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From: Jan Kara <jack@suse.cz>
To: Zhang Yi <yi.z.zhang@linux.intel.com>
Cc: jack@suse.cz, yu.c.zhang@intel.com, kvm@vger.kernel.org,
	linux-nvdimm@lists.01.org, rkrcmar@redhat.com,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	pbonzini@redhat.com, hch@lst.de, yi.z.zhang@intel.com
Subject: Re: [PATCH V2 3/4] mm: add a function to differentiate the pages is from DAX device memory
Date: Tue, 7 Aug 2018 11:13:57 +0200	[thread overview]
Message-ID: <20180807091357.zxanrttlp3ml7mq2@quack2.suse.cz> (raw)
In-Reply-To: <a0d220839ce0414f13e9394dffcd9abe8689dafe.1531241281.git.yi.z.zhang@linux.intel.com>

On Wed 11-07-18 01:03:51, Zhang Yi wrote:
> DAX driver hotplug the device memory and move it to memory zone, these
> pages will be marked reserved flag, however, some other kernel componet
> will misconceive these pages are reserved mmio (ex: we map these dev_dax
> or fs_dax pages to kvm for DIMM/NVDIMM backend). Together with the type
> MEMORY_DEVICE_FS_DAX, we can use is_dax_page() to differentiate the pages
> is DAX device memory or not.
> 
> Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com>
> Signed-off-by: Zhang Yu <yu.c.zhang@linux.intel.com>

The patch looks OK to me but I don't really feel too confident about this
part of the kernel... But feel free to add my:

Acked-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  include/linux/mm.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 6e19265..9f0f690 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -856,6 +856,13 @@ static inline bool is_device_public_page(const struct page *page)
>  		page->pgmap->type == MEMORY_DEVICE_PUBLIC;
>  }
>  
> +static inline bool is_dax_page(const struct page *page)
> +{
> +	return is_zone_device_page(page) &&
> +		(page->pgmap->type == MEMORY_DEVICE_FS_DAX ||
> +		page->pgmap->type == MEMORY_DEVICE_DEV_DAX);
> +}
> +
>  #else /* CONFIG_DEV_PAGEMAP_OPS */
>  static inline void dev_pagemap_get_ops(void)
>  {
> @@ -879,6 +886,11 @@ static inline bool is_device_public_page(const struct page *page)
>  {
>  	return false;
>  }
> +
> +static inline bool is_dax_page(const struct page *page)
> +{
> +	return false;
> +}
>  #endif /* CONFIG_DEV_PAGEMAP_OPS */
>  
>  static inline void get_page(struct page *page)
> -- 
> 2.7.4
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR
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  reply	other threads:[~2018-08-07  9:13 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-10 17:01 [PATCH V2 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Zhang Yi
2018-07-10 17:01 ` [PATCH V2 1/4] kvm: remove redundant reserved page check Zhang Yi
2018-07-10 17:01 ` [PATCH V2 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Zhang Yi
2018-08-07  9:11   ` Jan Kara
2018-08-08  9:22     ` Zhang,Yi
2018-07-10 17:03 ` [PATCH V2 3/4] mm: add a function to differentiate the pages is from DAX device memory Zhang Yi
2018-08-07  9:13   ` Jan Kara [this message]
     [not found] ` <cover.1531241281.git.yi.z.zhang-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-07-10 17:03   ` Zhang Yi
2018-07-10 17:04 ` [PATCH V2 4/4] kvm: add a check if pfn is from NVDIMM pmem Zhang Yi
2018-07-13 14:29 ` [PATCH V2 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Zhang,Yi
2018-07-20 14:11 ` Zhang,Yi
2018-07-20  8:32   ` Paolo Bonzini
2018-07-20 16:24     ` Zhang,Yi

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