2f5997140f
Migrate the PIT timer to the physical CPU which vcpu0 is scheduled on, similarly to what is done for the LAPIC timers, otherwise PIT interrupts will be delayed until an unrelated event causes an exit. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
103 lines
2.4 KiB
C
103 lines
2.4 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 <linux/kvm_host.h>
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#include "irq.h"
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#include "i8254.h"
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/*
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* check if there are pending timer events
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* to be processed.
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*/
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int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
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{
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int ret;
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ret = pit_has_pending_timer(vcpu);
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ret |= apic_has_pending_timer(vcpu);
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return ret;
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}
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EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
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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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if (kvm_apic_accept_pic_intr(v)) {
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s = pic_irqchip(v->kvm); /* PIC */
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return s->output;
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} else
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return 0;
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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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if (kvm_apic_accept_pic_intr(v)) {
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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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}
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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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void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
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{
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kvm_inject_apic_timer_irqs(vcpu);
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kvm_inject_pit_timer_irqs(vcpu);
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/* TODO: PIT, RTC etc. */
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}
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EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
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void kvm_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
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{
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kvm_apic_timer_intr_post(vcpu, vec);
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kvm_pit_timer_intr_post(vcpu, vec);
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/* TODO: PIT, RTC etc. */
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}
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EXPORT_SYMBOL_GPL(kvm_timer_intr_post);
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void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
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{
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__kvm_migrate_apic_timer(vcpu);
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__kvm_migrate_pit_timer(vcpu);
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}
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