xen_preinit() runs early and changes DebugOutputPort. qemu_preinit() runs
soon after. inb on DebugOutputPort doesn't work on Xen, so the check
will always fail and DebugOutputPort will be cleared to 0 disabling
output.
Quick exit the function when running on Xen to preserve the modified
DebugOutputPort.
Signed-off-by: Jason Andryuk <jandr...@gmail.com>
v2
Re-word comment
---
src/hw/serialio.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/hw/serialio.c b/src/hw/serialio.c
index 3163344..fa663b9 100644
--- a/src/hw/serialio.c
+++ b/src/hw/serialio.c
@@ -106,6 +106,10 @@ u16 DebugOutputPort VARFSEG = 0x402;
void
qemu_debug_preinit(void)
{
+ /* Xen doesn't support checking if debug output is active. */
+ if (runningOnXen())
+ return;
+
/* Check if the QEMU debug output port is active */
if (CONFIG_DEBUG_IO &&
inb(GET_GLOBAL(DebugOutputPort)) != QEMU_DEBUGCON_READBACK)
--
2.25.1
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