KVM: Add halt polling documentation
There is currently no documentation about the halt polling capabilities of the kvm module. Add some documentation describing the mechanism as well as the module parameters to all better understanding of how halt polling should be used and the effect of tuning the module parameters. Signed-off-by: NSuraj Jitindar Singh <sjitindarsingh@gmail.com> Signed-off-by: NPaul Mackerras <paulus@ozlabs.org>
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