From d3c7b77d1a6e7a0a27035a7ba723a3455317883e Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Mon, 23 Feb 2009 10:57:41 -0300 Subject: KVM: unify part of generic timer handling Hide the internals of vcpu awakening / injection from the in-kernel emulated timers. This makes future changes in this logic easier and decreases the distance to more generic timer handling. Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/x86/kvm/lapic.c | 94 ++++++++++++++++++++++------------------------------ 1 file changed, 39 insertions(+), 55 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index afc59b2e7e0..27ca43e4e44 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -528,12 +528,13 @@ static u32 apic_get_tmcct(struct kvm_lapic *apic) if (apic_get_reg(apic, APIC_TMICT) == 0) return 0; - remaining = hrtimer_expires_remaining(&apic->timer.dev); + remaining = hrtimer_expires_remaining(&apic->lapic_timer.timer); if (ktime_to_ns(remaining) < 0) remaining = ktime_set(0, 0); - ns = mod_64(ktime_to_ns(remaining), apic->timer.period); - tmcct = div64_u64(ns, (APIC_BUS_CYCLE_NS * apic->timer.divide_count)); + ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period); + tmcct = div64_u64(ns, + (APIC_BUS_CYCLE_NS * apic->divide_count)); return tmcct; } @@ -620,25 +621,25 @@ static void update_divide_count(struct kvm_lapic *apic) tdcr = apic_get_reg(apic, APIC_TDCR); tmp1 = tdcr & 0xf; tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1; - apic->timer.divide_count = 0x1 << (tmp2 & 0x7); + apic->divide_count = 0x1 << (tmp2 & 0x7); apic_debug("timer divide count is 0x%x\n", - apic->timer.divide_count); + apic->lapic_timer.divide_count); } static void start_apic_timer(struct kvm_lapic *apic) { - ktime_t now = apic->timer.dev.base->get_time(); + ktime_t now = apic->lapic_timer.timer.base->get_time(); - apic->timer.period = apic_get_reg(apic, APIC_TMICT) * - APIC_BUS_CYCLE_NS * apic->timer.divide_count; - atomic_set(&apic->timer.pending, 0); + apic->lapic_timer.period = apic_get_reg(apic, APIC_TMICT) * + APIC_BUS_CYCLE_NS * apic->divide_count; + atomic_set(&apic->lapic_timer.pending, 0); - if (!apic->timer.period) + if (!apic->lapic_timer.period) return; - hrtimer_start(&apic->timer.dev, - ktime_add_ns(now, apic->timer.period), + hrtimer_start(&apic->lapic_timer.timer, + ktime_add_ns(now, apic->lapic_timer.period), HRTIMER_MODE_ABS); apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016" @@ -647,9 +648,9 @@ static void start_apic_timer(struct kvm_lapic *apic) "expire @ 0x%016" PRIx64 ".\n", __func__, APIC_BUS_CYCLE_NS, ktime_to_ns(now), apic_get_reg(apic, APIC_TMICT), - apic->timer.period, + apic->lapic_timer.period, ktime_to_ns(ktime_add_ns(now, - apic->timer.period))); + apic->lapic_timer.period))); } static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val) @@ -731,7 +732,7 @@ static void apic_mmio_write(struct kvm_io_device *this, apic_set_reg(apic, APIC_LVTT + 0x10 * i, lvt_val | APIC_LVT_MASKED); } - atomic_set(&apic->timer.pending, 0); + atomic_set(&apic->lapic_timer.pending, 0); } break; @@ -763,7 +764,7 @@ static void apic_mmio_write(struct kvm_io_device *this, break; case APIC_TMICT: - hrtimer_cancel(&apic->timer.dev); + hrtimer_cancel(&apic->lapic_timer.timer); apic_set_reg(apic, APIC_TMICT, val); start_apic_timer(apic); return; @@ -803,7 +804,7 @@ void kvm_free_lapic(struct kvm_vcpu *vcpu) if (!vcpu->arch.apic) return; - hrtimer_cancel(&vcpu->arch.apic->timer.dev); + hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer); if (vcpu->arch.apic->regs_page) __free_page(vcpu->arch.apic->regs_page); @@ -881,7 +882,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu) ASSERT(apic != NULL); /* Stop the timer in case it's a reset to an active apic */ - hrtimer_cancel(&apic->timer.dev); + hrtimer_cancel(&apic->lapic_timer.timer); apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24); apic_set_reg(apic, APIC_LVR, APIC_VERSION); @@ -906,7 +907,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu) apic_set_reg(apic, APIC_TMR + 0x10 * i, 0); } update_divide_count(apic); - atomic_set(&apic->timer.pending, 0); + atomic_set(&apic->lapic_timer.pending, 0); if (vcpu->vcpu_id == 0) vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP; apic_update_ppr(apic); @@ -937,22 +938,11 @@ EXPORT_SYMBOL_GPL(kvm_lapic_enabled); *---------------------------------------------------------------------- */ -/* TODO: make sure __apic_timer_fn runs in current pCPU */ -static int __apic_timer_fn(struct kvm_lapic *apic) +static bool lapic_is_periodic(struct kvm_timer *ktimer) { - int result = 0; - wait_queue_head_t *q = &apic->vcpu->wq; - - if(!atomic_inc_and_test(&apic->timer.pending)) - set_bit(KVM_REQ_PENDING_TIMER, &apic->vcpu->requests); - if (waitqueue_active(q)) - wake_up_interruptible(q); - - if (apic_lvtt_period(apic)) { - result = 1; - hrtimer_add_expires_ns(&apic->timer.dev, apic->timer.period); - } - return result; + struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, + lapic_timer); + return apic_lvtt_period(apic); } int apic_has_pending_timer(struct kvm_vcpu *vcpu) @@ -960,7 +950,7 @@ int apic_has_pending_timer(struct kvm_vcpu *vcpu) struct kvm_lapic *lapic = vcpu->arch.apic; if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT)) - return atomic_read(&lapic->timer.pending); + return atomic_read(&lapic->lapic_timer.pending); return 0; } @@ -987,20 +977,9 @@ void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu) kvm_apic_local_deliver(apic, APIC_LVT0); } -static enum hrtimer_restart apic_timer_fn(struct hrtimer *data) -{ - struct kvm_lapic *apic; - int restart_timer = 0; - - apic = container_of(data, struct kvm_lapic, timer.dev); - - restart_timer = __apic_timer_fn(apic); - - if (restart_timer) - return HRTIMER_RESTART; - else - return HRTIMER_NORESTART; -} +struct kvm_timer_ops lapic_timer_ops = { + .is_periodic = lapic_is_periodic, +}; int kvm_create_lapic(struct kvm_vcpu *vcpu) { @@ -1025,8 +1004,13 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu) memset(apic->regs, 0, PAGE_SIZE); apic->vcpu = vcpu; - hrtimer_init(&apic->timer.dev, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); - apic->timer.dev.function = apic_timer_fn; + hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, + HRTIMER_MODE_ABS); + apic->lapic_timer.timer.function = kvm_timer_fn; + apic->lapic_timer.t_ops = &lapic_timer_ops; + apic->lapic_timer.kvm = vcpu->kvm; + apic->lapic_timer.vcpu_id = vcpu->vcpu_id; + apic->base_address = APIC_DEFAULT_PHYS_BASE; vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE; @@ -1079,9 +1063,9 @@ void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; - if (apic && atomic_read(&apic->timer.pending) > 0) { + if (apic && atomic_read(&apic->lapic_timer.pending) > 0) { if (kvm_apic_local_deliver(apic, APIC_LVTT)) - atomic_dec(&apic->timer.pending); + atomic_dec(&apic->lapic_timer.pending); } } @@ -1107,7 +1091,7 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu) MSR_IA32_APICBASE_BASE; apic_set_reg(apic, APIC_LVR, APIC_VERSION); apic_update_ppr(apic); - hrtimer_cancel(&apic->timer.dev); + hrtimer_cancel(&apic->lapic_timer.timer); update_divide_count(apic); start_apic_timer(apic); } @@ -1120,7 +1104,7 @@ void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu) if (!apic) return; - timer = &apic->timer.dev; + timer = &apic->lapic_timer.timer; if (hrtimer_cancel(timer)) hrtimer_start_expires(timer, HRTIMER_MODE_ABS); } -- cgit v1.2.3