ide: Ignore reads during PIO in and writes during PIO out
This fixes https://bugs.launchpad.net/qemu/+bug/786209: When the DRQ_STAT bit is set, the IDE core permits both data reads and data writes, regardless of whether the current transfer was initiated as a read or write. This potentially leaks uninitialized host memory into the guest, if, before doing anything else to an IDE device, the guest begins a write transaction (e.g. WIN_WRITE), but then *reads* from the IO port instead of writing to it. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
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