Save 3MB ioport table memory (Samuel Thibault)
Save 1.5MB (32bit) or 3MB (64bit) memory by keeping ioport tables
sparse and use a test against NULL instead.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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