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Diffstat (limited to 'virt/kvm/coalesced_mmio.c')
-rw-r--r--virt/kvm/coalesced_mmio.c43
1 files changed, 33 insertions, 10 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 04d69cd7049..5169736377a 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -92,41 +92,64 @@ static const struct kvm_io_device_ops coalesced_mmio_ops = {
int kvm_coalesced_mmio_init(struct kvm *kvm)
{
struct kvm_coalesced_mmio_dev *dev;
+ struct page *page;
int ret;
+ ret = -ENOMEM;
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ goto out_err;
+ kvm->coalesced_mmio_ring = page_address(page);
+
+ ret = -ENOMEM;
dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
if (!dev)
- return -ENOMEM;
+ goto out_free_page;
spin_lock_init(&dev->lock);
kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
dev->kvm = kvm;
kvm->coalesced_mmio_dev = dev;
- ret = kvm_io_bus_register_dev(kvm, &kvm->mmio_bus, &dev->dev);
+ mutex_lock(&kvm->slots_lock);
+ ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, &dev->dev);
+ mutex_unlock(&kvm->slots_lock);
if (ret < 0)
- kfree(dev);
+ goto out_free_dev;
+
+ return ret;
+out_free_dev:
+ kfree(dev);
+out_free_page:
+ __free_page(page);
+out_err:
return ret;
}
+void kvm_coalesced_mmio_free(struct kvm *kvm)
+{
+ if (kvm->coalesced_mmio_ring)
+ free_page((unsigned long)kvm->coalesced_mmio_ring);
+}
+
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
- struct kvm_coalesced_mmio_zone *zone)
+ struct kvm_coalesced_mmio_zone *zone)
{
struct kvm_coalesced_mmio_dev *dev = kvm->coalesced_mmio_dev;
if (dev == NULL)
return -EINVAL;
- down_write(&kvm->slots_lock);
+ mutex_lock(&kvm->slots_lock);
if (dev->nb_zones >= KVM_COALESCED_MMIO_ZONE_MAX) {
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return -ENOBUFS;
}
dev->zone[dev->nb_zones] = *zone;
dev->nb_zones++;
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return 0;
}
@@ -140,10 +163,10 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
if (dev == NULL)
return -EINVAL;
- down_write(&kvm->slots_lock);
+ mutex_lock(&kvm->slots_lock);
i = dev->nb_zones;
- while(i) {
+ while (i) {
z = &dev->zone[i - 1];
/* unregister all zones
@@ -158,7 +181,7 @@ int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
i--;
}
- up_write(&kvm->slots_lock);
+ mutex_unlock(&kvm->slots_lock);
return 0;
}