Re: PCI Hotplug to a VM does not work in Alma

Hi We have a chassis with a peripheral PCI device installed. We have a hypervisor running on the chassis where we have deployed a VM which can use the PCI device once it is attached. When the PCI device is powered on or off we need to do a hotplug in/out using virsh commands. Even though the virsh commands for hotplug is executed successfully, the VM sees the PCI inside the VM for one or 2 secs. What do you think is the issue? [root ~]# uname -a Linux 4.18.0-372.9.1.el8.x86_64 #1 SMP Fri Mar 15 05:32:38 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux [root ~]# virsh --version 8.0.0 [root ~]# rpm -qa | grep libvirt libvirt-daemon-driver-nwfilter-8.0.0-5.el8.x86_64 python3-libvirt-7.8.0-1.el8.x86_64 libvirt-daemon-driver-storage-logical-8.0.0-5.el8.x86_64 libvirt-libs-8.0.0-5.el8.x86_64 libvirt-daemon-config-nwfilter-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-gluster-8.0.0-5.el8.x86_64 libvirt-8.0.0-5.el8.x86_64 libvirt-daemon-8.0.0-5.el8.x86_64 libvirt-daemon-driver-nodedev-8.0.0-5.el8.x86_64 libvirt-daemon-config-network-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-iscsi-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-rbd-8.0.0-5.el8.x86_64 libvirt-daemon-driver-network-8.0.0-5.el8.x86_64 libvirt-daemon-driver-secret-8.0.0-5.el8.x86_64 python2-libvirt-python-5.10.0-1.el8.x86_64 libvirt-daemon-driver-qemu-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-core-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-iscsi-direct-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-scsi-8.0.0-5.el8.x86_64 libvirt-client-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-disk-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-8.0.0-5.el8.x86_64 libvirt-daemon-driver-interface-8.0.0-5.el8.x86_64 libvirt-daemon-driver-storage-mpath-8.0.0-5.el8.x86_64 libvirt-daemon-kvm-8.0.0-5.el8.x86_64 [root ~]# rpm -qa | grep qemu qemu-kvm-ui-opengl-6.2.0-11.el8.x86_64 qemu-kvm-6.2.0-11.el8.x86_64 qemu-img-6.2.0-11.el8.x86_64 qemu-kvm-block-iscsi-6.2.0-11.el8.x86_64 ipxe-roms-qemu-20200823-7.git4bd064de.el8.noarch qemu-kvm-block-gluster-6.2.0-11.el8.x86_64 qemu-kvm-block-rbd-6.2.0-11.el8.x86_64 qemu-kvm-block-curl-6.2.0-11.el8.x86_64 qemu-kvm-core-6.2.0-11.el8.x86_64 qemu-kvm-hw-usbredir-6.2.0-11.el8.x86_64 libvirt-daemon-driver-qemu-8.0.0-5.el8.x86_64 qemu-kvm-ui-spice-6.2.0-11.el8.x86_64 qemu-kvm-docs-6.2.0-11.el8.x86_64 qemu-kvm-block-ssh-6.2.0-11.el8.x86_64 qemu-kvm-common-6.2.0-11.el8.x86_64   [root ~]# *virsh nodedev-dettach**  **pci_0000_04_00_0* [12013.987821] pci_probe_reset_slot: call pci_slot_reset with probe=1 [12014.063669] pci_slot_reset (printk info): reset hotplug slot. [12014.134164] pci_reset_hotplug_slot(printk INFO): calling reset_slot (probe = 1) [Mar19 21:09] pci_probe_reset_slot: call pci_slot_reset with probe=1 [  +0.075848] pci_slot_reset (printk info): reset hotplug slot. [  +0.070495] pci_reset_hotplug_slot(printk INFO): calling reset_slot (probe = 1) *Device pci_0000_04_00_0 detached***   [root ~]# *virsh attach-device ROUTER8 /opt/us/bin/mrvl.xml* [12024.217540] pci_probe_reset_slot: call pci_slot_reset with probe=1 [ +10.083376] pci_probe_reset_slot: call pci_slot_reset with probe=1[12024.293548] pci_slot_reset (printk info): reset hotplug slot.