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Re: [Xen-users] Changing CD Images (ISO files) in QEMU Console

To: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>
Subject: Re: [Xen-users] Changing CD Images (ISO files) in QEMU Console
From: Andrew Lyon <andrew.lyon@xxxxxxxxx>
Date: Wed, 11 Nov 2009 19:25:29 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
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On Mon, Nov 2, 2009 at 12:52 PM, Mr. Teo En Ming (Zhang Enming)
<space.time.universe@xxxxxxxxx> wrote:
> Hi,
> I have tried to change CD ISO images during a HVM install using the
> following commands but it doesn't work. After changing the CD ISO image, it
> doesn't detect the new ISO image.
> (qemu) eject -f hdc
> (qemu) change hdc /media/hitachi/cd-rom-image.iso
> Any ideas?
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe@xxxxxxxxx
> MSN: teoenming@xxxxxxxxxxx
> Mobile Phone (SingTel): +65-9648-9798
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Age: 31 (as at 30 Oct 2009)
> Height: 1.78 meters
> Race: Chinese
> Dialect: Hokkien
> Street: Bedok Reservoir Road
> Country: Singapore
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I use a different method to change iso image for hvm domU:

Use xm block-list <domid> to find the cdrom be-path for the domain, for example:

 xm block-list 5
Vdev  BE handle state evt-ch ring-ref BE-path
768    0    0     4      9      16383 /local/domain/0/backend/vbd/5/768
5632   0    0     1      -1     -1    /local/domain/0/backend/vbd/5/5632

Having identified the cdrom device (5632) you can check what iso image
it is connected to:

xenstore-read /local/domain/0/backend/vbd/5/5632/params

(nothing returned)

To connect a new iso image:

xenstore-write /local/domain/0/backend/vbd/5/5632/params

And you can now see that it is connected:

xenstore-read /local/domain/0/backend/vbd/5/5632/params

This method works with both emulated devices and with gplpv drivers.


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