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/*
* 8253/8254 interval timer emulation
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2006 Intel Corporation
* Copyright (c) 2007 Keir Fraser, XenSource Inc
* Copyright (c) 2008 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* Authors:
* Sheng Yang <sheng.yang@intel.com>
* Based on QEMU and Xen.
*
* This has been ported to illumos by Joyent.
* Copyright 2011 Joyent, Inc. All rights reserved.
*/
/*
* XXX Need proper header files!
*/
#include "msr.h"
#include "irqflags.h"
#include "kvm_host.h"
#include "kvm_x86host.h"
#include "iodev.h"
#include "kvm.h"
#include "irq.h"
extern int kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu);
int
pit_has_pending_timer(struct kvm_vcpu *vcpu)
{
struct kvm_pit *pit = vcpu->kvm->arch.vpit;
#ifdef XXX
if (pit && kvm_vcpu_is_bsp(vcpu) && pit->pit_state.irq_ack)
return (atomic_read(&pit->pit_state.pit_timer.pending));
#else
XXX_KVM_SYNC_PROBE;
if (pit && kvm_vcpu_is_bsp(vcpu) && pit->pit_state.irq_ack)
return (pit->pit_state.pit_timer.pending);
#endif
return (0);
}
static void
__inject_pit_timer_intr(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
int i;
kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1);
kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0);
/*
* Provides NMI watchdog support via Virtual Wire mode.
* The route is: PIT -> PIC -> LVT0 in NMI mode.
*
* Note: Our Virtual Wire implementation is simplified, only
* propagating PIT interrupts to all VCPUs when they have set
* LVT0 to NMI delivery. Other PIC interrupts are just sent to
* VCPU0, and only if its LVT0 is in EXTINT mode.
*/
if (kvm->arch.vapics_in_nmi_mode > 0)
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_apic_nmi_wd_deliver(vcpu);
}
void
kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu)
{
struct kvm_pit *pit = vcpu->kvm->arch.vpit;
struct kvm *kvm = vcpu->kvm;
struct kvm_kpit_state *ps;
if (pit) {
int inject = 0;
ps = &pit->pit_state;
/*
* Try to inject pending interrupts when
* last one has been acked.
*/
#ifdef XXX
raw_spin_lock(&ps->inject_lock);
if (atomic_read(&ps->pit_timer.pending) && ps->irq_ack) {
ps->irq_ack = 0;
inject = 1;
}
raw_spin_unlock(&ps->inject_lock);
#else
XXX_KVM_SYNC_PROBE;
mutex_enter(&ps->inject_lock);
if (&ps->pit_timer.pending && ps->irq_ack) {
ps->irq_ack = 0;
inject = 1;
}
mutex_exit(&ps->inject_lock);
#endif
if (inject)
__inject_pit_timer_intr(kvm);
}
}
void
kvm_free_pit(struct kvm *kvmp)
{
struct kvm_timer *kptp;
if (kvmp->arch.vpit == NULL)
return;
mutex_enter(&kvmp->arch.vpit->pit_state.lock);
kvm_unregister_irq_mask_notifier(kvmp, 0,
&kvmp->arch.vpit->mask_notifier);
kvm_unregister_irq_ack_notifier(kvmp,
&kvmp->arch.vpit->pit_state.irq_ack_notifier);
mutex_exit(&kvmp->arch.vpit->pit_state.lock);
mutex_enter(&cpu_lock);
kptp = &kvmp->arch.vpit->pit_state.pit_timer;
if (kptp->active)
cyclic_remove(kptp->kvm_cyclic_id);
mutex_exit(&cpu_lock);
mutex_destroy(&kvmp->arch.vpit->pit_state.lock);
kvm_free_irq_source_id(kvmp, kvmp->arch.vpit->irq_source_id);
kmem_free(kvmp->arch.vpit, sizeof (struct kvm_pit));
kvmp->arch.vpit = NULL;
}
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