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x86/bugs: Use switch/case in its_apply_mitigation()

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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>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/20250611-eibrs-fix-v4-4-5ff86cac6c61@linux.intel.com
This commit is contained in:
Pawan Gupta
2025-06-11 10:29:47 -07:00
committed by Borislav Petkov (AMD)
parent 9f85fdb9fc
commit 7e44909e0e
1 changed files with 13 additions and 7 deletions
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arch/x86/kernel/cpu/bugs.c
+13 -7
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@@ -1468,15 +1468,21 @@ 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;
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);
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