Avoid address_space_rw() with a constant is_write argument

The address_space_rw() function allows either reads or writes
depending on the is_write argument passed to it; this is useful
when the direction of the access is determined programmatically
(as for instance when handling the KVM_EXIT_MMIO exit reason).
Under the hood it just calls either address_space_write() or
address_space_read_full().

We also use it a lot with a constant is_write argument, though,
which has two issues:
 * when reading "address_space_rw(..., 1)" this is less
   immediately clear to the reader as being a write than
   "address_space_write(...)"
 * calling address_space_rw() bypasses the optimization
   in address_space_read() that fast-paths reads of a
   fixed length

This commit was produced with the included Coccinelle script
scripts/coccinelle/exec_rw_const.cocci.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20200218112457.22712-1-peter.maydell@linaro.org>
[PMD: Update macvm_set_cr0() reported by Laurent Vivier]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

1 files changed, 26 insertions, 26 deletions

diff --git a/qtest.c b/qtest.c
index 65e33b80e3..dcb57498ad 100644
--- a/qtest.c
+++ b/qtest.c
@@ -429,23 +429,23 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
 
         if (words[0][5] == 'b') {
             uint8_t data = value;
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &data, 1, true);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 1);
         } else if (words[0][5] == 'w') {
             uint16_t data = value;
             tswap16s(&data);
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &data, 2, true);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 2);
         } else if (words[0][5] == 'l') {
             uint32_t data = value;
             tswap32s(&data);
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &data, 4, true);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 4);
         } else if (words[0][5] == 'q') {
             uint64_t data = value;
             tswap64s(&data);
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &data, 8, true);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 8);
         }
         qtest_send_prefix(chr);
         qtest_send(chr, "OK\n");
@@ -463,22 +463,22 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
 
         if (words[0][4] == 'b') {
             uint8_t data;
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &data, 1, false);
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &data, 1);
             value = data;
         } else if (words[0][4] == 'w') {
             uint16_t data;
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &data, 2, false);
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &data, 2);
             value = tswap16(data);
         } else if (words[0][4] == 'l') {
             uint32_t data;
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &data, 4, false);
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &data, 4);
             value = tswap32(data);
         } else if (words[0][4] == 'q') {
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             &value, 8, false);
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &value, 8);
             tswap64s(&value);
         }
         qtest_send_prefix(chr);
@@ -498,8 +498,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         g_assert(len);
 
         data = g_malloc(len);
-        address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                         data, len, false);
+        address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                           len);
 
         enc = g_malloc(2 * len + 1);
         for (i = 0; i < len; i++) {
@@ -524,8 +524,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         g_assert(ret == 0);
 
         data = g_malloc(len);
-        address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                         data, len, false);
+        address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                           len);
         b64_data = g_base64_encode(data, len);
         qtest_send_prefix(chr);
         qtest_sendf(chr, "OK %s\n", b64_data);
@@ -559,8 +559,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
                 data[i] = 0;
             }
         }
-        address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                         data, len, true);
+        address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                            len);
         g_free(data);
 
         qtest_send_prefix(chr);
@@ -582,8 +582,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
         if (len) {
             data = g_malloc(len);
             memset(data, pattern, len);
-            address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                             data, len, true);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                data, len);
             g_free(data);
         }
 
@@ -616,8 +616,8 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
             out_len = MIN(out_len, len);
         }
 
-        address_space_rw(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
-                         data, len, true);
+        address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                            len);
 
         qtest_send_prefix(chr);
         qtest_send(chr, "OK\n");