Bug 1031965

Summary:	unclear error message for x-data-plane=on specified for libiscsi storage disk
Product:	Red Hat Enterprise Linux 7	Reporter:	Sibiao Luo <sluo>
Component:	qemu-kvm	Assignee:	Stefan Hajnoczi <stefanha>
Status:	CLOSED WONTFIX	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.0	CC:	acathrow, chayang, juli, juzhang, michen, pbonzini, qzhang, virt-maint, xfu
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-12-06 14:09:11 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Sibiao Luo 2013-11-19 09:12:16 UTC

Description of problem:
fail to boot guest with x-data-plane=on specified for libiscsi storage disk, qemu will quit with warning message prompt 'drive is incompatible with x-data-plane, use format=raw,cache=none,aio=native'. We can fix it to work well or disable it with friendly warning message if not support it.
Also tried:
1.it can boot up guest with x-data-plane=off specified for libiscsi storage disk.
2.it can boot up guest with x-data-plane=on specified for local file storage disk.

Version-Release number of selected component (if applicable):
host info:
3.10.0-50.el7.x86_64
qemu-kvm-rhev-1.5.3-19.el7.x86_64
seabios-1.7.2.2-4.el7.x86_64
guest info:
rhel6.5 32bit/64bit
2.6.32-425.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.boot guest with x-data-plane=on specified for libiscsi storage disk.
e.g:/usr/libexec/qemu-kvm -M q35 -S -cpu SandyBridge -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -no-kvm-pit-reinjection...-drive file=iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/5,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=on,config-wce=off,drive=drive-data-disk,id=data-disk -iscsi id=iqn1
2.boot guest with x-data-plane=off specified for libiscsi storage disk.
e.g:/usr/libexec/qemu-kvm -M q35 -S -cpu SandyBridge -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -no-kvm-pit-reinjection...-drive file=iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/5,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=off,config-wce=off,drive=drive-data-disk,id=data-disk -iscsi id=iqn1
3.boot up guest with x-data-plane=on/off specified for local file storage disk.
e.g:/usr/libexec/qemu-kvm -M q35 -S -cpu SandyBridge -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -no-kvm-pit-reinjection...-drive file=/home/my-data-disk.raw,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=on,config-wce=off,drive=drive-data-disk,id=data-disk

Actual results:
after step 1, qemu will quit and fail to boot up.
QEMU 1.5.3 monitor - type 'help' for more information
(qemu) qemu-kvm: -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=on,config-wce=off,drive=drive-data-disk,id=data-disk: drive is incompatible with x-data-plane, use format=raw,cache=none,aio=native
qemu-kvm: -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=on,config-wce=off,drive=drive-data-disk,id=data-disk: Device initialization failed.
qemu-kvm: -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=on,config-wce=off,drive=drive-data-disk,id=data-disk: Device initialization failed.
qemu-kvm: -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=on,config-wce=off,drive=drive-data-disk,id=data-disk: Device 'virtio-blk-pci' could not be initialized
after step 2, it can boot up successfully.
after step 3, it can boot up successfully.

Expected results:
We can fix it to work well with x-data-plane=on specified for libiscsi storage disk or disable it with friendly warning message if not support it.

Additional info:

Comment 1 Sibiao Luo 2013-11-19 09:13:49 UTC

My qemu-kvm command line:
# /usr/libexec/qemu-kvm -M q35 -S -cpu SandyBridge -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -no-kvm-pit-reinjection -usb -device usb-tablet,id=input0 -name sluo -uuid 990ea161-6b67-47b2-b803-19fb01d30d10 -rtc base=localtime,clock=host,driftfix=slew -device virtio-serial-pci,id=virtio-serial0,max_ports=16,vectors=0,bus=pcie.0,addr=0x3 -chardev socket,id=channel1,path=/tmp/helloworld1,server,nowait -device virtserialport,chardev=channel1,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port1 -chardev socket,id=channel2,path=/tmp/helloworld2,server,nowait -device virtserialport,chardev=channel2,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port2 -drive file=/home/RHEL6.5-20131019.1_Server_x86_64.qcow2bk,if=none,id=drive-virtio-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,vectors=0,bus=pcie.0,addr=0x4,scsi=off,drive=drive-virtio-disk,id=virtio-disk,bootindex=1 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=00:01:02:03:04:05,bus=pcie.0,addr=0x5 -device virtio-balloon-pci,id=ballooning,bus=pcie.0,addr=0x6 -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -drive file=iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/5,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,bus=pcie.0,addr=0x7,scsi=off,x-data-plane=on,config-wce=off,drive=drive-data-disk,id=data-disk -iscsi id=iqn1 -k en-us -boot menu=on -qmp tcp:0:4444,server,nowait -serial unix:/tmp/ttyS0,server,nowait -vnc :1 -spice disable-ticketing,port=5931 -monitor stdio

Comment 2 Paolo Bonzini 2013-11-19 09:19:43 UTC

Dataplane only supports local storage right now.

Comment 4 Paolo Bonzini 2014-02-13 23:34:31 UTC

*** Bug 1064761 has been marked as a duplicate of this bug. ***