Re: [Qemu-devel] [PATCH v2 1/3] scsi-disk: Allow overriding SCSI INQUIRY removable bit

[Kevin Wolf <kwolf@redhat.com>]

Am 21.01.2011 11:45, schrieb Stefan Hajnoczi:
> On Tue, Jan 18, 2011 at 12:06 PM, Stefan Hajnoczi <stefanha@gmail.com> wrote:
>> On Tue, Jan 18, 2011 at 11:39 AM, Kevin Wolf <kwolf@redhat.com> wrote:
>>> Am 18.01.2011 11:10, schrieb Stefan Hajnoczi:
>>>> Provide the "removable" qdev property bit to override the SCSI INQUIRY
>>>> removable (RMB) bit for non-CDROM devices.  This will be used by USB
>>>> Mass Storage Devices, which sometimes have this guest-visible bit set
>>>> and sometimes do not.  They therefore requires a means for user
>>>> configuration.
>>>>
>>>> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
>>>
>>> Should we print an error message when the user tries to make a CD-ROM
>>> non-removable instead of silently ignoring the option?
>>
>> Good point.  I will add a check in scsi_disk_initfn() for v3.
> 
> Actually this case is hard to check against.  The removable property
> is a boolean that defaults to false.  We can't detect the difference
> between default, cleared, or set.

Hm, I see... Maybe we should make scsi-disk and scsi-cdrom different
devices in the long run, then scsi-cdrom could default to true (or
rather not have the property at all).

> I'm sending out a new version of the patch series that updates
> docs/qdev-device-use.txt to describe how the removable property works.

Okay, let's just document how it works.

Kevin