[Qemu-devel] [PATCH 02/29] vmsvga: Group together commands by their handling

[Liran Alon <liran.alon@oracle.com>]

From: Leonid Shatz <leonid.shatz@oracle.com>

Should not change semantics.

Signed-off-by: Leonid Shatz <leonid.shatz@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
---
 hw/display/vmware_vga.c | 60 ++++++++++++++++++++++++++++---------------------
 1 file changed, 34 insertions(+), 26 deletions(-)

diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
index 60a672530840..f8c5b64cfd7c 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -607,6 +607,8 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s)
         cmd_start = s->fifo_stop;
 
         switch (cmd = vmsvga_fifo_read(s)) {
+
+        /* Implemented commands */
         case SVGA_CMD_UPDATE:
         case SVGA_CMD_UPDATE_VERBOSE:
             len -= 5;
@@ -621,25 +623,6 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s)
             vmsvga_update_rect_delayed(s, x, y, width, height);
             break;
 
-        case SVGA_CMD_RECT_FILL:
-            len -= 6;
-            if (len < 0) {
-                goto rewind;
-            }
-
-            colour = vmsvga_fifo_read(s);
-            x = vmsvga_fifo_read(s);
-            y = vmsvga_fifo_read(s);
-            width = vmsvga_fifo_read(s);
-            height = vmsvga_fifo_read(s);
-#ifdef HW_FILL_ACCEL
-            if (vmsvga_fill_rect(s, colour, x, y, width, height) == 0) {
-                break;
-            }
-#endif
-            args = 0;
-            goto badcmd;
-
         case SVGA_CMD_RECT_COPY:
             len -= 7;
             if (len < 0) {
@@ -704,27 +687,52 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s)
 #endif
 
         /*
-         * Other commands that we at least know the number of arguments
-         * for so we can avoid FIFO desync if driver uses them illegally.
+         * Deprecated commands are neither documented in VMware SVGA development kit
+         * nor in Linux kernel vmware-svga driver source code.
+         * If they are not encountered in real world scenarious, they should be
+         * completely removed.
          */
-        case SVGA_CMD_DEFINE_ALPHA_CURSOR:
+        case SVGA_CMD_RECT_FILL:
             len -= 6;
             if (len < 0) {
                 goto rewind;
             }
-            vmsvga_fifo_read(s);
-            vmsvga_fifo_read(s);
-            vmsvga_fifo_read(s);
+
+            colour = vmsvga_fifo_read(s);
             x = vmsvga_fifo_read(s);
             y = vmsvga_fifo_read(s);
-            args = x * y;
+            width = vmsvga_fifo_read(s);
+            height = vmsvga_fifo_read(s);
+#ifdef HW_FILL_ACCEL
+            if (vmsvga_fill_rect(s, colour, x, y, width, height) == 0) {
+                break;
+            }
+#endif
+            args = 0;
             goto badcmd;
+
+        /*
+         * Unimplemented commands that we gracefully skip their
+         * arguments so we can avoid FIFO desync
+         */
         case SVGA_CMD_RECT_ROP_FILL:
             args = 6;
             goto badcmd;
         case SVGA_CMD_RECT_ROP_COPY:
             args = 7;
             goto badcmd;
+        case SVGA_CMD_DEFINE_ALPHA_CURSOR:
+            len -= 6;
+            if (len < 0) {
+                goto rewind;
+            }
+            vmsvga_fifo_read(s);
+            vmsvga_fifo_read(s);
+            vmsvga_fifo_read(s);
+            x = vmsvga_fifo_read(s);
+            y = vmsvga_fifo_read(s);
+            args = x * y;
+            goto badcmd;
         case SVGA_CMD_DRAW_GLYPH_CLIPPED:
             len -= 4;
             if (len < 0) {
-- 
1.9.1