Re: [PATCH] blockdev: add 'media=cdrom' argument to support usb cdrom emulated as cdrom

[Paolo Bonzini <pbonzini@redhat.com>]

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It should be like this:

-device usb-bot,id=bot0
-device scsi-{cd,hd},bus=bot0.0,drive=drive0

Libvirt has the code to generate the options for SCSI controllers, but
usb-bot only allows one disk attached to it so it's easier to make it a
<drive> element.

Paolo

Il sab 3 dic 2022, 13:52 Zhipeng Lu <luzhipeng@cestc.cn> ha scritto:

> Could you give the detail qemu cmdline about usb-bot?
>
> 在 2022/12/2 17:40, Paolo Bonzini 写道:
> > On 12/2/22 03:26, Zhipeng Lu wrote:
> >> NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
> >> sda             8:0    0  100M  1 disk
> >> vda           252:0    0   10G  0 disk
> >> ├─vda1        252:1    0    1G  0 part /boot
> >> └─vda2        252:2    0    9G  0 part
> >>    ├─rhel-root 253:0    0    8G  0 lvm  /
> >>    └─rhel-swap 253:1    0    1G  0 lvm  [SWAP]
> >> lshw -short|grep cdrom -i
> >> No cdrom.
> >>
> >> My patch is to solve this problem, usb cdrom emulated as cdrom.
> >
> > This is a libvirt bug, it should use usb-bot instead of usb-storage
> > together with -blockdev.  Then it can add a scsi-cd device below usb-bot.
> >
> > Paolo
> >
> >>
> >>
> >> 在 2022/12/1 23:35, Markus Armbruster 写道:
> >>> luzhipeng <luzhipeng@cestc.cn> writes:
> >>>
> >>>> From: zhipeng Lu <luzhipeng@cestc.cn>
> >>>>
> >>>> The drive interface supports media=cdrom so that the usb cdrom
> >>>> can be emulated as cdrom in qemu, but libvirt deprived the drive
> >>>> interface, so media=cdrom is added to the blockdev interface to
> >>>> support usb cdrom emulated as cdrom
> >>>>
> >>>> Signed-off-by: zhipeng Lu <luzhipeng@cestc.cn>
> >>>
> >>> What problem are you trying to solve?
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >
> >
> >
>
>
>

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