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-rw-r--r--virt/kvm/arm/vgic.c63
1 files changed, 61 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 5e9df47778f..b15d6c17a09 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1433,20 +1433,45 @@ out:
int kvm_vgic_create(struct kvm *kvm)
{
- int ret = 0;
+ int i, vcpu_lock_idx = -1, ret = 0;
+ struct kvm_vcpu *vcpu;
mutex_lock(&kvm->lock);
- if (atomic_read(&kvm->online_vcpus) || kvm->arch.vgic.vctrl_base) {
+ if (kvm->arch.vgic.vctrl_base) {
ret = -EEXIST;
goto out;
}
+ /*
+ * Any time a vcpu is run, vcpu_load is called which tries to grab the
+ * vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure
+ * that no other VCPUs are run while we create the vgic.
+ */
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (!mutex_trylock(&vcpu->mutex))
+ goto out_unlock;
+ vcpu_lock_idx = i;
+ }
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (vcpu->arch.has_run_once) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ }
+
spin_lock_init(&kvm->arch.vgic.lock);
kvm->arch.vgic.vctrl_base = vgic_vctrl_base;
kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
+out_unlock:
+ for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
+ vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
+ mutex_unlock(&vcpu->mutex);
+ }
+
out:
mutex_unlock(&kvm->lock);
return ret;
@@ -1510,3 +1535,37 @@ int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
mutex_unlock(&kvm->lock);
return r;
}
+
+static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+ return -ENXIO;
+}
+
+static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+ return -ENXIO;
+}
+
+static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+ return -ENXIO;
+}
+
+static void vgic_destroy(struct kvm_device *dev)
+{
+ kfree(dev);
+}
+
+static int vgic_create(struct kvm_device *dev, u32 type)
+{
+ return kvm_vgic_create(dev->kvm);
+}
+
+struct kvm_device_ops kvm_arm_vgic_v2_ops = {
+ .name = "kvm-arm-vgic",
+ .create = vgic_create,
+ .destroy = vgic_destroy,
+ .set_attr = vgic_set_attr,
+ .get_attr = vgic_get_attr,
+ .has_attr = vgic_has_attr,
+};