Old versions of the BOCHs VGA BIOS (cira 2003) made use of VBE registers at 0xff80/81. In VBE API version 0xb0c2 these were moved to 0x1ce/cf. Unfortunately, QEMU still registers handlers for the old range. If a guest attempts to assign an I/O device overlapping this region, QEMU exits with a hw_error. Windows guests seem to like to assign I/O devices to the high end of the address space, so it's pretty easy to hot add an rtl8139 to a Win2k8 guest and trigger the bug. I can't find any reason to register these handlers, so let's remove the cruft.
Signed-off-by: Alex Williamson <alex.william...@redhat.com> --- hw/vga.c | 7 ------- 1 files changed, 0 insertions(+), 7 deletions(-) diff --git a/hw/vga.c b/hw/vga.c index b5c7ee7..966185e 100644 --- a/hw/vga.c +++ b/hw/vga.c @@ -2313,13 +2313,6 @@ void vga_init(VGACommonState *s) register_ioport_write(0x1ce, 1, 2, vbe_ioport_write_index, s); register_ioport_write(0x1cf, 1, 2, vbe_ioport_write_data, s); - - /* old Bochs IO ports */ - register_ioport_read(0xff80, 1, 2, vbe_ioport_read_index, s); - register_ioport_read(0xff81, 1, 2, vbe_ioport_read_data, s); - - register_ioport_write(0xff80, 1, 2, vbe_ioport_write_index, s); - register_ioport_write(0xff81, 1, 2, vbe_ioport_write_data, s); #else register_ioport_read(0x1ce, 1, 2, vbe_ioport_read_index, s); register_ioport_read(0x1d0, 1, 2, vbe_ioport_read_data, s);