Re: [Xen-devel] [PATCH v9 1/7] iommu: introduce the concept of DFN...

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Paul Durrant [mailto:paul.durrant@xxxxxxxxxx]
> Sent: Thursday, September 13, 2018 11:21 PM
> 
> ...meaning 'device DMA frame number' i.e. a frame number mapped in the
> IOMMU
> (rather than the MMU) and hence used for DMA address translation.
> 
> This patch is a largely cosmetic change that substitutes the terms 'gfn'
> and 'gaddr' for 'dfn' and 'daddr' in all the places where the frame number
> or address relate to a device rather than the CPU.
> 
> The parts that are not purely cosmetic are:
> 
>  - the introduction of a type-safe declaration of dfn_t and definition of
>    INVALID_DFN to make the substitution of gfn_x(INVALID_GFN)
> mechanical.
>  - the introduction of __dfn_to_daddr and __daddr_to_dfn (and type-safe
>    variants without the leading __) with some use of the former.
> 
> Subsequent patches will convert code to make use of type-safe DFNs.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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