hypervisor: use memory size during VM creation

For SEV-SNP VM on MSHV we need to request page access during
IO, we want to avoid such request for the page that have already
been requested. In order to maintain the bitmap we need the memory size
during bitmap creation.

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

hypervisor/src/kvm/mod.rs

@@ -1076,6 +1076,26 @@ impl hypervisor::Hypervisor for KvmHypervisor {
         HypervisorType::Kvm
     }
 
+    ///
+    /// Create a Vm of a specific type using the underlying hypervisor, passing memory size
+    /// Return a hypervisor-agnostic Vm trait object
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use hypervisor::kvm::KvmHypervisor;
+    /// use hypervisor::kvm::KvmVm;
+    /// let hypervisor = KvmHypervisor::new().unwrap();
+    /// let vm = hypervisor.create_vm_with_type_and_memory(0).unwrap();
+    /// ```
+    fn create_vm_with_type_and_memory(
+        &self,
+        vm_type: u64,
+        #[cfg(feature = "sev_snp")] _mem_size: u64,
+    ) -> hypervisor::Result<Arc<dyn vm::Vm>> {
+        self.create_vm_with_type(vm_type)
+    }
+
     /// Create a KVM vm object of a specific VM type and return the object as Vm trait object
     ///
     /// # Examples