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vm-virtio, vhost_user_{fs,block,backend}: Move EVENT_IDX handling

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Move the method that is used to decide whether the guest should be
signalled into the Queue implementation from vm-virtio. This removes
duplicated code between vhost_user_backend and the vm-virtio block
implementation.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2020-05-20 10:40:54 +01:00
committed by Sebastien Boeuf
parent 8ae7a38da5
commit a813b57f59
5 changed files with 44 additions and 57 deletions
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5
src/bin/vhost_user_fs.rs
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@@ -163,8 +163,9 @@ impl<F: FileSystem + Send + Sync + 'static> VhostUserFsThread<F> {
let mut vring = vring_lock.write().unwrap();
if event_idx {
if let Some(used_idx) = vring.mut_queue().add_used(&mem, head_index, 0) {
if vring.needs_notification(&mem, Wrapping(used_idx)) {
let queue = vring.mut_queue();
if let Some(used_idx) = queue.add_used(&mem, head_index, 0) {
if queue.needs_notification(&mem, Wrapping(used_idx)) {
vring.signal_used_queue().unwrap();
}
}