[Bug]: VirtoIO breaks windbg connectivity for KDCOM to QEMU

[philgweber]

Is there an existing issue for this?

• I have searched existing issues

Current Behavior

All serial ports have been converted to virtio ports. KDCOM driver running on the device doesn't know how to communicate over VirtIO port. This causes windbg to stop functioning with this latest change.

In QemuRunner.py we need to have an flag to allow us to redirect STDIO to port passed in, where right now it is hard coded to None

        .with_serial_port(None, log_files=["secure_mm.log"])

Expected Behavior

        .with_serial_port(serial_port, log_files=["secure_mm.log"])

We need to be able to pass the serial_port option in to allow dbgeng for KDCOM to properly connect to windbg instance.

Steps To Reproduce

stuart_build -c Platforms/QemuArmVirtPkg/PlatformBuild.py --flashonly GDB_SERVER=5555 SERIAL_PORT=56789 TPM_DEV=$(TPM_DEV) PATH_TO_OS=$(PATH_TO_OS)

Start windbg with windbg -k com:ipport=56789,port=127.0.0.1 -v

Windbg will not connect.

Build Environment

- OS(s): Any
- Targets Impacted: ARM_VIRT

Version Information

8f1f2ff9339220c0ad3bd8708902106440e53ea9

Urgency

Medium

Are you going to fix this?

I will fix it

Do you need maintainer feedback?

No maintainer feedback needed

Anything else?

No response