* [PATCH] powerpc: add link stack flush mitigation status in debugfs.
@ 2019-11-27 22:09 Michal Suchanek
2022-02-15 5:26 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Michal Suchanek @ 2019-11-27 22:09 UTC (permalink / raw)
To: linuxppc-dev
Cc: Geert Uytterhoeven, Anthony Steinhauser, Gustavo L. F. Walbon,
Christopher M. Riedl, YueHaibing, linux-kernel, Diana Craciun,
Paul Mackerras, Josh Poimboeuf, Michal Suchanek
The link stack flush status is not visible in debugfs. It can be enabled
even when count cache flush is disabled. Add separate file for its
status.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/security.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 7d4b2080a658..56dce4798a4d 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -446,14 +446,26 @@ static int count_cache_flush_get(void *data, u64 *val)
return 0;
}
+static int link_stack_flush_get(void *data, u64 *val)
+{
+ *val = link_stack_flush_enabled;
+
+ return 0;
+}
+
DEFINE_DEBUGFS_ATTRIBUTE(fops_count_cache_flush, count_cache_flush_get,
count_cache_flush_set, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_link_stack_flush, link_stack_flush_get,
+ count_cache_flush_set, "%llu\n");
static __init int count_cache_flush_debugfs_init(void)
{
debugfs_create_file_unsafe("count_cache_flush", 0600,
powerpc_debugfs_root, NULL,
&fops_count_cache_flush);
+ debugfs_create_file_unsafe("link_stack_flush", 0600,
+ powerpc_debugfs_root, NULL,
+ &fops_link_stack_flush);
return 0;
}
device_initcall(count_cache_flush_debugfs_init);
--
2.23.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] powerpc: add link stack flush mitigation status in debugfs.
2019-11-27 22:09 [PATCH] powerpc: add link stack flush mitigation status in debugfs Michal Suchanek
@ 2022-02-15 5:26 ` Michael Ellerman
0 siblings, 0 replies; 2+ messages in thread
From: Michael Ellerman @ 2022-02-15 5:26 UTC (permalink / raw)
To: Michal Suchanek, linuxppc-dev
Cc: Geert Uytterhoeven, Anthony Steinhauser, Gustavo L. F. Walbon,
Christopher M. Riedl, YueHaibing, linux-kernel, Diana Craciun,
Josh Poimboeuf, Paul Mackerras
On Wed, 27 Nov 2019 23:09:59 +0100, Michal Suchanek wrote:
> The link stack flush status is not visible in debugfs. It can be enabled
> even when count cache flush is disabled. Add separate file for its
> status.
>
>
Applied to powerpc/next.
[1/1] powerpc: add link stack flush mitigation status in debugfs.
https://git.kernel.org/powerpc/c/b2a6f6043577e09d51a4b5577fff9fc9f5b14b1c
cheers
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