diff --git a/xen/arch/riscv/include/asm/domain.h b/xen/arch/riscv/include/asm/domain.h
index 6c48bf1311..6044ce0fee 100644
--- a/xen/arch/riscv/include/asm/domain.h
+++ b/xen/arch/riscv/include/asm/domain.h
@@ -7,6 +7,7 @@
 #include <xen/xmalloc.h>
 #include <public/hvm/params.h>
 
+#include <asm/guest-layout.h>
 #include <asm/p2m.h>
 #include <asm/vtimer.h>
 
diff --git a/xen/arch/riscv/include/asm/guest-layout.h b/xen/arch/riscv/include/asm/guest-layout.h
new file mode 100644
index 0000000000..68d95a0939
--- /dev/null
+++ b/xen/arch/riscv/include/asm/guest-layout.h
@@ -0,0 +1,23 @@
+#ifndef ASM_RISCV_GUEST_LAYOUT_H
+#define ASM_RISCV_GUEST_LAYOUT_H
+
+#include <public/xen.h>
+
+#define GUEST_RAM_BANKS   2
+
+/*
+ * The way to find the extended regions (to be exposed to the guest as unused
+ * address space) relies on the fact that the regions reserved for the RAM
+ * below are big enough to also accommodate such regions.
+ */
+#define GUEST_RAM0_BASE   xen_mk_ullong(0x80000000) /* 2GB of low RAM @ 2GB */
+#define GUEST_RAM0_SIZE   xen_mk_ullong(0x80000000)
+
+#define GUEST_RAM1_BASE   xen_mk_ullong(0x0200000000) /* 1016 GB of RAM @ 8GB */
+#define GUEST_RAM1_SIZE   xen_mk_ullong(0xFE00000000)
+
+/* TODO: allocate these all dynamically */
+#define GUEST_RAM_BANK_BASES   { GUEST_RAM0_BASE, GUEST_RAM1_BASE }
+#define GUEST_RAM_BANK_SIZES   { GUEST_RAM0_SIZE, GUEST_RAM1_SIZE }
+
+#endif /* ASM_RISCV_GUEST_LAYOUT_H */