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In some circumstance guest driver got interrupted before inserting all args for one command, so that qemu get an invalid args and hang. GL patch doesn't consume these missing args, which further cause FIFO disorder. This commit reverts wrong behavior of GL patch, and introduces a qemu upstream patch to rewind FIFO unpon detecting incomplete command. [BUGID #111] fixed by this. Signed-off-by: Zhai Edwin <edwin.zhai@intel.com>