Oh, never mind. I discovered that everything could be configured using virt-manager. Problem solved. Thanks a lot for your help! On Mon, 14 Mar 2016 22:34:49 +0300 Aleksander Alekseev <afiskon@xxxxxxxxx> wrote: > > Yes, > > > > qemu is connecting the serial port to a FIFO, and qemu is resident > > even after host reboot. > > > > In fact, even if you'll kill the qemu process and restart it with > > the same FIFO, it should still work. > > > > Please try it, and report if it indeed worked for you. > > Frankly I'm still having some problems. But let me tell you a full > story first. > > I have Ubuntu 14.04 LTS installed on my laptop Fujitsu Lifebook E733. > I created two VMs with FreeBSD 11.0 CURRENT. What I'm trying to do is > to debug a FreeBSD kernel using kgdb, thus I need two systems > connected via serial port. > > Unfortunately using mkfifo as you described above didn't work. Right > solution was found here: > > http://blog.bauermann.eng.br/2013/09/04/connecting-qemukvm-virtual-machines-via-serial-port/ > > Now when I start VMs: > > sudo kvm -hda /path/to/freebsd11.img \ > -serial pipe:/path/to/null-cable-1 > sudo kvm -hda /path/to/freebsd11kgdb.img \ > -serial pipe:/path/to/null-cable-2 > > ... serial port (/dev/cuau0) is seen in both VMs. Then I edited > /boot/device.hints on freebsd11 VM like this: > > hint.uart.0.flags="0x90" > > ..., restarted this VM, entered boot prompt (by pressing 3 in boot > menu), and typed: > > boot kernel -d > > This command boots kernel in debug mode. In DDB prompt I typed: > > gdb > > Now system awaits connection from 2nd system by serial port. Here is > how to do this: > > su > cd /usr/src > sudo kgdb -r /dev/cuau0 /boot/kernel/kernel > > Good news is --- it works! > > http://i.imgur.com/bP8uioX.png > > But I don't have a network connection and other stuff I configured > using `virsh`. So I tried `virsh edit MVNAME` as described here: > > http://blog.vmsplice.net/2011/04/how-to-pass-qemu-command-line-options.html > > Unfortunately now when I start VM I got an error: > > ``` > eax@fujitsu:~$ sudo virsh start freebsd11 > > error: Failed to start domain freebsd11 > error: internal error: process exited while connecting to monitor: > qemu-system-x86_64: -serial pipe:/var/lib/libvirt/pipes/null-cable-1: > Failed to create chardev qemu: could not connect serial device to > character backend 'pipe:/var/lib/libvirt/pipes/null-cable-1' > ``` > > Here is a full `sudo virsh dumpxml freebsd11` output: > > http://paste.ubuntu.com/15386277/ > > Here is part of /var/log/libvirt/qemu/freebsd11.log, which contains > long KVM command executed by virsh: > > http://paste.ubuntu.com/15386302/ > > And here is how `sudo strace virsh start freebsd11` looks like: > > http://paste.ubuntu.com/15386306/ > > Any ideas how to solve this issue? Naturally if there is any other > debug information you need I will be happy to provide it. > > > Best regards, > Aleksander Alekseev > http://eax.me/ > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Best regards, Aleksander Alekseev http://eax.me/ -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
