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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
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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

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