linux-kernel - Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests

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Date:	Thu, 24 Jul 2014 17:24:27 +0100
From:	Sitsofe Wheeler <sitsofe@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	ohering@...e.com, apw@...onical.com, jasowang@...hat.com,
	jbottomley@...allels.com, linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests

On Thu, Jul 24, 2014 at 08:35:13AM -0700, Christoph Hellwig wrote:
> On Thu, Jul 24, 2014 at 08:34:19AM -0700, Christoph Hellwig wrote:
> > I agree - I'd like to pull in KY's simple fix as soon as I get a second
> > review for it.
> 
> Ok, looks like I just got that from Hannes.  Let's see if there's more
> to be done for the pass through case, but I'd rather wait for the next
> window for that.

There's nothing Linux can do for today's Hyper-V passthrough wrt to
automatically turning on discard on my SATA SSD.

Martin explained that vendors often disable UNMAP/WRITE SAME to DSM TRIM
translation on purpose and/or have explicit device whitelists/blacklists
for those devices they want to support. It could be that Microsoft are
doing something similar (although it might be interesting to know how a
Windows 2012 guest on Hyper-V handles things).

-- 
Sitsofe | http://sucs.org/~sits/
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