5550af4df1
Every call of kvm_set_irq() should offer an irq_source_id, which is
allocated by kvm_request_irq_source_id(). Based on irq_source_id, we
identify the irq source and implement logical OR for shared level
interrupts.
The allocated irq_source_id can be freed by kvm_free_irq_source_id().
Currently, we support at most sizeof(unsigned long) different irq sources.
[Amit: - rebase to kvm.git HEAD
- move definition of KVM_USERSPACE_IRQ_SOURCE_ID to common file
- move kvm_request_irq_source_id to the update_irq ioctl]
[Xiantao: - Add kvm/ia64 stuff and make it work for kvm/ia64 guests]
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* irq_comm.c: Common API for in kernel interrupt controller
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* Copyright (c) 2007, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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* Authors:
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* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
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*
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*/
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#include <linux/kvm_host.h>
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#include "irq.h"
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#include "ioapic.h"
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/* This should be called with the kvm->lock mutex held */
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void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
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{
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unsigned long *irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
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/* Logical OR for level trig interrupt */
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if (level)
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set_bit(irq_source_id, irq_state);
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else
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clear_bit(irq_source_id, irq_state);
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/* Not possible to detect if the guest uses the PIC or the
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* IOAPIC. So set the bit in both. The guest will ignore
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* writes to the unused one.
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*/
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kvm_ioapic_set_irq(kvm->arch.vioapic, irq, !!(*irq_state));
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#ifdef CONFIG_X86
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kvm_pic_set_irq(pic_irqchip(kvm), irq, !!(*irq_state));
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#endif
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}
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void kvm_notify_acked_irq(struct kvm *kvm, unsigned gsi)
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{
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struct kvm_irq_ack_notifier *kian;
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struct hlist_node *n;
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hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
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if (kian->gsi == gsi)
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kian->irq_acked(kian);
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}
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void kvm_register_irq_ack_notifier(struct kvm *kvm,
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struct kvm_irq_ack_notifier *kian)
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{
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hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
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}
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void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
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struct kvm_irq_ack_notifier *kian)
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{
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hlist_del(&kian->link);
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}
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/* The caller must hold kvm->lock mutex */
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int kvm_request_irq_source_id(struct kvm *kvm)
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{
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unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
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int irq_source_id = find_first_zero_bit(bitmap,
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sizeof(kvm->arch.irq_sources_bitmap));
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if (irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
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printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
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irq_source_id = -EFAULT;
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} else
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set_bit(irq_source_id, bitmap);
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return irq_source_id;
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}
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void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
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{
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int i;
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if (irq_source_id <= 0 ||
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irq_source_id >= sizeof(kvm->arch.irq_sources_bitmap)) {
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printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
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return;
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}
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for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
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clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
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clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
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}
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