Re: [PATCH v5 2/8] s390/cio: introduce DMA pools to cio

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On Wed, 12 Jun 2019 13:12:30 +0200
Halil Pasic <pasic@xxxxxxxxxxxxx> wrote:

> To support protected virtualization cio will need to make sure the
> memory used for communication with the hypervisor is DMA memory.
> 
> Let us introduce one global pool for cio.
> 
> Our DMA pools are implemented as a gen_pool backed with DMA pages. The
> idea is to avoid each allocation effectively wasting a page, as we
> typically allocate much less than PAGE_SIZE.
> 
> Signed-off-by: Halil Pasic <pasic@xxxxxxxxxxxxx>
> Reviewed-by: Sebastian Ott <sebott@xxxxxxxxxxxxx>
> Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
> ---
>  arch/s390/Kconfig           |   1 +
>  arch/s390/include/asm/cio.h |  11 +++
>  drivers/s390/cio/css.c      | 133 ++++++++++++++++++++++++++++++++++--
>  3 files changed, 141 insertions(+), 4 deletions(-)

Changes look good to me.
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