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/ioapic.c b/virt/kvm/ioapic.c
index 1150c6d..469b9fa 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -220,10 +220,15 @@
__kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
}
+static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
+{
+ return container_of(dev, struct kvm_ioapic, dev);
+}
+
static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
int len, int is_write)
{
- struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
+ struct kvm_ioapic *ioapic = to_ioapic(this);
return ((addr >= ioapic->base_address &&
(addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
@@ -232,7 +237,7 @@
static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
void *val)
{
- struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
+ struct kvm_ioapic *ioapic = to_ioapic(this);
u32 result;
ioapic_debug("addr %lx\n", (unsigned long)addr);
@@ -269,7 +274,7 @@
static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
const void *val)
{
- struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
+ struct kvm_ioapic *ioapic = to_ioapic(this);
u32 data;
ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
@@ -314,6 +319,12 @@
ioapic->id = 0;
}
+static const struct kvm_io_device_ops ioapic_mmio_ops = {
+ .read = ioapic_mmio_read,
+ .write = ioapic_mmio_write,
+ .in_range = ioapic_in_range,
+};
+
int kvm_ioapic_init(struct kvm *kvm)
{
struct kvm_ioapic *ioapic;
@@ -323,10 +334,7 @@
return -ENOMEM;
kvm->arch.vioapic = ioapic;
kvm_ioapic_reset(ioapic);
- ioapic->dev.read = ioapic_mmio_read;
- ioapic->dev.write = ioapic_mmio_write;
- ioapic->dev.in_range = ioapic_in_range;
- ioapic->dev.private = ioapic;
+ kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
ioapic->kvm = kvm;
kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev);
return 0;