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virtio: add feature checking helpers

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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 <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2014-12-11 14:25:06 +01:00 • committed by Michael S. Tsirkin
parent 0cd09c3a6c
commit ef546f1275
8 changed files with 42 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

11
include/hw/virtio/virtio.h
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@ -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);