vmm: don't configure system if rsdp is not available

In case of CVM guest rsdp is set to none. Unwrapping it
make the vmm crashed. Don't call configure system if the
rsdb address is none.

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

vmm/src/vm.rs

@@ -2332,15 +2332,16 @@ impl Vm {
         let rsdp_addr = self.create_acpi_tables();
 
         #[cfg(not(target_arch = "riscv64"))]
-        // Configure shared state based on loaded kernel
-        entry_point
-            .map(|entry_point| {
-                // Safe to unwrap rsdp_addr as we know it can't be None when
-                // the entry_point is Some.
-                self.configure_system(rsdp_addr.unwrap(), entry_point)
-            })
-            .transpose()?;
-
+        {
+            #[cfg(not(feature = "sev_snp"))]
+            assert!(rsdp_addr.is_some());
+            // Configure shared state based on loaded kernel
+            if let Some(rsdp_adr) = rsdp_addr {
+                entry_point
+                    .map(|entry_point| self.configure_system(rsdp_adr, entry_point))
+                    .transpose()?;
+            }
+        }
         #[cfg(target_arch = "riscv64")]
         self.configure_system().unwrap();