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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
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2
hw/char/virtio-serial-bus.c
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@ -76,7 +76,7 @@ static VirtIOSerialPort *find_port_by_name(char *name)
static bool use_multiport(VirtIOSerial *vser)
{
VirtIODevice *vdev = VIRTIO_DEVICE(vser);
return vdev->guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
return virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT);
}
static size_t write_to_port(VirtIOSerialPort *port,