vmm: Enable memory manager for AArch64

Screened IO space as it is not available on AArch64.

Signed-off-by: Michael Zhao <michael.zhao@arm.com>

vmm/src/cpu.rs

@@ -37,7 +37,9 @@ use std::os::unix::thread::JoinHandleExt;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Barrier, Mutex};
 use std::{cmp, io, result, thread};
-use vm_memory::{GuestAddress, GuestMemoryAtomic, GuestMemoryMmap};
+#[cfg(target_arch = "x86_64")]
+use vm_memory::GuestAddress;
+use vm_memory::{GuestMemoryAtomic, GuestMemoryMmap};
 use vm_migration::{
     Migratable, MigratableError, Pausable, Snapshot, SnapshotDataSection, Snapshottable,
     Transportable,
@@ -675,6 +677,7 @@ impl CpuManager {
             vcpus: Vec::with_capacity(usize::from(config.max_vcpus)),
         }));
 
+        #[cfg(target_arch = "x86_64")]
         device_manager
             .allocator()
             .lock()

vmm/src/memory_manager.rs

@@ -302,8 +302,10 @@ impl MemoryManager {
         // Both MMIO and PIO address spaces start at address 0.
         let allocator = Arc::new(Mutex::new(
             SystemAllocator::new(
+                #[cfg(target_arch = "x86_64")]
                 GuestAddress(0),
-                1 << 16 as GuestUsize,
+                #[cfg(target_arch = "x86_64")]
+                (1 << 16 as GuestUsize),
                 GuestAddress(0),
                 mmio_address_space_size(),
                 layout::MEM_32BIT_DEVICES_START,