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Subject[PATCH RFC 6/8] powerpc/64: barrier_nospec: Add debugfs trigger
Date
Copypasta from rfi implementation

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/setup_64.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index d1d9f047161e..4b67b7b877d9 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -955,6 +955,41 @@ static __init int rfi_flush_debugfs_init(void)
return 0;
}
device_initcall(rfi_flush_debugfs_init);
+
+static int barrier_nospec_set(void *data, u64 val)
+{
+ switch (val) {
+ case 0:
+ case 1:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (!!val == !!barrier_nospec_enabled)
+ return 0;
+
+ barrier_nospec_enable(!!val);
+
+ return 0;
+}
+
+static int barrier_nospec_get(void *data, u64 *val)
+{
+ *val = barrier_nospec_enabled ? 1 : 0;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_barrier_nospec,
+ barrier_nospec_get, barrier_nospec_set, "%llu\n");
+
+static __init int barrier_nospec_debugfs_init(void)
+{
+ debugfs_create_file("barrier_nospec", 0600, powerpc_debugfs_root, NULL,
+ &fops_barrier_nospec);
+ return 0;
+}
+device_initcall(barrier_nospec_debugfs_init);
#endif

ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
--
2.13.6
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