diff --git a/Cargo.toml b/Cargo.toml
index a7ae5fb..6d09f46 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ repository = "https://github.com/arceos-hypervisor/axvisor_api"
 
 [package]
 name = "axvisor_api"
-version = "0.2.0"
+version = "0.3.0"
 description = "Basic API for components of the Hypervisor on ArceOS"
 documentation = "https://docs.rs/axvisor_api"
 readme = "README.md"
@@ -24,15 +24,18 @@ repository.workspace = true
 [dependencies]
 # === Core Components ===
 # Procedural macro definitions
-axvisor_api_proc = { path = "axvisor_api_proc", version = "0.2.0" }
+axvisor_api_proc = { path = "axvisor_api_proc", version = "0.3.0"}
 
 # === Third-party Libraries ===
 # Address space abstraction
-axaddrspace = "0.1.0"
+axaddrspace = "0.3"
 # Interface definition tools
-crate_interface = "0.2"
+crate_interface = "0.3"
 # Physical/virtual address types
 memory_addr = "0.4"
+# CPU mask
+cpumask = "0.1.0"
+
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/axvisor_api_proc/Cargo.toml b/axvisor_api_proc/Cargo.toml
index 2d05c2b..f6e233f 100644
--- a/axvisor_api_proc/Cargo.toml
+++ b/axvisor_api_proc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "axvisor_api_proc"
-version = "0.2.0"
+version = "0.3.0"
 description = "Procedural macros for the `axvisor_api` crate"
 documentation = "https://docs.rs/axvisor_api_proc"
 readme = "README.md"
diff --git a/src/arch.rs b/src/arch.rs
index 4671b4e..977f639 100644
--- a/src/arch.rs
+++ b/src/arch.rs
@@ -133,4 +133,16 @@ pub trait ArchIf {
     /// later.
     #[cfg(target_arch = "aarch64")]
     fn get_host_gicr_base() -> PhysAddr;
+
+    /// Retrieve the current pending interrupt for the CPU from the physical hardware.
+    #[cfg(target_arch = "aarch64")]
+    fn fetch_irq() -> u64;
+    /// Calls the IRQ handler of the underlying OS to handle a pending interrupt.
+    ///
+    /// TODO: Determine if this function should be exposed in other architectures (and moved to
+    /// `host` module) or remain architecture-specific.
+    ///
+    /// TODO: Consider whether this function should replace `AxVCpuExitReason::ExternalInterrupt`.
+    #[cfg(target_arch = "aarch64")]
+    fn handle_irq();
 }
diff --git a/src/memory.rs b/src/memory.rs
index 49f6033..941807c 100644
--- a/src/memory.rs
+++ b/src/memory.rs
@@ -170,6 +170,7 @@ pub trait MemoryIf {
 /// This struct provides an implementation of the `AxMmHal` trait from the
 /// `axaddrspace` crate, delegating to the axvisor_api memory functions.
 #[doc(hidden)]
+#[derive(Debug)]
 pub struct AxMmHalApiImpl;
 
 impl axaddrspace::AxMmHal for AxMmHalApiImpl {
diff --git a/src/vmm.rs b/src/vmm.rs
index 722f1d5..8de149c 100644
--- a/src/vmm.rs
+++ b/src/vmm.rs
@@ -71,6 +71,12 @@ pub type VCpuId = usize;
 /// Represents the interrupt vector number to be injected into a guest.
 pub type InterruptVector = u8;
 
+/// The maximum number of virtual CPUs supported in a virtual machine.
+pub const MAX_VCPU_NUM: usize = 64;
+
+/// A set of virtual CPUs.
+pub type VCpuSet = cpumask::CpuMask<MAX_VCPU_NUM>;
+
 /// The API trait for virtual machine management functionalities.
 ///
 /// This trait defines the core VM management interface required by the
@@ -78,6 +84,7 @@ pub type InterruptVector = u8;
 /// layer.
 #[crate::api_def]
 pub trait VmmIf {
+    /// Notify that a virtual CPU timer has expired.
     /// Get the identifier of the current virtual machine.
     ///
     /// This function returns the VM ID of the VM that the calling context
@@ -145,6 +152,9 @@ pub trait VmmIf {
     /// ```
     fn inject_interrupt(vm_id: VMId, vcpu_id: VCpuId, vector: InterruptVector);
 
+    /// Inject an interrupt to a set of virtual CPUs.
+    fn inject_interrupt_to_cpus(vm_id: VMId, vcpu_set: VCpuSet, vector: InterruptVector);
+
     /// Notify that a virtual CPU's timer has expired.
     ///
     /// This function is called when a vCPU's virtual timer expires and needs
@@ -162,7 +172,8 @@ pub trait VmmIf {
     fn notify_vcpu_timer_expired(vm_id: VMId, vcpu_id: VCpuId);
 }
 
-/// Get the number of virtual CPUs in the current virtual machine.
+/// Get the number of virtual CPUs in the current virtual machine executing on
+/// the current physical CPU.
 ///
 /// This is a convenience function that combines [`current_vm_id`] and
 /// [`vcpu_num`].
@@ -179,7 +190,8 @@ pub fn current_vm_vcpu_num() -> usize {
     vcpu_num(current_vm_id()).unwrap()
 }
 
-/// Get the bitmask of active virtual CPUs in the current virtual machine.
+/// Get the bitmask of active virtual CPUs in the current virtual machine
+/// executing on the current physical CPU.
 ///
 /// This is a convenience function that combines [`current_vm_id`] and
 /// [`active_vcpus`].