WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] Userland blkback?

To: Pim van Riezen <pi+lists@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Userland blkback?
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Fri, 12 Aug 2011 19:21:27 +0300
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 12 Aug 2011 09:24:44 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <690D0C12-DA8A-4377-885E-BD712F160DBD@xxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <690D0C12-DA8A-4377-885E-BD712F160DBD@xxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.18 (2008-05-17)
On Thu, Aug 11, 2011 at 02:53:47PM +0200, Pim van Riezen wrote:
> Good day,
> 
> I'm toying around with a kernel mode caching layer that, at the moment, 
> crashes into the ground if the driver is called from kernel space. 
> I've been toying around with pvops dom0 kernels in the 2.6.3x family 
> with the understanding that their lack of xen-blkback module would lead 
> to an automatic fallback to a userspace blockdevice backend.
>

Which exact 2.6.3x kernels/branches are you using? 
Jeremy's xen.git xen/stable-2.6.32.x branch definitely does have a xen-blkback 
driver included.

> Is there a secret switch to Xen 4.0/4.1 I need to be aware of to make this 
> magic happen? Or is this a missing feature and  does every pvops dom0-kernel 
> that is not 3.0.1 need backports for xen-blkback?
> 

Xen 4.0 won't work, but afaik Xen 4.1 should fallback to qemu/userspace block 
backend if kernel xen-blkback is not available.

-- Pasi




_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>