diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 8b52a881b0..67db09a424 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -255,6 +255,16 @@ int kvm_arm_rme_vm_type(MachineState *ms);
  */
 int kvm_arm_rme_vcpu_init(CPUState *cs);
 
+/*
+ * kvm_arm_rme_init_guest_ram
+ * @base: base address of RAM
+ * @size: size of RAM
+ *
+ * If the user requested a Realm, set the base and size of guest RAM, in order
+ * to initialize the Realm IPA space.
+ */
+void kvm_arm_rme_init_guest_ram(hwaddr base, size_t size);
+
 #else
 
 /*
@@ -281,6 +291,10 @@ static inline bool kvm_arm_mte_supported(void)
     return false;
 }
 
+static inline void kvm_arm_rme_init_guest_ram(hwaddr base, size_t size)
+{
+}
+
 /*
  * These functions should never actually be called without KVM support.
  */
diff --git a/target/arm/kvm-rme.c b/target/arm/kvm-rme.c
index e3cc37538a..83a29421df 100644
--- a/target/arm/kvm-rme.c
+++ b/target/arm/kvm-rme.c
@@ -9,6 +9,7 @@
 #include "exec/confidential-guest-support.h"
 #include "hw/boards.h"
 #include "hw/core/cpu.h"
+#include "hw/loader.h"
 #include "kvm_arm.h"
 #include "migration/blocker.h"
 #include "qapi/error.h"
@@ -20,16 +21,85 @@
 #define TYPE_RME_GUEST "rme-guest"
 OBJECT_DECLARE_SIMPLE_TYPE(RmeGuest, RME_GUEST)
 
+#define RME_PAGE_SIZE qemu_real_host_page_size()
+
 struct RmeGuest {
     ConfidentialGuestSupport parent_obj;
+    Notifier rom_load_notifier;
+    GSList *ram_regions;
+
+    hwaddr ram_base;
+    size_t ram_size;
 };
 
 OBJECT_DEFINE_SIMPLE_TYPE_WITH_INTERFACES(RmeGuest, rme_guest, RME_GUEST,
                                           CONFIDENTIAL_GUEST_SUPPORT,
                                           { TYPE_USER_CREATABLE }, { })
 
+typedef struct {
+    hwaddr base;
+    hwaddr size;
+} RmeRamRegion;
+
 static RmeGuest *rme_guest;
 
+static int rme_init_ram(hwaddr base, size_t size, Error **errp)
+{
+    int ret;
+    uint64_t start = QEMU_ALIGN_DOWN(base, RME_PAGE_SIZE);
+    uint64_t end = QEMU_ALIGN_UP(base + size, RME_PAGE_SIZE);
+    struct kvm_cap_arm_rme_init_ipa_args init_args = {
+        .init_ipa_base = start,
+        .init_ipa_size = end - start,
+    };
+
+    ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_ARM_RME, 0,
+                            KVM_CAP_ARM_RME_INIT_IPA_REALM,
+                            (intptr_t)&init_args);
+    if (ret) {
+        error_setg_errno(errp, -ret,
+                         "failed to init RAM [0x%"HWADDR_PRIx", 0x%"HWADDR_PRIx")",
+                         start, end);
+    }
+
+    return ret;
+}
+
+static int rme_populate_range(hwaddr base, size_t size, bool measure,
+                              Error **errp)
+{
+    int ret;
+    uint64_t start = QEMU_ALIGN_DOWN(base, RME_PAGE_SIZE);
+    uint64_t end = QEMU_ALIGN_UP(base + size, RME_PAGE_SIZE);
+    struct kvm_cap_arm_rme_populate_realm_args populate_args = {
+        .populate_ipa_base = start,
+        .populate_ipa_size = end - start,
+        .flags = measure ? KVM_ARM_RME_POPULATE_FLAGS_MEASURE : 0,
+    };
+
+    ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_ARM_RME, 0,
+                            KVM_CAP_ARM_RME_POPULATE_REALM,
+                            (intptr_t)&populate_args);
+    if (ret) {
+        error_setg_errno(errp, -ret,
+                   "failed to populate realm [0x%"HWADDR_PRIx", 0x%"HWADDR_PRIx")",
+                   start, end);
+    }
+    return ret;
+}
+
+static void rme_populate_ram_region(gpointer data, gpointer err)
+{
+    Error **errp = err;
+    const RmeRamRegion *region = data;
+
+    if (*errp) {
+        return;
+    }
+
+    rme_populate_range(region->base, region->size, /* measure */ true, errp);
+}
+
 static int rme_init_cpus(Error **errp)
 {
     int ret;
@@ -60,6 +130,16 @@ static int rme_create_realm(Error **errp)
         return -1;
     }
 
+    if (rme_init_ram(rme_guest->ram_base, rme_guest->ram_size, errp)) {
+        return -1;
+    }
+
+    g_slist_foreach(rme_guest->ram_regions, rme_populate_ram_region, errp);
+    g_slist_free_full(g_steal_pointer(&rme_guest->ram_regions), g_free);
+    if (*errp) {
+        return -1;
+    }
+
     if (rme_init_cpus(errp)) {
         return -1;
     }
@@ -105,6 +185,43 @@ static void rme_guest_finalize(Object *obj)
 {
 }
 
+static gint rme_compare_ram_regions(gconstpointer a, gconstpointer b)
+{
+        const RmeRamRegion *ra = a;
+        const RmeRamRegion *rb = b;
+
+        g_assert(ra->base != rb->base);
+        return ra->base < rb->base ? -1 : 1;
+}
+
+static void rme_rom_load_notify(Notifier *notifier, void *data)
+{
+    RmeRamRegion *region;
+    RomLoaderNotify *rom = data;
+
+    if (rom->addr == -1) {
+        /*
+         * These blobs (ACPI tables) are not loaded into guest RAM at reset.
+         * Instead the firmware will load them via fw_cfg and measure them
+         * itself.
+         */
+        return;
+    }
+
+    region = g_new0(RmeRamRegion, 1);
+    region->base = rom->addr;
+    region->size = rom->len;
+
+    /*
+     * The Realm Initial Measurement (RIM) depends on the order in which we
+     * initialize and populate the RAM regions. To help a verifier
+     * independently calculate the RIM, sort regions by GPA.
+     */
+    rme_guest->ram_regions = g_slist_insert_sorted(rme_guest->ram_regions,
+                                                   region,
+                                                   rme_compare_ram_regions);
+}
+
 int kvm_arm_rme_init(MachineState *ms)
 {
     static Error *rme_mig_blocker;
@@ -132,11 +249,22 @@ int kvm_arm_rme_init(MachineState *ms)
      */
     qemu_add_vm_change_state_handler(rme_vm_state_change, NULL);
 
+    rme_guest->rom_load_notifier.notify = rme_rom_load_notify;
+    rom_add_load_notifier(&rme_guest->rom_load_notifier);
+
     cgs->require_guest_memfd = true;
     cgs->ready = true;
     return 0;
 }
 
+void kvm_arm_rme_init_guest_ram(hwaddr base, size_t size)
+{
+    if (rme_guest) {
+        rme_guest->ram_base = base;
+        rme_guest->ram_size = size;
+    }
+}
+
 int kvm_arm_rme_vcpu_init(CPUState *cs)
 {
     ARMCPU *cpu = ARM_CPU(cs);
