diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 6d4ea4b6c922..dc77a5a3648d 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1145,6 +1145,7 @@ struct kvm_dirty_tlb {
 #define KVM_REG_SIZE_U256	0x0050000000000000ULL
 #define KVM_REG_SIZE_U512	0x0060000000000000ULL
 #define KVM_REG_SIZE_U1024	0x0070000000000000ULL
+#define KVM_REG_SIZE_U2048	0x0080000000000000ULL
 
 struct kvm_reg_list {
 	__u64 n; /* number of regs */