diff --git a/virtio-devices/src/iommu.rs b/virtio-devices/src/iommu.rs
index 8219c3475..03968434c 100644
--- a/virtio-devices/src/iommu.rs
+++ b/virtio-devices/src/iommu.rs
@@ -4,7 +4,6 @@
 
 use std::collections::BTreeMap;
 use std::mem::size_of;
-use std::ops::Bound::Included;
 use std::os::unix::io::AsRawFd;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Barrier, Mutex, RwLock};
@@ -811,15 +810,7 @@ impl DmaRemapping for IommuMapping {
                     return Ok(addr);
                 }
 
-                let range_start = if VIRTIO_IOMMU_PAGE_SIZE_MASK > addr {
-                    0
-                } else {
-                    addr - VIRTIO_IOMMU_PAGE_SIZE_MASK
-                };
-                for (&key, &value) in domain
-                    .mappings
-                    .range((Included(&range_start), Included(&addr)))
-                {
+                for (&key, &value) in domain.mappings.iter() {
                     if addr >= key && addr < key + value.size {
                         let new_addr = addr - key + value.gpa;
                         debug!("Into GPA addr 0x{:x}", new_addr);