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Commit d329c035 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Avi Kivity
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KVM: s390: Fix refcounting and allow module unload 



Currently it is impossible to unload the kvm module on s390.
This patch fixes kvm_arch_destroy_vm to release all cpus.
This make it possible to unload the module.

In addition we stop messing with the module refcount in arch code.

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Acked-by: default avatarCarsten Otte <cotte@de.ibm.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 6b7ad61f

arch/s390/kvm/kvm-s390.c

+21 −14
Original line number Diff line number Diff line
@@ -185,8 +185,6 @@ struct kvm *kvm_arch_create_vm(void) 
	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);

	VM_EVENT(kvm, 3, "%s", "vm created");



	try_module_get(THIS_MODULE);



	return kvm;

out_nodbf:

	free_page((unsigned long)(kvm->arch.sca));
@@ -196,13 +194,32 @@ out_nokvm: 
	return ERR_PTR(rc);

}



void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)

{

	VCPU_EVENT(vcpu, 3, "%s", "free cpu");

	free_page((unsigned long)(vcpu->arch.sie_block));

	kfree(vcpu);

}



static void kvm_free_vcpus(struct kvm *kvm)

{

	unsigned int i;



	for (i = 0; i < KVM_MAX_VCPUS; ++i) {

		if (kvm->vcpus[i]) {

			kvm_arch_vcpu_destroy(kvm->vcpus[i]);

			kvm->vcpus[i] = NULL;

		}

	}

}



void kvm_arch_destroy_vm(struct kvm *kvm)

{

	debug_unregister(kvm->arch.dbf);

	kvm_free_vcpus(kvm);

	kvm_free_physmem(kvm);

	free_page((unsigned long)(kvm->arch.sca));

	debug_unregister(kvm->arch.dbf);

	kfree(kvm);

	module_put(THIS_MODULE);

}



/* Section: vcpu related */
@@ -308,8 +325,6 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, 
	VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,

		 vcpu->arch.sie_block);



	try_module_get(THIS_MODULE);



	return vcpu;

out_free_cpu:

	kfree(vcpu);
@@ -317,14 +332,6 @@ out_nomem: 
	return ERR_PTR(rc);

}



void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)

{

	VCPU_EVENT(vcpu, 3, "%s", "destroy cpu");

	free_page((unsigned long)(vcpu->arch.sie_block));

	kfree(vcpu);

	module_put(THIS_MODULE);

}



int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)

{

	/* kvm common code refers to this, but never calls it */