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Bug
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Resolution: Unresolved
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Undefined
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None
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rhel-9.8, rhel-10.2
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None
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None
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None
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rhel-virt-core-libvirt-1
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None
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False
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False
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None
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None
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None
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None
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Unspecified
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Unspecified
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Unspecified
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None
What were you trying to do that didn't work?
Hotplug 2 pci devices to guest with managed = 'yes' another with managed ignored. The first hot-unplug the pci device with managed = 'yes' then hot-unplug another pci device with managed ignored. After that found the pci device with managed = 'yes' fails to rebind to original host driver.
Please provide the package NVR for which the bug is seen:
On rhel10.2 # rpm -q libvirt qemu-kvm libvirt-11.10.0-10.el9.x86_64 qemu-kvm-10.1.0-15.el9.x86_64
On rhel9.8 # rpm -q libvirt qemu-kvm libvirt-11.10.0-11.el9_8.x86_64 qemu-kvm-10.1.0-15.el9.x86_64
How reproducible is this bug?:100%
Steps to reproduce
1. There are 2 pci devices then detach one of them then the drivers like below:
# virsh nodedev-detach pci_0000_01_00_1 Device pci_0000_01_00_1 detached # ls -l /sys/bus/pci/devices/0000\:01\:00.1/driver lrwxrwxrwx. 1 root root 0 Mar 9 04:12 /sys/bus/pci/devices/0000:01:00.1/driver -> ../../../../bus/pci/drivers/vfio-pci # ls -l /sys/bus/pci/devices/0000\:01\:00.0/driver lrwxrwxrwx. 1 root root 0 Mar 9 06:42 /sys/bus/pci/devices/0000:01:00.0/driver -> ../../../../bus/pci/drivers/tg3
2. Start a guest
# virsh start vm2
Domain 'vm2' started
3. Hotplug first pci device with managed = 'yes':
# cat pci-0.xml <hostdev mode='subsystem' type='pci' managed='yes'> <driver iommufd='yes'/> <source> <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </source> </hostdev> # virsh attach-device vm2 pci-0.xml Device attached successfully
4. Hotplug second pci device with managed ignored:
# cat pci-1.xml <hostdev mode='subsystem' type='pci' > <driver iommufd='yes'/> <source> <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/> </source> </hostdev> # virsh attach-device vm2 pci-1.xml Device attached successfully
5. Check 2 pci devices drivers on host:
# ls -l /sys/bus/pci/devices/0000\:01\:00.0/driver lrwxrwxrwx. 1 root root 0 Mar 9 06:46 /sys/bus/pci/devices/0000:01:00.0/driver -> ../../../../bus/pci/drivers/vfio-pci # ls -l /sys/bus/pci/devices/0000\:01\:00.1/driver lrwxrwxrwx. 1 root root 0 Mar 9 04:12 /sys/bus/pci/devices/0000:01:00.1/driver -> ../../../../bus/pci/drivers/vfio-pci
6. Hot-unplug first pci device with managed = 'yes':
# virsh detach-device vm2 pci-0.xml Device detached successfully
7. Hot-unplug second pci device with managed ignored:
# virsh detach-device vm2 pci-1.xml Device detached successfully
8. Check the 2 pci devices drivers:
# ls -l /sys/bus/pci/devices/0000\:01\:00.0/driver
ls: cannot access '/sys/bus/pci/devices/0000:01:00.0/driver': No such file or directory
# ls -l /sys/bus/pci/devices/0000\:01\:00.1/driver
lrwxrwxrwx. 1 root root 0 Mar 9 04:12 /sys/bus/pci/devices/0000:01:00.1/driver -> ../../../../bus/pci/drivers/vfio-pci
Expected results
The first pci device should rebind to its original host driver
Actual results
The first pci device fails to rebind to its original host driver
Additional info: Issue disappear if hot-unplug the pci device with managed ignored first.
