Re: [PATCH 0/3] scsi: Add Hyper-V logical block provisioning quirks

[Sitsofe Wheeler]

On Sun, Oct 12, 2014 at 01:21:01AM +0000, KY Srinivasan wrote:
> 
> > -----Original Message-----
> > From: Jeff Leung [mailto:jleung@xxxxxxxxxxxxxx]
> > Sent: Saturday, October 11, 2014 1:22 PM
> > 
> > > On the current release of Windows (windows 10), we are advertising
> > > SPC3 compliance.
> > > We are ok with declaring compliance to SPC3 in our drivers.
> > If you are going to declare SPC3 compliance in the drivers, are you going to
> > put in checks to ensure that SPC-3 compliance doesn't get accidentally
> > enabled for hypervisors below Win10?
> > 
> > I do know for a fact that Ubuntu's kernels already force SPC3 compliance to
> > enable specific features such as TRIM on earlier versions of Hyper-V (Namely
> > Hyper-V 2012 and 2012 R2).
> You are right; Ubuntu has been carrying a patch  that was doing just
> this and this has been working without any issues on many earlier
> versions of Windows. (2012 and 2012 R2).  On windows 10 we don't need
> any changes in the Linux driver as the host itself is advertising SPC3
> compliance. Based on the testing we have done with Ubuntu, we are
> comfortable picking up that patch.

OK this seems to be the patch currently carried by Ubuntu: