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KVM: cleanup io_device code

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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>
This commit is contained in:
Gregory Haskins
2009-06-01 12:54:50 -04:00
committed by Avi Kivity
parent 787a660a4f
commit d76685c4a0
8 changed files with 110 additions and 54 deletions
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25
virt/kvm/coalesced_mmio.c
View File

@@ -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 int coalesced_mmio_in_range(struct kvm_io_device *this,
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_write(struct kvm_io_device *this,
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 @@ int kvm_coalesced_mmio_init(struct kvm *kvm)
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);

22
virt/kvm/ioapic.c
View File

@@ -220,10 +220,15 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
__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 int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
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_read(struct kvm_io_device *this, gpa_t addr, int len,
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 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
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 @@ int kvm_ioapic_init(struct kvm *kvm)
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;

31
virt/kvm/iodev.h
View File

@@ -18,7 +18,9 @@
#include <linux/kvm_types.h>
struct kvm_io_device {
struct kvm_io_device;
struct kvm_io_device_ops {
void (*read)(struct kvm_io_device *this,
gpa_t addr,
int len,
@@ -30,16 +32,25 @@ struct kvm_io_device {
int (*in_range)(struct kvm_io_device *this, gpa_t addr, int len,
int is_write);
void (*destructor)(struct kvm_io_device *this);
void *private;
};
struct kvm_io_device {
const struct kvm_io_device_ops *ops;
};
static inline void kvm_iodevice_init(struct kvm_io_device *dev,
const struct kvm_io_device_ops *ops)
{
dev->ops = ops;
}
static inline void kvm_iodevice_read(struct kvm_io_device *dev,
gpa_t addr,
int len,
void *val)
{
dev->read(dev, addr, len, val);
dev->ops->read(dev, addr, len, val);
}
static inline void kvm_iodevice_write(struct kvm_io_device *dev,
@@ -47,19 +58,19 @@ static inline void kvm_iodevice_write(struct kvm_io_device *dev,
int len,
const void *val)
{
dev->write(dev, addr, len, val);
dev->ops->write(dev, addr, len, val);
}
static inline int kvm_iodevice_inrange(struct kvm_io_device *dev,
gpa_t addr, int len, int is_write)
static inline int kvm_iodevice_in_range(struct kvm_io_device *dev,
gpa_t addr, int len, int is_write)
{
return dev->in_range(dev, addr, len, is_write);
return dev->ops->in_range(dev, addr, len, is_write);
}
static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
{
if (dev->destructor)
dev->destructor(dev);
if (dev->ops->destructor)
dev->ops->destructor(dev);
}
#endif /* __KVM_IODEV_H__ */

2
virt/kvm/kvm_main.c
View File

@@ -2463,7 +2463,7 @@ struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
for (i = 0; i < bus->dev_count; i++) {
struct kvm_io_device *pos = bus->devs[i];
if (pos->in_range(pos, addr, len, is_write))
if (kvm_iodevice_in_range(pos, addr, len, is_write))
return pos;
}