Re: [PATCH] mptfusion: enable no_write_same in scsi_host_template

From: Chris J Arges
Date: Mon Sep 22 2014 - 14:17:09 EST

On 09/22/2014 01:02 PM, Christoph Hellwig wrote:
> On Mon, Sep 22, 2014 at 12:56:59PM -0500, Chris J Arges wrote:
>> When using a virtual SCSI disk in a VMWare VM if blkdev_issue_zeroout is used
>> data can be improperly zeroed out using the mptfusion driver. This patch
>> disables write_same for this driver which ensures that manual zeroing out
>> is used instead.
> Does this affet real hardware or is it a VMware bug? If it's just the
> latter we should simply blacklist VMware.
I've only been able to reproduce this on VMWare. There is a pretty
straightforward reproducer in the BugLink if there is any interest in
verifying on hardware.

How would you recommending blacklisting only VMWare guests in this case?

--chris j arges
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