linux/virt/kvm/irqchip.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * irqchip.c: Common API for in kernel interrupt controllers
 * Copyright (c) 2007, Intel Corporation.
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 * Copyright (c) 2013, Alexander Graf <[email protected]>
 *
 * This file is derived from virt/kvm/irq_comm.c.
 *
 * Authors:
 *   Yaozu (Eddie) Dong <[email protected]>
 *   Alexander Graf <[email protected]>
 */

#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/srcu.h>
#include <linux/export.h>
#include <trace/events/kvm.h>

int kvm_irq_map_gsi(struct kvm *kvm,
		    struct kvm_kernel_irq_routing_entry *entries, int gsi)
{ … }

int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
{ … }

int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
{ … }

/*
 * Return value:
 *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
 *  = 0   Interrupt was coalesced (previous irq is still pending)
 *  > 0   Number of CPUs interrupt was delivered to
 */
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
		bool line_status)
{ … }

static void free_irq_routing_table(struct kvm_irq_routing_table *rt)
{ … }

void kvm_free_irq_routing(struct kvm *kvm)
{ … }

static int setup_routing_entry(struct kvm *kvm,
			       struct kvm_irq_routing_table *rt,
			       struct kvm_kernel_irq_routing_entry *e,
			       const struct kvm_irq_routing_entry *ue)
{ … }

void __attribute__((weak)) kvm_arch_irq_routing_update(struct kvm *kvm)
{ … }

bool __weak kvm_arch_can_set_irq_routing(struct kvm *kvm)
{ … }

int kvm_set_irq_routing(struct kvm *kvm,
			const struct kvm_irq_routing_entry *ue,
			unsigned nr,
			unsigned flags)
{ … }

/*
 * Allocate empty IRQ routing by default so that additional setup isn't needed
 * when userspace-driven IRQ routing is activated, and so that kvm->irq_routing
 * is guaranteed to be non-NULL.
 */
int kvm_init_irq_routing(struct kvm *kvm)
{ … }