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Bug 1690214 - IO throttling parameters failed to transfer from the original cdrom to the changed one
Summary: IO throttling parameters failed to transfer from the original cdrom to the ch...
Status: NEW
Alias: None
Product: Red Hat Enterprise Linux Advanced Virtualization
Classification: Red Hat
Component: qemu-kvm
Version: ---
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Stefan Hajnoczi
QA Contact: CongLi
Depends On:
TreeView+ depends on / blocked
Reported: 2019-03-19 03:03 UTC by lchai
Modified: 2019-04-12 23:12 UTC (History)
7 users (show)

Fixed In Version:
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Type: Bug
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Description lchai 2019-03-19 03:03:13 UTC
Description of problem:
Set io throttling parameters on a cdrom, after the cdrom was changed, the settings was not tranferred to the new cdrom.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Boot up a guest with a cdrom virtual disk and set its io throttling parameters at the same time:
/usr/libexec/qemu-kvm -M q35 \
	-S \
	-cpu SandyBridge \
	-enable-kvm \
	-m 4G \
	-smp 4 \
	-object iothread,id=iothread0 \
	-object throttle-group,id=foo,x-bps-total=1024000,x-iops-total=100 \
	-rtc base=utc,clock=host,driftfix=slew \
	-device pcie-root-port,id=pcie.0-root-port-2,slot=2,chassis=2,addr=0x2,bus=pcie.0 \
	-device pcie-root-port,id=pcie.0-root-port-3,slot=3,chassis=3,addr=0x3,bus=pcie.0 \
	-device pcie-root-port,id=pcie.0-root-port-4,slot=4,chassis=4,addr=0x4,bus=pcie.0 \
	-blockdev driver=file,,,filename=/home/kvm_autotest_root/images/rhel77-64-virtio.qcow2,node-name=win_disk \
	-blockdev driver=qcow2,node-name=drive_win,file=win_disk \
	-device virtio-blk-pci,drive=drive_win,id=win1,write-cache=on,bus=pcie.0-root-port-2,addr=0x0,iothread=iothread0 \
	-device virtio-scsi-pci,id=scsi0,bus=pcie.0-root-port-4,addr=0x0 \
	***-blockdev driver=throttle,throttle-group=foo,,,file.filename=/home/kvm_autotest_root/images/cd1,node-name=cdrom1,file.driver=file,read-only=on \
	-device scsi-cd,drive=cdrom1,id=cd1 \***
	-device virtio-net-pci,mac=6c:ae:8b:20:80:59,id=netdev1,vectors=4,netdev=net1,bus=pcie.0-root-port-3 -netdev tap,id=net1,vhost=on \
	-qmp tcp:0:4446,server,nowait \
	-vga qxl \
	-vnc :4 \
	-monitor stdio \
	-boot menu=on

2. Check the io throttling parameters in hmp
(qemu) info block
cdrom1: json:{"throttle-group": "foo", "driver": "throttle", "file": {"driver": "file", "filename": "/home/kvm_autotest_root/images/cd1"}} (throttle, read-only)
    Attached to:      cd1
    Removable device: locked, tray closed
    Cache mode:       writeback, direct

3. Try to change the cdrom in qmp

Open the tray:
{ 'execute': 'blockdev-open-tray','arguments':{'id':'cd1'}}
{"return": {}}
{"timestamp": {"seconds": 1552962904, "microseconds": 375012}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "", "tray-open": true, "id": "cd1"}}

change medium:
{"timestamp": {"seconds": 1552962946, "microseconds": 38931}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "", "tray-open": false, "id": "cd1"}}
{"return": {}}

4. Re-check the io throttling settings
(qemu) info block
#block205: /home/kvm_autotest_root/images/cd2 (qcow2, read-only)
    Attached to:      cd1
    Removable device: locked, tray closed
    Cache mode:       writeback, direct

Actual results:
cdrom was changed successfully, but no io throttling paremeters was set on the new cdrom.

Expected results:
cdrom was changed successfully, and the io throttling parameters was same as beform.

Additional info:
The block device node name changed after the operation - "change cdrom".

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