3f353858c9
While most accesses to the i8259 are with the kvm mutex taken, the call to kvm_pic_read_irq() is not. We can't easily take the kvm mutex there since the function is called with interrupts disabled. Fix by adding a spinlock to the virtual interrupt controller. Since we can't send an IPI under the spinlock (we also take the same spinlock in an irq disabled context), we defer the IPI until the spinlock is released. Similarly, we defer irq ack notifications until after spinlock release to avoid lock recursion. Signed-off-by: Avi Kivity <avi@redhat.com>
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*
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* irq.h: in kernel interrupt controller related definitions
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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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#ifndef __IRQ_H
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#define __IRQ_H
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#include <linux/mm_types.h>
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#include <linux/hrtimer.h>
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#include <linux/kvm_host.h>
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#include <linux/spinlock.h>
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#include "iodev.h"
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#include "ioapic.h"
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#include "lapic.h"
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#define PIC_NUM_PINS 16
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struct kvm;
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struct kvm_vcpu;
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typedef void irq_request_func(void *opaque, int level);
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struct kvm_kpic_state {
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u8 last_irr; /* edge detection */
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u8 irr; /* interrupt request register */
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u8 imr; /* interrupt mask register */
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u8 isr; /* interrupt service register */
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u8 isr_ack; /* interrupt ack detection */
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u8 priority_add; /* highest irq priority */
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u8 irq_base;
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u8 read_reg_select;
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u8 poll;
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u8 special_mask;
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u8 init_state;
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u8 auto_eoi;
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u8 rotate_on_auto_eoi;
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u8 special_fully_nested_mode;
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u8 init4; /* true if 4 byte init */
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u8 elcr; /* PIIX edge/trigger selection */
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u8 elcr_mask;
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struct kvm_pic *pics_state;
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};
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struct kvm_pic {
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spinlock_t lock;
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bool wakeup_needed;
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unsigned pending_acks;
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struct kvm *kvm;
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struct kvm_kpic_state pics[2]; /* 0 is master pic, 1 is slave pic */
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irq_request_func *irq_request;
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void *irq_request_opaque;
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int output; /* intr from master PIC */
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struct kvm_io_device dev;
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void (*ack_notifier)(void *opaque, int irq);
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};
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struct kvm_pic *kvm_create_pic(struct kvm *kvm);
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int kvm_pic_read_irq(struct kvm *kvm);
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void kvm_pic_update_irq(struct kvm_pic *s);
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void kvm_pic_clear_isr_ack(struct kvm *kvm);
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static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
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{
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return kvm->arch.vpic;
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}
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static inline int irqchip_in_kernel(struct kvm *kvm)
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{
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return pic_irqchip(kvm) != NULL;
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}
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void kvm_pic_reset(struct kvm_kpic_state *s);
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void kvm_timer_intr_post(struct kvm_vcpu *vcpu, int vec);
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void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu);
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void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu);
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void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu);
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void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu);
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void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu);
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void __kvm_migrate_timers(struct kvm_vcpu *vcpu);
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int pit_has_pending_timer(struct kvm_vcpu *vcpu);
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int apic_has_pending_timer(struct kvm_vcpu *vcpu);
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#endif
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