KVM: PPC: Move processor compatibility check to module init

Move KVM PPC's compatibility checks to their respective module_init()
hooks, there's no need to wait until KVM's common compat check, nor is
there a need to perform the check on every CPU (provided by common KVM's
hook), as the compatibility checks operate on global data.

  arch/powerpc/include/asm/cputable.h: extern struct cpu_spec *cur_cpu_spec;
  arch/powerpc/kvm/book3s.c: return 0
  arch/powerpc/kvm/e500.c: strcmp(cur_cpu_spec->cpu_name, "e500v2")
  arch/powerpc/kvm/e500mc.c: strcmp(cur_cpu_spec->cpu_name, "e500mc")
                             strcmp(cur_cpu_spec->cpu_name, "e5500")
                             strcmp(cur_cpu_spec->cpu_name, "e6500")

Cc: Fabiano Rosas <farosas@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Message-Id: <20221130230934.1014142-27-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/powerpc/include/asm/kvm_ppc.h

@@ -118,7 +118,6 @@ extern int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr,
 extern int kvmppc_core_vcpu_create(struct kvm_vcpu *vcpu);
 extern void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu);
 extern int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu);
-extern int kvmppc_core_check_processor_compat(void);
 extern int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
                                       struct kvm_translation *tr);
 

arch/powerpc/kvm/book3s.c

@@ -999,16 +999,6 @@ int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvmppc_h_logical_ci_store);
 
-int kvmppc_core_check_processor_compat(void)
-{
-	/*
-	 * We always return 0 for book3s. We check
-	 * for compatibility while loading the HV
-	 * or PR module
-	 */
-	return 0;
-}
-
 int kvmppc_book3s_hcall_implemented(struct kvm *kvm, unsigned long hcall)
 {
 	return kvm->arch.kvm_ops->hcall_implemented(hcall);

arch/powerpc/kvm/e500.c

@@ -314,7 +314,7 @@ static void kvmppc_core_vcpu_put_e500(struct kvm_vcpu *vcpu)
 	kvmppc_booke_vcpu_put(vcpu);
 }
 
-int kvmppc_core_check_processor_compat(void)
+static int kvmppc_e500_check_processor_compat(void)
 {
 	int r;
 
@@ -507,7 +507,7 @@ static int __init kvmppc_e500_init(void)
 	unsigned long handler_len;
 	unsigned long max_ivor = 0;
 
-	r = kvmppc_core_check_processor_compat();
+	r = kvmppc_e500_check_processor_compat();
 	if (r)
 		goto err_out;
 

arch/powerpc/kvm/e500mc.c

@@ -388,6 +388,10 @@ static int __init kvmppc_e500mc_init(void)
 {
 	int r;
 
+	r = kvmppc_e500mc_check_processor_compat();
+	if (r)
+		return kvmppc_e500mc;
+
 	r = kvmppc_booke_init();
 	if (r)
 		goto err_out;

arch/powerpc/kvm/powerpc.c

@@ -442,7 +442,7 @@ int kvm_arch_hardware_enable(void)
 
 int kvm_arch_check_processor_compat(void *opaque)
 {
-	return kvmppc_core_check_processor_compat();
+	return 0;
 }
 
 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)