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KVM currently validates the size of the VPA registered by the client against sizeof(struct lppaca), however we align (and therefore size) that struct to 1kB to avoid crossing a 4kB boundary in the client. PAPR calls for sizes >= 640 bytes to be accepted. Hard code this with a comment. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>