arch/x86/kvm/irq.h

Source file repositories/reference/linux-study-clean/arch/x86/kvm/irq.h

File Facts

System
Linux kernel
Corpus path
arch/x86/kvm/irq.h
Extension
.h
Size
3130 bytes
Lines
125
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct kvm_kpic_state {
	u8 last_irr;	/* edge detection */
	u8 irr;		/* interrupt request register */
	u8 imr;		/* interrupt mask register */
	u8 isr;		/* interrupt service register */
	u8 priority_add;	/* highest irq priority */
	u8 irq_base;
	u8 read_reg_select;
	u8 poll;
	u8 special_mask;
	u8 init_state;
	u8 auto_eoi;
	u8 rotate_on_auto_eoi;
	u8 special_fully_nested_mode;
	u8 init4;		/* true if 4 byte init */
	u8 elcr;		/* PIIX edge/trigger selection */
	u8 elcr_mask;
	u8 isr_ack;	/* interrupt ack detection */
	struct kvm_pic *pics_state;
};

struct kvm_pic {
	spinlock_t lock;
	bool wakeup_needed;
	unsigned pending_acks;
	struct kvm *kvm;
	struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
	int output;		/* intr from master PIC */
	struct kvm_io_device dev_master;
	struct kvm_io_device dev_slave;
	struct kvm_io_device dev_elcr;
	unsigned long irq_states[PIC_NUM_PINS];
};

int kvm_pic_init(struct kvm *kvm);
void kvm_pic_destroy(struct kvm *kvm);
int kvm_pic_read_irq(struct kvm *kvm);
void kvm_pic_update_irq(struct kvm_pic *s);
int kvm_pic_set_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
		    int irq_source_id, int level, bool line_status);

int kvm_setup_default_ioapic_and_pic_routing(struct kvm *kvm);

int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);
int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);

static inline int irqchip_full(struct kvm *kvm)
{
	int mode = kvm->arch.irqchip_mode;

	/* Matches smp_wmb() when setting irqchip_mode */
	smp_rmb();
	return mode == KVM_IRQCHIP_KERNEL;
}
#else /* CONFIG_KVM_IOAPIC */
static __always_inline int irqchip_full(struct kvm *kvm)
{
	return false;
}
#endif

static inline int pic_in_kernel(struct kvm *kvm)
{
	return irqchip_full(kvm);
}


static inline int irqchip_split(struct kvm *kvm)
{
	int mode = kvm->arch.irqchip_mode;

	/* Matches smp_wmb() when setting irqchip_mode */
	smp_rmb();
	return mode == KVM_IRQCHIP_SPLIT;
}

static inline int irqchip_in_kernel(struct kvm *kvm)
{
	int mode = kvm->arch.irqchip_mode;

	/* Matches smp_wmb() when setting irqchip_mode */
	smp_rmb();
	return mode != KVM_IRQCHIP_NONE;
}

void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);

Annotation

Implementation Notes