vbe: make bochs dispi interface return the correct memory size with qxl

VgaState->vram_size is the size of the pci bar.  In case of qxl not the
whole pci bar can be used as vga framebuffer.  Add a new variable
vbe_size to handle that case.  By default (if unset) it equals
vram_size, but qxl can set vbe_size to something else.

This makes sure VBE_DISPI_INDEX_VIDEO_MEMORY_64K returns correct results
and sanity checks are done with the correct size too.

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/hw/display/vga.c b/hw/display/vga.c
index 65dab8dbed..99251d7698 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -610,7 +610,7 @@ uint32_t vbe_ioport_read_data(void *opaque, uint32_t addr)
             val = s->vbe_regs[s->vbe_index];
         }
     } else if (s->vbe_index == VBE_DISPI_INDEX_VIDEO_MEMORY_64K) {
-        val = s->vram_size / (64 * 1024);
+        val = s->vbe_size / (64 * 1024);
     } else {
         val = 0;
     }
@@ -749,7 +749,7 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
                     line_offset = w >> 1;
                 else
                     line_offset = w * ((s->vbe_regs[VBE_DISPI_INDEX_BPP] + 7) >> 3);
-                h = s->vram_size / line_offset;
+                h = s->vbe_size / line_offset;
                 /* XXX: support weird bochs semantics ? */
                 if (h < s->vbe_regs[VBE_DISPI_INDEX_YRES])
                     return;
@@ -2285,6 +2285,9 @@ void vga_common_init(VGACommonState *s, Object *obj, bool global_vmstate)
         s->vram_size <<= 1;
     }
     s->vram_size_mb = s->vram_size >> 20;
+    if (!s->vbe_size) {
+        s->vbe_size = s->vram_size;
+    }
 
     s->is_vbe_vmstate = 1;
     memory_region_init_ram(&s->vram, obj, "vga.vram", s->vram_size);