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Date: Fri, 1 Feb 2019 21:26:25 -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 7:32 PM Dexuan Cui <decui@...rosoft.com> wrote:
>
> > From: Dan Williams <dan.j.williams@...el.com>
> > Sent: Friday, February 1, 2019 5:29 PM
> > ...
> > 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?
> Hyper-V Virtual NVDIMM can already work with Ubuntu 19.04 virtual machine
> running on Hyper-V, i.e. I can create a raw or fsdax namesapce, and create a
> xfs or ext4 file sysetm in /dev/pmem0p1, and mount the file system with and
> without "-o dax". The basic functionality is good.
Only in label-less mode apparently.
> My recent work is mainly for ndctl support, i.e. get the health info by ndctl,
> and use ndctl to monitor the error events (if applicable).
Right, but the recent fixes have exposed Linux to a labelled namespace
implementation that violates some of the driver's basic assumptions.
To preserve the level of operation you're currently seeing Linux might
need to add a hyper-v-specific quirk to force label-less operation.
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