Spinning up the vm with /dev/nmdm* and connecting with cu -l is not an
issue on my end.
I am trying to create a vm using freebsd cloud image and connect to
guest OS terminal with virtio-console and socat(no X11).
When spawning the vm the unix socket indeed is created, however when I
connect to it with socat nothing is being shown(not actions on any
terminal commands as well).
Also, I noticed there is a kernel module(virtio_console.ko) and
apparently I believe it has to be loaded it, not sure here.
Please advise,
On 2/14/25 17:23, Paul Vixie wrote:
if you want to use cu, you have to use -l to map guest com1 to some host nmdm
device. if you want to use virtio-console, it will create unix domain sockets
not pseudo tty endpoints. from bhyve(8) we see:
Virtio console device backends:
•
port1=/path/to/port1.sock[,portN=/path/to/port2.sock ...]
A maximum of 16 ports per device can be created. Every
port
is named and corresponds to a Unix domain socket created by
bhyve. bhyve accepts at most one connection per port at a
time.
Limitations:
• Due to lack of destructors in bhyve, sockets on the
filesystem must be cleaned up manually after bhyve
exits.
• There is no way to use the “console port” feature, nor
the console port resize at present.
• Emergency write is advertised, but no-op at present.
i know of no host-side client which will connect to these unix domain sockets
and offer a cu-like user interface. "unidirectional" may be the experience
you'll get from "socat".
if what you're trying to accomplish is a graphical console, virtio-console is
not the way to do it. rather, you'll want "fbuf" to create a guest VGA/similar
that gateways to a host VNC.
re:
On Friday, February 14, 2025 9:55:23 PM UTC Petru Garstea wrote:
I tried with the following command, and got the same result.
*/usr/sbin/bhyve -H -P -A -c 1 -m 1500M \
-s 0,hostbridge \
-s 6,virtio-console,0=/tmp/vtcon.0 \
-s 31,lpc \
-l bootrom,/tmp/BHYVE_UEFI.fd \
-s 1,virtio-blk,/tmp/fbsd.img \
-s 2,virtio-net,tap0 \
tmp*
I also able to connect but the bidirectional connection is not happening
*socat - UNIX-CONNECT:/tmp/vtcon.0
ls
*
PS: if I use null modem emulation instead virtio-console, then
connecting with cu is not an issue.
any ideas ?
Thanks
On 2/14/25 14:57, Michael Gmelin wrote:
On Fri, 14 Feb 2025 14:21:07 -0500
Petru Garstea<peter.garsh...@ambient-md.com> wrote:
Hi,
I am trying to configure bhyve vm with support of virtio-console, the
following option is added to bhyve command line
*-s 3,virtio-console,port1=/test/console.sock
*However when trying to connect to socket with socat trere are no
input/ouptut is observed.
Has virtio-console ever worked ?
Yes it works, I just tried it using sysutils/vm-bhyve (just add
virt_console0="Yes" to the configuration file).
Based on the logs, these device settings are used by it:
bhyve devices:
-s 0,hostbridge \
-s 31,lpc \
-s 4:0,virtio-blk,/dev/zvol/zroot/vms/freebsd14-test/disk0 \
-s 5:0,virtio-net,tap0,mac=58:9c:fc:aa:aa:aa \
-s 6:0,virtio-console,0=/vms/freebsd14-test/vtcon.0
I could connect to /vms/freebsd14-test/vtcon.0 using socat:
socat - UNIX-CONNECT:/vms/freebsd14-test/vtcon.0
Inside the vm it's /dev/vtcon/0.
-m
