Hi,
I'm investigating an issue seen over a live migration from a modified
qemu-kvm-ev-2.3.0-31.el7_2.7.1 to a modified qemu-kvm-ev-2.6.0-28.el7_3.9.1. We
hit an issue down in get_pci_config_device() that caused the migration to fail.
The qemu logs on the destination are included below.
I'm looking for some guidance on the call flow that leads to this function, and
the likely causes of the bad config data. And if anyone can help me decode the
config data information in the log (cmask/wmask/wlcmask) and the logic of the
"bad config data" check I'd appreciate it.
Thanks,
Chris
2017-06-06 16:29:44.940+0000: starting up libvirt version: 2.0.0, package:
10.el7_3.5.tis.15 (Unknown, 2017-06-05-23:48:01, yow-cgts4-lx.wrs.com), qemu
version: 2.6.0 (qemu-kvm-ev-2.6.0-28.el7_3.9.1.tis.39), hostname: compute-0
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
QEMU_AUDIO_DRV=none /usr/bin/kvm '-c 0x00000000000000000000000000000001' '-n 4'
--proc-type=secondary --file-prefix=vs -- -enable-dpdk -name
guest=instance-00000001,debug-threads=on -S -object
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu
/domain-1-instance-00000001/master-key.aes -machine
pc-i440fx-2.2,accel=kvm,usb=off -m 512 -realtime mlock=off -smp
1,sockets=1,cores=1,threads=1 -object
memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/mnt/huge-2048kB/libvirt/qemu,share=yes,size=536870912,host-nodes=0,policy=bind
-numa node,nodeid=0,cpus=0
,memdev=ram-node0 -uuid b2bef0a9-22d3-4abc-9d61-cf3a79bdba53 -smbios
'type=1,manufacturer=OpenStack Foundation,product=OpenStack
Nova,version=2015.1.0,serial=713315ee-a857-11e1-baef-001e674e0243,uuid=b2bef0a9-22d3-4abc-9d61-cf3a79bdba53'
-no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libv
irt/qemu/domain-1-instance-00000001/monitor.sock,server,nowait -mon
chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global
kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot
reboot-timeout=5000,strict=on -device
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/dev/disk/b
y-path/ip-192.168.205.6:3260-iscsi-iqn.2010-10.org.openstack:volume-d0446a88-a7f8-487d-9c9c-f15beb009f80-lun-0,format=raw,if=none,id=drive-virtio-disk0,serial=d0446a88-a7f8-487d-9c9c-f15beb009f80,cache=none,aio=native
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,booti
ndex=1 -netdev avp,port=0f5a61cd-1b3f-45a4-966b-acf239b50423,id=hostnet0 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:10:3b:59,bus=pci.0,addr=0x3
-device
avp,port=a074662d-105c-4ba8-b002-07b4021d1964,id=avpa074662d-10,bus=pci.0,addr=0x4
-device avp,port=e5891f84-f258-4056-8119-f9bb15c55626,id=avpe58
91f84-f2,bus=pci.0,addr=0x5 -add-fd set=0,fd=31 -chardev
file,id=charserial0,path=/dev/fdset/0,append=on -device
isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device
isa-serial,chardev=charserial1,id=serial1 -device usb-tablet,id=input0 -vnc
0.0.0.0:0 -k en-us -device cirrus-vga,id=video0,
bus=pci.0,addr=0x2 -incoming defer -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -msg timestamp=on
char device redirected to /dev/pts/0 (label charserial1)
2017-06-06T16:29:46.291951Z kvm: get_pci_config_device: Bad config data: i=0x20
read: 0 device: c cmask: ff wmask: 0 w1cmask:0
2017-06-06T16:29:46.291983Z kvm: error while loading state for instance 0x0 of
device '0000:00:06.0/virtio-blk'
2017-06-06T16:29:46.292075Z kvm: load of migration failed: Invalid argument
