less memory depending on the balloon size.
-
-By default this option is turned off.
-
-_Example_
-
-```
---memory size=1G,balloon=on
-```
-
 ## Advanced Parameters
 
 `MemoryZoneConfig` or what is known as `--memory-zone` from the CLI perspective

src/main.rs

@@ -111,8 +111,7 @@ fn create_app<'a, 'b>(
                      \"size=<guest_memory_size>,mergeable=on|off,shared=on|off,hugepages=on|off,\
                      hotplug_method=acpi|virtio-mem,\
                      hotplug_size=<hotpluggable_memory_size>,\
-                     hotplugged_size=<hotplugged_memory_size>,\
-                     balloon=on|off\"",
+                     hotplugged_size=<hotplugged_memory_size>\"",
                 )
                 .default_value(&default_memory)
                 .group("vm-config"),
@@ -572,8 +571,6 @@ mod unit_tests {
                     hotplugged_size: None,
                     shared: false,
                     hugepages: false,
-                    balloon: false,
-                    balloon_size: 0,
                     zones: None,
                 },
                 kernel: Some(KernelConfig {

vmm/src/api/openapi/cloud-hypervisor.yaml

@@ -537,12 +537,6 @@ components:
         hugepages:
           type: boolean
           default: false
-        balloon:
-          type: boolean
-          default: false
-        balloon_size:
-          type: integer
-          format: int64
         zones:
           type: array
           items:
@@ -810,8 +804,8 @@ components:
           description: desired memory ram in bytes
           type: integer
           format: int64
-        desired_ram_w_balloon:
-          description: desired ballon size in bytes
+        desired_balloon:
+          description: desired balloon size in bytes
           type: integer
           format: int64
 

vmm/src/config.rs

@@ -418,10 +418,6 @@ pub struct MemoryConfig {
     #[serde(default)]
     pub hugepages: bool,
     #[serde(default)]
-    pub balloon: bool,
-    #[serde(default)]
-    pub balloon_size: u64,
-    #[serde(default)]
     pub zones: Option<Vec<MemoryZoneConfig>>,
 }
 
@@ -436,8 +432,7 @@ impl MemoryConfig {
             .add("hotplug_size")
             .add("hotplugged_size")
             .add("shared")
-            .add("hugepages")
-            .add("balloon");
+            .add("hugepages");
         parser.parse(memory).map_err(Error::ParseMemory)?;
 
         let size = parser
@@ -472,11 +467,6 @@ impl MemoryConfig {
             .map_err(Error::ParseMemory)?
             .unwrap_or(Toggle(false))
             .0;
-        let balloon = parser
-            .convert::<Toggle>("balloon")
-            .map_err(Error::ParseMemory)?
-            .unwrap_or(Toggle(false))
-            .0;
 
         let zones: Option<Vec<MemoryZoneConfig>> = if let Some(memory_zones) = &memory_zones {
             let mut zones = Vec::new();
@@ -546,8 +536,6 @@ impl MemoryConfig {
             hotplugged_size,
             shared,
             hugepages,
-            balloon,
-            balloon_size: 0,
             zones,
         })
     }
@@ -581,8 +569,6 @@ impl Default for MemoryConfig {
             hotplugged_size: None,
             shared: false,
             hugepages: false,
-            balloon: false,
-            balloon_size: 0,
             zones: None,
         }
     }
@@ -2194,8 +2180,6 @@ mod tests {
                 hotplugged_size: None,
                 shared: false,
                 hugepages: false,
-                balloon: false,
-                balloon_size: 0,
                 zones: None,
             },
             kernel: Some(KernelConfig {