Disabling ATA driver for IDE devices on Hyper-V

[Abhishek Gupta (LIS)]

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