[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v12 1/9] iommu: introduce the concept of DFN...

Hi Paul,

On 09/27/2018 03:33 PM, Paul Durrant wrote:
...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>

For the ARM bits:

Acked-by: Julien Grall <julien.grall@xxxxxxx>


Julien Grall

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.