Hi,

There was some discussion between Larry Melia and Alexander Motin
on this and related topics a few months ago.  Here are some relevant
threads:

http://lists.freebsd.org/pipermail/freebsd-virtualization/2013-April/001180.html
http://lists.freebsd.org/pipermail/freebsd-virtualization/2013-May/001281.html
http://lists.freebsd.org/pipermail/freebsd-virtualization/2013-June/001297.html

If you are continuing Larry's work, and can get feedback from
Alexander, that would be great.
--
Craig




On Mon, Sep 30, 2013 at 2:02 PM, Abhishek Gupta (LIS) <abgu...@microsoft.com
> wrote:

> Hi folks,
>
> This may have been asked before but the solution we have currently is less
> than ideal. Please bear with me on the repetition and provide any
> suggestions you may have.
>
> One of the issues with Hyper-V is that it does not virtualize the CD
> device and therefore we rely on the ATA driver in the guest operating
> system to manage CDROMs. What we would like to do is disable the ATA driver
> for all device types except the CDROM in the presence of Hyper-V. Can
> someone help us in answering the following in this regard:
>
>
> a)      What is the correct location in the FreeBSD ATA code where we can
> put in selective disabling?
>
> b)      Is this a good approach? Is there something cleaner you can think
> of?
>
> As of now we have implemented a disengage driver that disables ATA driver
> permanently on Hyper-V. However this is less than desirable and we are
> looking for a better solution. Please let us know if you have some thoughts.
>
> Thanks,
> Abhishek
>
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