x86/speculation: Fix missing enumeration value warnings

We support an idle mode for both MDS and TAA mitigations, which has
caused our code to diverge a bit from upstream. In doing so, we forgot
some values in switch statements which also had no default case. This
results in the compiler throwing warnings about enumeration values
not being handled. Add in the missing switch cases.

Orabug: 30833548

Signed-off-by: Patrick Colp <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Author: pjcolp

arch/x86/kernel/cpu/bugs.c

@@ -619,6 +619,7 @@ static void taa_select_mitigation(void)
 		if ( !(ia32_cap & ARCH_CAP_MDS_NO)) {
 			switch (mds_mitigation) {
 			case MDS_MITIGATION_FULL:
+			case MDS_MITIGATION_VMWERV:
 				taa_mitigation = TAA_MITIGATION_VERW;
 				break;
 			case MDS_MITIGATION_IDLE:
@@ -1581,6 +1582,7 @@ void arch_smt_update(void)
 	}
 
 	switch (taa_mitigation) {
+	case TAA_MITIGATION_IDLE:
 	case TAA_MITIGATION_VERW:
 	case TAA_MITIGATION_UCODE_NEEDED:
 		if (sched_smt_active())