hypervisor: implement freeze/unfreeze API for MSHV

Implement freeze and unfreeze partition API for MSHV.
Here we set/reset the partition property(TIME_FREEZE)

Signed-off-by: Muminul Islam <muislam@microsoft.com>

hypervisor/src/mshv/mod.rs

@@ -2083,4 +2083,26 @@ impl vm::Vm for MshvVm {
     fn get_preferred_target(&self, kvi: &mut VcpuInit) -> vm::Result<()> {
         unimplemented!()
     }
+
+    /// Freeze the Partiton/VM
+    #[cfg(feature = "mshv")]
+    fn freeze_vm(&self) -> vm::Result<()> {
+        self.fd
+            .set_partition_property(
+                hv_partition_property_code_HV_PARTITION_PROPERTY_TIME_FREEZE,
+                1u64,
+            )
+            .map_err(|e| vm::HypervisorVmError::SetPartitionProperty(e.into()))
+    }
+
+    /// Unfreeze the Partiton/VM
+    #[cfg(feature = "mshv")]
+    fn unfreeze_vm(&self) -> vm::Result<()> {
+        self.fd
+            .set_partition_property(
+                hv_partition_property_code_HV_PARTITION_PROPERTY_TIME_FREEZE,
+                0u64,
+            )
+            .map_err(|e| vm::HypervisorVmError::SetPartitionProperty(e.into()))
+    }
 }

hypervisor/src/vm.rs

@@ -231,6 +231,11 @@ pub enum HypervisorVmError {
     ///
     #[error("Failed to complete isolated import: {0}")]
     CompleteIsolatedImport(#[source] anyhow::Error),
+    #[cfg(feature = "mshv")]
+    /// Failed to set partition property
+    ///
+    #[error("Failed to set partition property: {0}")]
+    SetPartitionProperty(#[source] anyhow::Error),
 }
 ///
 /// Result type for returning from a function