Maximum number of Serial Port available for a VM

[Toushin]

Hello.
Please correct me If I am wrong, but is it only possible to add 4 serial ports to a VM? (0-3)

If so, Is there a reason why only 4 serial ports can be added to a VM and more importantly, Is there a way to increase the number of the available serial ports?


Thanks!

 

[wolfgang]

Hi

you can add extra ports with args: in your config.
args: is raw qemu commands.
see

man qemu 
qm help set

 

[Toushin]

Hi Wolfgang,

Sorry, just a newbie in Proxmox, can you be specific?
Example I will be needing to have nine (9) /dev/ttyUSB* pass through to a VM, Is it possible?

Are you referring to:
serial[n]: (/dev/.+|socket)
Create a serial device inside the VM (n is 0 to 3), and pass through a host serial device (i.e. /dev/ttyS0)

I have tried this command and can only set up to 4 serial pass through.


Thanks!

 

[LnxBil]

Example I will be needing to have nine (9) /dev/ttyUSB* pass through to a VM, Is it possible?

In case of the USB serial adapters, you can just passthrough the USB devices via the GUI, have you tried that?

 

[Toushin]

Hi LnxBil,

No, I have not tried that. I am actually migrating a Linux SMS gateway system to Proxmox VM, wherein the USB serial devices have persistent names (symlink) using udev rules. The udev rules are configured in the Proxmox server and the symlinked device names are the ones passed through the VMS - it's actually working pretty good except I have nine GSM modems to work with.

 

[netwebdave]

Hi

you can add extra ports with args: in your config.
args: is raw qemu commands.
see

man qemu
qm help set

Hello - I am trying to do this with virtualized serial ports. So far, I haven't been able to see an output from args. Here's what I put in the config. Any help is appreciated. I need to get up to 15 virtual serial ports. I haven't been able to find much on the args format.

args: -serial tcp:localhost:6001,server,nowaitargs: -serial tcp:localhost:6002,server,nowait