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The 'val' field in the packet is byte-aligned (because it is part of a packed struct), but the pointer argument to kdd_rdmsr() has the normal alignment constraints for a uint64_t *. Use a local variable to make sure the passed pointer has the correct alignment. Reported-by: Roger Pau Monné <roger.pau@citrix.com> Signed-off-by: Tim Deegan <tim@xen.org> Acked-by: Roger Pau Monné <roger.pau@citrix.com> Tested-by: Roger Pau Monné <roger.pau@citrix.com>