On 2025-06-09 23:38, Andrea Bolognani wrote:
On Mon, Jun 09, 2025 at 09:50:24AM +0530, Trupti wrote:
Package: libvirt-daemon
Severity: important
Tags: trixie ppc64el
Version Info:
Host/Guest OS: Debian Trixie/sid (powerpc64le)
Kernel: 6.12.27-powerpc64le-64k
QEMU: 10.0.0
Libvirt: 11.3.0
Issue:
Live-attaching or detaching a device with virsh on a Debian Trixie
(ppc64le)
guest does not take effect immediately. While the host command
succeeds, the
guest OS only recognizes the change after a full reboot. This defeats
the
purpose of the hotplug feature.
Steps to reproduce:
1) Start a guest with Debian-Trixie OS same as Host
2) Attach an interface to guest using below virsh attach-device
command
'virsh attach-interface --live vm bridge --source virbr0'
3) The command executes successfully and give output as "Interface
attached
successfully"
4) But the interface is not immediately attached to guest. When the
guest is
rebooted , then the
interface is seen on the guest.
5) Same is happening with virsh detach-interface command. A guest
reboot is
required to remove
the interface from guest
What's the output of attach-interface if you pass the --print-xml
flag to it? What does the full live XML look like before and after
the operation?
I have gathered the diagnostic information you requested.
virsh attach-interface --live vm bridge --source virbr0 --print-xml
The command produced the following output:
<interface type='bridge'>
<source bridge='virbr0'/>
</interface>
I have attached the two files, before.xml and after.xml.
Honestly this sounds like a guest OS issue rather than a bug in
libvirt. Is any message produced in dmesg/journal as a consequence of
the hotplug operation?
The guest dmesg shows the RTAS hot-plug signal, but no further messages
appear.
Thanks Trupti
<domain type='qemu' id='1'>
<name>vm</name>
<uuid>80dcb65d-7a83-4b7d-931e-0540a6fdd44c</uuid>
<memory unit='KiB'>6291456</memory>
<currentMemory unit='KiB'>6291456</currentMemory>
<vcpu placement='static'>4</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='ppc64le' machine='pseries-10.0'>hvm</type>
<boot dev='hd'/>
</os>
<cpu mode='custom' match='exact' check='none'>
<model fallback='forbid'>POWER10</model>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-ppc64le</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/debian-test.qcow2' index='2'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu'/>
<target dev='sda' bus='scsi'/>
<readonly/>
<alias name='scsi0-0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='qemu-xhci' ports='15'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</controller>
<controller type='scsi' index='0' model='virtio-scsi'>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<model name='spapr-pci-host-bridge'/>
<target index='0'/>
<alias name='pci.0'/>
</controller>
<controller type='virtio-serial' index='0'>
<alias name='virtio-serial0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:87:92:27'/>
<source bridge='virbr0'/>
<target dev='vnet0'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/1'/>
<target type='spapr-vio-serial' port='0'>
<model name='spapr-vty'/>
</target>
<alias name='serial0'/>
<address type='spapr-vio' reg='0x30000000'/>
</serial>
<console type='pty' tty='/dev/pts/1'>
<source path='/dev/pts/1'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
<address type='spapr-vio' reg='0x30000000'/>
</console>
<channel type='unix'>
<source mode='bind'
path='/run/libvirt/qemu/channel/1-vm/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0' state='connected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</memballoon>
<panic model='pseries'/>
</devices>
<seclabel type='dynamic' model='apparmor' relabel='yes'>
<label>libvirt-80dcb65d-7a83-4b7d-931e-0540a6fdd44c</label>
<imagelabel>libvirt-80dcb65d-7a83-4b7d-931e-0540a6fdd44c</imagelabel>
</seclabel>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+64055:+64055</label>
<imagelabel>+64055:+64055</imagelabel>
</seclabel>
</domain>
<domain type='qemu' id='1'>
<name>vm</name>
<uuid>80dcb65d-7a83-4b7d-931e-0540a6fdd44c</uuid>
<memory unit='KiB'>6291456</memory>
<currentMemory unit='KiB'>6291456</currentMemory>
<vcpu placement='static'>4</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='ppc64le' machine='pseries-10.0'>hvm</type>
<boot dev='hd'/>
</os>
<cpu mode='custom' match='exact' check='none'>
<model fallback='forbid'>POWER10</model>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-ppc64le</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/debian-test.qcow2' index='2'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu'/>
<target dev='sda' bus='scsi'/>
<readonly/>
<alias name='scsi0-0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='qemu-xhci' ports='15'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</controller>
<controller type='scsi' index='0' model='virtio-scsi'>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<model name='spapr-pci-host-bridge'/>
<target index='0'/>
<alias name='pci.0'/>
</controller>
<controller type='virtio-serial' index='0'>
<alias name='virtio-serial0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:87:92:27'/>
<source bridge='virbr0'/>
<target dev='vnet0'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x0'/>
</interface>
<interface type='bridge'>
<mac address='52:54:00:a2:19:7a'/>
<source bridge='virbr0'/>
<target dev='vnet3'/>
<model type='rtl8139'/>
<alias name='net1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/1'/>
<target type='spapr-vio-serial' port='0'>
<model name='spapr-vty'/>
</target>
<alias name='serial0'/>
<address type='spapr-vio' reg='0x30000000'/>
</serial>
<console type='pty' tty='/dev/pts/1'>
<source path='/dev/pts/1'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
<address type='spapr-vio' reg='0x30000000'/>
</console>
<channel type='unix'>
<source mode='bind'
path='/run/libvirt/qemu/channel/1-vm/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0' state='connected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</memballoon>
<panic model='pseries'/>
</devices>
<seclabel type='dynamic' model='apparmor' relabel='yes'>
<label>libvirt-80dcb65d-7a83-4b7d-931e-0540a6fdd44c</label>
<imagelabel>libvirt-80dcb65d-7a83-4b7d-931e-0540a6fdd44c</imagelabel>
</seclabel>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+64055:+64055</label>
<imagelabel>+64055:+64055</imagelabel>
</seclabel>
</domain>
