linux-kernel - [PATCH v3 0/1] s390: virtio: let arch choose to accept devices without IOMMU feature

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Date:   Wed, 17 Jun 2020 12:43:56 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     pasic@...ux.ibm.com, borntraeger@...ibm.com, frankja@...ux.ibm.com,
        mst@...hat.com, jasowang@...hat.com, cohuck@...hat.com,
        kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, thomas.lendacky@....com,
        david@...son.dropbear.id.au, linuxram@...ibm.com,
        heiko.carstens@...ibm.com, gor@...ux.ibm.com
Subject: [PATCH v3 0/1] s390: virtio: let arch choose to accept devices without IOMMU feature

An architecture protecting the guest memory against unauthorized host
access may want to enforce VIRTIO I/O device protection through the
use of VIRTIO_F_IOMMU_PLATFORM.

Let's give a chance to the architecture to accept or not devices
without VIRTIO_F_IOMMU_PLATFORM.

Pierre Morel (1):
  s390: virtio: let arch accept devices without IOMMU feature

 arch/s390/mm/init.c     |  6 ++++++
 drivers/virtio/virtio.c | 22 ++++++++++++++++++++++
 include/linux/virtio.h  |  2 ++
 3 files changed, 30 insertions(+)

-- 
2.25.1

Changelog

to v3:

- add warning
  (Connie, Christian)

- add comment
  (Connie)

- change hook name
  (Halil, Connie)

to v2:

- put the test in virtio_finalize_features()
  (Connie)

- put the test inside VIRTIO core
  (Jason)

- pass a virtio device as parameter
  (Halil)