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[Xen-devel] disks appearing twice in HVM domains

from [Nils Nieuwejaar]

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Subject:	[Xen-devel] disks appearing twice in HVM domains
From:	Nils Nieuwejaar <nils.nieuwejaar@xxxxxxx>
Date:	Wed, 5 Sep 2007 15:12:44 -0400
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When Xen creates an HVM domain, each network device appears in the domain
as either a PV device or an emulated physical device, depending on the
configuration.  Disks, on the other hand, are always made available twice:
once as an emulated physical device and once as a paravirtualized device.

Why is this?

I know this question has been raised before, but I don't think I ever saw a
real answer.  There was some speculation (e.g., "it makes developing PV
drivers easier?"), but nothing definitive.

Nils

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