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| author | Michael S. Tsirkin <mst@redhat.com> | 2014-12-01 15:52:40 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:06:32 +0200 |
| commit | 747ae34a6ef681fbd993be214d8c0a30bd4a2fda (patch) | |
| tree | 3905b0413ec10b96e9a62af9d19acc682c8390dc | |
| parent | df1b57fe59bc5b1486fe142e6ee76c493c52c543 (diff) | |
| download | linux-747ae34a6ef681fbd993be214d8c0a30bd4a2fda.tar.gz | |
virtio: make VIRTIO_F_VERSION_1 a transport bit
Activate VIRTIO_F_VERSION_1 automatically unless legacy_only is set. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | drivers/virtio/virtio.c | 6 | ||||
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 2 | ||||
| -rw-r--r-- | include/uapi/linux/virtio_config.h | 4 |
3 files changed, 9 insertions, 3 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index f9ad99c8b352..fa6b75db5f1f 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -197,7 +197,11 @@ static int virtio_dev_probe(struct device *_d) driver_features_legacy = driver_features; } - if (driver_features & device_features & (1ULL << VIRTIO_F_VERSION_1)) + /* Detect legacy-only drivers and disable VIRTIO_F_VERSION_1. */ + if (drv->legacy_only) + device_features &= ~(1ULL << VIRTIO_F_VERSION_1); + + if (device_features & (1ULL << VIRTIO_F_VERSION_1)) dev->features = driver_features & device_features; else dev->features = driver_features_legacy & device_features; diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 55532a43ead3..00ec6b3f96b2 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -780,6 +780,8 @@ void vring_transport_features(struct virtio_device *vdev) break; case VIRTIO_RING_F_EVENT_IDX: break; + case VIRTIO_F_VERSION_1: + break; default: /* We don't understand this bit. */ __virtio_clear_bit(vdev, i); diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h index 4d05671fbaec..a6d0cdeaacd4 100644 --- a/include/uapi/linux/virtio_config.h +++ b/include/uapi/linux/virtio_config.h @@ -43,11 +43,11 @@ /* We've given up on this device. */ #define VIRTIO_CONFIG_S_FAILED 0x80 -/* Some virtio feature bits (currently bits 28 through 31) are reserved for the +/* Some virtio feature bits (currently bits 28 through 32) are reserved for the * transport being used (eg. virtio_ring), the rest are per-device feature * bits. */ #define VIRTIO_TRANSPORT_F_START 28 -#define VIRTIO_TRANSPORT_F_END 32 +#define VIRTIO_TRANSPORT_F_END 33 /* Do we get callbacks when the ring is completely used, even if we've * suppressed them? */ |