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OpenCloudOS-Kernel
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KVM: s390: use kvm->created_vcpus 

The new created_vcpus field avoids possible races between enabling
capabilities and creating VCPUs.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-06-13 14:50:04 +02:00
parent 557abc40d1
commit a03825bbd0
1 changed files with 5 additions and 5 deletions
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10
arch/s390/kvm/kvm-s390.c
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@ -422,7 +422,7 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
break;
case KVM_CAP_S390_VECTOR_REGISTERS:
mutex_lock(&kvm->lock);
if (atomic_read(&kvm->online_vcpus)) {
if (kvm->created_vcpus) {
r = -EBUSY;
} else if (MACHINE_HAS_VX) {
set_kvm_facility(kvm->arch.model.fac_mask, 129);
@ -437,7 +437,7 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
case KVM_CAP_S390_RI:
r = -EINVAL;
mutex_lock(&kvm->lock);
if (atomic_read(&kvm->online_vcpus)) {
if (kvm->created_vcpus) {
r = -EBUSY;
} else if (test_facility(64)) {
set_kvm_facility(kvm->arch.model.fac_mask, 64);
@ -492,7 +492,7 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
ret = -EBUSY;
VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
mutex_lock(&kvm->lock);
if (atomic_read(&kvm->online_vcpus) == 0) {
if (!kvm->created_vcpus) {
kvm->arch.use_cmma = 1;
ret = 0;
}
@ -536,7 +536,7 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
ret = -EBUSY;
mutex_lock(&kvm->lock);
if (atomic_read(&kvm->online_vcpus) == 0) {
if (!kvm->created_vcpus) {
/* gmap_alloc will round the limit up */
struct gmap *new = gmap_alloc(current->mm, new_limit);
@ -713,7 +713,7 @@ static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
int ret = 0;
mutex_lock(&kvm->lock);
if (atomic_read(&kvm->online_vcpus)) {
if (kvm->created_vcpus) {
ret = -EBUSY;
goto out;
}