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s390/mm: add reference counter to gmap structure

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Let's use a reference counter mechanism to control the lifetime of
gmap structures. This will be needed for further changes related to
gmap shadows.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2016-03-08 11:55:04 +01:00
committed by Christian Borntraeger
parent b2d73b2a0a
commit 6ea427bbbd
3 changed files with 85 additions and 30 deletions
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16
arch/s390/kvm/kvm-s390.c
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@@ -532,20 +532,20 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
if (!new_limit)
return -EINVAL;
/* gmap_alloc takes last usable address */
/* gmap_create takes last usable address */
if (new_limit != KVM_S390_NO_MEM_LIMIT)
new_limit -= 1;
ret = -EBUSY;
mutex_lock(&kvm->lock);
if (!kvm->created_vcpus) {
/* gmap_alloc will round the limit up */
struct gmap *new = gmap_alloc(current->mm, new_limit);
/* gmap_create will round the limit up */
struct gmap *new = gmap_create(current->mm, new_limit);
if (!new) {
ret = -ENOMEM;
} else {
gmap_free(kvm->arch.gmap);
gmap_remove(kvm->arch.gmap);
new->private = kvm;
kvm->arch.gmap = new;
ret = 0;
@@ -1394,7 +1394,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
else
kvm->arch.mem_limit = min_t(unsigned long, TASK_MAX_SIZE,
sclp.hamax + 1);
kvm->arch.gmap = gmap_alloc(current->mm, kvm->arch.mem_limit - 1);
kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
if (!kvm->arch.gmap)
goto out_err;
kvm->arch.gmap->private = kvm;
@@ -1427,7 +1427,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
sca_del_vcpu(vcpu);
if (kvm_is_ucontrol(vcpu->kvm))
gmap_free(vcpu->arch.gmap);
gmap_remove(vcpu->arch.gmap);
if (vcpu->kvm->arch.use_cmma)
kvm_s390_vcpu_unsetup_cmma(vcpu);
@@ -1460,7 +1460,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
debug_unregister(kvm->arch.dbf);
free_page((unsigned long)kvm->arch.sie_page2);
if (!kvm_is_ucontrol(kvm))
gmap_free(kvm->arch.gmap);
gmap_remove(kvm->arch.gmap);
kvm_s390_destroy_adapters(kvm);
kvm_s390_clear_float_irqs(kvm);
KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
@@ -1469,7 +1469,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
/* Section: vcpu related */
static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
{
vcpu->arch.gmap = gmap_alloc(current->mm, -1UL);
vcpu->arch.gmap = gmap_create(current->mm, -1UL);
if (!vcpu->arch.gmap)
return -ENOMEM;
vcpu->arch.gmap->private = vcpu->kvm;