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RE: [Xen-devel] is a pure usermode backend possible?

To: "Keir Fraser" <keir@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] is a pure usermode backend possible?
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Wed, 24 Nov 2010 23:06:00 +1100
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] is a pure usermode backend possible?
> 
> Stefano posted a pure userspace blkback for qemu only yesterday.
Apparently
> it performs very well.
> 

I looked through the patch set, and it appears that this integrates
fairly closely to qemu. I assume that the xenstore state management is
handled somewhere inside qemu right?

Would it be possible to have a completely separate (from qemu) userspace
backend or would that leave an unclean termination in the event of the
userspace code crashing?

Is qemu modular in any way and could support a module build completely
separately? 

James

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