Re: [Xen-devel] [RFC Patch v4 3/9] pass correct file to qemu if we use blktap2

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Dec 11, 2014 at 04:45:09PM +0000, George Dunlap wrote:
> On Mon, Sep 22, 2014 at 6:59 AM, Wen Congyang <wency@xxxxxxxxxxxxxx> wrote:
> > If we use blktap2, the correct file should be blktap device
> > not the pdev_path.
> >
> > Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
> > Cc: Shriram Rajagopalan <rshriram@xxxxxxxxx>
> > Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> 
> 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.
> 

Is it because qemu will corrupt the underlying file so it's very
serious? 

Wei.

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