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The problem is that qemu's implementation of AHCI doesn't support migrations.

*** This bug has been marked as a duplicate of bug 901631 ***

Hi, peter
We notice that this bug duplicate of bug 901631, but it is a qemu-kvm bug and close won't fix.
shall we reduplicate this to qemu-kvm-rhev related bug 953062 or 1170122, and waiting for the patch to fix?

Um, since this was closed as duplicate I don't think it's necessary open a new one. Especially since there is already a bug tracking it in qemu.