[whp] Remove initial_memory_setup_done, which is no longer used

whp can now map any region as long as it contains a file
handle (which, presently, only snapshot and scratch regions do---not
user-provided regions).

Signed-off-by: Lucy Menon <168595099+syntactically@users.noreply.github.com>

Author: syntactically

src/hyperlight_host/src/hypervisor/hyperlight_vm.rs

@@ -367,10 +367,6 @@ impl HyperlightVm {
             };
         }
 
-        // Mark initial setup as complete for Windows - subsequent map_memory calls will fail
-        #[cfg(target_os = "windows")]
-        vm.complete_initial_memory_setup();
-
         #[cfg(feature = "init-paging")]
         vm.set_sregs(&CommonSpecialRegisters::standard_64bit_defaults(_pml4_addr))
             .map_err(VmError::Register)?;

src/hyperlight_host/src/hypervisor/virtual_machine/mod.rs

@@ -324,11 +324,6 @@ pub(crate) trait VirtualMachine: Debug + Send {
     /// Get partition handle
     #[cfg(target_os = "windows")]
     fn partition_handle(&self) -> windows::Win32::System::Hypervisor::WHV_PARTITION_HANDLE;
-
-    /// Mark that initial memory setup is complete. After this, map_memory will fail.
-    /// This is only needed on Windows where dynamic memory mapping is not yet supported.
-    #[cfg(target_os = "windows")]
-    fn complete_initial_memory_setup(&mut self);
 }
 
 #[cfg(test)]

src/hyperlight_host/src/hypervisor/virtual_machine/whp.rs

@@ -69,10 +69,6 @@ pub(crate) struct WhpVm {
     partition: WHV_PARTITION_HANDLE,
     // Surrogate process for memory mapping
     surrogate_process: SurrogateProcess,
-    // Track if initial memory setup is complete.
-    // Used to reject later memory mapping since it's not supported  on windows.
-    // TODO remove this flag once memory mapping is supported on windows.
-    initial_memory_setup_done: bool,
 }
 
 // Safety: `WhpVm` is !Send because it holds `SurrogateProcess` which contains a raw pointer
@@ -111,7 +107,6 @@ impl WhpVm {
         Ok(WhpVm {
             partition,
             surrogate_process,
-            initial_memory_setup_done: false,
         })
     }
 
@@ -505,11 +500,6 @@ impl VirtualMachine for WhpVm {
         Ok(xsave_buffer)
     }
 
-    /// Mark that initial memory setup is complete. After this, map_memory will fail.
-    fn complete_initial_memory_setup(&mut self) {
-        self.initial_memory_setup_done = true;
-    }
-
     /// Get the partition handle for this VM
     fn partition_handle(&self) -> WHV_PARTITION_HANDLE {
         self.partition