Description of problem: Boot Win2019 guest both a virtio-net-pci device and vfio-pci device. First hot unplug virtio-net nic, then hot unplug vfio nic, next hot plug vfio nic fail. Version-Release number of selected component (if applicable): qemu-kvm-4.0.0-0.module+el8.1.0+3169+3c501422.x86_64 kernel-4.18.0-86.el8.x86_64 virtio-win-1.9.7-3.el8.noarch How reproducible: 100% Steps to Reproduce: 1.Boot the Win2019 guest both a virtio-net-pci device and a vfio-pci device. Qemu cli: /usr/libexec/qemu-kvm -name Win2019 \ -M q35,kernel-irqchip=split -m 4G \ -cpu Haswell-noTSX \ -nodefaults \ -device intel-iommu,intremap=on,caching-mode=on \ -smp 4,sockets=1,cores=4,threads=1 \ -device pcie-root-port,id=root.1,chassis=1 \ -device pcie-root-port,id=root.2,chassis=2 \ -device pcie-root-port,id=root.3,chassis=3 \ -device pcie-root-port,id=root.4,chassis=4 \ -device pcie-root-port,id=root.5,chassis=5 \ -blockdev driver=file,cache.direct=off,cache.no-flush=on,filename=/home/win2019.qcow2,node-name=my_file \ -drive id=drive_cd1,if=none,snapshot=off,aio=native,cache=none,media=cdrom,file=/home/en_windows_server_2019_updated_march_2019_x64_dvd_2ae967ab.iso \ -blockdev driver=qcow2,node-name=my,file=my_file \ -device virtio-blk-pci,drive=my,id=virtio-blk0,bus=root.1 \ -device ide-cd,id=cd1,drive=drive_cd1,bus=ide.0,unit=0 \ -vnc :1 \ -vga qxl \ -monitor stdio \ -qmp tcp:0:5555,server,nowait \ -usb -device usb-tablet \ -boot menu=on \ -device vfio-pci,host=0000:04:00.0,id=pf,bus=root.3 \ -device virtio-net-pci,netdev=nic1,id=vnet0,mac=54:43:00:1a:11:33,bus=root.2 \ -netdev tap,id=nic1,script=/etc/qemu-ifup,vhost=on \ 2.Hot unplug virtio-net-pci device (qemu) device_del vnet0 (qemu) netdev_del nic1 qmp: # telnet 10.73.73.73 5555 {"execute":"qmp_capabilities"} {"return": {}} {"execute": "device_del", "arguments": {"id": "vnet0"}} {"return": {}} {"timestamp": {"seconds": 1557971480, "microseconds": 803944}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral/vnet0/virtio-backend"}} {"execute": "netdev_del", "arguments": {"id": "nic1"}} {"return": {}} 3. Hot unplug vfio (qemu) device_del pf qmp: {"execute": "device_del", "arguments": {"id": "pf"}} {"return": {}} 4. Hot plug vfio (qemu) device_add vfio-pci,host=0000:04:00.0,id=pf,bus=root.3 Duplicate ID 'pf' for device qmp: {"execute": "device_add", "arguments": {"driver":"vfio-pci","host":"04:00.0","id":"pf","bus":"root.3"}} {"error": {"class": "GenericError", "desc": "Duplicate ID 'pf' for device"}} Actual results: Hot unplug and hot plug vfio-pci device after hot unplug virtio-net-pci device failed. Expected results: The vfio-pci device should be pluged successfully. Additional info: 1. The same test steps with rhel8 guest is works well. 2. Without step 2, this issue can not be reproduced. 3. NIC info: # lspci |grep 04:00.0 04:00.0 Ethernet controller: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ (rev 02)
QEMU has been recently split into sub-components and as a one-time operation to avoid breakage of tools, we are setting the QEMU sub-component of this BZ to "General". Please review and change the sub-component if necessary the next time you review this BZ. Thanks
This BZ is solved by BZ#1708480
Updating blocked-by based on comment 13. Not going to CLOSEDUP yet because the symptoms in the two BZs are different and we might want to document both.
Verification： Versions: qemu-kvm-4.2.0-15.module+el8.2.0+6029+618ef2ec.x86_64 4.18.0-190.el8.x86_64 virtio-win-1.9.11-1.el8.noarch Steps: (1)start the Win2019 guest with a virtio-net-pci device and a vfio-pci device. /usr/libexec/qemu-kvm -name Win2019 \ -M q35,kernel-irqchip=split \ -m 4G \ -nodefaults \ -cpu Haswell-noTSX \ -smp 4,sockets=1,cores=4,threads=1 \ -device pcie-root-port,id=root.1,chassis=1,addr=0x2.0,multifunction=on \ -device pcie-root-port,id=root.2,chassis=2,addr=0x2.1 \ -device pcie-root-port,id=root.3,chassis=3,addr=0x2.2 \ -device pcie-root-port,id=root.4,chassis=4,addr=0x2.3 \ -device pcie-root-port,id=root.5,chassis=5,addr=0x2.4 \ -device pcie-root-port,id=root.6,chassis=6,addr=0x2.5 \ -device pcie-root-port,id=root.7,chassis=7,addr=0x2.6 \ -device pcie-root-port,id=root.8,chassis=8,addr=0x2.7 \ -device intel-iommu,intremap=on,caching-mode=on \ -blockdev driver=file,cache.direct=off,cache.no-flush=on,filename=/home/images/win2019.qcow2,node-name=my_file \ -blockdev driver=qcow2,node-name=my,file=my_file \ -device virtio-blk-pci,drive=my,id=virtio-blk0,bus=root.1 \ -drive id=drive_cd1,if=none,snapshot=off,aio=native,cache=none,media=cdrom,file=/home/images/en_windows_server_2019_x64_dvd_4cb967d8.iso \ -device ide-cd,id=cd1,drive=drive_cd1,bus=ide.0,unit=0 \ -drive id=drive_winutils,if=none,snapshot=off,aio=native,cache=none,media=cdrom,file=/usr/share/virtio-win/virtio-win-1.9.11.iso \ -device ide-cd,id=winutils,drive=drive_winutils,bus=ide.1,unit=0 \ -vnc :0 \ -vga qxl \ -monitor stdio \ -usb -device usb-tablet \ -boot menu=on \ -qmp tcp:0:5555,server,nowait \ -device virtio-net-pci,netdev=nic1,id=vnet0,mac=54:43:00:1a:11:33,bus=root.2 \ -netdev tap,id=nic1,script=/etc/qemu-ifup,vhost=on \ -device vfio-pci,host=0000:04:00.0,id=pf,bus=root.3 \ (2)hot unplug virtio-net-pci device qmp: # telnet 10.73.73.73 5555 {"execute":"qmp_capabilities"} {"return": {}} {"execute": "device_del", "arguments": {"id": "vnet0"}} {"return": {}} {"timestamp": {"seconds": 1584937625, "microseconds": 182887}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral/vnet0/virtio-backend"}} {"timestamp": {"seconds": 1584937625, "microseconds": 237655}, "event": "DEVICE_DELETED", "data": {"device": "vnet0", "path": "/machine/peripheral/vnet0"}} {"execute": "netdev_del", "arguments": {"id": "nic1"}} {"return": {}} (3)hot unplug vfio-pci device qmp: {"execute": "device_del", "arguments": {"id": "pf"}} {"return": {}} {"timestamp": {"seconds": 1584937668, "microseconds": 815057}, "event": "DEVICE_DELETED", "data": {"device": "pf", "path": "/machine/peripheral/pf"}} (4)hot plug vfio-pci device qmp: {"execute": "device_add", "arguments": {"driver":"vfio-pci","host":"04:00.0","id":"pf","bus":"root.3"}} {"return": {}} (5)check vfio-pci device status The vfio-pci device can be hotpluged to a Win2019 guest successfully. According to the test result,this bug has been fixed well. Set the bug status to VERIFIED.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:2017