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[Qemu-devel] question on virtio ccw
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] question on virtio ccw |
Date: |
Thu, 7 Dec 2017 19:18:44 +0200 |
I see this in ccw in qemu:
if (virtio_set_status(vdev, status) == 0) {
if (vdev->status == 0) {
virtio_ccw_reset_virtio(dev, vdev);
}
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
virtio_ccw_start_ioeventfd(dev);
}
sch->curr_status.scsw.count = ccw.count - sizeof(status);
ret = 0;
} else {
/* Trigger a command reject. */
ret = -ENOSYS;
}
virtio_set_status on success sets vdev->status to status.
Why check vdev->status in one place and status in another?
--
MST
- [Qemu-devel] question on virtio ccw,
Michael S. Tsirkin <=