linux-kernel - [PATCH v2 1/7] vhost: Add a new modparam to allow userspace select vhost

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Message-ID: <20241004015937.2286459-2-lulu@redhat.com>
Date: Fri,  4 Oct 2024 09:58:15 +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 1/7] vhost: Add a new modparam to allow userspace select vhost_task

The vhost is now using vhost_task and working as a child of the owner thread.
While this makes sense from containerization POV, some old userspace is
confused, as previously vhost not and so was allowed to steal cpu resources
from outside the container. So we add the kthread API support back

Add a new module parameter to allow userspace to select behaviour
between using kthread and task

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vhost/vhost.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 9ac25d08f473..a4a0bc34f59b 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -41,6 +41,10 @@ static int max_iotlb_entries = 2048;
 module_param(max_iotlb_entries, int, 0444);
 MODULE_PARM_DESC(max_iotlb_entries,
 	"Maximum number of iotlb entries. (default: 2048)");
+bool enforce_inherit_owner = true;
+module_param(enforce_inherit_owner, bool, 0444);
+MODULE_PARM_DESC(enforce_inherit_owner,
+		 "enforce vhost use vhost_task(default: Y)");
 
 enum {
 	VHOST_MEMORY_F_LOG = 0x1,
-- 
2.45.0