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RE: [Xen-users] A fundamental doubt.

  • To: "Anuj Bhatt" <anuj.bhatt@xxxxxxxxx>
  • From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
  • Date: Thu, 5 Apr 2007 15:27:16 +0200
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 05 Apr 2007 06:26:44 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Acd3hbKdaZpjSBRrThmBkYhxB+G4pwAABIJA
  • Thread-topic: [Xen-users] A fundamental doubt.


> -----Original Message-----
> From: Anuj Bhatt [mailto:anuj.bhatt@xxxxxxxxx] 
> Sent: 05 April 2007 14:24
> To: Petersson, Mats
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] A fundamental doubt.
> Hi,
> On 4/5/07, Petersson, Mats <Mats.Petersson@xxxxxxx> wrote:
> > Event channels are used to communicate between domains, such as Dom0
> > telling DomU that the disk-read it just asked for is 
> completed, or from
> > DomU to Dom0 to say "I've got another disk operation I 
> would like you to
> > perform".
> Firstly, thanks for the prompt reply. Now, here's a related doubt. If
> I insert a USB drive when  I'm on a xen host (my dom0). Does the xen
> guest recognize it like on VMWare. I've noticed on VMWare that if a
> pen drive is inserted it shows up on both, the guest and the host. So
> this mount is treated via an event channel or a hypercall or both? If
> it's recognized on both, is there some way I can only get it
> identified on the guest? I haven't tried it yet since I just switched
> to a new box.

Xen doesn't automatically export pen-drives (or any other removable
media) to the guests. You can manually attach a block-device (e.g. a
pen-drive) with "xm block-attach dom location". If you want to share the
device, you'll need to have it in read-only mode, as Xen doesn't support
(as a general rule) multiple writes to the same device. 

If you do "xm block-attach" there will be both hypercalls and events
involved in informing the guest of the new device appearing. 

> Regards,
> Anuj Bhatt.

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