[Qemu-devel] [PATCH 1/2] vga: abort instead of shrinking memory

["Radim Krčmář" <rkrcmar@redhat.com>]

Automatic shrinking of vram_size leads to a segfault, because other
variables depend on being smaller and don't get shrinked.

Implications of shrinking would make the code needlessly complicated;
assert instead.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
 hw/display/vga.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/hw/display/vga.c b/hw/display/vga.c
index 9c62fbf48823..a09dd19a6042 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -2122,13 +2122,9 @@ void vga_common_init(VGACommonState *s, Object *obj, bool global_vmstate)
         expand4to8[i] = v;
     }
 
-    /* valid range: 1 MB -> 256 MB */
-    s->vram_size = 1024 * 1024;
-    while (s->vram_size < (s->vram_size_mb << 20) &&
-           s->vram_size < (256 << 20)) {
-        s->vram_size <<= 1;
-    }
-    s->vram_size_mb = s->vram_size >> 20;
+    assert(1 <= s->vram_size_mb && s->vram_size_mb <= 256);
+
+    s->vram_size = s->vram_size_mb << 20;
     if (!s->vbe_size) {
         s->vbe_size = s->vram_size;
     }
-- 
2.3.0