diff options
Diffstat (limited to 'hw/virtio.c')
| -rw-r--r-- | hw/virtio.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/hw/virtio.c b/hw/virtio.c index 8a72d8d21..93a7de689 100644 --- a/hw/virtio.c +++ b/hw/virtio.c @@ -451,6 +451,13 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) switch (addr) { case VIRTIO_PCI_GUEST_FEATURES: + /* Guest does not negotiate properly? We have to assume nothing. */ + if (val & (1 << VIRTIO_F_BAD_FEATURE)) { + if (vdev->bad_features) + val = vdev->bad_features(vdev); + else + val = 0; + } if (vdev->set_features) vdev->set_features(vdev, val); vdev->features = val; @@ -490,7 +497,7 @@ static uint32_t virtio_ioport_read(void *opaque, uint32_t addr) switch (addr) { case VIRTIO_PCI_HOST_FEATURES: ret = vdev->get_features(vdev); - ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY); + ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY) | (1 << VIRTIO_F_BAD_FEATURE); break; case VIRTIO_PCI_GUEST_FEATURES: ret = vdev->features; |