KVM: arm64: Remove kvm_arch_vm_ioctl_check_extension()

kvm_arch_vm_ioctl_check_extension() is only called from
kvm_vm_ioctl_check_extension(), so we can inline it and remove the extra
function.
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201118194402.2892-3-will@kernel.org

arch/arm64/include/asm/cpufeature.h

@@ -697,6 +697,11 @@ static inline bool system_supports_generic_auth(void)
 		cpus_have_const_cap(ARM64_HAS_GENERIC_AUTH);
 }
 
+static inline bool system_has_full_ptr_auth(void)
+{
+	return system_supports_address_auth() && system_supports_generic_auth();
+}
+
 static __always_inline bool system_uses_irq_prio_masking(void)
 {
 	return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) &&

arch/arm64/include/asm/kvm_host.h

@@ -58,7 +58,6 @@ int kvm_arm_init_sve(void);
 int __attribute_const__ kvm_target_cpu(void);
 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
 void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
-int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
 void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
 
 struct kvm_vmid {

arch/arm64/kvm/arm.c

@@ -182,6 +182,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
 	case KVM_CAP_ARM_NISV_TO_USER:
 	case KVM_CAP_ARM_INJECT_EXT_DABT:
+	case KVM_CAP_SET_GUEST_DEBUG:
+	case KVM_CAP_VCPU_ATTRIBUTES:
 		r = 1;
 		break;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
@@ -213,10 +215,35 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_STEAL_TIME:
 		r = kvm_arm_pvtime_supported();
 		break;
-	default:
-		r = kvm_arch_vm_ioctl_check_extension(kvm, ext);
+	case KVM_CAP_ARM_EL1_32BIT:
+		r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1);
+		break;
+	case KVM_CAP_GUEST_DEBUG_HW_BPS:
+		r = get_num_brps();
+		break;
+	case KVM_CAP_GUEST_DEBUG_HW_WPS:
+		r = get_num_wrps();
+		break;
+	case KVM_CAP_ARM_PMU_V3:
+		r = kvm_arm_support_pmu_v3();
+		break;
+	case KVM_CAP_ARM_INJECT_SERROR_ESR:
+		r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
+		break;
+	case KVM_CAP_ARM_VM_IPA_SIZE:
+		r = get_kvm_ipa_limit();
 		break;
+	case KVM_CAP_ARM_SVE:
+		r = system_supports_sve();
+		break;
+	case KVM_CAP_ARM_PTRAUTH_ADDRESS:
+	case KVM_CAP_ARM_PTRAUTH_GENERIC:
+		r = system_has_full_ptr_auth();
+		break;
+	default:
+		r = 0;
 	}
+
 	return r;
 }
 

arch/arm64/kvm/reset.c

@@ -42,58 +42,6 @@ static u32 kvm_ipa_limit;
 #define VCPU_RESET_PSTATE_SVC	(PSR_AA32_MODE_SVC | PSR_AA32_A_BIT | \
 				 PSR_AA32_I_BIT | PSR_AA32_F_BIT)
 
-static bool system_has_full_ptr_auth(void)
-{
-	return system_supports_address_auth() && system_supports_generic_auth();
-}
-
-/**
- * kvm_arch_vm_ioctl_check_extension
- *
- * We currently assume that the number of HW registers is uniform
- * across all CPUs (see cpuinfo_sanity_check).
- */
-int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
-{
-	int r;
-
-	switch (ext) {
-	case KVM_CAP_ARM_EL1_32BIT:
-		r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1);
-		break;
-	case KVM_CAP_GUEST_DEBUG_HW_BPS:
-		r = get_num_brps();
-		break;
-	case KVM_CAP_GUEST_DEBUG_HW_WPS:
-		r = get_num_wrps();
-		break;
-	case KVM_CAP_ARM_PMU_V3:
-		r = kvm_arm_support_pmu_v3();
-		break;
-	case KVM_CAP_ARM_INJECT_SERROR_ESR:
-		r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
-		break;
-	case KVM_CAP_SET_GUEST_DEBUG:
-	case KVM_CAP_VCPU_ATTRIBUTES:
-		r = 1;
-		break;
-	case KVM_CAP_ARM_VM_IPA_SIZE:
-		r = kvm_ipa_limit;
-		break;
-	case KVM_CAP_ARM_SVE:
-		r = system_supports_sve();
-		break;
-	case KVM_CAP_ARM_PTRAUTH_ADDRESS:
-	case KVM_CAP_ARM_PTRAUTH_GENERIC:
-		r = system_has_full_ptr_auth();
-		break;
-	default:
-		r = 0;
-	}
-
-	return r;
-}
-
 unsigned int kvm_sve_max_vl;
 
 int kvm_arm_init_sve(void)