Re: [Qemu-devel] [PATCH] qmp: extend QMP to provide read/write access to physical memory

[Eric Blake <eblake@redhat.com>]

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On 12/04/2014 11:40 AM, Bryan D. Payne wrote:
>>
>> Off the top of my head, I know the -tpm command line options (related to
>> the 'query-tpm' QMP command) do this; look at hw/tpm/tpm_passthrough.c
>> for that implementation.
> 
> 
> So now I do see what you are talking about.  But I don't think it applies
> to this patch.  I'm not using qemu_open in this patch.

But my argument is that you SHOULD be using qemu_open, so that someone
can have the option of passing in a pre-opened fd rather than having
qemu open it.  It matters for cases like libvirt where qemu is running
under restricted privileges, and it is easier to have libvirt pass in a
pre-opened fd than to figure out how to give qemu the privileges it
needs to open the file itself.  Even if you don't think your feature
will be exposed by libvirt any time soon, it's still worth designing
things to be flexible from the beginning.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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