KVM: cleanup io_device code
We modernize the io_device code so that we use container_of() instead of
dev->private, and move the vtable to a separate ops structure
(theoretically allows better caching for multiple instances of the same
ops structure)
Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 03ea280..c4c7ec2 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -14,11 +14,15 @@
#include "coalesced_mmio.h"
+static inline struct kvm_coalesced_mmio_dev *to_mmio(struct kvm_io_device *dev)
+{
+ return container_of(dev, struct kvm_coalesced_mmio_dev, dev);
+}
+
static int coalesced_mmio_in_range(struct kvm_io_device *this,
gpa_t addr, int len, int is_write)
{
- struct kvm_coalesced_mmio_dev *dev =
- (struct kvm_coalesced_mmio_dev*)this->private;
+ struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
struct kvm_coalesced_mmio_zone *zone;
int next;
int i;
@@ -63,8 +67,7 @@
static void coalesced_mmio_write(struct kvm_io_device *this,
gpa_t addr, int len, const void *val)
{
- struct kvm_coalesced_mmio_dev *dev =
- (struct kvm_coalesced_mmio_dev*)this->private;
+ struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
struct kvm_coalesced_mmio_ring *ring = dev->kvm->coalesced_mmio_ring;
/* kvm->lock must be taken by caller before call to in_range()*/
@@ -80,12 +83,17 @@
static void coalesced_mmio_destructor(struct kvm_io_device *this)
{
- struct kvm_coalesced_mmio_dev *dev =
- (struct kvm_coalesced_mmio_dev *)this->private;
+ struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
kfree(dev);
}
+static const struct kvm_io_device_ops coalesced_mmio_ops = {
+ .write = coalesced_mmio_write,
+ .in_range = coalesced_mmio_in_range,
+ .destructor = coalesced_mmio_destructor,
+};
+
int kvm_coalesced_mmio_init(struct kvm *kvm)
{
struct kvm_coalesced_mmio_dev *dev;
@@ -93,10 +101,7 @@
dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
- dev->dev.write = coalesced_mmio_write;
- dev->dev.in_range = coalesced_mmio_in_range;
- dev->dev.destructor = coalesced_mmio_destructor;
- dev->dev.private = dev;
+ kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
dev->kvm = kvm;
kvm->coalesced_mmio_dev = dev;
kvm_io_bus_register_dev(&kvm->mmio_bus, &dev->dev);