Date: Fri, 14 Feb 2025 22:23:36 +0000 From: Paul Vixie <paul@redbarn.org> To: Michael Gmelin <grembo@freebsd.org>, virtualization@freebsd.org Cc: freebsd-virtualization@freebsd.org, Petru Garstea <peter.garshtja@ambient-md.com> Subject: Re: bhyve vm and virtio-console Message-ID: <3802339.MHq7AAxBmi@localhost> In-Reply-To: <5e1c08ca-4175-4a85-bc07-3ca73406454a@ambient-md.com> References: <2a0e1b92-4d63-4061-bc37-c5e72b8ef0ed@ambient-md.com> <20250214205752.6a12dbb4.grembo@freebsd.org> <5e1c08ca-4175-4a85-bc07-3ca73406454a@ambient-md.com>
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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.garshtja@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 -- Paul Vixie
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