diff --git a/devices/src/pci/vfio_pci.rs b/devices/src/pci/vfio_pci.rs
index 46ee5372b4..11ee0e7d50 100644
--- a/devices/src/pci/vfio_pci.rs
+++ b/devices/src/pci/vfio_pci.rs
@@ -547,9 +547,10 @@ impl VfioPciDevice {
         }
 
         if let Some(ref interrupt_evt) = self.interrupt_evt {
-            let mut fds = Vec::new();
-            fds.push(interrupt_evt);
-            if let Err(e) = self.device.irq_enable(fds, VFIO_PCI_INTX_IRQ_INDEX) {
+            if let Err(e) = self
+                .device
+                .irq_enable(&[interrupt_evt], VFIO_PCI_INTX_IRQ_INDEX)
+            {
                 error!("Intx enable failed: {}", e);
                 return;
             }
@@ -617,9 +618,7 @@ impl VfioPciDevice {
             }
         };
 
-        let mut fds = Vec::new();
-        fds.push(irqfd);
-        if let Err(e) = self.device.irq_enable(fds, VFIO_PCI_MSI_IRQ_INDEX) {
+        if let Err(e) = self.device.irq_enable(&[irqfd], VFIO_PCI_MSI_IRQ_INDEX) {
             error!("failed to enable msi: {}", e);
             self.enable_intx();
             return;
@@ -646,7 +645,10 @@ impl VfioPciDevice {
         };
 
         if let Some(descriptors) = irqfds {
-            if let Err(e) = self.device.irq_enable(descriptors, VFIO_PCI_MSIX_IRQ_INDEX) {
+            if let Err(e) = self
+                .device
+                .irq_enable(&descriptors, VFIO_PCI_MSIX_IRQ_INDEX)
+            {
                 error!("failed to enable msix: {}", e);
                 self.enable_intx();
                 return;
diff --git a/devices/src/vfio.rs b/devices/src/vfio.rs
index 9fda0d65db..9d37af757b 100644
--- a/devices/src/vfio.rs
+++ b/devices/src/vfio.rs
@@ -391,7 +391,7 @@ impl VfioDevice {
     /// Enable vfio device's irq and associate Irqfd Event with device.
     /// When MSIx is enabled, multi vectors will be supported, so descriptors is vector and the vector
     /// length is the num of MSIx vectors
-    pub fn irq_enable(&self, descriptors: Vec<&Event>, index: u32) -> Result<(), VfioError> {
+    pub fn irq_enable(&self, descriptors: &[&Event], index: u32) -> Result<(), VfioError> {
         let count = descriptors.len();
         let u32_size = mem::size_of::<u32>();
         let mut irq_set = vec_with_array_field::<vfio_irq_set, u32>(count);