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In particular, initialising %dr6 with the value 0 is buggy, because on hardware supporting Transactional Memory, it will cause the sticky RTM bit to be asserted, even though a debug exception from a transaction hasn't actually been observed. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>