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From:   Pierre Morel <pmorel@linux.ibm.com>
To:     linux-kernel@vger.kernel.org
Cc:     pasic@linux.ibm.com, borntraeger@de.ibm.com, frankja@linux.ibm.com,
        mst@redhat.com, jasowang@redhat.com, cohuck@redhat.com,
        kvm@vger.kernel.org, linux-s390@vger.kernel.org,
        virtualization@lists.linux-foundation.org, thomas.lendacky@amd.com,
        david@gibson.dropbear.id.au, linuxram@us.ibm.com,
        hca@linux.ibm.com, gor@linux.ibm.com
Subject: [PATCH v8 0/2] s390: virtio: let arch validate VIRTIO features
Date:   Tue, 18 Aug 2020 16:58:29 +0200
Message-Id: <1597762711-3550-1-git-send-email-pmorel@linux.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi all,

The goal of the series is to give a chance to the architecture
to validate VIRTIO device features.

in this respin:

I use the original idea from Connie for an optional
arch_has_restricted_memory_access.

I renamed the callback accordingly, added the definition of
ARCH_HAS_RESTRICTED_MEMORY_ACCESS inside the VIRTIO Kconfig
and the selection in the PROTECTED_VIRTUALIZATION_GUEST
config entry.


Regards,
Pierre

Pierre Morel (2):
  virtio: let arch validate VIRTIO features
  s390: virtio: PV needs VIRTIO I/O device protection

 arch/s390/Kconfig             |  1 +
 arch/s390/mm/init.c           | 30 ++++++++++++++++++++++++++++++
 drivers/virtio/Kconfig        |  6 ++++++
 drivers/virtio/virtio.c       |  4 ++++
 include/linux/virtio_config.h |  9 +++++++++
 5 files changed, 50 insertions(+)

-- 
2.25.1

Changelog

to v8:

- refactoring by using an optional callback
  (Connie)

to v7:

- typo in warning message
  (Connie)
to v6:

- rewording warning messages
  (Connie, Halil)

to v5:

- return directly from S390 arch_validate_virtio_features()
  when the guest is not protected.
  (Connie)

- Somme rewording
  (Connie, Michael)

- moved back code from arch/s390/ ...kernel/uv.c to ...mm/init.c
  (Christian)

to v4:

- separate virtio and arch code
  (Pierre)

- moved code from arch/s390/mm/init.c to arch/s390/kernel/uv.c
  (as interpreted from Heiko's comment)

- moved validation inside the arch code
  (Connie)

- moved the call to arch validation before VIRTIO_F_1 test
  (Michael)

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)