diff options
| author | Dennis Wölfing <denniswoelfing@gmx.de> | 2021-06-07 13:53:03 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2021-06-15 07:11:03 +0200 |
| commit | 05ece98f965997649b8d922d224240459bcc1403 (patch) | |
| tree | b4c00b5b559a2a3be02a36309397d1a0dd554bc3 | |
| parent | 1ea06abceec61b6f3ab33dadb0510b6e09fb61e2 (diff) | |
| download | qemu-05ece98f965997649b8d922d224240459bcc1403.zip qemu-05ece98f965997649b8d922d224240459bcc1403.tar.gz qemu-05ece98f965997649b8d922d224240459bcc1403.tar.bz2 | |
vga: Allow writing VBE_DISPI_ID5 to ID register
The highest VBE_DISPI_INDEX_ID version supported by QEMU is
VBE_DISPI_ID5. But currently QEMU only allows writing values up to
VBE_DISPI_ID4 to the VBE_DISPI_INDEX_ID register.
As a result of this when a lower version is written to this register and
later VBE_DISPI_ID5 is written back, reads from the register will
continue to report the lower version.
Indeed SeaBIOS is doing that during VGA initialization which causes
guests to always read VBE_DISPI_ID0 instead of the correct version.
Signed-off-by: Dennis Wölfing <denniswoelfing@gmx.de>
Message-Id: <20210607115303.228659-1-denniswoelfing@gmx.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
| -rw-r--r-- | hw/display/vga.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/hw/display/vga.c b/hw/display/vga.c index 28a90e3..9d1f66a 100644 --- a/hw/display/vga.c +++ b/hw/display/vga.c @@ -752,7 +752,8 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val) val == VBE_DISPI_ID1 || val == VBE_DISPI_ID2 || val == VBE_DISPI_ID3 || - val == VBE_DISPI_ID4) { + val == VBE_DISPI_ID4 || + val == VBE_DISPI_ID5) { s->vbe_regs[s->vbe_index] = val; } break; |