hello,
On 2024-05-16 16:14, Claudio Jeker wrote:
> On Thu, May 16, 2024 at 10:00:20AM -0400, Johan Huldtgren wrote:
> > hello,
>
> Removed a lot of text to keep this under control.
>
> > > > > >> > Relevant configs:
> > > > > >> >
> > > > > >> > # host (OpenBSD 7.5 + syspatches)
> > > > > >> >
> > > > > >> > $ doas cat /etc/vm.conf
> > > > > >> > vm "guest.vm" {
> > > > > >> > disk "/home/vm/guest.img"
> > > > > >> > owner johan
> > > > > >> > memory 4G
> > > > > >> > local interface tap0
> > > > > >>
>
> This config uses 'local interface tap0' which runs the simple DHCP/BOOTP
> server inside of vmd(8). See vm.conf(5) for more info about this.
>
> > > > > >> Why are you using "local interface tap0" and then putting tap0 in a
> > > > > >> bridge(4) with a trunk(4)? I'm not an networking person but that
> > > > > >> seems
> > > > > >> odd to me.
> > > > > >
> > > > > > Entierly possible I'm doing this wrong. This is the only setup I
> > > > > > have
> > > > > > where I tried using local interface, everywhere else I define the
> > > > > > switch
> > > > > > so I probably just carried that part of the config over. I modified
> > > > > > it
> > > > > > to normalize my config so it's similar to all my others.
> > > > > >
> > > > > > $ doas cat /etc/vm.conf
> > > > > >
> > > > > > switch "uplink" {
> > > > > > interface bridge0
> > > > > > }
> > > > > >
> > > > > > vm "guest.vm" {
> > > > > > disk "/home/vm/gallery.img"
> > > > > > owner johan
> > > > > > memory 3.5G
> > > > > > interface tap0 {
> > > > > > switch "uplink"
> > > > > > }
> > > > > > }
>
> This config is not using 'local' and so vmd(8) does not intercept DHCP
> packets. Instead the expectation is that if you use DHCP that you run your
> own DHCP server somewhere.
>
> So to come back to this:
>
> > > I'm confused. You changed the config away from local dhcp intercept to
> > > using bridge0. So are you running a dhcp server on and interface connected
> > > to bridge0?
> >
> > I changed the config to be consistent with the examples in vm.conf and my
> > other setups. I'm not running any dhcp server myself just relaying on
> > whatever vmd provides.
>
> But you disabled the DHCP server from vmd in your new config. Instead you
> probably bridged the tap interface to your ethernet interface. If there is
> no other DHCP server around then the vm guest will never get a response.
> This is what the tcpdump shows.
>
> > > It seems there is an issue with the vmm internal dhcp (which is more
> > > bootp) server. So the debug output would be helpful for that case since
> > > there is an assumption that the dhcp packets are somehow lost.
> >
> > Would this require building a new kernel with VMD_DEBUG? Or would this be
> > turned on somewhere else?
>
> Change your config back to 'local interface tap0' and rerun vmd -dvv
> Then we may actually see what the vmd supplied DHCP server does.
Thank you very much for this explanation, I guess everywhere else I have
vmd there is a dhcp server around so it never occured to me. So vm.conf
has been updated:
$ doas cat /etc/vm.conf
vm "guest.vm" {
disk "/home/vm/gallery.img"
owner johan
memory 3.5G
local interface tap0
}
# $(which vmd) -dvv
vmd: startup
vmd: vm_register: registering vm 1
vmd: /etc/vm.conf:19: vm "guest.vm" registered (enabled)
warning: macro 'sets' not used
vmd: vmd_configure: setting staggered start configuration to parallelism: 4 and
delay: 30
vmd: vmd_configure: starting vms in staggered fashion
vmd: start_vm_batch: starting batch of 4 vms
vmd: vm_opentty: vm guest.vm tty /dev/ttyp1 uid 1000 gid 4 mode 620
vmd: start_vm_batch: done starting vms
vmm: config_getconfig: vmm retrieving config
vmm: vm_register: registering vm 1
control: config_getconfig: control retrieving config
agentx: config_getconfig: agentx retrieving config
priv: config_getconfig: priv retrieving config
vmd: vm_priv_ifconfig: interface tap0 description vm1-if0-guest.vm
vmd: vm_priv_ifconfig: interface tap0 address 100.64.1.2/31
vmd: started guest.vm (vm 1) successfully, tty /dev/ttyp1
vm/guest.vm: loadfile_bios: loaded BIOS image
vm/guest.vm: pic_set_elcr: setting level triggered mode for irq 3
vm/guest.vm: pic_set_elcr: setting level triggered mode for irq 5
vm/guest.vm: virtio_init: vm "guest.vm" vio0 lladdr fe:e1:bb:d1:2a:29, local
vm/guest.vm: pic_set_elcr: setting level triggered mode for irq 6
vm/guest.vm: guest.vm: launching vioblk0
vm/guest.vm: virtio_dev_launch: sending 'd' type device struct
vm/guest.vm: virtio_dev_launch: sending vm message for 'guest.vm'
vm/guest.vm/vioblk: vioblk_main: got viblk dev. num disk fds = 1, sync fd = 16,
async fd = 18, capacity = 0 seg_max = 126, vmm fd = 5
vm/guest.vm/vioblk0: vioblk_main: initialized vioblk0 with raw image
(capacity=83886080)
vm/guest.vm/vioblk0: vioblk_main: wiring in async vm event handler (fd=18)
vm/guest.vm/vioblk0: vm_device_pipe: initializing 'd' device pipe (fd=18)
vm/guest.vm/vioblk0: vioblk_main: wiring in sync channel handler (fd=16)
vm/guest.vm/vioblk0: vioblk_main: telling vm guest.vm device is ready
vm/guest.vm/vioblk0: vioblk_main: sending heartbeat
vm/guest.vm: virtio_dev_launch: receiving reply
vm/guest.vm: virtio_dev_launch: device reports ready via sync channel
vm/guest.vm: vm_device_pipe: initializing 'd' device pipe (fd=17)
vm/guest.vm: guest.vm: launching vionet0
vm/guest.vm: virtio_dev_launch: sending 'n' type device struct
vm/guest.vm: virtio_dev_launch: sending vm message for 'guest.vm'
vm/guest.vm/vionet: vionet_main: got vionet dev. tap fd = 8, syncfd = 16,
asyncfd = 19, vmm fd = 5
vm/guest.vm/vionet0: vionet_main: wiring in async vm event handler (fd=19)
vm/guest.vm/vionet0: vm_device_pipe: initializing 'n' device pipe (fd=19)
vm/guest.vm/vionet0: vionet_main: wiring in sync channel handler (fd=16)
vm/guest.vm/vionet0: vionet_main: telling vm guest.vm device is ready
vm/guest.vm/vionet0: vionet_main: sending async ready message
vm/guest.vm: virtio_dev_launch: receiving reply
vm/guest.vm: virtio_dev_launch: device reports ready via sync channel
vm/guest.vm: vm_device_pipe: initializing 'n' device pipe (fd=18)
vm/guest.vm: pic_set_elcr: setting level triggered mode for irq 7
vm/guest.vm: run_vm: starting 1 vcpu thread(s) for vm guest.vm
vm/guest.vm: vcpu_reset: resetting vcpu 0 for vm 10
vm/guest.vm: run_vm: waiting on events for VM guest.vm
vm/guest.vm: guest.vm: received tap addr fe:e1:ba:d0:78:97 for nic 0
vm/guest.vm: handle_dev_msg: device reports ready
vm/guest.vm: handle_dev_msg: device reports ready
vm/guest.vm/vionet0: dev_dispatch_vm: set hostmac
vm/guest.vm: vcpu_exit_fw_cfg: selector 0x0000
vm/guest.vm: vcpu_exit_fw_cfg: selector 0x0001
vm/guest.vm: fw_cfg_handle_dma: selector 0x0019
vm/guest.vm: fw_cfg_file_dir: file directory with 2 files
vm/guest.vm: 100B 0020 etc/e820
vm/guest.vm: 4B 0021 etc/screen-and-debug
vm/guest.vm: vcpu_exit_fw_cfg: selector 0x0020
vm/guest.vm: fw_cfg_select_file: accessing file etc/e820
vm/guest.vm: fw_cfg_handle_dma: selector 0x000d
vm/guest.vm: fw_cfg_select: unhandled selector d
vm/guest.vm: fw_cfg_handle_dma: selector 0x000f
vm/guest.vm: fw_cfg_select: unhandled selector f
vm/guest.vm: fw_cfg_handle_dma: selector 0x8000
vm/guest.vm: fw_cfg_select: unhandled selector 8000
vm/guest.vm: fw_cfg_handle_dma: selector 0x8001
vm/guest.vm: fw_cfg_select: unhandled selector 8001
vm/guest.vm: fw_cfg_handle_dma: selector 0x0019
vm/guest.vm: fw_cfg_file_dir: file directory with 2 files
vm/guest.vm: 100B 0020 etc/e820
vm/guest.vm: 4B 0021 etc/screen-and-debug
vm/guest.vm: fw_cfg_handle_dma: selector 0x0004
vm/guest.vm: i8259_write_datareg: master pic, reset IRQ vector to 0x8
vm/guest.vm: i8259_write_datareg: slave pic, reset IRQ vector to 0x70
vm/guest.vm: fw_cfg_handle_dma: selector 0x000f
vm/guest.vm: fw_cfg_select: unhandled selector f
vm/guest.vm: fw_cfg_handle_dma: selector 0x0005
vm/guest.vm: fw_cfg_select: unhandled selector 5
vm/guest.vm: fw_cfg_handle_dma: selector 0x0021
vm/guest.vm: fw_cfg_select_file: accessing file etc/screen-and-debug
vm/guest.vm: vcpu_process_com_lcr: set baudrate = 115200
vm/guest.vm: vcpu_process_com_lcr: set baudrate = 115200
vm/guest.vm: vcpu_process_com_lcr: set baudrate = 115200
vm/guest.vm: vcpu_process_com_lcr: set baudrate = 115200
vm/guest.vm: i8259_write_datareg: master pic, reset IRQ vector to 0x20
vm/guest.vm: i8259_write_datareg: slave pic, reset IRQ vector to 0x28
vm/guest.vm/vionet0: read_pipe_main: resetting virtio network device 0
vmd: vmd_dispatch_vmm: running vm: 1, vm_state: 0x1
vm/guest.vm: vcpu_process_com_lcr: set baudrate = 115200
vm/guest.vm: vcpu_exit_i8253_misc: counter 2 clear, returning 0x0
vm/guest.vm: vcpu_exit_i8253_misc: discarding data written to PIT misc port
vm/guest.vm: vcpu_exit_i8253_misc: counter 2 clear, returning 0x0
vm/guest.vm: vcpu_exit_i8253_misc: discarding data written to PIT misc port
vm/guest.vm: vcpu_exit_i8253_misc: counter 2 clear, returning 0x0
vm/guest.vm: vcpu_exit_eptviolation: fault already handled
vm/guest.vm: vcpu_exit_eptviolation: fault already handled
<snip>
vm/guest.vm/vionet0: read_pipe_main: resetting virtio network device 0
thanks,
.jh
