diff --git a/xencall/src/lib.rs b/xencall/src/lib.rs
index 7338362..74ad89b 100644
--- a/xencall/src/lib.rs
+++ b/xencall/src/lib.rs
@@ -3,7 +3,8 @@ pub mod memory;
 pub mod sys;
 
 use crate::sys::{
-    Hypercall, MmapBatch, XenCapabilitiesInfo, HYPERVISOR_XEN_VERSION, XENVER_CAPABILITIES,
+    Hypercall, MmapBatch, MultiCallEntry, XenCapabilitiesInfo, HYPERVISOR_MULTICALL,
+    HYPERVISOR_XEN_VERSION, XENVER_CAPABILITIES,
 };
 use libc::{mmap, MAP_FAILED, MAP_SHARED, PROT_READ, PROT_WRITE};
 use nix::errno::Errno;
@@ -128,6 +129,15 @@ impl XenCall {
         self.hypercall(op, [arg1, arg2, arg3, arg4, 0])
     }
 
+    pub fn multicall(&self, calls: &mut [MultiCallEntry]) -> Result<(), XenCallError> {
+        self.hypercall2(
+            HYPERVISOR_MULTICALL,
+            calls.as_mut_ptr() as c_ulong,
+            calls.len() as c_ulong,
+        )?;
+        Ok(())
+    }
+
     pub fn hypercall5(
         &self,
         op: c_ulong,
diff --git a/xencall/src/memory.rs b/xencall/src/memory.rs
index 4b35561..506af63 100644
--- a/xencall/src/memory.rs
+++ b/xencall/src/memory.rs
@@ -1,8 +1,11 @@
-use crate::sys::{MemoryReservation, HYPERVISOR_MEMORY_OP, XEN_MEM_POPULATE_PHYSMAP};
+use crate::sys::{
+    MemoryReservation, MultiCallEntry, HYPERVISOR_MEMORY_OP, XEN_MEM_POPULATE_PHYSMAP,
+};
 use crate::{XenCall, XenCallError};
 
 use std::ffi::c_ulong;
 
+use libc::c_long;
 use std::ptr::addr_of_mut;
 
 pub struct MemoryControl<'a> {
@@ -30,12 +33,21 @@ impl MemoryControl<'_> {
             mem_flags,
             domid: domid as u16,
         };
-        let code = self.call.hypercall2(
-            HYPERVISOR_MEMORY_OP,
-            XEN_MEM_POPULATE_PHYSMAP as c_ulong,
-            addr_of_mut!(reservation) as c_ulong,
-        )?;
 
+        let calls = &mut [MultiCallEntry {
+            op: HYPERVISOR_MEMORY_OP,
+            result: 0,
+            args: [
+                XEN_MEM_POPULATE_PHYSMAP as c_ulong,
+                addr_of_mut!(reservation) as c_ulong,
+                0,
+                0,
+                0,
+                0,
+            ],
+        }];
+        self.call.multicall(calls)?;
+        let code = calls[0].result as c_long;
         if code < 0 {
             return Err(XenCallError::new("failed to populate physmap"));
         }
diff --git a/xencall/src/sys.rs b/xencall/src/sys.rs
index 4aab3ca..979ff13 100644
--- a/xencall/src/sys.rs
+++ b/xencall/src/sys.rs
@@ -318,4 +318,12 @@ pub struct MemoryReservation {
     pub domid: u16,
 }
 
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct MultiCallEntry {
+    pub op: c_ulong,
+    pub result: c_ulong,
+    pub args: [c_ulong; 6],
+}
+
 pub const XEN_MEM_POPULATE_PHYSMAP: u32 = 6;
diff --git a/xenclient/src/boot.rs b/xenclient/src/boot.rs
index 2428aa3..741f5bb 100644
--- a/xenclient/src/boot.rs
+++ b/xenclient/src/boot.rs
@@ -34,6 +34,7 @@ pub struct BootSetup<'a> {
     pfn_alloc_end: u64,
 }
 
+#[derive(Debug)]
 struct DomainSegment {
     _vstart: u64,
     _vend: u64,
@@ -143,10 +144,14 @@ impl BootSetup<'_> {
 
                 let allocsz = (1024 * 1024).min(pages - j);
                 let p2m_idx = (pfn_base + j) as usize;
-                let extent_start = p2m[p2m_idx];
-                let result =
-                    self.memctl
-                        .populate_physmap(self.domid, allocsz, 0, 0, &[extent_start])?;
+                let p2m_end_idx = p2m_idx + allocsz as usize;
+                let result = self.memctl.populate_physmap(
+                    self.domid,
+                    allocsz,
+                    0,
+                    0,
+                    &p2m[p2m_idx..p2m_end_idx],
+                )?;
 
                 if result.len() != allocsz as usize {
                     return Err(XenClientError::new(
@@ -163,7 +168,7 @@ impl BootSetup<'_> {
         Ok(())
     }
 
-    fn initialize_hypercall(&mut self, image_info: BootImageInfo) -> Result<(), XenClientError> {
+    fn _initialize_hypercall(&mut self, image_info: BootImageInfo) -> Result<(), XenClientError> {
         if image_info.virt_hypercall != XEN_UNSET_ADDR {
             self.domctl
                 .hypercall_init(self.domid, image_info.virt_hypercall)?;
@@ -178,8 +183,8 @@ impl BootSetup<'_> {
     ) -> Result<(), XenClientError> {
         self.domctl.set_max_mem(self.domid, memkb)?;
         self.initialize_memory(memkb)?;
-        let _kernel_segment = self.alloc_segment(image_info.virt_kend - image_info.virt_kstart)?;
-        self.initialize_hypercall(image_info)?;
+        let kernel_segment = self.alloc_segment(image_info.virt_kend - image_info.virt_kstart)?;
+        println!("kernel_segment: {:?}", kernel_segment);
         Ok(())
     }