linux-kernel - [RFC 7/7] vhost: Add new UAPI to support changing Kthread mode

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Message-ID: <20240819092851.441670-8-lulu@redhat.com>
Date: Mon, 19 Aug 2024 17:27:33 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
	jasowang@...hat.com,
	mst@...hat.com,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: [RFC 7/7] vhost: Add new UAPI to support changing Kthread mode

Add a new UAPI to support setting the vhost device to
use kthread mode. The user space application needs to use
VHOST_SET_USE_KTHREAD to set the mode. This setting must
be set before VHOST_SET_OWNER is set.

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vhost/vhost.c      | 11 ++++++++++-
 include/uapi/linux/vhost.h |  2 ++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 0a7b2999100f..d6b71bddc272 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2340,14 +2340,23 @@ long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)
 {
 	struct eventfd_ctx *ctx;
 	u64 p;
-	long r;
+	long r = 0;
 	int i, fd;
+	bool kthread;
 
 	/* If you are not the owner, you can become one */
 	if (ioctl == VHOST_SET_OWNER) {
 		r = vhost_dev_set_owner(d);
 		goto done;
 	}
+	if (ioctl == VHOST_SET_USE_KTHREAD) {
+		if (copy_from_user(&kthread, argp, sizeof(kthread))) {
+			r = -EFAULT;
+			goto done;
+		}
+		use_kthread = kthread;
+		goto done;
+	}
 
 	/* You must be the owner to do anything else */
 	r = vhost_dev_check_owner(d);
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index b95dd84eef2d..386fe735da63 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -235,4 +235,6 @@
  */
 #define VHOST_VDPA_GET_VRING_SIZE	_IOWR(VHOST_VIRTIO, 0x82,	\
 					      struct vhost_vring_state)
+
+#define VHOST_SET_USE_KTHREAD _IOW(VHOST_VIRTIO, 0x83, bool)
 #endif
-- 
2.45.0