exec: make io_mem_unassigned private

There is no reason to avoid a recompile before accessing unassigned
memory.  In the end it will be treated as MMIO anyway.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

exec.c

diff --git a/exec.c b/exec.c
index 7728ea3..7e22980 100644
--- a/exec.c
+++ b/exec.c
@@ -66,8 +66,8 @@
 AddressSpace address_space_memory;
 DMAContext dma_context_memory;
 
-MemoryRegion io_mem_rom, io_mem_unassigned, io_mem_notdirty;
-static MemoryRegion io_mem_subpage_ram;
+MemoryRegion io_mem_rom, io_mem_notdirty;
+static MemoryRegion io_mem_unassigned, io_mem_subpage_ram;
 
 #endif
 

include/exec/cpu-common.h

diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index 1686b8f..e061e21 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -111,7 +111,6 @@
                                    const uint8_t *buf, int len);
 
 extern struct MemoryRegion io_mem_rom;
-extern struct MemoryRegion io_mem_unassigned;
 extern struct MemoryRegion io_mem_notdirty;
 
 #endif

include/exec/softmmu_template.h

diff --git a/include/exec/softmmu_template.h b/include/exec/softmmu_template.h
index 4501dac..ca91fd0 100644
--- a/include/exec/softmmu_template.h
+++ b/include/exec/softmmu_template.h
@@ -68,10 +68,7 @@
 
     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
     env->mem_io_pc = retaddr;
-    if (mr != &io_mem_rom
-        && mr != &io_mem_unassigned
-        && mr != &io_mem_notdirty
-            && !can_do_io(env)) {
+    if (mr != &io_mem_rom && mr != &io_mem_notdirty && !can_do_io(env)) {
         cpu_io_recompile(env, retaddr);
     }
 
@@ -218,10 +215,7 @@
     MemoryRegion *mr = iotlb_to_region(physaddr);
 
     physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
-    if (mr != &io_mem_rom
-        && mr != &io_mem_unassigned
-        && mr != &io_mem_notdirty
-            && !can_do_io(env)) {
+    if (mr != &io_mem_rom && mr != &io_mem_notdirty && !can_do_io(env)) {
         cpu_io_recompile(env, retaddr);
     }