neel da1ce8990c Add support for MSI-X interrupts in the virtio block device and make that
the default.

The current behavior of advertising a single MSI vector can be requested by
setting the environment variable "BHYVE_USE_MSI" to "yes". The use of MSI
is not compliant with the virtio specification and will be eventually phased
out.

Submitted by:	Gopakumar T
Obtained from:	NetApp
2013-02-01 16:58:59 +00:00
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