linux-kernel - [PATCH v2 4/7] vhost: Add the vhost

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Message-ID: <20241004015937.2286459-5-lulu@redhat.com>
Date: Fri,  4 Oct 2024 09:58:18 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
	jasowang@...hat.com,
	mst@...hat.com,
	michael.christie@...cle.com,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH v2 4/7] vhost: Add the vhost_worker to support kthread

Add back the previously removed vhost_worker function to support the kthread
and rename it vhost_run_work_kthread_list.

The old function vhost_worker was change to support task in
commit 6e890c5d5021 ("vhost: use vhost_tasks for worker threads")
change to xarray in
commit 1cdaafa1b8b4 ("vhost: replace single worker pointer with xarray")

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vhost/vhost.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index fed6671c1ffb..349499139f4f 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -418,6 +418,44 @@ static void vhost_vq_reset(struct vhost_dev *dev,
 	__vhost_vq_meta_reset(vq);
 }
 
+static int vhost_run_work_kthread_list(void *data)
+{
+	struct vhost_worker *worker = data;
+	struct vhost_work *work, *work_next;
+	struct vhost_dev *dev = worker->dev;
+	struct llist_node *node;
+
+	kthread_use_mm(dev->mm);
+
+	for (;;) {
+		/* mb paired w/ kthread_stop */
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		if (kthread_should_stop()) {
+			__set_current_state(TASK_RUNNING);
+			break;
+		}
+		node = llist_del_all(&worker->work_list);
+		if (!node)
+			schedule();
+
+		node = llist_reverse_order(node);
+		/* make sure flag is seen after deletion */
+		smp_wmb();
+		llist_for_each_entry_safe(work, work_next, node, node) {
+			clear_bit(VHOST_WORK_QUEUED, &work->flags);
+			__set_current_state(TASK_RUNNING);
+			kcov_remote_start_common(worker->kcov_handle);
+			work->fn(work);
+			kcov_remote_stop();
+			cond_resched();
+		}
+	}
+	kthread_unuse_mm(dev->mm);
+
+	return 0;
+}
+
 static bool vhost_run_work_list(void *data)
 {
 	struct vhost_worker *worker = data;
-- 
2.45.0