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path: root/virt/kvm/coalesced_mmio.c
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Diffstat (limited to 'virt/kvm/coalesced_mmio.c')
-rw-r--r--virt/kvm/coalesced_mmio.c118
1 files changed, 47 insertions, 71 deletions
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index ae075dc0890..2316ec1aadc 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -24,23 +24,13 @@ static inline struct kvm_coalesced_mmio_dev *to_mmio(struct kvm_io_device *dev)
static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev,
gpa_t addr, int len)
{
- struct kvm_coalesced_mmio_zone *zone;
- int i;
-
- /* is it in a batchable area ? */
-
- for (i = 0; i < dev->nb_zones; i++) {
- zone = &dev->zone[i];
-
- /* (addr,len) is fully included in
- * (zone->addr, zone->size)
- */
+ /* is it in a batchable area ?
+ * (addr,len) is fully included in
+ * (zone->addr, zone->size)
+ */
- if (zone->addr <= addr &&
- addr + len <= zone->addr + zone->size)
- return 1;
- }
- return 0;
+ return (dev->zone.addr <= addr &&
+ addr + len <= dev->zone.addr + dev->zone.size);
}
static int coalesced_mmio_has_room(struct kvm_coalesced_mmio_dev *dev)
@@ -73,10 +63,10 @@ static int coalesced_mmio_write(struct kvm_io_device *this,
if (!coalesced_mmio_in_range(dev, addr, len))
return -EOPNOTSUPP;
- spin_lock(&dev->lock);
+ spin_lock(&dev->kvm->ring_lock);
if (!coalesced_mmio_has_room(dev)) {
- spin_unlock(&dev->lock);
+ spin_unlock(&dev->kvm->ring_lock);
return -EOPNOTSUPP;
}
@@ -87,7 +77,7 @@ static int coalesced_mmio_write(struct kvm_io_device *this,
memcpy(ring->coalesced_mmio[ring->last].data, val, len);
smp_wmb();
ring->last = (ring->last + 1) % KVM_COALESCED_MMIO_MAX;
- spin_unlock(&dev->lock);
+ spin_unlock(&dev->kvm->ring_lock);
return 0;
}
@@ -95,6 +85,8 @@ static void coalesced_mmio_destructor(struct kvm_io_device *this)
{
struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
+ list_del(&dev->list);
+
kfree(dev);
}
@@ -105,7 +97,6 @@ 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;
@@ -113,31 +104,18 @@ int kvm_coalesced_mmio_init(struct kvm *kvm)
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)
- 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;
-
- 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)
- goto out_free_dev;
+ ret = 0;
+ kvm->coalesced_mmio_ring = page_address(page);
- return ret;
+ /*
+ * We're using this spinlock to sync access to the coalesced ring.
+ * The list doesn't need it's own lock since device registration and
+ * unregistration should only happen when kvm->slots_lock is held.
+ */
+ spin_lock_init(&kvm->ring_lock);
+ INIT_LIST_HEAD(&kvm->coalesced_zones);
-out_free_dev:
- kvm->coalesced_mmio_dev = NULL;
- kfree(dev);
-out_free_page:
- kvm->coalesced_mmio_ring = NULL;
- __free_page(page);
out_err:
return ret;
}
@@ -151,51 +129,49 @@ void kvm_coalesced_mmio_free(struct kvm *kvm)
int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
struct kvm_coalesced_mmio_zone *zone)
{
- struct kvm_coalesced_mmio_dev *dev = kvm->coalesced_mmio_dev;
+ int ret;
+ struct kvm_coalesced_mmio_dev *dev;
- if (dev == NULL)
- return -ENXIO;
+ dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
+ dev->kvm = kvm;
+ dev->zone = *zone;
mutex_lock(&kvm->slots_lock);
- if (dev->nb_zones >= KVM_COALESCED_MMIO_ZONE_MAX) {
- mutex_unlock(&kvm->slots_lock);
- return -ENOBUFS;
- }
+ ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, &dev->dev);
+ if (ret < 0)
+ goto out_free_dev;
+ list_add_tail(&dev->list, &kvm->coalesced_zones);
+ mutex_unlock(&kvm->slots_lock);
- dev->zone[dev->nb_zones] = *zone;
- dev->nb_zones++;
+ return ret;
+out_free_dev:
mutex_unlock(&kvm->slots_lock);
+
+ kfree(dev);
+
+ if (dev == NULL)
+ return -ENXIO;
+
return 0;
}
int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
struct kvm_coalesced_mmio_zone *zone)
{
- int i;
- struct kvm_coalesced_mmio_dev *dev = kvm->coalesced_mmio_dev;
- struct kvm_coalesced_mmio_zone *z;
-
- if (dev == NULL)
- return -ENXIO;
+ struct kvm_coalesced_mmio_dev *dev, *tmp;
mutex_lock(&kvm->slots_lock);
- i = dev->nb_zones;
- while (i) {
- z = &dev->zone[i - 1];
-
- /* unregister all zones
- * included in (zone->addr, zone->size)
- */
-
- if (zone->addr <= z->addr &&
- z->addr + z->size <= zone->addr + zone->size) {
- dev->nb_zones--;
- *z = dev->zone[dev->nb_zones];
+ list_for_each_entry_safe(dev, tmp, &kvm->coalesced_zones, list)
+ if (coalesced_mmio_in_range(dev, zone->addr, zone->size)) {
+ kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &dev->dev);
+ kvm_iodevice_destructor(&dev->dev);
}
- i--;
- }
mutex_unlock(&kvm->slots_lock);