From d76685c4a074041ed168e0b04dd604c3df5dcaa5 Mon Sep 17 00:00:00 2001 From: Gregory Haskins Date: Mon, 1 Jun 2009 12:54:50 -0400 Subject: 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 Acked-by: Chris Wright Signed-off-by: Avi Kivity --- arch/x86/kvm/i8254.c | 40 ++++++++++++++++++++++++++++------------ arch/x86/kvm/i8259.c | 20 ++++++++++++++------ arch/x86/kvm/lapic.c | 22 +++++++++++++++------- arch/x86/kvm/x86.c | 2 +- virt/kvm/coalesced_mmio.c | 25 +++++++++++++++---------- virt/kvm/ioapic.c | 22 +++++++++++++++------- virt/kvm/iodev.h | 29 ++++++++++++++++++++--------- virt/kvm/kvm_main.c | 2 +- 8 files changed, 109 insertions(+), 53 deletions(-) diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index 0990bc9aac1f..e800d2d66266 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -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); } diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 1ccb50c74f18..2520922282d5 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -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; } diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index ae99d83f81a3..4bfd458a4f3e 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -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: diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5eb3b8dd74b8..75e9df097845 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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; diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c index 03ea2807b1f2..c4c7ec2f9d30 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 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); diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index 1150c6d5c7b8..469b9faae665 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -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; diff --git a/virt/kvm/iodev.h b/virt/kvm/iodev.h index 55e8846ac3a6..2c67f5acd6db 100644 --- a/virt/kvm/iodev.h +++ b/virt/kvm/iodev.h @@ -18,7 +18,9 @@ #include -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__ */ diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 2d9bc439d9a9..d1f9c87daa87 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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; } -- cgit v1.2.2