diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9dbc7435cbc203fa7be752e7ae3d37966f684ad8..848947ac6ade478e453b3ef786159463761b0c75 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -38,8 +38,6 @@
 #define KVM_PRIVATE_MEM_SLOTS 3
 #define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 
-#define KVM_MMIO_SIZE 16
-
 #define KVM_PIO_PAGE_OFFSET 1
 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
 
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 32d057571bf624a6a8726bda0522a3f353cb96fd..8a82838034f16ca2a51cfafd1456eb1aacdb1d82 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -33,10 +33,6 @@
 
 #include <asm/kvm_host.h>
 
-#ifndef KVM_MMIO_SIZE
-#define KVM_MMIO_SIZE 8
-#endif
-
 /*
  * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
  * in kvm, other bits are visible for userspace which are defined in