linux-kernel - Re: [PATCH 5/8] xen/gntdev: Add initial support for dma-buf UAPI

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Date:   Wed, 30 May 2018 09:52:07 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        jgross@...e.com, boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Cc:     daniel.vetter@...el.com, dongwon.kim@...el.com,
        matthew.d.roper@...el.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: Re: [PATCH 5/8] xen/gntdev: Add initial support for dma-buf UAPI

On 05/25/2018 06:33 PM, Oleksandr Andrushchenko wrote:
> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
> index 3431fe210624..eaf63a2c7ae6 100644
> --- a/drivers/xen/Kconfig
> +++ b/drivers/xen/Kconfig
> @@ -152,6 +152,16 @@ config XEN_GNTDEV
>   	help
>   	  Allows userspace processes to use grants.
>   
> +config XEN_GNTDEV_DMABUF
> +	bool "Add support for dma-buf grant access device driver extension"
> +	depends on XEN_GNTDEV && XEN_GRANT_DMA_ALLOC
This must be "depends on XEN_GNTDEV && XEN_GRANT_DMA_ALLOC && 
*DMA_SHARED_BUFFER*"
> +	help
> +	  Allows userspace processes and kernel modules to use Xen backed
> +	  dma-buf implementation. With this extension grant references to
> +	  the pages of an imported dma-buf can be exported for other domain
> +	  use and grant references coming from a foreign domain can be
> +	  converted into a local dma-buf for local export.
> +
>