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vga: fix vram double-mapping with -vga std and -M pc-0.12 

With pc-0.12, we map the video RAM both through the PCI BAR (the guest does
this) and through a fixed mapping at 0xe0000000.  The memory API doesn't allow
this double map, and aborts.

Fix by using an alias.

Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2012-05-09 18:23:06 +03:00 committed by Anthony Liguori
parent 1c4ad9d2b4
commit 8294a64d7f
2 changed files with 7 additions and 1 deletions
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7
hw/vga.c
View File

@ -2357,10 +2357,15 @@ void vga_init(VGACommonState *s, MemoryRegion *address_space,
void vga_init_vbe(VGACommonState *s, MemoryRegion *system_memory)
{
#ifdef CONFIG_BOCHS_VBE
/* With pc-0.12 and below we map both the PCI BAR and the fixed VBE region,
* so use an alias to avoid double-mapping the same region.
*/
memory_region_init_alias(&s->vram_vbe, "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);
&s->vram_vbe);
s->vbe_mapped = 1;
#endif
}

1
hw/vga_int.h
View File

@ -105,6 +105,7 @@ typedef struct VGACommonState {
MemoryRegion *legacy_address_space;
uint8_t *vram_ptr;
MemoryRegion vram;
MemoryRegion vram_vbe;
uint32_t vram_size;
uint32_t latch;
MemoryRegion *chain4_alias;