Introduce VIRTIO_DEVICE_F_MASK bitmask used for identification of per-device features. Feature bits VIRTIO_TRANSPORT_F_START through VIRTIO_TRANSPORT_F_END are reserved for transport features hence are not counted as per-device features against the 64bit feature space.
Signed-off-by: Si-Wei Liu <[email protected]> --- include/uapi/linux/virtio_config.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h index 3c05162..3bdc7ed 100644 --- a/include/uapi/linux/virtio_config.h +++ b/include/uapi/linux/virtio_config.h @@ -54,6 +54,14 @@ #define VIRTIO_TRANSPORT_F_START 28 #define VIRTIO_TRANSPORT_F_END 41 +/* + * Bitmask for all per-device features: feature bits VIRTIO_TRANSPORT_F_START + * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffffc000fffffff for + * all 64bit features + */ +#define VIRTIO_DEVICE_F_MASK (~0ULL << (VIRTIO_TRANSPORT_F_END + 1) | \ + ((1ULL << VIRTIO_TRANSPORT_F_START) - 1)) + #ifndef VIRTIO_CONFIG_NO_LEGACY /* Do we get callbacks when the ring is completely used, even if we've * suppressed them? */ -- 1.8.3.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
