97222cc831
Because lightweight exits (exits which don't involve userspace) are many times faster than heavyweight exits, it makes sense to emulate high usage devices in the kernel. The local APIC is one such device, especially for Windows and for SMP, so we add an APIC model to kvm. It also allows in-kernel host-side drivers to inject interrupts without going through userspace. [compile fix on i386 from Jindrich Makovicka] Signed-off-by: Yaozu (Eddie) Dong <Eddie.Dong@intel.com> Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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* irq.c: 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/module.h>
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#include "kvm.h"
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#include "irq.h"
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/*
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* check if there is pending interrupt without
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* intack.
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*/
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int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
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{
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struct kvm_pic *s;
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if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */
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s = pic_irqchip(v->kvm); /* PIC */
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return s->output;
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}
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return 1;
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}
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EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
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/*
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* Read pending interrupt vector and intack.
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*/
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int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
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{
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struct kvm_pic *s;
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int vector;
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vector = kvm_get_apic_interrupt(v); /* APIC */
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if (vector == -1) {
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s = pic_irqchip(v->kvm);
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s->output = 0; /* PIC */
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vector = kvm_pic_read_irq(s);
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}
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return vector;
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}
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EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
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static void vcpu_kick_intr(void *info)
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{
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#ifdef DEBUG
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struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
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printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
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#endif
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}
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void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
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{
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int ipi_pcpu = vcpu->cpu;
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if (vcpu->guest_mode)
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smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
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}
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void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
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{
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/* TODO: for kernel IOAPIC */
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}
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