From: Prasad J Pandit <p...@fedoraproject.org>
Port 92 configuration register holds an 8-bit value. Of 8-bits,
bits 0-1 are used and 2-7 are reserved. Restrict the supplied
value to 2 bits.
Reported-by: Niu Guoxiang <niuguoxi...@huawei.com>
Signed-off-by: Prasad J Pandit <p...@fedoraproject.org>
---
hw/i386/pc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 05985d4927..883384a599 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -515,6 +515,7 @@ static void port92_write(void *opaque, hwaddr addr,
uint64_t val,
Port92State *s = opaque;
int oldval = s->outport;
+ val &= 0x03;
DPRINTF("port92: write 0x%02" PRIx64 "\n", val);
s->outport = val;
qemu_set_irq(s->a20_out, (val >> 1) & 1);
--
2.13.6
