[v6,02/18] cpu: Introduce cpu_virtio_is_big_endian()

Commit Message

Philippe Mathieu-Daudé April 22, 2021, 7:38 p.m. UTC

Introduce the cpu_virtio_is_big_endian() generic helper to avoid
calling CPUClass internal virtio_is_big_endian() one.

Similarly to commit bf7663c4bd8 ("cpu: introduce
CPUClass::virtio_is_big_endian()"), we keep 'virtio' in the method
name to hint this handler shouldn't be called anywhere but from the
virtio code.

Reviewed-by: Richard Henderson <[e-mail]>
Signed-off-by: Philippe Mathieu-Daudé <[e-mail]>
---
 include/hw/core/cpu.h | 9 +++++++++
 hw/core/cpu.c         | 8 ++++++--
 hw/virtio/virtio.c    | 4 +---
 3 files changed, 16 insertions(+), 5 deletions(-)

Patch

diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index 9338e80aa4b..08af2c383a5 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -604,6 +604,15 @@  hwaddr cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
  */
 int cpu_asidx_from_attrs(CPUState *cpu, MemTxAttrs attrs);
 
+/**
+ * cpu_virtio_is_big_endian:
+ * @cpu: CPU
+
+ * Returns %true if a CPU which supports runtime configurable endianness
+ * is currently big-endian.
+ */
+bool cpu_virtio_is_big_endian(CPUState *cpu);
+
 #endif /* CONFIG_USER_ONLY */
 
 /**
diff --git a/hw/core/cpu.c b/hw/core/cpu.c
index 4dce35f832f..daaff56a79e 100644
--- a/hw/core/cpu.c
+++ b/hw/core/cpu.c
@@ -218,8 +218,13 @@  static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
     return 0;
 }
 
-static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
+bool cpu_virtio_is_big_endian(CPUState *cpu)
 {
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+
+    if (cc->virtio_is_big_endian) {
+        return cc->virtio_is_big_endian(cpu);
+    }
     return target_words_bigendian();
 }
 
@@ -438,7 +443,6 @@  static void cpu_class_init(ObjectClass *klass, void *data)
     k->write_elf64_note = cpu_common_write_elf64_note;
     k->gdb_read_register = cpu_common_gdb_read_register;
     k->gdb_write_register = cpu_common_gdb_write_register;
-    k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
     dc->realize = cpu_common_realizefn;
     dc->unrealize = cpu_common_unrealizefn;
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 07f4e60b309..8a364496fd5 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1973,9 +1973,7 @@  static enum virtio_device_endian virtio_default_endian(void)
 
 static enum virtio_device_endian virtio_current_cpu_endian(void)
 {
-    CPUClass *cc = CPU_GET_CLASS(current_cpu);
-
-    if (cc->virtio_is_big_endian(current_cpu)) {
+    if (cpu_virtio_is_big_endian(current_cpu)) {
         return VIRTIO_DEVICE_ENDIAN_BIG;
     } else {
         return VIRTIO_DEVICE_ENDIAN_LITTLE;