Make flatview_access_valid() take a MemTxAttrs argument

As part of plumbing MemTxAttrs down to the IOMMU translate method,
add MemTxAttrs as an argument to flatview_access_valid().
Its callers now all have an attrs value to hand, so we can
correct our earlier temporary use of MEMTXATTRS_UNSPECIFIED.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20180521140402.23318-10-peter.maydell@linaro.org

exec.c

@@ -2697,7 +2697,7 @@ static MemTxResult flatview_read(FlatView *fv, hwaddr addr,
 static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
                                   const uint8_t *buf, int len);
 static bool flatview_access_valid(FlatView *fv, hwaddr addr, int len,
-                                  bool is_write);
+                                  bool is_write, MemTxAttrs attrs);
 
 static MemTxResult subpage_read(void *opaque, hwaddr addr, uint64_t *data,
                                 unsigned len, MemTxAttrs attrs)
@@ -2773,7 +2773,7 @@ static bool subpage_accepts(void *opaque, hwaddr addr,
 #endif
 
     return flatview_access_valid(subpage->fv, addr + subpage->base,
-                                 len, is_write);
+                                 len, is_write, attrs);
 }
 
 static const MemoryRegionOps subpage_ops = {
@@ -3461,7 +3461,7 @@ static void cpu_notify_map_clients(void)
 }
 
 static bool flatview_access_valid(FlatView *fv, hwaddr addr, int len,
-                                  bool is_write)
+                                  bool is_write, MemTxAttrs attrs)
 {
     MemoryRegion *mr;
     hwaddr l, xlat;
@@ -3471,9 +3471,7 @@ static bool flatview_access_valid(FlatView *fv, hwaddr addr, int len,
         mr = flatview_translate(fv, addr, &xlat, &l, is_write);
         if (!memory_access_is_direct(mr, is_write)) {
             l = memory_access_size(mr, l, addr);
-            /* When our callers all have attrs we'll pass them through here */
-            if (!memory_region_access_valid(mr, xlat, l, is_write,
-                                            MEMTXATTRS_UNSPECIFIED)) {
+            if (!memory_region_access_valid(mr, xlat, l, is_write, attrs)) {
                 return false;
             }
         }
@@ -3493,7 +3491,7 @@ bool address_space_access_valid(AddressSpace *as, hwaddr addr,
 
     rcu_read_lock();
     fv = address_space_to_flatview(as);
-    result = flatview_access_valid(fv, addr, len, is_write);
+    result = flatview_access_valid(fv, addr, len, is_write, attrs);
     rcu_read_unlock();
     return result;
 }