irq_comm.c File Reference

#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/rculist.h>
#include <trace/events/kvm.h>
#include "irq.h"
#include "ioapic.h"
#include "lapic.h"
#include "hyperv.h"
#include "x86.h"
#include "xen.h"

Include dependency graph for irq_comm.c:

Go to the source code of this file.

Macros
#define	pr_fmt(fmt)   KBUILD_MODNAME ": " fmt
#define	IOAPIC_ROUTING_ENTRY(irq)
#define	ROUTING_ENTRY1(irq)   IOAPIC_ROUTING_ENTRY(irq)
#define	PIC_ROUTING_ENTRY(irq)
#define	ROUTING_ENTRY2(irq)    IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)

Functions
static int	kvm_set_pic_irq (struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status)
static int	kvm_set_ioapic_irq (struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status)
int	kvm_irq_delivery_to_apic (struct kvm *kvm, struct kvm_lapic *src, struct kvm_lapic_irq *irq, struct dest_map *dest_map)
void	kvm_set_msi_irq (struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, struct kvm_lapic_irq *irq)
	EXPORT_SYMBOL_GPL (kvm_set_msi_irq)
static bool	kvm_msi_route_invalid (struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e)
int	kvm_set_msi (struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status)
int	kvm_arch_set_irq_inatomic (struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status)
int	kvm_request_irq_source_id (struct kvm *kvm)
void	kvm_free_irq_source_id (struct kvm *kvm, int irq_source_id)
void	kvm_register_irq_mask_notifier (struct kvm *kvm, int irq, struct kvm_irq_mask_notifier *kimn)
void	kvm_unregister_irq_mask_notifier (struct kvm *kvm, int irq, struct kvm_irq_mask_notifier *kimn)
void	kvm_fire_mask_notifiers (struct kvm *kvm, unsigned irqchip, unsigned pin, bool mask)
bool	kvm_arch_can_set_irq_routing (struct kvm *kvm)
int	kvm_set_routing_entry (struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, const struct kvm_irq_routing_entry *ue)
bool	kvm_intr_is_single_vcpu (struct kvm *kvm, struct kvm_lapic_irq *irq, struct kvm_vcpu **dest_vcpu)
	EXPORT_SYMBOL_GPL (kvm_intr_is_single_vcpu)
int	kvm_setup_default_irq_routing (struct kvm *kvm)
int	kvm_setup_empty_irq_routing (struct kvm *kvm)
void	kvm_arch_post_irq_routing_update (struct kvm *kvm)
void	kvm_scan_ioapic_routes (struct kvm_vcpu *vcpu, ulong *ioapic_handled_vectors)
void	kvm_arch_irq_routing_update (struct kvm *kvm)

Variables
static const struct kvm_irq_routing_entry	default_routing []
static const struct kvm_irq_routing_entry	empty_routing [] = {}

Macro Definition Documentation

IOAPIC_ROUTING_ENTRY

#define IOAPIC_ROUTING_ENTRY

(

irq

)

Value:

    { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
      .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } }

Definition at line 366 of file irq_comm.c.

PIC_ROUTING_ENTRY

#define PIC_ROUTING_ENTRY

(

irq

)

Value:

    { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP,  \
      .u.irqchip = { .irqchip = SELECT_PIC(irq), .pin = (irq) % 8 } }

Definition at line 371 of file irq_comm.c.

pr_fmt

#define pr_fmt

(

fmt

)

KBUILD_MODNAME ": " fmt

Definition at line 11 of file irq_comm.c.

ROUTING_ENTRY1

#define ROUTING_ENTRY1

(

irq

)

IOAPIC_ROUTING_ENTRY(irq)

Definition at line 369 of file irq_comm.c.

ROUTING_ENTRY2

#define ROUTING_ENTRY2

(

irq

)

IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)

Definition at line 374 of file irq_comm.c.

Function Documentation

EXPORT_SYMBOL_GPL() [1/2]

EXPORT_SYMBOL_GPL

(

kvm_intr_is_single_vcpu

)

EXPORT_SYMBOL_GPL() [2/2]

EXPORT_SYMBOL_GPL

(

kvm_set_msi_irq

)

kvm_arch_can_set_irq_routing()

bool kvm_arch_can_set_irq_routing

(

struct kvm *

kvm

)

Definition at line 274 of file irq_comm.c.

{
    return irqchip_in_kernel(kvm);
}

kvm_arch_irq_routing_update()

void kvm_arch_irq_routing_update

(

struct kvm *

kvm

)

Definition at line 444 of file irq_comm.c.

{
#ifdef CONFIG_KVM_HYPERV
    kvm_hv_irq_routing_update(kvm);
#endif
}

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kvm_arch_post_irq_routing_update()

void kvm_arch_post_irq_routing_update

(

struct kvm *

kvm

)

Definition at line 405 of file irq_comm.c.

{
    if (!irqchip_split(kvm))
        return;
    kvm_make_scan_ioapic_request(kvm);
}

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kvm_arch_set_irq_inatomic()

int kvm_arch_set_irq_inatomic	(	struct kvm_kernel_irq_routing_entry *	e,
		struct kvm *	kvm,
		int	irq_source_id,
		int	level,
		bool	line_status
	)

Definition at line 159 of file irq_comm.c.

{
    struct kvm_lapic_irq irq;
    int r;
 
    switch (e->type) {
#ifdef CONFIG_KVM_HYPERV
    case KVM_IRQ_ROUTING_HV_SINT:
        return kvm_hv_set_sint(e, kvm, irq_source_id, level,
                       line_status);
#endif
 
    case KVM_IRQ_ROUTING_MSI:
        if (kvm_msi_route_invalid(kvm, e))
            return -EINVAL;
 
        kvm_set_msi_irq(kvm, e, &irq);
 
        if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL))
            return r;
        break;
 
#ifdef CONFIG_KVM_XEN
    case KVM_IRQ_ROUTING_XEN_EVTCHN:
        if (!level)
            return -1;
 
        return kvm_xen_set_evtchn_fast(&e->xen_evtchn, kvm);
#endif
    default:
        break;
    }
 
    return -EWOULDBLOCK;
}

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kvm_fire_mask_notifiers()

void kvm_fire_mask_notifiers	(	struct kvm *	kvm,
		unsigned	irqchip,
		unsigned	pin,
		bool	mask
	)

Definition at line 259 of file irq_comm.c.

{
    struct kvm_irq_mask_notifier *kimn;
    int idx, gsi;
 
    idx = srcu_read_lock(&kvm->irq_srcu);
    gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);
    if (gsi != -1)
        hlist_for_each_entry_rcu(kimn, &kvm->arch.mask_notifier_list, link)
            if (kimn->irq == gsi)
                kimn->func(kimn, mask);
    srcu_read_unlock(&kvm->irq_srcu, idx);
}

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kvm_free_irq_source_id()

void kvm_free_irq_source_id	(	struct kvm *	kvm,
		int	irq_source_id
	)

Definition at line 220 of file irq_comm.c.

{
    ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
    ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
 
    mutex_lock(&kvm->irq_lock);
    if (irq_source_id < 0 ||
        irq_source_id >= BITS_PER_LONG) {
        pr_err("IRQ source ID out of range!\n");
        goto unlock;
    }
    clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
    if (!irqchip_kernel(kvm))
        goto unlock;
 
    kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
    kvm_pic_clear_all(kvm->arch.vpic, irq_source_id);
unlock:
    mutex_unlock(&kvm->irq_lock);
}

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kvm_intr_is_single_vcpu()

bool kvm_intr_is_single_vcpu	(	struct kvm *	kvm,
		struct kvm_lapic_irq *	irq,
		struct kvm_vcpu **	dest_vcpu
	)

Definition at line 338 of file irq_comm.c.

{
    int r = 0;
    unsigned long i;
    struct kvm_vcpu *vcpu;
 
    if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu))
        return true;
 
    kvm_for_each_vcpu(i, vcpu, kvm) {
        if (!kvm_apic_present(vcpu))
            continue;
 
        if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
                    irq->dest_id, irq->dest_mode))
            continue;
 
        if (++r == 2)
            return false;
 
        *dest_vcpu = vcpu;
    }
 
    return r == 1;
}

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kvm_irq_delivery_to_apic()

int kvm_irq_delivery_to_apic	(	struct kvm *	kvm,
		struct kvm_lapic *	src,
		struct kvm_lapic_irq *	irq,
		struct dest_map *	dest_map
	)

Definition at line 47 of file irq_comm.c.

{
    int r = -1;
    struct kvm_vcpu *vcpu, *lowest = NULL;
    unsigned long i, dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)];
    unsigned int dest_vcpus = 0;
 
    if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
        return r;
 
    if (irq->dest_mode == APIC_DEST_PHYSICAL &&
        irq->dest_id == 0xff && kvm_lowest_prio_delivery(irq)) {
        pr_info("apic: phys broadcast and lowest prio\n");
        irq->delivery_mode = APIC_DM_FIXED;
    }
 
    memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap));
 
    kvm_for_each_vcpu(i, vcpu, kvm) {
        if (!kvm_apic_present(vcpu))
            continue;
 
        if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
                    irq->dest_id, irq->dest_mode))
            continue;
 
        if (!kvm_lowest_prio_delivery(irq)) {
            if (r < 0)
                r = 0;
            r += kvm_apic_set_irq(vcpu, irq, dest_map);
        } else if (kvm_apic_sw_enabled(vcpu->arch.apic)) {
            if (!kvm_vector_hashing_enabled()) {
                if (!lowest)
                    lowest = vcpu;
                else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
                    lowest = vcpu;
            } else {
                __set_bit(i, dest_vcpu_bitmap);
                dest_vcpus++;
            }
        }
    }
 
    if (dest_vcpus != 0) {
        int idx = kvm_vector_to_index(irq->vector, dest_vcpus,
                    dest_vcpu_bitmap, KVM_MAX_VCPUS);
 
        lowest = kvm_get_vcpu(kvm, idx);
    }
 
    if (lowest)
        r = kvm_apic_set_irq(lowest, irq, dest_map);
 
    return r;
}

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kvm_msi_route_invalid()

static bool kvm_msi_route_invalid ( struct kvm *  kvm, struct kvm_kernel_irq_routing_entry *  e  )

inlinestatic

Definition at line 125 of file irq_comm.c.

{
    return kvm->arch.x2apic_format && (e->msi.address_hi & 0xff);
}

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kvm_register_irq_mask_notifier()

void kvm_register_irq_mask_notifier	(	struct kvm *	kvm,
		int	irq,
		struct kvm_irq_mask_notifier *	kimn
	)

Definition at line 241 of file irq_comm.c.

{
    mutex_lock(&kvm->irq_lock);
    kimn->irq = irq;
    hlist_add_head_rcu(&kimn->link, &kvm->arch.mask_notifier_list);
    mutex_unlock(&kvm->irq_lock);
}

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kvm_request_irq_source_id()

int kvm_request_irq_source_id

(

struct kvm *

kvm

)

Definition at line 197 of file irq_comm.c.

{
    unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
    int irq_source_id;
 
    mutex_lock(&kvm->irq_lock);
    irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
 
    if (irq_source_id >= BITS_PER_LONG) {
        pr_warn("exhausted allocatable IRQ sources!\n");
        irq_source_id = -EFAULT;
        goto unlock;
    }
 
    ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
    ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
    set_bit(irq_source_id, bitmap);
unlock:
    mutex_unlock(&kvm->irq_lock);
 
    return irq_source_id;
}

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kvm_scan_ioapic_routes()

void kvm_scan_ioapic_routes	(	struct kvm_vcpu *	vcpu,
		ulong *	ioapic_handled_vectors
	)

Definition at line 412 of file irq_comm.c.

{
    struct kvm *kvm = vcpu->kvm;
    struct kvm_kernel_irq_routing_entry *entry;
    struct kvm_irq_routing_table *table;
    u32 i, nr_ioapic_pins;
    int idx;
 
    idx = srcu_read_lock(&kvm->irq_srcu);
    table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
    nr_ioapic_pins = min_t(u32, table->nr_rt_entries,
                   kvm->arch.nr_reserved_ioapic_pins);
    for (i = 0; i < nr_ioapic_pins; ++i) {
        hlist_for_each_entry(entry, &table->map[i], link) {
            struct kvm_lapic_irq irq;
 
            if (entry->type != KVM_IRQ_ROUTING_MSI)
                continue;
 
            kvm_set_msi_irq(vcpu->kvm, entry, &irq);
 
            if (irq.trig_mode &&
                (kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
                         irq.dest_id, irq.dest_mode) ||
                 kvm_apic_pending_eoi(vcpu, irq.vector)))
                __set_bit(irq.vector, ioapic_handled_vectors);
        }
    }
    srcu_read_unlock(&kvm->irq_srcu, idx);
}

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kvm_set_ioapic_irq()

static int kvm_set_ioapic_irq ( struct kvm_kernel_irq_routing_entry *  e, struct kvm *  kvm, int  irq_source_id, int  level, bool  line_status  )

static

Definition at line 38 of file irq_comm.c.

{
    struct kvm_ioapic *ioapic = kvm->arch.vioapic;
    return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
                line_status);
}

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kvm_set_msi()

int kvm_set_msi	(	struct kvm_kernel_irq_routing_entry *	e,
		struct kvm *	kvm,
		int	irq_source_id,
		int	level,
		bool	line_status
	)

Definition at line 131 of file irq_comm.c.

{
    struct kvm_lapic_irq irq;
 
    if (kvm_msi_route_invalid(kvm, e))
        return -EINVAL;
 
    if (!level)
        return -1;
 
    kvm_set_msi_irq(kvm, e, &irq);
 
    return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
}

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kvm_set_msi_irq()

void kvm_set_msi_irq	(	struct kvm *	kvm,
		struct kvm_kernel_irq_routing_entry *	e,
		struct kvm_lapic_irq *	irq
	)

Definition at line 104 of file irq_comm.c.

{
    struct msi_msg msg = { .address_lo = e->msi.address_lo,
                   .address_hi = e->msi.address_hi,
                   .data = e->msi.data };
 
    trace_kvm_msi_set_irq(msg.address_lo | (kvm->arch.x2apic_format ?
                  (u64)msg.address_hi << 32 : 0), msg.data);
 
    irq->dest_id = x86_msi_msg_get_destid(&msg, kvm->arch.x2apic_format);
    irq->vector = msg.arch_data.vector;
    irq->dest_mode = kvm_lapic_irq_dest_mode(msg.arch_addr_lo.dest_mode_logical);
    irq->trig_mode = msg.arch_data.is_level;
    irq->delivery_mode = msg.arch_data.delivery_mode << 8;
    irq->msi_redir_hint = msg.arch_addr_lo.redirect_hint;
    irq->level = 1;
    irq->shorthand = APIC_DEST_NOSHORT;
}

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kvm_set_pic_irq()

static int kvm_set_pic_irq ( struct kvm_kernel_irq_routing_entry *  e, struct kvm *  kvm, int  irq_source_id, int  level, bool  line_status  )

static

Definition at line 30 of file irq_comm.c.

{
    struct kvm_pic *pic = kvm->arch.vpic;
    return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
}

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kvm_set_routing_entry()

int kvm_set_routing_entry	(	struct kvm *	kvm,
		struct kvm_kernel_irq_routing_entry *	e,
		const struct kvm_irq_routing_entry *	ue
	)

Definition at line 279 of file irq_comm.c.

{
    /* We can't check irqchip_in_kernel() here as some callers are
     * currently initializing the irqchip. Other callers should therefore
     * check kvm_arch_can_set_irq_routing() before calling this function.
     */
    switch (ue->type) {
    case KVM_IRQ_ROUTING_IRQCHIP:
        if (irqchip_split(kvm))
            return -EINVAL;
        e->irqchip.pin = ue->u.irqchip.pin;
        switch (ue->u.irqchip.irqchip) {
        case KVM_IRQCHIP_PIC_SLAVE:
            e->irqchip.pin += PIC_NUM_PINS / 2;
            fallthrough;
        case KVM_IRQCHIP_PIC_MASTER:
            if (ue->u.irqchip.pin >= PIC_NUM_PINS / 2)
                return -EINVAL;
            e->set = kvm_set_pic_irq;
            break;
        case KVM_IRQCHIP_IOAPIC:
            if (ue->u.irqchip.pin >= KVM_IOAPIC_NUM_PINS)
                return -EINVAL;
            e->set = kvm_set_ioapic_irq;
            break;
        default:
            return -EINVAL;
        }
        e->irqchip.irqchip = ue->u.irqchip.irqchip;
        break;
    case KVM_IRQ_ROUTING_MSI:
        e->set = kvm_set_msi;
        e->msi.address_lo = ue->u.msi.address_lo;
        e->msi.address_hi = ue->u.msi.address_hi;
        e->msi.data = ue->u.msi.data;
 
        if (kvm_msi_route_invalid(kvm, e))
            return -EINVAL;
        break;
#ifdef CONFIG_KVM_HYPERV
    case KVM_IRQ_ROUTING_HV_SINT:
        e->set = kvm_hv_set_sint;
        e->hv_sint.vcpu = ue->u.hv_sint.vcpu;
        e->hv_sint.sint = ue->u.hv_sint.sint;
        break;
#endif
#ifdef CONFIG_KVM_XEN
    case KVM_IRQ_ROUTING_XEN_EVTCHN:
        return kvm_xen_setup_evtchn(kvm, e, ue);
#endif
    default:
        return -EINVAL;
    }
 
    return 0;
}

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kvm_setup_default_irq_routing()

int kvm_setup_default_irq_routing

(

struct kvm *

kvm

)

Definition at line 392 of file irq_comm.c.

{
    return kvm_set_irq_routing(kvm, default_routing,
                   ARRAY_SIZE(default_routing), 0);
}

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kvm_setup_empty_irq_routing()

int kvm_setup_empty_irq_routing

(

struct kvm *

kvm

)

Definition at line 400 of file irq_comm.c.

{
    return kvm_set_irq_routing(kvm, empty_routing, 0, 0);
}

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kvm_unregister_irq_mask_notifier()

void kvm_unregister_irq_mask_notifier	(	struct kvm *	kvm,
		int	irq,
		struct kvm_irq_mask_notifier *	kimn
	)

Definition at line 250 of file irq_comm.c.

{
    mutex_lock(&kvm->irq_lock);
    hlist_del_rcu(&kimn->link);
    mutex_unlock(&kvm->irq_lock);
    synchronize_srcu(&kvm->irq_srcu);
}

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Variable Documentation

default_routing

const struct kvm_irq_routing_entry default_routing[]

static

Initial value:

= {
    ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
    ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
    ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
    ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
    ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
    ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
    ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
    ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
    ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
    ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
    ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
    ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
}

Definition at line 364 of file irq_comm.c.

empty_routing

const struct kvm_irq_routing_entry empty_routing[] = {}

static

Definition at line 392 of file irq_comm.c.