linux-ext4 - Re: [PATCH v13 2/7] virtio-pmem: Add virtio pmem driver

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Date:   Wed, 12 Jun 2019 16:20:12 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Pankaj Gupta <pagupta@...hat.com>
Cc:     dm-devel@...hat.com, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-acpi@...r.kernel.org,
        qemu-devel@...gnu.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, dan.j.williams@...el.com,
        zwisler@...nel.org, vishal.l.verma@...el.com, dave.jiang@...el.com,
        mst@...hat.com, jasowang@...hat.com, willy@...radead.org,
        rjw@...ysocki.net, hch@...radead.org, lenb@...nel.org,
        jack@...e.cz, tytso@....edu, adilger.kernel@...ger.ca,
        darrick.wong@...cle.com, lcapitulino@...hat.com, kwolf@...hat.com,
        imammedo@...hat.com, jmoyer@...hat.com, nilal@...hat.com,
        riel@...riel.com, stefanha@...hat.com, aarcange@...hat.com,
        david@...hat.com, david@...morbit.com,
        xiaoguangrong.eric@...il.com, pbonzini@...hat.com,
        yuval.shaia@...cle.com, kilobyte@...band.pl, jstaron@...gle.com,
        rdunlap@...radead.org, snitzer@...hat.com
Subject: Re: [PATCH v13 2/7] virtio-pmem: Add virtio pmem driver

On Wed, 12 Jun 2019 18:15:22 +0530
Pankaj Gupta <pagupta@...hat.com> wrote:

> This patch adds virtio-pmem driver for KVM guest.
> 
> Guest reads the persistent memory range information from
> Qemu over VIRTIO and registers it on nvdimm_bus. It also
> creates a nd_region object with the persistent memory
> range information so that existing 'nvdimm/pmem' driver
> can reserve this into system memory map. This way
> 'virtio-pmem' driver uses existing functionality of pmem
> driver to register persistent memory compatible for DAX
> capable filesystems.
> 
> This also provides function to perform guest flush over
> VIRTIO from 'pmem' driver when userspace performs flush
> on DAX memory range.
> 
> Signed-off-by: Pankaj Gupta <pagupta@...hat.com>
> Reviewed-by: Yuval Shaia <yuval.shaia@...cle.com>
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> Acked-by: Jakub Staron <jstaron@...gle.com>
> Tested-by: Jakub Staron <jstaron@...gle.com>
> ---
>  drivers/nvdimm/Makefile          |   1 +
>  drivers/nvdimm/nd_virtio.c       | 125 +++++++++++++++++++++++++++++++
>  drivers/nvdimm/virtio_pmem.c     | 122 ++++++++++++++++++++++++++++++
>  drivers/nvdimm/virtio_pmem.h     |  55 ++++++++++++++
>  drivers/virtio/Kconfig           |  11 +++
>  include/uapi/linux/virtio_ids.h  |   1 +
>  include/uapi/linux/virtio_pmem.h |  35 +++++++++
>  7 files changed, 350 insertions(+)
>  create mode 100644 drivers/nvdimm/nd_virtio.c
>  create mode 100644 drivers/nvdimm/virtio_pmem.c
>  create mode 100644 drivers/nvdimm/virtio_pmem.h
>  create mode 100644 include/uapi/linux/virtio_pmem.h

Reviewed-by: Cornelia Huck <cohuck@...hat.com>