netdev - [PATCH RFC 3/3] vhost, kcov: collect coverage from vhost

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Date:   Thu, 17 Oct 2019 19:44:15 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     linux-usb@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        David Windsor <dwindsor@...il.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Anders Roxell <anders.roxell@...aro.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH RFC 3/3] vhost, kcov: collect coverage from vhost_worker

This patch adds kcov_remote_start/kcov_remote_stop annotations to the
vhost_worker function, which is responsible for processing vhost works.
Since vhost_worker is spawned when a vhost device instance is created,
the common kcov handle is used for kcov_remote_start/stop annotations.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 drivers/vhost/vhost.c | 15 +++++++++++++++
 drivers/vhost/vhost.h |  3 +++
 2 files changed, 18 insertions(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 36ca2cf419bf..71a349f6b352 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -357,7 +357,13 @@ static int vhost_worker(void *data)
 		llist_for_each_entry_safe(work, work_next, node, node) {
 			clear_bit(VHOST_WORK_QUEUED, &work->flags);
 			__set_current_state(TASK_RUNNING);
+#ifdef CONFIG_KCOV
+			kcov_remote_start(dev->kcov_handle);
+#endif
 			work->fn(work);
+#ifdef CONFIG_KCOV
+			kcov_remote_stop();
+#endif
 			if (need_resched())
 				schedule();
 		}
@@ -546,6 +552,9 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
 
 	/* No owner, become one */
 	dev->mm = get_task_mm(current);
+#ifdef CONFIG_KCOV
+	dev->kcov_handle = current->kcov_handle;
+#endif
 	worker = kthread_create(vhost_worker, dev, "vhost-%d", current->pid);
 	if (IS_ERR(worker)) {
 		err = PTR_ERR(worker);
@@ -571,6 +580,9 @@ long vhost_dev_set_owner(struct vhost_dev *dev)
 	if (dev->mm)
 		mmput(dev->mm);
 	dev->mm = NULL;
+#ifdef CONFIG_KCOV
+	dev->kcov_handle = 0;
+#endif
 err_mm:
 	return err;
 }
@@ -682,6 +694,9 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
 	if (dev->worker) {
 		kthread_stop(dev->worker);
 		dev->worker = NULL;
+#ifdef CONFIG_KCOV
+		dev->kcov_handle = 0;
+#endif
 	}
 	if (dev->mm)
 		mmput(dev->mm);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index e9ed2722b633..010ca1ebcbd5 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -173,6 +173,9 @@ struct vhost_dev {
 	int iov_limit;
 	int weight;
 	int byte_weight;
+#ifdef CONFIG_KCOV
+	u64 kcov_handle;
+#endif
 };
 
 bool vhost_exceeds_weight(struct vhost_virtqueue *vq, int pkts, int total_len);
-- 
2.23.0.866.gb869b98d4c-goog