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    Subject[PATCH 4/6] virtio: VIRTIO_DEVICE_F_MASK for all per-device features
    Date
    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 <si-wei.liu@oracle.com>
    ---
    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
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