linux-kernel - [PATCH v1] iommu/s390: Declare s390 iommu reserved regions

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Message-Id: <1547573850-9459-1-git-send-email-pmorel@linux.ibm.com>
Date:   Tue, 15 Jan 2019 18:37:29 +0100
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     gerald.schaefer@...ibm.com
Cc:     joro@...tes.org, linux-s390@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, shameerali.kolothum.thodi@...wei.com,
        walling@...ux.ibm.com
Subject: [PATCH v1] iommu/s390: Declare s390 iommu reserved regions

The s390 iommu can only allow DMA transactions between the zPCI device
entries start_dma and end_dma.

Let's declare the regions before start_dma and after end_dma as
reserved regions using the appropriate callback in iommu_ops.

The reserved region may later be retrieved from sysfs or from
the vfio iommu internal interface.

This seems to me related with the work Shameer has started on
vfio_iommu_type1 so I add Alex and Shameer to the CC list.

Pierre Morel (1):
  iommu/s390: Declare s390 iommu reserved regions

 drivers/iommu/s390-iommu.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

-- 
2.7.4