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Impact of enabling SR-IOV with Oracle VM

in Oracle VM (OVM) (MOSC) Question
Hello,
We observe the following behavior on a SUN X3-2B blade which has 32 vCPUs and has Oracle VM 3.1.1 installed. The DOMU VM uses OEL 5.6.

Scenario 0:
SR-IOV Disabled
DOM0 # VCPUs = 32
DOMU # VCPUs = 32
The system is perfectly stable.

Scenario 1:
SR-IOV Enabled
DOM0 # VCPUs = 32
DOMU # VCPUs = 32
The system is unstable and reboots.

Scenario 2:
SR-IOV Enabled
DOM0 # VCPUs = 1
DOMU # VCPUs = 31 (pinned)
The system is unstable and reboots. High CPU usage is seen in DOM0.

Scenario 3:
SR-IOV Enabled
DOM0 # VCPUs = 2
DOMU # VCPUs = 30 (pinned)
The system is perfectly stable, DOM0 has low CPU usage.

Is it a requirement for enabling SR-IOV that DOM0 must be fenced-off from the CPUs used by DOMU?

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