linux-kernel - Re: [PATCH v2] nfit: add Hyper-V NVDIMM DSM command set to white list

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Date:   Fri, 1 Feb 2019 21:27:47 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     Josh Poulson <jopoulso@...rosoft.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "driverdev-devel@...uxdriverproject.org" 
        <driverdev-devel@...uxdriverproject.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Ross Zwisler <zwisler@...nel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>, Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v2] nfit: add Hyper-V NVDIMM DSM command set to white list

On Fri, Feb 1, 2019 at 6:17 PM Dexuan Cui <decui@...rosoft.com> wrote:
> > From: Dan Williams <dan.j.williams@...el.com>
[..]
> > Honestly, the quickest path to something functional for Linux is to
> > simply delete the _LSR support and use raw mode defined namespaces.
> > Why have labels if they are read-only and the region is sufficient for
> > defining boundaries?
>
> Just now Hyper-V team confirmed _LSW is not supported.
>
> But with Ubuntu 19.04 kernel (4.18.0-11-generic), I'm able to run the commands
> without any issue:

This is because Ubuntu is running in "label-less" mode. So all the
writes it is performing for namespace reconfiguration are just going
to the data-space of the region, not the labels.