linux-kernel - [PATCH 0/6] vhost: Reset batched descriptors on SET_VRING

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Date:   Sun, 29 Mar 2020 13:33:53 +0200
From:   Eugenio Pérez <eperezma@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/6] vhost: Reset batched descriptors on SET_VRING_BASE call

Vhost did not reset properly the batched descriptors on SET_VRING_BASE event. Because of that, is possible to return an invalid descriptor to the guest.

This series ammend this, and creates a test to assert correct behavior. To do that, they need to expose a new function in virtio_ring, virtqueue_reset_free_head. Not sure if this can be avoided.

Also, change from https://lkml.org/lkml/2020/3/27/108 is not included, that avoids to update a variable in a loop where it can be updated once.

This is meant to be applied on top of eccb852f1fe6bede630e2e4f1a121a81e34354ab in git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git, and some commits should be squashed with that series.

Eugenio Pérez (6):
  tools/virtio: Add --batch option
  tools/virtio: Add --batch=random option
  tools/virtio: Add --reset=random
  tools/virtio: Make --reset reset ring idx
  vhost: Delete virtqueue batch_descs member
  fixup! vhost: batching fetches

 drivers/vhost/test.c         |  57 ++++++++++++++++
 drivers/vhost/test.h         |   1 +
 drivers/vhost/vhost.c        |  12 +++-
 drivers/vhost/vhost.h        |   1 -
 drivers/virtio/virtio_ring.c |  18 +++++
 include/linux/virtio.h       |   2 +
 tools/virtio/linux/virtio.h  |   2 +
 tools/virtio/virtio_test.c   | 123 +++++++++++++++++++++++++++++++----
 8 files changed, 201 insertions(+), 15 deletions(-)

-- 
2.18.1