diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2009-12-08 20:07:48 +0200 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2009-12-12 07:59:38 -0600 |
| commit | 6d74ca5aa83b83fb52332f7735c61ecb7a5328c1 (patch) | |
| tree | 6ea05e57ca0165275eda7e6d57cecd5fd52757b6 /hw/syborg_virtio.c | |
| parent | b3c3f123f785fb861d930080f083507b51f5ce79 (diff) | |
virtio: verify features on load
migrating between hosts which have different features
might break silently, if the migration destination
does not support some features supported by source.
Prevent this from happening by comparing acked feature
bits with the mask supported by the device.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/syborg_virtio.c')
| -rw-r--r-- | hw/syborg_virtio.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/hw/syborg_virtio.c b/hw/syborg_virtio.c index 6cf5a15c2c..a84206a11c 100644 --- a/hw/syborg_virtio.c +++ b/hw/syborg_virtio.c @@ -87,7 +87,7 @@ static uint32_t syborg_virtio_readl(void *opaque, target_phys_addr_t offset) break; case SYBORG_VIRTIO_HOST_FEATURES: ret = vdev->get_features(vdev); - ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY); + ret |= vdev->binding->get_features(s); break; case SYBORG_VIRTIO_GUEST_FEATURES: ret = vdev->features; @@ -242,8 +242,16 @@ static void syborg_virtio_update_irq(void *opaque, uint16_t vector) qemu_set_irq(proxy->irq, level != 0); } +static unsigned syborg_virtio_get_features(void *opaque) +{ + unsigned ret = 0; + ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY); + return ret; +} + static VirtIOBindings syborg_virtio_bindings = { - .notify = syborg_virtio_update_irq + .notify = syborg_virtio_update_irq, + .get_features = syborg_virtio_get_features, }; static int syborg_virtio_init(SyborgVirtIOProxy *proxy, VirtIODevice *vdev) |