diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index d2d443c4f9..3928edab9a 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -331,6 +331,8 @@ CPUArchState *cpu_copy(CPUArchState *env);
 #define TLB_MMIO            (1 << (TARGET_PAGE_BITS - 3))
 /* Set if TLB entry contains a watchpoint.  */
 #define TLB_WATCHPOINT      (1 << (TARGET_PAGE_BITS - 4))
+/* Set if TLB entry requires byte swap.  */
+#define TLB_BSWAP           (1 << (TARGET_PAGE_BITS - 5))
 
 /* Use this mask to check interception with an alignment mask
  * in a TCG backend.
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index e6229d100a..eace6c82e3 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -737,8 +737,7 @@ void tlb_set_page_with_attrs(CPUState *cpu, target_ulong vaddr,
         address |= TLB_INVALID_MASK;
     }
     if (attrs.byte_swap) {
-        /* Force the access through the I/O slow path.  */
-        address |= TLB_MMIO;
+        address |= TLB_BSWAP;
     }
     if (!memory_region_is_ram(section->mr) &&
         !memory_region_is_romd(section->mr)) {
@@ -901,10 +900,6 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
     bool locked = false;
     MemTxResult r;
 
-    if (iotlbentry->attrs.byte_swap) {
-        op ^= MO_BSWAP;
-    }
-
     section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
     mr = section->mr;
     mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
@@ -947,10 +942,6 @@ static void io_writex(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
     bool locked = false;
     MemTxResult r;
 
-    if (iotlbentry->attrs.byte_swap) {
-        op ^= MO_BSWAP;
-    }
-
     section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
     mr = section->mr;
     mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
@@ -1322,7 +1313,8 @@ static inline uint64_t direct_ldul_le(const void *haddr)
 static inline uint64_t ALWAYS_INLINE
 load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
             uintptr_t retaddr, MemOp op, bool code_read,
-            FullLoadHelper *full_load, DirectLoadHelper *direct)
+            FullLoadHelper *full_load, DirectLoadHelper *direct,
+            DirectLoadHelper *direct_swap)
 {
     uintptr_t mmu_idx = get_mmuidx(oi);
     uintptr_t index = tlb_index(env, mmu_idx, addr);
@@ -1372,26 +1364,27 @@ load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
             /* On watchpoint hit, this will longjmp out.  */
             cpu_check_watchpoint(env_cpu(env), addr, size,
                                  iotlbentry->attrs, BP_MEM_READ, retaddr);
-
-            /* The backing page may or may not require I/O.  */
-            tlb_addr &= ~TLB_WATCHPOINT;
-            if ((tlb_addr & ~TARGET_PAGE_MASK) == 0) {
-                goto do_aligned_access;
-            }
         }
 
         /* Handle I/O access.  */
-        return io_readx(env, iotlbentry, mmu_idx, addr,
-                        retaddr, access_type, op);
-    }
+        if (likely(tlb_addr & TLB_MMIO)) {
+            return io_readx(env, iotlbentry, mmu_idx, addr,
+                            retaddr, access_type,
+                            op ^ (tlb_addr & TLB_BSWAP ? MO_BSWAP : 0));
+        }
 
-    /* Handle slow unaligned access (it spans two pages or IO).  */
-    if (size > 1
-        && unlikely((addr & ~TARGET_PAGE_MASK) + size - 1
-                    >= TARGET_PAGE_SIZE)) {
+        if (unlikely(tlb_addr & TLB_BSWAP)) {
+            haddr = (void *)((uintptr_t)addr + entry->addend);
+            return direct_swap(haddr);
+        }
+    } else if (size > 1
+               && unlikely((addr & ~TARGET_PAGE_MASK) + size - 1
+                           >= TARGET_PAGE_SIZE)) {
+        /* Handle slow unaligned access (it spans two pages or IO).  */
         target_ulong addr1, addr2;
         uint64_t r1, r2;
         unsigned shift;
+
     do_unaligned_access:
         addr1 = addr & ~((target_ulong)size - 1);
         addr2 = addr1 + size;
@@ -1409,7 +1402,6 @@ load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
         return res & MAKE_64BIT_MASK(0, size * 8);
     }
 
- do_aligned_access:
     haddr = (void *)((uintptr_t)addr + entry->addend);
     return direct(haddr);
 }
@@ -1428,7 +1420,7 @@ static uint64_t full_ldub_mmu(CPUArchState *env, target_ulong addr,
                               TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_UB, false,
-                       full_ldub_mmu, direct_ldub);
+                       full_ldub_mmu, direct_ldub, direct_ldub);
 }
 
 tcg_target_ulong helper_ret_ldub_mmu(CPUArchState *env, target_ulong addr,
@@ -1441,7 +1433,7 @@ static uint64_t full_le_lduw_mmu(CPUArchState *env, target_ulong addr,
                                  TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_LEUW, false,
-                       full_le_lduw_mmu, direct_lduw_le);
+                       full_le_lduw_mmu, direct_lduw_le, direct_lduw_be);
 }
 
 tcg_target_ulong helper_le_lduw_mmu(CPUArchState *env, target_ulong addr,
@@ -1454,7 +1446,7 @@ static uint64_t full_be_lduw_mmu(CPUArchState *env, target_ulong addr,
                                  TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_BEUW, false,
-                       full_be_lduw_mmu, direct_lduw_be);
+                       full_be_lduw_mmu, direct_lduw_be, direct_lduw_le);
 }
 
 tcg_target_ulong helper_be_lduw_mmu(CPUArchState *env, target_ulong addr,
@@ -1467,7 +1459,7 @@ static uint64_t full_le_ldul_mmu(CPUArchState *env, target_ulong addr,
                                  TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_LEUL, false,
-                       full_le_ldul_mmu, direct_ldul_le);
+                       full_le_ldul_mmu, direct_ldul_le, direct_ldul_be);
 }
 
 tcg_target_ulong helper_le_ldul_mmu(CPUArchState *env, target_ulong addr,
@@ -1480,7 +1472,7 @@ static uint64_t full_be_ldul_mmu(CPUArchState *env, target_ulong addr,
                                  TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_BEUL, false,
-                       full_be_ldul_mmu, direct_ldul_be);
+                       full_be_ldul_mmu, direct_ldul_be, direct_ldul_le);
 }
 
 tcg_target_ulong helper_be_ldul_mmu(CPUArchState *env, target_ulong addr,
@@ -1493,14 +1485,14 @@ uint64_t helper_le_ldq_mmu(CPUArchState *env, target_ulong addr,
                            TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_LEQ, false,
-                       helper_le_ldq_mmu, ldq_le_p);
+                       helper_le_ldq_mmu, ldq_le_p, ldq_be_p);
 }
 
 uint64_t helper_be_ldq_mmu(CPUArchState *env, target_ulong addr,
                            TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_BEQ, false,
-                       helper_be_ldq_mmu, ldq_be_p);
+                       helper_be_ldq_mmu, ldq_be_p, ldq_le_p);
 }
 
 /*
@@ -1573,7 +1565,7 @@ static inline void direct_stl_le(void *haddr, uint64_t val)
 static inline void ALWAYS_INLINE
 store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
              TCGMemOpIdx oi, uintptr_t retaddr, MemOp op,
-             DirectStoreHelper *direct)
+             DirectStoreHelper *direct, DirectStoreHelper *direct_swap)
 {
     uintptr_t mmu_idx = get_mmuidx(oi);
     uintptr_t index = tlb_index(env, mmu_idx, addr);
@@ -1618,23 +1610,24 @@ store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
             /* On watchpoint hit, this will longjmp out.  */
             cpu_check_watchpoint(env_cpu(env), addr, size,
                                  iotlbentry->attrs, BP_MEM_WRITE, retaddr);
-
-            /* The backing page may or may not require I/O.  */
-            tlb_addr &= ~TLB_WATCHPOINT;
-            if ((tlb_addr & ~TARGET_PAGE_MASK) == 0) {
-                goto do_aligned_access;
-            }
         }
 
         /* Handle I/O access.  */
-        io_writex(env, iotlbentry, mmu_idx, val, addr, retaddr, op);
-        return;
-    }
+        if (likely(tlb_addr & TLB_MMIO)) {
+            io_writex(env, iotlbentry, mmu_idx, val, addr, retaddr,
+                      op ^ (tlb_addr & TLB_BSWAP ? MO_BSWAP : 0));
+            return;
+        }
 
-    /* Handle slow unaligned access (it spans two pages or IO).  */
-    if (size > 1
-        && unlikely((addr & ~TARGET_PAGE_MASK) + size - 1
-                     >= TARGET_PAGE_SIZE)) {
+        if (unlikely(tlb_addr & TLB_BSWAP)) {
+            haddr = (void *)((uintptr_t)addr + entry->addend);
+            direct_swap(haddr, val);
+            return;
+        }
+    } else if (size > 1
+               && unlikely((addr & ~TARGET_PAGE_MASK) + size - 1
+                            >= TARGET_PAGE_SIZE)) {
+        /* Handle slow unaligned access (it spans two pages or IO).  */
         int i;
         uintptr_t index2;
         CPUTLBEntry *entry2;
@@ -1696,7 +1689,6 @@ store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
         return;
     }
 
- do_aligned_access:
     haddr = (void *)((uintptr_t)addr + entry->addend);
     direct(haddr, val);
 }
@@ -1704,43 +1696,47 @@ store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
 void helper_ret_stb_mmu(CPUArchState *env, target_ulong addr, uint8_t val,
                         TCGMemOpIdx oi, uintptr_t retaddr)
 {
-    store_helper(env, addr, val, oi, retaddr, MO_UB, direct_stb);
+    store_helper(env, addr, val, oi, retaddr, MO_UB, direct_stb, direct_stb);
 }
 
 void helper_le_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
-    store_helper(env, addr, val, oi, retaddr, MO_LEUW, direct_stw_le);
+    store_helper(env, addr, val, oi, retaddr, MO_LEUW,
+                 direct_stw_le, direct_stw_be);
 }
 
 void helper_be_stw_mmu(CPUArchState *env, target_ulong addr, uint16_t val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
-    store_helper(env, addr, val, oi, retaddr, MO_BEUW, direct_stw_be);
+    store_helper(env, addr, val, oi, retaddr, MO_BEUW,
+                 direct_stw_be, direct_stw_le);
 }
 
 void helper_le_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
-    store_helper(env, addr, val, oi, retaddr, MO_LEUL, direct_stl_le);
+    store_helper(env, addr, val, oi, retaddr, MO_LEUL,
+                 direct_stl_le, direct_stl_be);
 }
 
 void helper_be_stl_mmu(CPUArchState *env, target_ulong addr, uint32_t val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
-    store_helper(env, addr, val, oi, retaddr, MO_BEUL, direct_stl_be);
+    store_helper(env, addr, val, oi, retaddr, MO_BEUL,
+                 direct_stl_be, direct_stl_le);
 }
 
 void helper_le_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
-    store_helper(env, addr, val, oi, retaddr, MO_LEQ, stq_le_p);
+    store_helper(env, addr, val, oi, retaddr, MO_LEQ, stq_le_p, stq_be_p);
 }
 
 void helper_be_stq_mmu(CPUArchState *env, target_ulong addr, uint64_t val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
-    store_helper(env, addr, val, oi, retaddr, MO_BEQ, stq_be_p);
+    store_helper(env, addr, val, oi, retaddr, MO_BEQ, stq_be_p, stq_le_p);
 }
 
 /* First set of helpers allows passing in of OI and RETADDR.  This makes
@@ -1806,7 +1802,7 @@ static uint64_t full_ldub_cmmu(CPUArchState *env, target_ulong addr,
                                TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_8, true,
-                       full_ldub_cmmu, direct_ldub);
+                       full_ldub_cmmu, direct_ldub, direct_ldub);
 }
 
 uint8_t helper_ret_ldb_cmmu(CPUArchState *env, target_ulong addr,
@@ -1819,7 +1815,7 @@ static uint64_t full_le_lduw_cmmu(CPUArchState *env, target_ulong addr,
                                   TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_LEUW, true,
-                       full_le_lduw_cmmu, direct_lduw_le);
+                       full_le_lduw_cmmu, direct_lduw_le, direct_lduw_be);
 }
 
 uint16_t helper_le_ldw_cmmu(CPUArchState *env, target_ulong addr,
@@ -1832,7 +1828,7 @@ static uint64_t full_be_lduw_cmmu(CPUArchState *env, target_ulong addr,
                                   TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_BEUW, true,
-                       full_be_lduw_cmmu, direct_lduw_be);
+                       full_be_lduw_cmmu, direct_lduw_be, direct_lduw_le);
 }
 
 uint16_t helper_be_ldw_cmmu(CPUArchState *env, target_ulong addr,
@@ -1845,7 +1841,7 @@ static uint64_t full_le_ldul_cmmu(CPUArchState *env, target_ulong addr,
                                   TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_LEUL, true,
-                       full_le_ldul_cmmu, direct_ldul_le);
+                       full_le_ldul_cmmu, direct_ldul_le, direct_ldul_be);
 }
 
 uint32_t helper_le_ldl_cmmu(CPUArchState *env, target_ulong addr,
@@ -1858,7 +1854,7 @@ static uint64_t full_be_ldul_cmmu(CPUArchState *env, target_ulong addr,
                                   TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_BEUL, true,
-                       full_be_ldul_cmmu, direct_ldul_be);
+                       full_be_ldul_cmmu, direct_ldul_be, direct_ldul_le);
 }
 
 uint32_t helper_be_ldl_cmmu(CPUArchState *env, target_ulong addr,
@@ -1871,12 +1867,12 @@ uint64_t helper_le_ldq_cmmu(CPUArchState *env, target_ulong addr,
                             TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_LEQ, true,
-                       helper_le_ldq_cmmu, ldq_le_p);
+                       helper_le_ldq_cmmu, ldq_le_p, ldq_be_p);
 }
 
 uint64_t helper_be_ldq_cmmu(CPUArchState *env, target_ulong addr,
                             TCGMemOpIdx oi, uintptr_t retaddr)
 {
     return load_helper(env, addr, oi, retaddr, MO_BEQ, true,
-                       helper_be_ldq_cmmu, ldq_be_p);
+                       helper_be_ldq_cmmu, ldq_be_p, ldq_le_p);
 }
