refactor: load kernel/initrd after create_vmm_and_vcpus()

This is in preparation of guest memory itself only getting set up after
the call to create_vmm_and_vcpus().

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

src/vmm/src/builder.rs

@@ -238,8 +238,6 @@ pub fn build_microvm_for_boot(
         .allocate_guest_memory()
         .map_err(StartMicrovmError::GuestMemory)?;
 
-    let entry_point = load_kernel(boot_config, &guest_memory)?;
-    let initrd = load_initrd_from_config(boot_config, &guest_memory)?;
     // Clone the command-line so that a failed boot doesn't pollute the original.
     #[allow(unused_mut)]
     let mut boot_cmdline = boot_config.cmdline.clone();
@@ -258,6 +256,9 @@ pub fn build_microvm_for_boot(
         cpu_template.kvm_capabilities.clone(),
     )?;
 
+    let entry_point = load_kernel(boot_config, vmm.guest_memory())?;
+    let initrd = load_initrd_from_config(boot_config, vmm.guest_memory())?;
+
     #[cfg(feature = "gdb")]
     let (gdb_tx, gdb_rx) = mpsc::channel();
     #[cfg(feature = "gdb")]