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From: zhenwei pi <pizhenwei@bytedance.com>
To: arnd@arndb.de, gregkh@linuxfoundation.org
Cc: pbonzini@redhat.com, linux-kernel@vger.kernel.org,
	pizhenwei@bytedance.com
Subject: [PATCH v3 2/2] misc: pvpanic: introduce module parameter 'events'
Date: Fri,  8 Jan 2021 21:52:23 +0800	[thread overview]
Message-ID: <20210108135223.2924507-3-pizhenwei@bytedance.com> (raw)
In-Reply-To: <20210108135223.2924507-1-pizhenwei@bytedance.com>

Suggested by Paolo, add a module parameter that can be used to limit
which capabilities the driver uses.

Finally, the pvpanic guest driver works by the limitation of both
device capability and user setting.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
 drivers/misc/pvpanic.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index e1023c7b8fb0..417f1086e764 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -19,6 +19,10 @@
 #include <uapi/misc/pvpanic.h>
 
 static void __iomem *base;
+static unsigned int events = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
+module_param(events, uint, 0644);
+MODULE_PARM_DESC(events, "set event limitation of pvpanic device");
+
 static unsigned int capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
 
 static ssize_t capability_show(struct device *dev,
@@ -48,7 +52,7 @@ MODULE_LICENSE("GPL");
 static void
 pvpanic_send_event(unsigned int event)
 {
-	if (event & capability)
+	if (event & capability & events)
 		iowrite8(event, base);
 }
 
-- 
2.25.1


  parent reply	other threads:[~2021-01-08 13:53 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-08 13:52 [PATCH v3 0/2] misc: pvpanic: introduce capability & module parameter zhenwei pi
2021-01-08 13:52 ` [PATCH v3 1/2] misc: pvpanic: introduce device capability zhenwei pi
2021-01-08 14:06   ` Greg KH
2021-01-08 13:52 ` zhenwei pi [this message]
2021-01-08 14:07   ` [PATCH v3 2/2] misc: pvpanic: introduce module parameter 'events' Greg KH
2021-01-08 15:04     ` Paolo Bonzini
2021-01-08 15:15       ` Greg KH
2021-01-08 15:26         ` Paolo Bonzini
2021-01-09 11:31           ` Greg KH
2021-01-10  3:10             ` [External] " zhenwei pi
2021-01-11 18:27             ` Paolo Bonzini

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