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Subject[PATCH v3 2/2] misc: pvpanic: introduce module parameter 'events'
Date
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
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