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[RFC,v2,27/49] vga: do not use virtual clock for blinking cursor

Message ID 20140717110430.8352.51279.stgit@PASHA-ISP
State New
Headers show

Commit Message

Pavel Dovgalyuk July 17, 2014, 11:04 a.m. UTC
This patch changes virtual clock to realtime one in vga_draw_text and
vga_update_display functions. Display update process depends on realtime
clock. If we read virtual clock there, virtual machine becomes
non-deterministic, because every read to virtual clock is written to the
replay log.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
---
 hw/display/vga.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/hw/display/vga.c b/hw/display/vga.c
index 4b089a3..02d3be3 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -1304,7 +1304,7 @@  static void vga_draw_text(VGACommonState *s, int full_update)
     uint32_t *ch_attr_ptr;
     vga_draw_glyph8_func *vga_draw_glyph8;
     vga_draw_glyph9_func *vga_draw_glyph9;
-    int64_t now = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
+    int64_t now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
 
     /* compute font data address (in plane 2) */
     v = s->sr[VGA_SEQ_CHARACTER_MAP];
@@ -1906,7 +1906,7 @@  static void vga_update_display(void *opaque)
         }
         if (graphic_mode != s->graphic_mode) {
             s->graphic_mode = graphic_mode;
-            s->cursor_blink_time = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
+            s->cursor_blink_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
             full_update = 1;
         }
         switch(graphic_mode) {