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Bug 920924

Summary:	guest only can detect one floppy when add two floppy to guest using '-drive...-global...' in cli
Product:	Red Hat Enterprise Linux 7	Reporter:	Sibiao Luo <sluo>
Component:	qemu-kvm	Assignee:	Virtualization Maintenance <virt-maint>
Status:	CLOSED NOTABUG	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.0	CC:	acathrow, chayang, flang, juzhang, kwolf, michen, pbonzini, qzhang, sluo, virt-maint
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:	2013-03-14 14:53:19 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:
Embargoed:

Description Sibiao Luo 2013-03-13 05:31:23 UTC

Description of problem:
boot guest with two floppy to guest using '-drive...-global...' method in cli, but guest only can detect one floppy in guest, both windows and rhel guest can hit this issue. btw, if use '-fda...-fdb...' method, the guest can detect them correctly.

Version-Release number of selected component (if applicable):
host info:
kernel-3.8.0-0.40.el7.x86_64
qemu-kvm-1.4.0-1.el7.x86_64
guest info:
kernel-3.8.0-0.40.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.boot guest with two floppies using '-drive...-global...' method.
e.g:...-drive file=/home/floppy1,if=none,id=drive-fdc0-0-0,format=raw -global isa-fdc.driveA=drive-fdc0-0-0 -drive file=/home/floppy2,if=none,id=drive-fdc0-1-0,format=raw -global isa-fdc.driveA=drive-fdc0-1-0
2.modprobe floppy in guest.
3.check the floppy number.
# ls -l /dev/fd*
  
Actual results:
after step 3, only one floppy can be detected in guest.
# ls -l /dev/fd*
lrwxrwxrwx. 1 root root     13 Mar 13 08:57 /dev/fd -> /proc/self/fd
brw-rw----. 1 root floppy 2, 0 Mar 13 08:57 /dev/fd0

Expected results:
two floppy should be detected correctly in guest.
# ls -l /dev/fd*
lrwxrwxrwx. 1 root root     13 Mar 13 08:57 /dev/fd -> /proc/self/fd
brw-rw----. 1 root floppy 2, 0 Mar 13 08:57 /dev/fd0
brw-rw----. 1 root floppy 2, 0 Mar 13 08:57 /dev/fd1

Additional info:
1.if i use '-fda /home/floppy1 -fdb /home/floppy2':
# ls -l /dev/fd*
lrwxrwxrwx. 1 root root     13 Mar 13 09:29 /dev/fd -> /proc/self/fd
brw-rw----. 1 root floppy 2, 0 Mar 13 09:29 /dev/fd0
brw-rw----. 1 root floppy 2, 1 Mar 13 09:29 /dev/fd1

2.if i use '-fda /home/floppy1 -drive file=/home/floppy2,if=none,id=drive-fdc0-0-0,format=raw -global isa-fdc.driveA=drive-fdc0-0-0'
# ls -l /dev/fd*
lrwxrwxrwx. 1 root root     13 Mar 13 09:28 /dev/fd -> /proc/self/fd
brw-rw----. 1 root floppy 2, 0 Mar 13 09:28 /dev/fd0

Comment 1 Sibiao Luo 2013-03-13 05:34:12 UTC

My qemu-kvm command line:
# /usr/libexec/qemu-kvm -S -M pc-i440fx-1.4 -cpu SandyBridge -enable-kvm -m 2048 -smp 4,sockets=2,cores=2,threads=1 -no-kvm-pit-reinjection -usb -device usb-tablet,id=input0 -device usb-mouse,id=mouse -name sluo-test -uuid b03eea94-a502-4142-b541-96f86473a07a -rtc base=localtime,clock=host,driftfix=slew -device virtio-serial-pci,id=virtio-serial0,max_ports=16,vectors=0,bus=pci.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/RHEL-Server-7.0-64-scsi.qcow2,if=none,id=drive-system-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop,serial=QEMU-DISK1 -device virtio-scsi-pci,id=scsi0,addr=0x4 -device scsi-hd,bus=scsi0.0,drive=drive-system-disk,id=system-disk,bootindex=1 -drive file=/home/my-data-disk.qcow2,if=none,id=drive-data-disk,format=qcow2,werror=stop,rerror=stop -device virtio-scsi-pci,id=scsi1,addr=0x5 -device scsi-hd,bus=scsi1.0,drive=drive-data-disk,id=data-disk -netdev tap,id=hostnet0,vhost=off,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=08:2E:5F:0A:1D:B1,bus=pci.0,addr=0x6,bootindex=2,event_idx=off -device virtio-balloon-pci,id=ballooning,bus=pci.0,addr=0x7 -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -serial unix:/tmp/ttyS0,server,nowait -k en-us -qmp tcp:0:4444,server,nowait -boot menu=on -vnc :1 -monitor stdio -drive file=/home/floppy1,if=none,id=drive-fdc0-0-0,format=raw -global isa-fdc.driveA=drive-fdc0-0-0 -drive file=/home/floppy2,if=none,id=drive-fdc0-1-0,format=raw -global isa-fdc.driveA=drive-fdc0-1-

Comment 2 Paolo Bonzini 2013-03-14 14:53:19 UTC

For two disks, the second -global option must be for isa-fdc.driveB.

Comment 3 Sibiao Luo 2013-03-15 01:44:20 UTC

(In reply to comment #2)
> For two disks, the second -global option must be for isa-fdc.driveB.
correct, I forget modify it, thx for your kindly reminds.
e.g:...-drive file=/home/floppy1,if=none,id=drive-fdc0-0-0,format=raw -global isa-fdc.driveA=drive-fdc0-0-0 -drive file=/home/floppy2,if=none,id=drive-fdc0-1-0,format=raw -global isa-fdc.driveB=drive-fdc0-1-0

# ls -l /dev/fd*
lrwxrwxrwx. 1 root root     13 Mar 15 05:42 /dev/fd -> /proc/self/fd
brw-rw----. 1 root floppy 2, 0 Mar 15 05:42 /dev/fd0
brw-rw----. 1 root floppy 2, 1 Mar 15 05:42 /dev/fd1