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  1. RHEL
  2. RHEL-7335

Live post-copy migration of the vm with failover VF device fails.

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    • Known Issue
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      .Live post-copy migration of VMs with failover VFs fails

      Currently, attempting to post-copy migrate a running virtual machine (VM) fails if the VM uses a device with the virtual function (VF) failover capability enabled. To work around the problem, use the standard migration type, rather than post-copy migration.
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      .Live post-copy migration of VMs with failover VFs fails Currently, attempting to post-copy migrate a running virtual machine (VM) fails if the VM uses a device with the virtual function (VF) failover capability enabled. To work around the problem, use the standard migration type, rather than post-copy migration.
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      Description of problem:
      live post-copy migration of the vm with failover VF device fails.

      Version-Release number of selected component (if applicable):
      guest:
      4.18.0-192.el8.x86_64
      host:
      4.18.0-192.el8.x86_64
      qemu-kvm-4.2.0-16.module+el8.2.0+6092+4f2391c1.x86_64

      How reproducible:
      100%

      Steps to Reproduce:
      1.On source host,create NetXtreme BCM57810 VF and set the mac address of the VF

      1. ip link set enp131s0f0 vf 0 mac 22:2b:62:bb:a9:82

      2.start a source guest with NetXtreme BCM57810 VF which enables failover
      /usr/libexec/qemu-kvm -name rhel8-2 -M q35 -enable-kvm \
      -monitor stdio \
      -nodefaults \
      -m 4G \
      -boot menu=on \
      -cpu Haswell-noTSX-IBRS \
      -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 \
      -smp 2,sockets=1,cores=2,threads=2,maxcpus=4 \
      -qmp tcp:0:5555,server,nowait \
      -blockdev node-name=back_image,driver=file,cache.direct=on,cache.no-flush=off,filename=/nfsmount/migra_test/192.qcow2,aio=threads \
      -blockdev node-name=drive-virtio-disk0,driver=qcow2,cache.direct=on,cache.no-flush=off,file=back_image \
      -device virtio-blk-pci,drive=drive-virtio-disk0,id=disk0,bus=root.1 \
      -device VGA,id=video1,bus=root.2 \
      -vnc :0 \
      -netdev tap,id=hostnet0,vhost=on \
      -device virtio-net-pci,netdev=hostnet0,id=net0,mac=22:2b:62:bb:a9:82,bus=root.3,failover=on \
      -device vfio-pci,host=0000:83:01.0,id=hostdev0,bus=root.4,failover_pair_id=net0 \

      3.On the source host,check the network info in guest

      1. ifconfig
        enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 10.73.33.214 netmask 255.255.254.0 broadcast 10.73.33.255
        inet6 2620:52:0:4920:202b:62ff:febb:a982 prefixlen 64 scopeid 0x0<global>
        inet6 fe80::202b:62ff:febb:a982 prefixlen 64 scopeid 0x20<link>
        ether 22:2b:62:bb:a9:82 txqueuelen 1000 (Ethernet)
        RX packets 5087 bytes 377754 (368.9 KiB)
        RX errors 0 dropped 5 overruns 0 frame 0
        TX packets 101 bytes 11887 (11.6 KiB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      enp3s0nsby: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
      ether 22:2b:62:bb:a9:82 txqueuelen 1000 (Ethernet)
      RX packets 4950 bytes 359401 (350.9 KiB)
      RX errors 0 dropped 0 overruns 0 frame 0
      TX packets 2 bytes 180 (180.0 B)
      TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
      ether 22:2b:62:bb:a9:82 txqueuelen 1000 (Ethernet)
      RX packets 137 bytes 18353 (17.9 KiB)
      RX errors 0 dropped 0 overruns 0 frame 0
      TX packets 99 bytes 11707 (11.4 KiB)
      TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
      device memory 0xfc800000-fc807fff

      lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
      inet 127.0.0.1 netmask 255.0.0.0
      inet6 ::1 prefixlen 128 scopeid 0x10<host>
      loop txqueuelen 1000 (Local Loopback)
      RX packets 0 bytes 0 (0.0 B)
      RX errors 0 dropped 0 overruns 0 frame 0
      TX packets 0 bytes 0 (0.0 B)
      TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      4.On target host,create 82599ES VF and set the mac address of the VF

      1. ip link set enp6s0f0 vf 0 mac 22:2b:62:bb:a9:82

      5.start a target guest in listening mode in order to wait for migrating from source guest
      ...
      -netdev tap,id=hostnet0,vhost=on \
      -device virtio-net-pci,netdev=hostnet0,id=net0,mac=22:2b:62:bb:a9:82,bus=root.3,failover=on \
      -device vfio-pci,host=0000:06:10.0,id=hostdev0,bus=root.4,failover_pair_id=net0 \
      -incoming tcp:0:5800 \

      6.On source host and target host, set postcopy mode on
      (qemu) migrate_set_capability postcopy-ram on

      7.Migrate guest from source host to target host.
      (qemu) migrate -d tcp:10.73.73.61:5800

      8.
      Before the migration is completed, change into postcopy mode:
      (qemu) migrate_start_postcopy

      9.The migration is completed within several seconds after starting the post-copy

      10.check the migration info on source host
      (qemu) info migrate
      globals:
      store-global-state: on
      only-migratable: off
      send-configuration: on
      send-section-footer: on
      decompress-error-check: on
      clear-bitmap-shift: 18
      Migration status: completed
      total time: 13638 milliseconds
      downtime: 6 milliseconds
      setup: 7059 milliseconds
      transferred ram: 643240 kbytes
      throughput: 801.15 mbps
      remaining ram: 0 kbytes
      total ram: 4211528 kbytes
      duplicate: 894347 pages
      skipped: 0 pages
      normal: 158535 pages
      normal bytes: 634140 kbytes
      dirty sync count: 2
      page size: 4 kbytes
      multifd bytes: 0 kbytes
      pages-per-second: 29470
      postcopy request count: 446

      11.check the migration info on the target host
      (qemu)
      qemu-kvm: VFIO_MAP_DMA: -14
      qemu-kvm: VFIO_MAP_DMA: -14
      qemu-kvm: VFIO_MAP_DMA: -14
      qemu-kvm: VFIO_MAP_DMA: -14
      qemu-kvm: VFIO_MAP_DMA: -14
      qemu-kvm: warning: vfio 0000:06:10.0: failed to setup container for group 63: memory listener initialization failed: Region vga.vram: vfio_dma_map(0x55943303cee0, 0xa0000, 0x10000, 0x7f05f0a00000) = -14 (Bad address)

      (qemu) info migrate
      globals:
      store-global-state: on
      only-migratable: off
      send-configuration: on
      send-section-footer: on
      decompress-error-check: on
      clear-bitmap-shift: 18
      Migration status: completed
      total time: 0 milliseconds

      12.On the target host,check the network info in guest

      1. ifconfig
        enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 10.73.33.214 netmask 255.255.254.0 broadcast 10.73.33.255
        inet6 2620:52:0:4920:202b:62ff:febb:a982 prefixlen 64 scopeid 0x0<global>
        inet6 fe80::202b:62ff:febb:a982 prefixlen 64 scopeid 0x20<link>
        ether 22:2b:62:bb:a9:82 txqueuelen 1000 (Ethernet)
        RX packets 5087 bytes 377754 (368.9 KiB)
        RX errors 0 dropped 5 overruns 0 frame 0
        TX packets 101 bytes 11887 (11.6 KiB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      enp3s0nsby: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
      ether 22:2b:62:bb:a9:82 txqueuelen 1000 (Ethernet)
      RX packets 4950 bytes 359401 (350.9 KiB)
      RX errors 0 dropped 0 overruns 0 frame 0
      TX packets 2 bytes 180 (180.0 B)
      TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
      inet 127.0.0.1 netmask 255.0.0.0
      inet6 ::1 prefixlen 128 scopeid 0x10<host>
      loop txqueuelen 1000 (Local Loopback)
      RX packets 0 bytes 0 (0.0 B)
      RX errors 0 dropped 0 overruns 0 frame 0
      TX packets 0 bytes 0 (0.0 B)
      TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      Actual results:
      live post-copy migration of the vm with failover VF device fails.

      Expected results:
      live post-copy migration of the vm with failover VF device is complete.
      The failover VF works well on both the source host and target host.

            lvivier@redhat.com Laurent Vivier
            yanghliu@redhat.com YangHang Liu
            Laurent Vivier Laurent Vivier
            Yanhui Ma Yanhui Ma
            Jiří Herrmann Jiří Herrmann
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              Created:
              Updated: