Commit 7e44909e authored by Pawan Gupta's avatar Pawan Gupta Committed by Borislav Petkov (AMD)
Browse files

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



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: default avatarPawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarNikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/20250611-eibrs-fix-v4-4-5ff86cac6c61@linux.intel.com
parent 9f85fdb9

arch/x86/kernel/cpu/bugs.c

+13 −7
Original line number Diff line number Diff line
@@ -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);



		setup_force_cpu_cap(X86_FEATURE_RETHUNK);

		set_return_thunk(its_return_thunk);

		break;

	}

}



#undef pr_fmt