linux-kernel - Re: [PATCH 2/3] mm: introduce memory type MEMORY_DEVICE_DEV

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Date:   Wed, 4 Jul 2018 07:50:18 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Zhang Yi <yi.z.zhang@...ux.intel.com>
Cc:     KVM list <kvm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Paolo Bonzini <pbonzini@...hat.com>, Jan Kara <jack@...e.cz>,
        Christoph Hellwig <hch@....de>,
        "Zhang, Yu C" <yu.c.zhang@...el.com>,
        Linux MM <linux-mm@...ck.org>, rkrcmar@...hat.com,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>
Subject: Re: [PATCH 2/3] mm: introduce memory type MEMORY_DEVICE_DEV_DAX

On Wed, Jul 4, 2018 at 8:30 AM, Zhang Yi <yi.z.zhang@...ux.intel.com> wrote:
> Currently, NVDIMM pages will be marked 'PageReserved'. However, unlike
> other reserved PFNs, pages on NVDIMM shall still behave like normal ones
> in many cases, i.e. when used as backend memory of KVM guest. This patch
> introduces a new memory type, MEMORY_DEVICE_DEV_DAX. Together with the
> existing type MEMORY_DEVICE_FS_DAX, we can differentiate the pages on
> NVDIMM with the normal reserved pages.
>
> Signed-off-by: Zhang Yi <yi.z.zhang@...ux.intel.com>
> Signed-off-by: Zhang Yu <yu.c.zhang@...ux.intel.com>
> ---
>  drivers/dax/pmem.c       | 1 +
>  include/linux/memremap.h | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
> index fd49b24..fb3f363 100644
> --- a/drivers/dax/pmem.c
> +++ b/drivers/dax/pmem.c
> @@ -111,6 +111,7 @@ static int dax_pmem_probe(struct device *dev)
>                 return rc;
>
>         dax_pmem->pgmap.ref = &dax_pmem->ref;
> +       dax_pmem->pgmap.type = MEMORY_DEVICE_DEV_DAX;
>         addr = devm_memremap_pages(dev, &dax_pmem->pgmap);
>         if (IS_ERR(addr))
>                 return PTR_ERR(addr);
> diff --git a/include/linux/memremap.h b/include/linux/memremap.h
> index 5ebfff6..4127bf7 100644
> --- a/include/linux/memremap.h
> +++ b/include/linux/memremap.h
> @@ -58,6 +58,7 @@ enum memory_type {
>         MEMORY_DEVICE_PRIVATE = 1,
>         MEMORY_DEVICE_PUBLIC,
>         MEMORY_DEVICE_FS_DAX,
> +       MEMORY_DEVICE_DEV_DAX,

Please add documentation for this new type to the comment block about
this definition.