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

[Cornelia Huck]

On Wed, 12 Jun 2019 18:15:22 +0530
Pankaj Gupta <pagupta@xxxxxxxxxx> 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@xxxxxxxxxx>
> Reviewed-by: Yuval Shaia <yuval.shaia@xxxxxxxxxx>
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Acked-by: Jakub Staron <jstaron@xxxxxxxxxx>
> Tested-by: Jakub Staron <jstaron@xxxxxxxxxx>
> ---
>  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@xxxxxxxxxx>