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KVM: cleanup io_device code

Browse source 
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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40
arch/x86/kvm/i8254.c
View file

@ -350,10 +350,20 @@ void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val)
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
}
static inline struct kvm_pit *dev_to_pit(struct kvm_io_device *dev)
{
return container_of(dev, struct kvm_pit, dev);
}
static inline struct kvm_pit *speaker_to_pit(struct kvm_io_device *dev)
{
return container_of(dev, struct kvm_pit, speaker_dev);
}
static void pit_ioport_write(struct kvm_io_device *this,
gpa_t addr, int len, const void *data)
{
struct kvm_pit *pit = (struct kvm_pit *)this->private;
struct kvm_pit *pit = dev_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
int channel, access;
@ -426,7 +436,7 @@ static void pit_ioport_write(struct kvm_io_device *this,
static void pit_ioport_read(struct kvm_io_device *this,
gpa_t addr, int len, void *data)
{
struct kvm_pit *pit = (struct kvm_pit *)this->private;
struct kvm_pit *pit = dev_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
int ret, count;
@ -497,7 +507,7 @@ static int pit_in_range(struct kvm_io_device *this, gpa_t addr,
static void speaker_ioport_write(struct kvm_io_device *this,
gpa_t addr, int len, const void *data)
{
struct kvm_pit *pit = (struct kvm_pit *)this->private;
struct kvm_pit *pit = speaker_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
u32 val = *(u32 *) data;
@ -511,7 +521,7 @@ static void speaker_ioport_write(struct kvm_io_device *this,
static void speaker_ioport_read(struct kvm_io_device *this,
gpa_t addr, int len, void *data)
{
struct kvm_pit *pit = (struct kvm_pit *)this->private;
struct kvm_pit *pit = speaker_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
unsigned int refresh_clock;
@ -563,6 +573,18 @@ static void pit_mask_notifer(struct kvm_irq_mask_notifier *kimn, bool mask)
}
}
static const struct kvm_io_device_ops pit_dev_ops = {
.read = pit_ioport_read,
.write = pit_ioport_write,
.in_range = pit_in_range,
};
static const struct kvm_io_device_ops speaker_dev_ops = {
.read = speaker_ioport_read,
.write = speaker_ioport_write,
.in_range = speaker_in_range,
};
struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
{
struct kvm_pit *pit;
@ -583,17 +605,11 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
spin_lock_init(&pit->pit_state.inject_lock);
/* Initialize PIO device */
pit->dev.read = pit_ioport_read;
pit->dev.write = pit_ioport_write;
pit->dev.in_range = pit_in_range;
pit->dev.private = pit;
kvm_iodevice_init(&pit->dev, &pit_dev_ops);
kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
if (flags & KVM_PIT_SPEAKER_DUMMY) {
pit->speaker_dev.read = speaker_ioport_read;
pit->speaker_dev.write = speaker_ioport_write;
pit->speaker_dev.in_range = speaker_in_range;
pit->speaker_dev.private = pit;
kvm_iodevice_init(&pit->speaker_dev, &speaker_dev_ops);
kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
}

20
arch/x86/kvm/i8259.c
View file

@ -444,10 +444,15 @@ static int picdev_in_range(struct kvm_io_device *this, gpa_t addr,
}
}
static inline struct kvm_pic *to_pic(struct kvm_io_device *dev)
{
return container_of(dev, struct kvm_pic, dev);
}
static void picdev_write(struct kvm_io_device *this,
gpa_t addr, int len, const void *val)
{
struct kvm_pic *s = this->private;
struct kvm_pic *s = to_pic(this);
unsigned char data = *(unsigned char *)val;
if (len != 1) {
@ -474,7 +479,7 @@ static void picdev_write(struct kvm_io_device *this,
static void picdev_read(struct kvm_io_device *this,
gpa_t addr, int len, void *val)
{
struct kvm_pic *s = this->private;
struct kvm_pic *s = to_pic(this);
unsigned char data = 0;
if (len != 1) {
@ -516,6 +521,12 @@ static void pic_irq_request(void *opaque, int level)
}
}
static const struct kvm_io_device_ops picdev_ops = {
.read = picdev_read,
.write = picdev_write,
.in_range = picdev_in_range,
};
struct kvm_pic *kvm_create_pic(struct kvm *kvm)
{
struct kvm_pic *s;
@ -534,10 +545,7 @@ struct kvm_pic *kvm_create_pic(struct kvm *kvm)
/*
* Initialize PIO device
*/
s->dev.read = picdev_read;
s->dev.write = picdev_write;
s->dev.in_range = picdev_in_range;
s->dev.private = s;
kvm_iodevice_init(&s->dev, &picdev_ops);
kvm_io_bus_register_dev(&kvm->pio_bus, &s->dev);
return s;
}

22
arch/x86/kvm/lapic.c
View file

@ -522,10 +522,15 @@ static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
return val;
}
static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
{
return container_of(dev, struct kvm_lapic, dev);
}
static void apic_mmio_read(struct kvm_io_device *this,
gpa_t address, int len, void *data)
{
struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
struct kvm_lapic *apic = to_lapic(this);
unsigned int offset = address - apic->base_address;
unsigned char alignment = offset & 0xf;
u32 result;
@ -606,7 +611,7 @@ static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
static void apic_mmio_write(struct kvm_io_device *this,
gpa_t address, int len, const void *data)
{
struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
struct kvm_lapic *apic = to_lapic(this);
unsigned int offset = address - apic->base_address;
unsigned char alignment = offset & 0xf;
u32 val;
@ -723,7 +728,7 @@ static void apic_mmio_write(struct kvm_io_device *this,
static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
int len, int size)
{
struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
struct kvm_lapic *apic = to_lapic(this);
int ret = 0;
@ -917,6 +922,12 @@ static struct kvm_timer_ops lapic_timer_ops = {
.is_periodic = lapic_is_periodic,
};
static const struct kvm_io_device_ops apic_mmio_ops = {
.read = apic_mmio_read,
.write = apic_mmio_write,
.in_range = apic_mmio_range,
};
int kvm_create_lapic(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic;
@ -951,10 +962,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
kvm_lapic_reset(vcpu);
apic->dev.read = apic_mmio_read;
apic->dev.write = apic_mmio_write;
apic->dev.in_range = apic_mmio_range;
apic->dev.private = apic;
kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
return 0;
nomem_free_apic:

2
arch/x86/kvm/x86.c
View file

@ -2264,7 +2264,7 @@ static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
if (vcpu->arch.apic) {
dev = &vcpu->arch.apic->dev;
if (dev->in_range(dev, addr, len, is_write))
if (kvm_iodevice_in_range(dev, addr, len, is_write))
return dev;
}
return NULL;

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;
}