Xen devel - Aug 2009 - What opens /dev/cdrom when guest is started

Hi,
when I start HVM guest that has assigned physical cdrom device (/dev/cdrom), I
see there are two handles open. One is open by qemu-dm and is used by guest.
However, what holds second handle? This is hold for whole time guest is running.

Does anybody knows what opens /dev/cdrom during guest creation?

Regards,
Miroslav Rezanina


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On Wed, Aug 26, 2009 at 2:32 PM, Miroslav Rezanina<mrezanin@redhat.com>
wrote:
> Hi,
> when I start HVM guest that has assigned physical cdrom device
(/dev/cdrom), I see there are two handles open. One is open by qemu-dm and is
used by guest. However, what holds second handle? This is hold for whole time
guest is running.
Try losetup -a , it may have been setup as a loop device for use with
stubdom, that certainly happens with iso images

Andy
>
> Does anybody knows what opens /dev/cdrom during guest creation?
>
> Regards,
> Miroslav Rezanina
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
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> From: "Andrew Lyon" <andrew.lyon@gmail.com>
> To: "Miroslav Rezanina" <mrezanin@redhat.com>
> Cc: xen-devel@lists.xensource.com
> Sent: Wednesday, August 26, 2009 4:31:12 PM GMT +01:00 Amsterdam / Berlin /
Bern / Rome / Stockholm / Vienna
> Subject: Re: [Xen-devel] What opens /dev/cdrom when guest is started
>
> On Wed, Aug 26, 2009 at 2:32 PM, Miroslav
> Rezanina<mrezanin@redhat.com> wrote:
> > Hi,
> > when I start HVM guest that has assigned physical cdrom device
> (/dev/cdrom), I see there are two handles open. One is open by qemu-dm
> and is used by guest. However, what holds second handle? This is hold
> for whole time guest is running.
> 
> Try losetup -a , it may have been setup as a loop device for use with
> stubdom, that certainly happens with iso images
> 
> Andy
Hi Andy,

thanks for answer. Unfortunately this is not my case. There is only guest 
image mapped to loop device. 

Regards,
Mirek
> 
> >
> > Does anybody knows what opens /dev/cdrom during guest creation?
> >
> > Regards,
> > Miroslav Rezanina
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel
> >
-- 
Miroslav Rezanina
Software Engineer - Virtualization Team - XEN kernel


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