[Xen-devel] Question about VBD interface

[David Lie <lie@xxxxxxxxxxxxxxxx>]

Hello:

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?

Thanks,

David Lie



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