Prepare to apply stuffing mitigation in its_apply_mitigation(). This is
currently only done via retbleed mitigation. Also using switch/case makes
it evident that mitigation mode like VMEXIT_ONLY doesn't need any special
handling.
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
---
arch/x86/kernel/cpu/bugs.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index a088302b320cf68344e28be7710b5a3582bba9ea..fbfc08f5f9f652beb677a1b5310e4322600082ac 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1471,15 +1471,21 @@ static void __init its_update_mitigation(void)
static void __init its_apply_mitigation(void)
{
+ switch (its_mitigation) {
+ case ITS_MITIGATION_OFF:
+ case ITS_MITIGATION_AUTO:
+ case ITS_MITIGATION_VMEXIT_ONLY:
/* its=stuff forces retbleed stuffing and is enabled there. */
- if (its_mitigation != ITS_MITIGATION_ALIGNED_THUNKS)
- return;
-
- if (!boot_cpu_has(X86_FEATURE_RETPOLINE))
- setup_force_cpu_cap(X86_FEATURE_INDIRECT_THUNK_ITS);
+ case ITS_MITIGATION_RETPOLINE_STUFF:
+ break;
+ case ITS_MITIGATION_ALIGNED_THUNKS:
+ if (!boot_cpu_has(X86_FEATURE_RETPOLINE))
+ setup_force_cpu_cap(X86_FEATURE_INDIRECT_THUNK_ITS);
- setup_force_cpu_cap(X86_FEATURE_RETHUNK);
- set_return_thunk(its_return_thunk);
+ setup_force_cpu_cap(X86_FEATURE_RETHUNK);
+ set_return_thunk(its_return_thunk);
+ break;
+ }
}
#undef pr_fmt
--
2.34.1