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---Problem Description---
kvmppc_set_passthru_irq_hv: Could not assign IRQ map traces are seen when pci
device is attached to kvm guest when "xive=off" is set
root@ltcrain8og-lp6:~# lspci
0028:01:00.0 Ethernet controller: Mellanox Technologies MT27710 Family
[ConnectX-4 Lx]
0028:01:00.1 Ethernet controller: Mellanox Technologies MT27710 Family
[ConnectX-4 Lx]
root@ltcrain8og-lp6:~/NET# lspci -nnk -s 0028:01:00.0
0028:01:00.0 Ethernet controller [0200]: Mellanox Technologies MT27710 Family
[ConnectX-4 Lx] [15b3:1015]
Subsystem: IBM Device [1014:061e]
Kernel driver in use: vfio-pci
Kernel modules: mlx5_core
root@ltcrain8og-lp6:~/NET# lspci -nnk -s 0028:01:00.1
0028:01:00.1 Ethernet controller [0200]: Mellanox Technologies MT27710 Family
[ConnectX-4 Lx] [15b3:1015]
Subsystem: IBM Device [1014:061e]
Kernel driver in use: vfio-pci
Kernel modules: mlx5_core
--- Steps to reproduce ---
1. Start a guest with kernel
2. unbind the pci device from host using below command
root@ltcrain8og-lp6:~/NET# virsh nodedev-detach pci_0028_01_00_0
Device pci_0028_01_00_0 detached
root@ltcrain8og-lp6:~/NET# virsh nodedev-detach pci_0028_01_00_1
Device pci_0028_01_00_1 detached
3. Now attach the pci device to guest using virsh attach-device command.
The xml snippet used is given below
root@ltcrain8og-lp6:~/NET# vi pci2.xml
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0028' bus='0x01' slot='0x00' function='0x0'/>
</source>
</hostdev>
root@ltcrain8og-lp6:~/NET# virsh attach-device vm pci2.xml
Device attached successfully
4. On guest side the pci device gets attached successfully, and
interface comes up. But the following traces are seen every time the
device is attached
[57906.347794] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(100,4900)
[57906.347812] kvmppc_set_passthru_irq (irq 100, gsi 4900) fails: -2
[57906.347817] vfio-pci 0028:01:00.0: irq bypass producer (token
00000000c84b35a9) registration fails: -2
[57906.357879] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(100,4900)
[57906.357885] kvmppc_set_passthru_irq (irq 100, gsi 4900) fails: -2
[57906.357889] vfio-pci 0028:01:00.0: irq bypass producer (token
00000000c84b35a9) registration fails: -2
[57906.357983] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(101,4901)
[57906.357986] kvmppc_set_passthru_irq (irq 101, gsi 4901) fails: -2
[57906.357989] vfio-pci 0028:01:00.0: irq bypass producer (token
0000000024362fe0) registration fails: -2
[57906.368181] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(100,4900)
[57906.368187] kvmppc_set_passthru_irq (irq 100, gsi 4900) fails: -2
[57906.368190] vfio-pci 0028:01:00.0: irq bypass producer (token
00000000c84b35a9) registration fails: -2
[57906.368283] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(101,4901)
[57906.368288] kvmppc_set_passthru_irq (irq 101, gsi 4901) fails: -2
[57906.368292] vfio-pci 0028:01:00.0: irq bypass producer (token
0000000024362fe0) registration fails: -2
[57906.368384] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(102,4902)
[57906.368389] kvmppc_set_passthru_irq (irq 102, gsi 4902) fails: -2
[57906.368392] vfio-pci 0028:01:00.0: irq bypass producer (token
00000000f9dfc684) registration fails: -2
[57906.378034] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(100,4900)
[57906.378039] kvmppc_set_passthru_irq (irq 100, gsi 4900) fails: -2
[57906.378042] vfio-pci 0028:01:00.0: irq bypass producer (token
00000000c84b35a9) registration fails: -2
[57906.378135] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(101,4901)
[57906.378140] kvmppc_set_passthru_irq (irq 101, gsi 4901) fails: -2
[57906.378143] vfio-pci 0028:01:00.0: irq bypass producer (token
0000000024362fe0) registration fails: -2
[57906.378234] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for
(102,4902)
[57906.378238] kvmppc_set_passthru_irq (irq 102, gsi 4902) fails: -2
Contact Information = sthou...@in.ibm.com
---uname output---
na
Machine Type = NA
---Debugger---
A debugger is not configured
Posted v1 upstream:
https://lore.kernel.org/all/20250425185641.1611857-1-amach...@linux.ibm.com/
~Amit
mirorring to distro for awareness.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-212593 severity-medium
targetmilestone-inin---
--
kvmppc_set_passthru_irq_hv: Could not assign IRQ map traces are seen when pci
device is attached to kvm guest when "xive=off" is set
https://bugs.launchpad.net/bugs/2109951
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