The following commit has been merged into the x86/core branch of tip:
Commit-ID: 5c9a92dec3235b0c1d51e92860f8014753161593
Gitweb: https://git.kernel.org/tip/5c9a92dec3235b0c1d51e92860f8014753161593
Author: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
AuthorDate: Mon, 17 Oct 2022 16:41:20 +02:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 17 Oct 2022 16:41:20 +02:00
x86/bugs: Add retbleed=force
Debug aid, allows running retbleed=force,stuff on non-affected uarchs
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/bugs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index e6c23ea..b307b83 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -838,6 +838,8 @@ static int __init retbleed_parse_cmdline(char *str)
retbleed_cmd = RETBLEED_CMD_STUFF;
} else if (!strcmp(str, "nosmt")) {
retbleed_nosmt = true;
+ } else if (!strcmp(str, "force")) {
+ setup_force_cpu_bug(X86_BUG_RETBLEED);
} else {
pr_err("Ignoring unknown retbleed option (%s).", str);
}
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