kvm: use kvfree() in kvm_arch_free_vm()

By switching from kfree() to kvfree() in kvm_arch_free_vm() Arm64 can
use the common variant. This can be accomplished by adding another
macro __KVM_HAVE_ARCH_VM_FREE, which will be used only by x86 for now.

Further simplification can be achieved by adding __kvm_arch_free_vm()
doing the common part.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-Id: <20210903130808.30142-5-jgross@suse.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/arm64/include/asm/kvm_host.h

@@ -771,7 +771,6 @@ int kvm_set_ipa_limit(void);
 
 #define __KVM_HAVE_ARCH_VM_ALLOC
 struct kvm *kvm_arch_alloc_vm(void);
-void kvm_arch_free_vm(struct kvm *kvm);
 
 int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type);
 

arch/arm64/kvm/arm.c

@@ -297,14 +297,6 @@ struct kvm *kvm_arch_alloc_vm(void)
 	return vzalloc(sizeof(struct kvm));
 }
 
-void kvm_arch_free_vm(struct kvm *kvm)
-{
-	if (!has_vhe())
-		kfree(kvm);
-	else
-		vfree(kvm);
-}
-
 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 {
 	if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))

arch/x86/include/asm/kvm_host.h

@@ -1540,6 +1540,8 @@ static inline struct kvm *kvm_arch_alloc_vm(void)
 {
 	return __vmalloc(kvm_x86_ops.vm_size, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 }
+
+#define __KVM_HAVE_ARCH_VM_FREE
 void kvm_arch_free_vm(struct kvm *kvm);
 
 #define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB

arch/x86/kvm/x86.c

@@ -11130,7 +11130,7 @@ void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
 void kvm_arch_free_vm(struct kvm *kvm)
 {
 	kfree(to_kvm_hv(kvm)->hv_pa_pg);
-	vfree(kvm);
+	__kvm_arch_free_vm(kvm);
 }
 
 

include/linux/kvm_host.h

@@ -1081,10 +1081,17 @@ static inline struct kvm *kvm_arch_alloc_vm(void)
 {
 	return kzalloc(sizeof(struct kvm), GFP_KERNEL);
 }
+#endif
+
+static inline void __kvm_arch_free_vm(struct kvm *kvm)
+{
+	kvfree(kvm);
+}
 
+#ifndef __KVM_HAVE_ARCH_VM_FREE
 static inline void kvm_arch_free_vm(struct kvm *kvm)
 {
-	kfree(kvm);
+	__kvm_arch_free_vm(kvm);
 }
 #endif