KVM: arm64: refactor kvm_vcpu_enable_ptrauth() for hyp use

Move kvm_vcpu_enable_ptrauth() to a shared header to be used by
hyp in protected mode.

No functional change intended.

Signed-off-by: Fuad Tabba <tabba@google.com>

arch/arm64/include/asm/kvm_emulate.h

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 5956222..7e0ff04 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -41,6 +41,22 @@ void kvm_inject_vabt(struct kvm_vcpu *vcpu);
 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
 
+static inline int kvm_vcpu_enable_ptrauth(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * For now make sure that both address/generic pointer authentication
+	 * features are requested by the userspace together and the system
+	 * supports these capabilities.
+	 */
+	if (!test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||
+	    !test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features) ||
+	    !system_has_full_ptr_auth())
+		return -EINVAL;
+
+	vcpu->arch.flags |= KVM_ARM64_GUEST_HAS_PTRAUTH;
+	return 0;
+}
+
 static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
 {
 	return !(vcpu->arch.hcr_el2 & HCR_RW);

arch/arm64/kvm/reset.c

diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 35f9ded..3f090d2 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -109,7 +109,7 @@ static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu)
 		kfree(buf);
 		return ret;
 	}
-	
+
 	vcpu->arch.sve_state = buf;
 	vcpu->arch.flags |= KVM_ARM64_VCPU_SVE_FINALIZED;
 	return 0;
@@ -156,22 +156,6 @@ static void kvm_vcpu_reset_sve(struct kvm_vcpu *vcpu)
 		memset(vcpu->arch.sve_state, 0, vcpu_sve_state_size(vcpu));
 }
 
-static int kvm_vcpu_enable_ptrauth(struct kvm_vcpu *vcpu)
-{
-	/*
-	 * For now make sure that both address/generic pointer authentication
-	 * features are requested by the userspace together and the system
-	 * supports these capabilities.
-	 */
-	if (!test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||
-	    !test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features) ||
-	    !system_has_full_ptr_auth())
-		return -EINVAL;
-
-	vcpu->arch.flags |= KVM_ARM64_GUEST_HAS_PTRAUTH;
-	return 0;
-}
-
 static bool vcpu_allowed_register_width(struct kvm_vcpu *vcpu)
 {
 	struct kvm_vcpu *tmp;