George writes:
> Hi guys, > > I apologize if this maybe out of topic even though it is truly related > to VMM than Debian. > > I am trying to setup a VMM Debian based guest but I'm not able to get > it to work. I found some description on the web about which settings > to edit in grub.cfg to enable the serial console and created a VM with > 10.3 in qcow2 disk format in KVM. Now I am trying to start the same on > OpenBSD 6.7 but keep getting the connected message and then just > "Rebooting " after I hit some keyboard keys seems like baud rate issue > but not sure. Not baudrate related, but there are some known issues in OpenBSD 6.7 related to the emulated uart device in vmd(8). (I have a patch if you follow -current[1] that fixes stability issues.) My advice is to install using vmm(4)/vmd(8) and not migrate an image from KVM. I believe Debian started including the virtio cdrom drivers finally...but, if not, google for some guides on adding those to the iso. Make sure you install OpenSSH and rely on ssh(1) connections to the guest. As soon as you can, modify the grub defaults in /etc/default/grub and set the GRUB_CMDLINE_LINUX_DEFAULT to include: tsc=reliable tsc=noirqtime console=ttyS0,115200 Make sure to run update-grub afterwards. You'll probably have a bad time with your clock, though Debian use a 4.x kernel, so it won't be too bad and may manage using tsc as a clocksource. Otherwise expect refined-jiffies as the clocksource and it may run at a rate of 50% of host time. I recommend you also build and install my Linux clone of vmmci(4)[2] within the Debian guest if you want safe guest shutdowns. > > After messing with it for a while now I am getting a new error: > > vmctl: could not open disk image(s) > > even thought the disk is there and readable to the user I have setup > in vm.conf in fact I have another VM with the same configuration and > disk with the same permissions and in the same location that works (it > is OpenBSD based). Use top(1) showing threads and command line args: top -C -g vmd Chances are you have a lingering vmd(8) process for the Debian guest using the disk. Kill -9 the one with the vm name. > > I would greatly appreciate it if someone has gone this path and can > share some config info with me. > > Cheers and thanks in advance, > > George [1] https://sisu.io/patches/vmd-thread-safety-07062020-v1.patch [2] https://github.com/voutilad/virtio_vmmci -Dave
