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== Comment: #0 - Kowshik Jois B S <[email protected]> - 2025-03-07
02:15:20 ==
---Problem Description---
A reboot is required for the interfaces attached through "virsh
attach-interface" to be reflected on the guest. Same behavior is observed with
or without the "--live" option.
---Debugger---
A debugger is not configured
---uname output---
Linux ubuntu2504 6.12.0-16-generic #16-Ubuntu SMP Fri Feb 14 16:16:28 UTC 2025
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = P10 Rainier
Contact Information = [email protected]
---Steps to Reproduce---
1. On a Ubuntu25.04 Host, create a Ubuntu25.04 guest
2. Take a note of available interfaces on the guest and guest's xml(virsh
dumpxml)
3. Attach an interface by using "virsh attach-interface" command
virsh attach-interface --live Ubuntu1 bridge --source virbr0
4. Check for the interfaces again on guest and guest's xml.
Expected: Newly added interface should be reflected on both guest and
guest's xml
Actual: Newly added interface is reflecting on xml but not on the guest
5. reboot the guest and check for the interfaces again.
(Now new interfaces can be seen on both guest and xml)
---Additional Information---
# qemu-system-ppc64 --version
QEMU emulator version 9.2.1 (Debian 1:9.2.1+ds-1ubuntu3)
Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers
# libvirtd --version
libvirtd (libvirt) 11.0.0
virt-install command used:
virt-install --name Ubuntu1 --ram 2048 --disk
path=/var/lib/libvirt/images/data/Ubuntu1.qcow2,size=8 --vcpus 4 --os-type
linux --os-variant generic --network bridge=virbr0 --graphics none --console
pty,target_type=serial --cdrom
/var/lib/libvirt/images/plucky-live-server-ppc64el.iso
== Comment: #12 - Tasmiya Nalatwad <[email protected]> - 2025-04-11
04:18:52 ==
Hi Team,
The virsh attach/detach-device is failing to attach/detach the PCI
Passthrough devices to guest on Fedora-42 kernel 6.14.1-300.fc42.ppc64le
--- Host Details ---
OS : Fedora 42
Kernel : 6.14.1-300.fc42.ppc64le
Qemu : QEMU emulator version 9.2.3 (qemu-9.2.3-1.fc42)
Libvirt : libvirtd (libvirt) 11.0.0
--- Guest Details ---
OS : Fedora 42
Kernel : 6.14.1-300.fc42.ppc64lee
--- Steps to recreate the issue ---
1. Detach a pci device from host using virsh nodedev-detach command
2. Attach the device to guest using virsh attach-device command.
3. The virsh attach-device command is successful on host, but the device is not
seen on the guest.
4. Perform a guest reboot and check the device on guest. The device is attached
to the guest after reboot.
5. Similarly virsh detach-device show successful on host, but the device is not
detached from guest until guest is rebooted. After a reboot performed on the
guest the device gets detached.
--- pci.xml ---
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0028' bus='0x01' slot='0x00' function='0x0'/>
</source>
<address type="pci" domain="0x0000" bus="0x00" slot="0x07" function="0x0"/>
</hostdev>
--- virsh attach/detach-device ----
root@localhost:~# virsh attach-device vm1 pci.xml
Device attached successfully
root@localhost:~# virsh detach-device vm1 pci.xml
Device attached successfully
Thank you,
Tasmiya
== Comment: #26 - Haren Myneni <[email protected]> - 2025-04-21 16:14:24 ==
Guest /proc/device-tree:
[root@fedora41-mem device-tree]# ls
'#address-cells' memory@0
aliases mmu
chosen model
compatible name
cpus openprom
device_type options
event-sources packages
hypervisor pci@800000020000000
ibm,drc-indexes pci@800000020000001
ibm,drc-names phandle
ibm,drc-power-domains rtas
ibm,drc-types '#size-cells'
ibm,partition-name slof,from-fdt
ibm,persistent-memory system-id
ibm,plat-res-int-priorities vdevice
interrupt-controller@60302031b0000 vm,uuid
[root@fedora41-mem device-tree]# find . -name ibm,drc-info -print
[root@fedora41-mem device-tree]#
The drmgr kernel interface look for drc-index (passed by the user space)
in the drc-info and then update the device tree for the new device.
>From the guest /proc/device-tree, ibm,drc-info is missing. Hence we see
the failure with the latest drmgr (add device).
I do not know who exports this device-tree to guests in KVM environment.
Also ibm,drc-indexes, ibm,drc-names and ibm,drc-types properties are
available on guest, but not on host. Some tools such as drmgr will be
looking for same interfaces similar to powerVM.
== Comment: #28 - Haren Myneni <[email protected]> - 2025-04-22 03:05:49 ==
Amit tested with this patch without any issues. Now need to decide whether we
support DLPAR IO kernel interface for old FW.
Tyrel, Any concerns?
== Comment: #30 - Haren Myneni <[email protected]> - 2025-05-04 14:03:55 ==
The actual issue is guest having old device-tree entries such as drc-indexes
instead of drc-info. So the fix should be in virsh tool to expose same
device-tree entries that host has.
The next fix is in the kernel to support old FW and the patch is
submitted upstream. Waiting for acceptance
https://lore.kernel.org/linuxppc-
dev/[email protected]/
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-211790 severity-high
targetmilestone-inin2510
--
[Ubuntu25.04] "virsh attach-interface" requires a reboot to reflect the
attached interfaces on the guest
https://bugs.launchpad.net/bugs/2110407
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