vga: cleanup mapping of VRAM for non-PCI VGA

vga_init_vbe is now used only from ISA VGA cards.  Since the alias is
not needed anymore, remove it (effectively reverting commit 8294a64d7f,
"vga: fix vram double-mapping with -vga std and -M pc-0.12", 2012-05-29)
and the now unused vbe_mapped field of VGACommonState.  The function now
consists of a single memory_region_add_subregion call, so we can inline
it; this avoids incorrect usage from PCI cards.

Suggested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Based-on: <05af415a-5058-98b4-4a12-9d093a30b1e3@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

4 files changed, 7 insertions, 17 deletions

diff --git a/hw/display/vga-isa-mm.c b/hw/display/vga-isa-mm.c
index e9c43e5..7321b7a 100644
--- a/hw/display/vga-isa-mm.c
+++ b/hw/display/vga-isa-mm.c
@@ -106,6 +106,9 @@ int isa_vga_mm_init(hwaddr vram_base,
 
     s->vga.con = graphic_console_init(NULL, 0, s->vga.hw_ops, s);
 
-    vga_init_vbe(&s->vga, NULL, address_space);
+    memory_region_add_subregion(address_space,
+                                VBE_DISPI_LFB_PHYSICAL_ADDRESS,
+                                &s->vga.vram);
+
     return 0;
 }
diff --git a/hw/display/vga-isa.c b/hw/display/vga-isa.c
index 873e5e9..08a2730 100644
--- a/hw/display/vga-isa.c
+++ b/hw/display/vga-isa.c
@@ -76,7 +76,9 @@ static void vga_isa_realizefn(DeviceState *dev, Error **errp)
     memory_region_set_coalescing(vga_io_memory);
     s->con = graphic_console_init(DEVICE(dev), 0, s->hw_ops, s);
 
-    vga_init_vbe(s, OBJECT(dev), isa_address_space(isadev));
+    memory_region_add_subregion(isa_address_space(isadev),
+                                VBE_DISPI_LFB_PHYSICAL_ADDRESS,
+                                &s->vram);
     /* ROM BIOS */
     rom_add_vga(VGABIOS_FILENAME);
 }
diff --git a/hw/display/vga.c b/hw/display/vga.c
index 636586a..061fd9a 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -2301,15 +2301,3 @@ void vga_init(VGACommonState *s, Object *obj, MemoryRegion *address_space,
         portio_list_add(&s->vbe_port_list, address_space_io, 0x1ce);
     }
 }
-
-void vga_init_vbe(VGACommonState *s, Object *obj, MemoryRegion *system_memory)
-{
-    /* Use an alias to avoid double-mapping the same region */
-    memory_region_init_alias(&s->vram_vbe, obj, "vram.vbe",
-                             &s->vram, 0, memory_region_size(&s->vram));
-    /* XXX: use optimized standard vga accesses */
-    memory_region_add_subregion(system_memory,
-                                VBE_DISPI_LFB_PHYSICAL_ADDRESS,
-                                &s->vram_vbe);
-    s->vbe_mapped = 1;
-}
diff --git a/hw/display/vga_int.h b/hw/display/vga_int.h
index 55c418e..847e784 100644
--- a/hw/display/vga_int.h
+++ b/hw/display/vga_int.h
@@ -60,7 +60,6 @@ typedef struct VGACommonState {
     MemoryRegion *legacy_address_space;
     uint8_t *vram_ptr;
     MemoryRegion vram;
-    MemoryRegion vram_vbe;
     uint32_t vram_size;
     uint32_t vram_size_mb; /* property */
     uint32_t vbe_size;
@@ -106,7 +105,6 @@ typedef struct VGACommonState {
     uint32_t vbe_start_addr;
     uint32_t vbe_line_offset;
     uint32_t vbe_bank_mask;
-    int vbe_mapped;
     /* display refresh support */
     QemuConsole *con;
     uint32_t font_offsets[2];
@@ -178,7 +176,6 @@ void vga_invalidate_scanlines(VGACommonState *s, int y1, int y2);
 
 int vga_ioport_invalid(VGACommonState *s, uint32_t addr);
 
-void vga_init_vbe(VGACommonState *s, Object *obj, MemoryRegion *address_space);
 uint32_t vbe_ioport_read_data(void *opaque, uint32_t addr);
 void vbe_ioport_write_index(void *opaque, uint32_t addr, uint32_t val);
 void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val);