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Description of problem: boot guest with attaching multi CD-ROMs to guest with IDE or SCSI-CD interface, the seabios can list the multi cdroms in device list correctly, but only one cdrom can be detected in guest. BTW, both the PC and Q35 machine type can hit this issue. Version-Release number of selected component (if applicable): host info: 3.10.0-34.el7.x86_64 qemu-kvm-1.5.3-9.el7.x86_64 seabios-bin-1.7.2.2-2.el7.noarch guest info: 3.10.0-34.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.boot guest with attaching multi CD-ROMs to guest with SCSI-CD interface. e.g1:...-drive file=/home/cdrom1.iso,if=none,id=cd-rom1,media=cdrom,format=raw,readonly=on -device virtio-scsi-pci,id=sluo1 -device scsi-cd,drive=cd-rom1,id=cd1,bus=sluo1.0 -drive file=/home/cdrom2.iso,if=none,id=cd-rom2,media=cdrom,format=raw,readonly=on -device virtio-scsi-pci,id=sluo2 -device scsi-cd,bus=sluo2.0,drive=cd-rom2,id=cd2 (qemu) info block drive-virtio-disk: removable=0 io-status=ok file=/home/RHEL-Server-7.0-64.qcow2 ro=0 drv=qcow2 encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0 cd-rom1: removable=1 locked=1 tray-open=0 io-status=ok file=/home/cdrom1.iso ro=1 drv=raw encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0 cd-rom2: removable=1 locked=1 tray-open=0 io-status=ok file=/home/cdrom2.iso ro=1 drv=raw encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0 floppy0: removable=1 locked=0 tray-open=0 [not inserted] sd0: removable=1 locked=0 tray-open=0 [not inserted] 2.check the cdroms in guest. # ls -lh /dev/cdrom* 3.boot guest with attaching multi CD-ROMs to guest with IDE interface. e.g2:...-drive file=/home/cdrom1.iso,if=none,id=cd-rom1,media=cdrom,format=raw,readonly=on -device ide-drive,bus=ide.0,unit=0,drive=cd-rom1,id=cd1 -drive file=/home/cdrom2.iso,if=none,id=cd-rom2,media=cdrom,format=raw,readonly=on -device ide-drive,bus=ide.0,unit=1,drive=cd-rom2,id=cd2 (qemu) info block drive-virtio-disk: removable=0 io-status=ok file=/home/RHEL-Server-7.0-64.qcow2 ro=0 drv=qcow2 encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0 cd-rom1: removable=1 locked=0 tray-open=0 io-status=ok file=/home/cdrom1.iso ro=1 drv=raw encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0 cd-rom2: removable=1 locked=0 tray-open=0 io-status=ok file=/home/cdrom2.iso ro=1 drv=raw encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0 floppy0: removable=1 locked=0 tray-open=0 [not inserted] sd0: removable=1 locked=0 tray-open=0 [not inserted] 4.check the cdroms in guest. # ls -lh /dev/cdrom* Actual results: after step 2, only one cdrom can be detected in guest, like: # ls -lh /dev/cdrom* lrwxrwxrwx. 1 root root 3 Oct 19 14:16 /dev/cdrom -> sr0 after step 4, only one cdrom can be detected in guest, like: # ls -lh /dev/cdrom* lrwxrwxrwx. 1 root root 3 Oct 20 3:54 /dev/cdrom -> sr0 Expected results: after step 2, if use the scsi-cd interface, the muti-cdroms should be detected in guest correctly. About the default IDE cdrom device disappear when attach a emulated SCSI cdrom(scsi-cd), please refer to bug 974910. # ls -lh /dev/cdrom* lrwxrwxrwx. 1 root root 3 Oct 20 03:17 /dev/cdrom -> sr0 <--------bug 974910 lrwxrwxrwx. 1 root root 3 Oct 20 03:17 /dev/cdrom1 -> sr2 lrwxrwxrwx. 1 root root 3 Oct 20 03:17 /dev/cdrom2 -> sr1 after step 4, if use the ide interface, it should be like: # ls -lh /dev/cdrom* lrwxrwxrwx. 1 root root 3 Oct 20 02:09 /dev/cdrom1 -> sr0 lrwxrwxrwx. 1 root root 3 Oct 20 02:09 /dev/cdrom2 -> sr1 Additional info:
Please try again with a RHEL6 guest. I cannot reproduce it with kernel-2.6.32-258.el6.x86_64 udev-147-2.35.el6.x86-64 If it works, please reassign to systemd. Also please test with a single virtio-scsi-pci controller and both disks attached to that controller.
(In reply to Paolo Bonzini from comment #1) > Please try again with a RHEL6 guest. I cannot reproduce it with > > kernel-2.6.32-258.el6.x86_64 > udev-147-2.35.el6.x86-64 Yes, if use rhel6.5 guest that did not hit it. host info: # uname -r && rpm -q qemu-kvm 2.6.32-424.el6.x86_64 qemu-kvm-0.12.1.2-2.414.el6.x86_64 guest info: kernel-2.6.32-424.el6.x86_64 udev-147-2.50.el6.x86-64 e.g:...-drive file=/home/cdrom1.iso,if=none,id=cd-rom1,media=cdrom,format=raw,readonly=on -device virtio-scsi-pci,id=sluo1 -device scsi-cd,drive=cd-rom1,id=cd1,bus=sluo1.0 -drive file=/home/cdrom2.iso,if=none,id=cd-rom2,media=cdrom,format=raw,readonly=on -device virtio-scsi-pci,id=sluo2 -device scsi-cd,bus=sluo2.0,drive=cd-rom2,id=cd2 # ls -lh /dev/cdrom* lrwxrwxrwx. 1 root root 3 Oct 24 22:09 /dev/cdrom1 -> sr0 lrwxrwxrwx. 1 root root 3 Oct 24 22:09 /dev/cdrom2 -> sr1 e.2:...-drive file=/home/cdrom1.iso,if=none,id=cd-rom1,media=cdrom,format=raw,readonly=on -device ide-drive,bus=ide.0,unit=0,drive=cd-rom1,id=cd1 -drive file=/home/cdrom2.iso,if=none,id=cd-rom2,media=cdrom,format=raw,readonly=on -device ide-drive,bus=ide.0,unit=1,drive=cd-rom2,id=cd2 # ls -lh /dev/cdrom* lrwxrwxrwx. 1 root root 3 Oct 24 22:15 /dev/cdrom5 -> sr0 lrwxrwxrwx. 1 root root 3 Oct 24 22:15 /dev/cdrom6 -> sr1 > If it works, please reassign to systemd. Also please test with a single > virtio-scsi-pci controller and both disks attached to that controller. If use single virtio-scsi-pci controller attached two cd-rom via scsi-cd wiht rhel6.5 guest that also did not meet such issue. Best Regards, sluo
Current udev does not provide cdrom[0-9] symbolic links anymore.
Harald, please make sure that there is documentation about this (Release Notes?).