I'm trying to automatically pass interface status changes (e.g. LAN cable connection/disconnection, ) to a QEMU Debian virt, but the status in the virt is always 'up' (i.e. 'virsh domif-getlink 3 macvtap0' == up).
I'v tried setting 'virsh domif-setlink 3 macvtap1 up' or down, which works (i.e. domif-getlink==down). But I want that state to be automatically propagated to the virt.
The only thing I found after hours of searching was "Default behavior if [..] unspecified is to have the link state up" [2].
Do I miss something, or is this simply not integrated??
Best, John
On the host this is what I observed:
ip link show|grep enp1s0
3: enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
19: macvtap1@enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state LOWERLAYERDOWN mode DEFAULT group default qlen 500
virsh domiflist 3
setlocale: No such file or directory
Interface  Type       Source     Model       MAC
macvtap0   direct     enp3s0     virtio      00:30:d6:19:4c:8c
macvtap1   direct     enp1s0     virtio      00:30:d6:19:2a:2d
vnet5      network    vmnet0     virtio      52:54:00:dc:14:e4
------------------------------------------------------------------------------ and
virsh domif-getlink 3 macvtap0
macvtap0 up
Following are stats concerning to the bug report how to [1]:
  • The version number of the libvirt build, or SHA1 of the GIT commit
    • virsh --version -> 3.0.0
    • ii  gir1.2-libvirt-glib-1.0:amd64   1.0.0-1                        amd64        GObject introspection files for the libvirt-glib library
      ii  libvirt-clients                 3.0.0-4+deb9u1                 amd64        Programs for the libvirt library
      ii  libvirt-daemon                  3.0.0-4+deb9u1                 amd64        Virtualization daemon
      ii  libvirt-daemon-system           3.0.0-4+deb9u1                 amd64        Libvirt daemon configuration files
      ii  libvirt-glib-1.0-0:amd64        1.0.0-1                        amd64        libvirt GLib and GObject mapping library
      ii  libvirt0                        3.0.0-4+deb9u1                 amd64        library for interfacing with different virtualization systems
      ii  python-libvirt                  3.0.0-2                        amd64        libvirt Python bindings
      ii  qemu-kvm                        1:2.8+dfsg-6+deb9u3            amd64        QEMU Full virtualization on x86 hardware
      ii  virt-manager                    1:1.4.0-5                      all          desktop application for managing virtual machines
      ii  virtinst                        1:1.4.0-5                      all          Programs to create and clone virtual machines
  • The hardware architecture being used
    • x86_64
  • The name of the hypervisor (Xen, QEMU, KVM)
    • QEMU
  • The XML config of the guest domain if relevant
    •     <interface type='direct'>
            <mac address='00:aa:bb:cc:dd:ee'/>
            <source dev='enp1s0' mode='passthrough'/>
            <model type='virtio'/>
            <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
  • For QEMU/KVM, the domain logfile from /var/log/libvirt/qemu
[1] https://libvirt.org/bugs.html#quality
[2] https://libvirt.org/formatdomain.html#elementLink
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