[PATCH v2 1/7] exec: Let address_space_read/write_cached() propagate MemTxResult

[Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>]

Both address_space_read_cached_slow() and
address_space_write_cached_slow() return a MemTxResult type.
Do not discard it, return it to the caller.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
---
 include/exec/memory.h | 19 +++++++++++--------
 exec.c                | 16 ++++++++--------
 2 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index e000bd2f97..5e8c009169 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -2343,10 +2343,11 @@ void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);
 
 /* Internal functions, part of the implementation of address_space_read_cached
  * and address_space_write_cached.  */
-void address_space_read_cached_slow(MemoryRegionCache *cache,
-                                    hwaddr addr, void *buf, hwaddr len);
-void address_space_write_cached_slow(MemoryRegionCache *cache,
-                                     hwaddr addr, const void *buf, hwaddr len);
+MemTxResult address_space_read_cached_slow(MemoryRegionCache *cache,
+                                           hwaddr addr, void *buf, hwaddr len);
+MemTxResult address_space_write_cached_slow(MemoryRegionCache *cache,
+                                            hwaddr addr, const void *buf,
+                                            hwaddr len);
 
 static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
 {
@@ -2411,15 +2412,16 @@ MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
  * @buf: buffer with the data transferred
  * @len: length of the data transferred
  */
-static inline void
+static inline MemTxResult
 address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
                           void *buf, hwaddr len)
 {
     assert(addr < cache->len && len <= cache->len - addr);
     if (likely(cache->ptr)) {
         memcpy(buf, cache->ptr + addr, len);
+        return MEMTX_OK;
     } else {
-        address_space_read_cached_slow(cache, addr, buf, len);
+        return address_space_read_cached_slow(cache, addr, buf, len);
     }
 }
 
@@ -2431,15 +2433,16 @@ address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
  * @buf: buffer with the data transferred
  * @len: length of the data transferred
  */
-static inline void
+static inline MemTxResult
 address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
                            const void *buf, hwaddr len)
 {
     assert(addr < cache->len && len <= cache->len - addr);
     if (likely(cache->ptr)) {
         memcpy(cache->ptr + addr, buf, len);
+        return MEMTX_OK;
     } else {
-        address_space_write_cached_slow(cache, addr, buf, len);
+        return address_space_write_cached_slow(cache, addr, buf, len);
     }
 }
 
diff --git a/exec.c b/exec.c
index 5162f0d12f..877b51cc5c 100644
--- a/exec.c
+++ b/exec.c
@@ -3716,7 +3716,7 @@ static inline MemoryRegion *address_space_translate_cached(
 /* Called from RCU critical section. address_space_read_cached uses this
  * out of line function when the target is an MMIO or IOMMU region.
  */
-void
+MemTxResult
 address_space_read_cached_slow(MemoryRegionCache *cache, hwaddr addr,
                                    void *buf, hwaddr len)
 {
@@ -3726,15 +3726,15 @@ address_space_read_cached_slow(MemoryRegionCache *cache, hwaddr addr,
     l = len;
     mr = address_space_translate_cached(cache, addr, &addr1, &l, false,
                                         MEMTXATTRS_UNSPECIFIED);
-    flatview_read_continue(cache->fv,
-                           addr, MEMTXATTRS_UNSPECIFIED, buf, len,
-                           addr1, l, mr);
+    return flatview_read_continue(cache->fv,
+                                  addr, MEMTXATTRS_UNSPECIFIED, buf, len,
+                                  addr1, l, mr);
 }
 
 /* Called from RCU critical section. address_space_write_cached uses this
  * out of line function when the target is an MMIO or IOMMU region.
  */
-void
+MemTxResult
 address_space_write_cached_slow(MemoryRegionCache *cache, hwaddr addr,
                                     const void *buf, hwaddr len)
 {
@@ -3744,9 +3744,9 @@ address_space_write_cached_slow(MemoryRegionCache *cache, hwaddr addr,
     l = len;
     mr = address_space_translate_cached(cache, addr, &addr1, &l, true,
                                         MEMTXATTRS_UNSPECIFIED);
-    flatview_write_continue(cache->fv,
-                            addr, MEMTXATTRS_UNSPECIFIED, buf, len,
-                            addr1, l, mr);
+    return flatview_write_continue(cache->fv,
+                                   addr, MEMTXATTRS_UNSPECIFIED, buf, len,
+                                   addr1, l, mr);
 }
 
 #define ARG1_DECL                MemoryRegionCache *cache
-- 
2.21.3