On Mon, Sep 22, 2014 at 6:59 AM, Wen Congyang <we...@cn.fujitsu.com> wrote:
> If we use blktap2, the correct file should be blktap device
> not the pdev_path.
>
> Signed-off-by: Wen Congyang <we...@cn.fujitsu.com>
> Cc: Shriram Rajagopalan <rshri...@cs.ubc.ca>
> Acked-by: Ian Campbell <ian.campb...@citrix.com>

If I'm reading this correctly, this is actually a fairly serious bug
in libxl -- it means that when using backend=tap with HVM domains,
qemu will actually *bypass entirely* the tapdisk process and access
the underlying file directly.

This should probably be backported, potentially as far back as 4.2.

 -George

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