[SOLVED] How to pass host machine serial port to VM?

[ahmeterol]

Hello,

In our host system, there is serial port used for communication with other devices. We are not using it serial port as console. We want to able reach this serial port from VM, but could not figure out how to do it. All the forum posts are related to console.

Here is the serial device /dev/ttyS0 that we want to pass to VM.

root@proxmox1:~# dmesg | grep tty
[    0.000000] printk: console [tty0] enabled
[    0.713419] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A

I used qm set command to add serial port to VM(ID=103)

qm set 103 -serial1 /dev/ttyS0

stopped the VM and started again. However, at the startup it gives the following error.

unable to find a serial interface

Here is details of device.

root@proxmox1:~# ls -l /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 Nov 26 00:45 /dev/ttyS0

Any help is very appreciated.

 

[ahmeterol]

Hello again, i searched all Google sites and forums. Still could not find solution.
Any help is crucial for us

 

[ahmeterol]

I finally figure that out, even if it gives the error "unable to find a serial interface" in console, VM is just working fine. You can connect the VMs with noVNC option.