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hw/display/vga: Report a proper error when adding a 2nd ISA VGA 

QEMU currently abort()s if the user tries to add a second ISA VGA
device, for example:

$ ./qemu-system-x86_64 -device isa-vga -device isa-vga
RAMBlock "vga.vram" already registered, abort!
Aborted (core dumped)
$ ./qemu-system-x86_64 -device isa-cirrus-vga -device isa-cirrus-vga
RAMBlock "vga.vram" already registered, abort!
Aborted (core dumped)
$ ./qemu-system-mips64el -M pica61 -device isa-vga
RAMBlock "vga.vram" already registered, abort!
Aborted (core dumped)

Such a crash should never happen just because of giving bad parameters
at the command line. Let's return a proper error message instead.
(The idea is based on an original patch by Jose R. Ziviani for the
isa-vga device, but this now fixes it for the isa-cirrus-vga device, too)

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/44
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220317083027.16688-4-thuth@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Thomas Huth 2022-03-17 09:30:26 +01:00 committed by Gerd Hoffmann
parent 6832deb8ff
commit 9eb840a209
1 changed files with 6 additions and 0 deletions
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6
hw/display/vga.c
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@ -2206,6 +2206,12 @@ bool vga_common_init(VGACommonState *s, Object *obj, Error **errp)
s->vbe_size_mask = s->vbe_size - 1;
s->is_vbe_vmstate = 1;
if (s->global_vmstate && qemu_ram_block_by_name("vga.vram")) {
error_setg(errp, "Only one global VGA device can be used at a time");
return false;
}
memory_region_init_ram_nomigrate(&s->vram, obj, "vga.vram", s->vram_size,
&local_err);
if (local_err) {