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virtio-devices: vhost_user: skip resume for disconnected backends

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resume() mirrors pause() for backend communication: it skips the
vhost-user backend call when the device is already disconnected, and it
marks newly failed resume_vhost_user() calls disconnected only when the
classifier identifies transport loss.

Signed-off-by: Dylan Reid <dgreid@fb.com>
This commit is contained in:
Dylan Reid
2026-05-08 17:29:08 -07:00
committed by Bo Chen
parent f56bfdaeb7
commit 99ec20ff97
2 changed files with 40 additions and 7 deletions
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8
vmm/src/device_manager.rs
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@@ -5553,7 +5553,13 @@ impl Pausable for DeviceManager {
fn resume(&mut self) -> result::Result<(), MigratableError> {
for (_, device_node) in self.device_tree.lock().unwrap().iter() {
if let Some(migratable) = &device_node.migratable {
migratable.lock().unwrap().resume()?;
match migratable.lock().unwrap().resume() {
Ok(()) => {}
Err(MigratableError::DeviceDisconnected(id)) => {
warn!("Skipping resume for disconnected device {id}");
}
Err(e) => return Err(e),
}
}
}
Ok(())