Red Hat Bugzilla – Bug 1511312
Migrate an VM with pci-bridge or pcie-root-port failed
Last modified: 2018-04-10 20:46:47 EDT
Description of problem: Migrate an VM with pci-bridge or pcie-root-port failed Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.10.0-4.el7.x86_64 How reproducible: 100% Steps to Reproduce: Scenario 1: Migrate VM from RHEL7.5 to RHEL7.4 1. Prepare the migrate environment. 2. Start a VM with the following xml: ...... <controller type='pci' index='0' model='pci-root'/> ...... # virsh start lmn Domain lmn started 3. Migrate the VM to RHEL7.4: # virsh migrate lmn qemu+ssh://10.66.7.27/system --unsafe --verbose --live root@10.66.7.27's password: Migration: [100 %] 4. Re-edit the VM with following xml and start: ...... <controller type='pci' index='0' model='pci-root'/> <controller type='pci' index='1' model='pci-bridge'/> ...... # virsh start lmn Domain lmn started 5.Migrate the VM to RHEL7.4: # virsh migrate lmn qemu+ssh://10.66.7.27/system --unsafe --verbose --live root@10.66.7.27's password: Migration: [100 %]error: internal error: qemu unexpectedly closed the monitor: 2017-11-08T06:33:53.174967Z qemu-kvm: -chardev pty,id=charserial0: char device redirected to /dev/pts/1 (label charserial0) 2017-11-08T06:34:47.874295Z qemu-kvm: Missing section footer for 0000:00:01.0/pcie-root-port 2017-11-08T06:34:47.874395Z qemu-kvm: warning: TSC frequency mismatch between VM (3392295 kHz) and host (3392293 kHz), and TSC scaling unavailable 2017-11-08T06:34:47.874590Z qemu-kvm: load of migration failed: Invalid argument 6. The result also happened on q35 machine. Actual results: As above descriptions. Expected results: Migrate successfully. Additional info: Not reproduced on qemu-kvm-rhev-2.10.0-2.el7.x86_64
pci-bridge issue is tracked in the following BZ: Bug 1508271 - Migration is failed from host RHEL7.4.z to host RHEL7.5 with "-machine pseries-rhel7.4.0 -device pci-bridge,id=pci_bridge,bus=pci.0,addr=03,chassis_nr=1"
Result on comment4 is really werid. Could you doublecheck that the machine type is the same on both sides? It looks like you are using the 7.5.0 one in one side and 7.4.0 on the other no?
(In reply to Juan Quintela from comment #5) > Result on comment4 is really werid. Could you doublecheck that the machine > type is the same on both sides? It looks like you are using the 7.5.0 one > in one side and 7.4.0 on the other no? Sorry, changed the same machine type and can reproduce the issue Hit the error (qemu) red_dispatcher_loadvm_commands: qemu-kvm: Missing section footer for 0000:00:0a.0/pcie-root-port /usr/libexec/qemu-kvm \ -M pc-q35-rhel7.4.0,accel=kvm,kernel-irqchip=split \ -device intel-iommu,intremap=on \ -cpu Haswell-noTSX \ -nodefaults -rtc base=utc \ -m 4G \ -smp 4,sockets=4,cores=1,threads=1 \ -enable-kvm \ -uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \ -k en-us \ -nodefaults \ -global isa-debugcon.iobase=0x402 \ -boot menu=on \ -qmp tcp:0:6667,server,nowait \ -usb \ -device usb-tablet \ -vga qxl \ -drive file=/mnt/test/rhel75-64-virtio.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop \ -device virtio-blk-pci,drive=drive-virtio-disk0,id=virtio-disk0 \ -device pcie-root-port,bus=pcie.0,id=root0,multifunction=on,chassis=1,addr=0xa.0 \ -device virtio-net-pci,netdev=tap10,mac=9a:6a:6b:6c:6d:6e,bus=root0 -netdev tap,id=tap10 \ -device pcie-root-port,bus=pcie.0,id=root1,chassis=11,addr=0xa.1 \ -monitor stdio \ -vnc :1 \ Thanks Jing
Confirmed can trigger it with the trivial: /usr/libexec/qemu-kvm -M pc-q35-rhel7.4.0,accel=kvm -nographic -device pcie-root-port,bus=pcie.0,id=root0 -S
The x-migrate-msix property is false on 2.9 and true on 2.10; flipping it makes the migration work.
This is odd because I can see: SET_MACHINE_COMPAT(m, PC_RHEL7_4_COMPAT); #define PC_RHEL7_4_COMPAT \ HW_COMPAT_RHEL7_4 \ #define HW_COMPAT_RHEL7_4 \ { /* HW_COMPAT_RHEL7_4 */ \ .driver = "intel-iommu",\ .property = "pt",\ .value = "off",\ },{ /* HW_COMPAT_RHEL7_4 */ \ .driver = "pcie-root-port",\ .property = "x-migrate-msix",\ .value = "false",\ },
ok, we just need to remove that last entry; brewing.
Downstream fixes posted: pcie_root_port: Fix x-migrate-msix compat q35: Fix mismerge
Fix included in qemu-kvm-rhev-2.10.0-7.el7
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/RHSA-2018:1104