arm64: Rename ARM64_SSBD to ARM64_SPECTRE_V4

In a similar manner to the renaming of ARM64_HARDEN_BRANCH_PREDICTOR
to ARM64_SPECTRE_V2, rename ARM64_SSBD to ARM64_SPECTRE_V4. This isn't
_entirely_ accurate, as we also need to take into account the interaction
with SSBS, but that will be taken care of in subsequent patches.
Signed-off-by: Will Deacon <will@kernel.org>

arch/arm64/include/asm/cpucaps.h

@@ -37,7 +37,7 @@
 #define ARM64_HAS_CACHE_IDC			27
 #define ARM64_HAS_CACHE_DIC			28
 #define ARM64_HW_DBM				29
-#define ARM64_SSBD				30
+#define ARM64_SPECTRE_V4			30
 #define ARM64_MISMATCHED_CACHE_TYPE		31
 #define ARM64_HAS_STAGE2_FWB			32
 #define ARM64_HAS_CRC32				33

arch/arm64/kernel/cpu_errata.c

@@ -675,7 +675,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 #endif
 	{
 		.desc = "Speculative Store Bypass Disable",
-		.capability = ARM64_SSBD,
+		.capability = ARM64_SPECTRE_V4,
 		.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
 		.matches = has_ssbd_mitigation,
 		.cpu_enable = cpu_enable_ssbd_mitigation,

arch/arm64/kvm/hyp/include/hyp/switch.h

@@ -481,7 +481,7 @@ static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
 
 static inline bool __needs_ssbd_off(struct kvm_vcpu *vcpu)
 {
-	if (!cpus_have_final_cap(ARM64_SSBD))
+	if (!cpus_have_final_cap(ARM64_SPECTRE_V4))
 		return false;
 
 	return !(vcpu->arch.workaround_flags & VCPU_WORKAROUND_2_FLAG);