diff options
| author |   Michael S. Tsirkin <mst@redhat.com> | 2014-11-27 13:45:58 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:05:24 +0200 |
| commit | 93d389f82078cf7197152fb10d21977da0883420 (patch) | |
| tree | c168e5be2acd4e257212006a710af14df2185d80 /drivers/virtio | |
| parent | virtio: add support for 64 bit features. (diff) | |
| download | linux-dev-93d389f82078cf7197152fb10d21977da0883420.tar.xz linux-dev-93d389f82078cf7197152fb10d21977da0883420.zip | |
virtio: assert 32 bit features in transports
At this point, no transports set any of the high 32 feature bits.
Since transports generally can't (yet) cope with such bits, add BUG_ON
checks to make sure they are not set by mistake.
Based on rproc patch by Rusty.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_mmio.c | 3 | ||||
| -rw-r--r-- | drivers/virtio/virtio_pci.c | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index c63d0efa947b..aec1daee9ada 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -159,6 +159,9 @@ static void vm_finalize_features(struct virtio_device *vdev) /* Give virtio_ring a chance to accept features. */ vring_transport_features(vdev); + /* Make sure we don't have any features > 32 bits! */ + BUG_ON((u32)vdev->features != vdev->features); + writel(0, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL); writel(vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES); } diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c index 7e0efa7fc384..dd6df979862b 100644 --- a/drivers/virtio/virtio_pci.c +++ b/drivers/virtio/virtio_pci.c @@ -119,6 +119,9 @@ static void vp_finalize_features(struct virtio_device *vdev) /* Give virtio_ring a chance to accept features. */ vring_transport_features(vdev); + /* Make sure we don't have any features > 32 bits! */ + BUG_ON((u32)vdev->features != vdev->features); + /* We only support 32 feature bits. */ iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES); } |