From ef546f1275f6563e8934dd5e338d29d9f9909ca6 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Thu, 11 Dec 2014 14:25:06 +0100 Subject: virtio: add feature checking helpers Add a helper function for checking whether a bit is set in the guest features for a vdev as well as one that works on a feature bit set. Convert code that open-coded this: It cleans up the code and makes it easier to extend the guest feature bits. Signed-off-by: Cornelia Huck Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/virtio/virtio.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include/hw/virtio/virtio.h') diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 85e72d6fd9..d95f8b6d50 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -231,6 +231,17 @@ static inline void virtio_clear_feature(uint32_t *features, unsigned int fbit) *features &= ~(1 << fbit); } +static inline bool __virtio_has_feature(uint32_t features, unsigned int fbit) +{ + assert(fbit < 32); + return !!(features & (1 << fbit)); +} + +static inline bool virtio_has_feature(VirtIODevice *vdev, unsigned int fbit) +{ + return __virtio_has_feature(vdev->guest_features, fbit); +} + static inline bool virtio_is_big_endian(VirtIODevice *vdev) { assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); -- cgit 1.4.1