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authorDennis Wölfing <denniswoelfing@gmx.de>2021-06-07 13:53:03 +0200
committerGerd Hoffmann <kraxel@redhat.com>2021-06-15 07:11:03 +0200
commit05ece98f965997649b8d922d224240459bcc1403 (patch)
treeb4c00b5b559a2a3be02a36309397d1a0dd554bc3 /hw
parent1ea06abceec61b6f3ab33dadb0510b6e09fb61e2 (diff)
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>
Diffstat (limited to 'hw')
-rw-r--r--hw/display/vga.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/hw/display/vga.c b/hw/display/vga.c
index 28a90e30d0..9d1f66af40 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;