diff --git a/tool/microkit/src/sdf.rs b/tool/microkit/src/sdf.rs
index e254a2e2d..e4059252d 100644
--- a/tool/microkit/src/sdf.rs
+++ b/tool/microkit/src/sdf.rs
@@ -336,6 +336,15 @@ impl SysMapPerms {
 }
 
 impl SysMap {
+    pub fn new(mr: String, vaddr: u64, perms: u8, cached: bool) -> Result<SysMap, String> {
+        Ok(SysMap {
+            mr,
+            vaddr,
+            perms,
+            cached,
+            text_pos: None,
+        })
+    }
     fn from_xml(
         xml_sdf: &XmlSystemDescription,
         node: &roxmltree::Node,
@@ -439,6 +448,52 @@ impl ProtectionDomain {
         ioports
     }
 
+    pub fn new(
+        id: Option<u64>,
+        name: String,
+        priority: u8,
+        budget: u64,
+        period: u64,
+        passive: bool,
+        stack_size: u64,
+        smc: bool,
+        cpu: CpuCore,
+        program_image: PathBuf,
+        maps: Vec<SysMap>,
+        irqs: Vec<SysIrq>,
+        ioports: Vec<IOPort>,
+        setvars: Vec<SysSetVar>,
+        virtual_machine: Option<VirtualMachine>,
+        child_pds: Vec<ProtectionDomain>,
+        has_children: bool,
+        setvar_id: Option<String>,
+    ) -> Result<ProtectionDomain, String> {
+        Ok(ProtectionDomain {
+            id,
+            name,
+            // This downcast is safe as we have checked that this is less than
+            // the maximum PD priority, which fits in a u8.
+            priority,
+            budget,
+            period,
+            passive,
+            stack_size,
+            smc,
+            cpu,
+            program_image,
+            maps,
+            irqs,
+            ioports,
+            setvars,
+            child_pds,
+            virtual_machine,
+            has_children,
+            parent: None,
+            setvar_id,
+            text_pos: None,
+        })
+    }
+
     fn from_xml(
         config: &Config,
         xml_sdf: &XmlSystemDescription,
@@ -1078,6 +1133,23 @@ impl ProtectionDomain {
 }
 
 impl VirtualMachine {
+    pub fn new(
+        vcpus: Vec<VirtualCpu>,
+        name: String,
+        maps: Vec<SysMap>,
+        priority: u8,
+        budget: u64,
+        period: u64,
+    ) -> Result<VirtualMachine, String> {
+        Ok(VirtualMachine {
+            vcpus,
+            name,
+            maps,
+            priority,
+            budget,
+            period,
+        })
+    }
     fn from_xml(
         config: &Config,
         xml_sdf: &XmlSystemDescription,
@@ -1204,6 +1276,26 @@ impl VirtualMachine {
 }
 
 impl SysMemoryRegion {
+    pub fn new(
+        name: String,
+        size: u64,
+        page_size: PageSize,
+        page_size_specified_by_user: bool,
+        phys_addr: SysMemoryRegionPaddr,
+        kind: SysMemoryRegionKind,
+    ) -> Result<SysMemoryRegion, String> {
+        Ok(SysMemoryRegion {
+            name,
+            size,
+            page_size,
+            page_size_specified_by_user,
+            page_count,
+            phys_addr,
+            text_pos: None,
+            kind,
+        })
+    }
+
     fn from_xml(
         config: &Config,
         xml_sdf: &XmlSystemDescription,
@@ -1272,6 +1364,22 @@ impl SysMemoryRegion {
 }
 
 impl ChannelEnd {
+    pub fn new(
+        pd_idx: usize,
+        id: u64,
+        notify: bool,
+        pp: bool,
+        setvar_id: Option<String>,
+    ) -> Result<ChannelEnd, String> {
+        Ok(ChannelEnd {
+            pd: pd_idx,
+            id: id,
+            notify,
+            pp,
+            setvar_id,
+        })
+    }
+
     fn from_xml<'a>(
         xml_sdf: &'a XmlSystemDescription,
         node: &'a roxmltree::Node,
@@ -1343,6 +1451,12 @@ impl ChannelEnd {
 }
 
 impl Channel {
+    pub fn new(end_a: ChannelEnd, end_b: ChannelEnd) -> Result<Channel, String> {
+        Ok(Channel {
+            end_a: end_a,
+            end_b: end_b,
+        })
+    }
     /// It should be noted that this function assumes that `pds` is populated
     /// with all the Protection Domains that could potentially be connected with
     /// the channel.