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[Xen-devel] Question about VBD interface

To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Question about VBD interface
From: David Lie <lie@xxxxxxxxxxxxxxxx>
Date: Thu, 4 Nov 2004 00:09:27 +0000 (UTC)
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I'm wondering how guest domains are provided access to disks.  I suppose 
Domain 0 has direct access to the actual hardware devices, and other domains 
simply see a virtualized block device.  However, when a guest domain wants to 
make a request to the disk, how does it get that request to Domain 0 and how 
does Domain 0 actually receive those requests?  There appears to be a virtual 
block device driver in drivers/xen/blkfront & blkback.  Is this the driver 
used by the guest Domains to access the virtualized devices?

My other question actually pertains to CoW support for disks.  I noticed that 
there was some work done on making a CoW driver that lived in the XenoLinux 
kernels.  Has this been made public?  Have there been any attempts to make one 
that provides that functionality in Xen itself?


David Lie

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