KVM: arm/arm64: Rename kvm_arm_config_vm to kvm_arm_setup_stage2

VM tends to be a very overloaded term in KVM, so let's keep it
to describe the virtual machine. For the virtual memory setup,
let's use the "stage2" suffix.
Reviewed-by: NEric Auger <eric.auger@redhat.com>
Reviewed-by: NSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

arch/arm/include/asm/kvm_host.h

@@ -354,8 +354,12 @@ static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
 struct kvm *kvm_arch_alloc_vm(void);
 void kvm_arch_free_vm(struct kvm *kvm);
 
-static inline int kvm_arm_config_vm(struct kvm *kvm, unsigned long type)
+static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 {
+	/*
+	 * On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
+	 * so any non-zero value used as type is illegal.
+	 */
 	if (type)
 		return -EINVAL;
 	return 0;

arch/arm64/include/asm/kvm_arm.h

@@ -133,7 +133,7 @@
  * 40 bits wide (T0SZ = 24).  Systems with a PARange smaller than 40 bits are
  * not known to exist and will break with this configuration.
  *
- * The VTCR_EL2 is configured per VM and is initialised in kvm_arm_config_vm().
+ * The VTCR_EL2 is configured per VM and is initialised in kvm_arm_setup_stage2().
  *
  * Note that when using 4K pages, we concatenate two first level page tables
  * together. With 16K pages, we concatenate 16 first level page tables.

arch/arm64/include/asm/kvm_host.h

@@ -511,6 +511,6 @@ void kvm_set_ipa_limit(void);
 struct kvm *kvm_arch_alloc_vm(void);
 void kvm_arch_free_vm(struct kvm *kvm);
 
-int kvm_arm_config_vm(struct kvm *kvm, unsigned long type);
+int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type);
 
 #endif /* __ARM64_KVM_HOST_H__ */

arch/arm64/kvm/reset.c

@@ -189,7 +189,7 @@ void kvm_set_ipa_limit(void)
  * all CPUs, as it is safe to run with or without the feature and
  * the bit is RES0 on CPUs that don't support it.
  */
-int kvm_arm_config_vm(struct kvm *kvm, unsigned long type)
+int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 {
 	u64 vtcr = VTCR_EL2_FLAGS;
 	u32 parange, phys_shift;

virt/kvm/arm/arm.c

@@ -120,7 +120,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 {
 	int ret, cpu;
 
-	ret = kvm_arm_config_vm(kvm, type);
+	ret = kvm_arm_setup_stage2(kvm, type);
 	if (ret)
 		return ret;