g364fb: use RAM memory region for framebuffer

Since the migration stream is already broken, we can use this opportunity to
change the framebuffer so that it is migrated as a RAM memory region rather
than as an array of bytes.

In particular this helps the output of the analyze-migration.py tool which
no longer contains a huge array representing the framebuffer contents.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210625163554.14879-2-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

hw/display/g364fb.c

@@ -22,6 +22,7 @@
 #include "hw/hw.h"
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
+#include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "ui/console.h"
@@ -33,7 +34,6 @@
 
 typedef struct G364State {
     /* hardware */
-    uint8_t *vram;
     uint32_t vram_size;
     qemu_irq irq;
     MemoryRegion mem_vram;
@@ -125,7 +125,7 @@ static void g364fb_draw_graphic8(G364State *s)
         xcursor = ycursor = -65;
     }
 
-    vram = s->vram + s->top_of_screen;
+    vram = memory_region_get_ram_ptr(&s->mem_vram) + s->top_of_screen;
     /* XXX: out of range in vram? */
     data_display = dd = surface_data(surface);
     snap = memory_region_snapshot_and_clear_dirty(&s->mem_vram, 0, s->vram_size,
@@ -274,6 +274,8 @@ static inline void g364fb_invalidate_display(void *opaque)
 
 static void g364fb_reset(G364State *s)
 {
+    uint8_t *vram = memory_region_get_ram_ptr(&s->mem_vram);
+
     qemu_irq_lower(s->irq);
 
     memset(s->color_palette, 0, sizeof(s->color_palette));
@@ -283,7 +285,7 @@ static void g364fb_reset(G364State *s)
     s->ctla = 0;
     s->top_of_screen = 0;
     s->width = s->height = 0;
-    memset(s->vram, 0, s->vram_size);
+    memset(vram, 0, s->vram_size);
     g364fb_invalidate_display(s);
 }
 
@@ -450,11 +452,10 @@ static int g364fb_post_load(void *opaque, int version_id)
 
 static const VMStateDescription vmstate_g364fb = {
     .name = "g364fb",
-    .version_id = 1,
-    .minimum_version_id = 1,
+    .version_id = 2,
+    .minimum_version_id = 2,
     .post_load = g364fb_post_load,
     .fields = (VMStateField[]) {
-        VMSTATE_VBUFFER_UINT32(vram, G364State, 1, NULL, vram_size),
         VMSTATE_BUFFER_UNSAFE(color_palette, G364State, 0, 256 * 3),
         VMSTATE_BUFFER_UNSAFE(cursor_palette, G364State, 0, 9),
         VMSTATE_UINT16_ARRAY(cursor, G364State, 512),
@@ -474,15 +475,12 @@ static const GraphicHwOps g364fb_ops = {
 
 static void g364fb_init(DeviceState *dev, G364State *s)
 {
-    s->vram = g_malloc0(s->vram_size);
-
     s->con = graphic_console_init(dev, 0, &g364fb_ops, s);
 
     memory_region_init_io(&s->mem_ctrl, OBJECT(dev), &g364fb_ctrl_ops, s,
                           "ctrl", 0x180000);
-    memory_region_init_ram_ptr(&s->mem_vram, NULL, "vram",
-                               s->vram_size, s->vram);
-    vmstate_register_ram(&s->mem_vram, dev);
+    memory_region_init_ram(&s->mem_vram, NULL, "g364fb.vram", s->vram_size,
+                           &error_fatal);
     memory_region_set_log(&s->mem_vram, true, DIRTY_MEMORY_VGA);
 }