diff options
Diffstat (limited to 'virt/kvm/ioapic.c')
| -rw-r--r-- | virt/kvm/ioapic.c | 682 |
1 files changed, 0 insertions, 682 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c deleted file mode 100644 index f0f7ef82b7a6..000000000000 --- a/virt/kvm/ioapic.c +++ /dev/null @@ -1,682 +0,0 @@ -/* - * Copyright (C) 2001 MandrakeSoft S.A. - * Copyright 2010 Red Hat, Inc. and/or its affiliates. - * - * MandrakeSoft S.A. - * 43, rue d'Aboukir - * 75002 Paris - France - * http://www.linux-mandrake.com/ - * http://www.mandrakesoft.com/ - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Yunhong Jiang <yunhong.jiang@intel.com> - * Yaozu (Eddie) Dong <eddie.dong@intel.com> - * Based on Xen 3.1 code. - */ - -#include <linux/kvm_host.h> -#include <linux/kvm.h> -#include <linux/mm.h> -#include <linux/highmem.h> -#include <linux/smp.h> -#include <linux/hrtimer.h> -#include <linux/io.h> -#include <linux/slab.h> -#include <linux/export.h> -#include <asm/processor.h> -#include <asm/page.h> -#include <asm/current.h> -#include <trace/events/kvm.h> - -#include "ioapic.h" -#include "lapic.h" -#include "irq.h" - -#if 0 -#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) -#else -#define ioapic_debug(fmt, arg...) -#endif -static int ioapic_service(struct kvm_ioapic *vioapic, int irq, - bool line_status); - -static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic, - unsigned long addr, - unsigned long length) -{ - unsigned long result = 0; - - switch (ioapic->ioregsel) { - case IOAPIC_REG_VERSION: - result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16) - | (IOAPIC_VERSION_ID & 0xff)); - break; - - case IOAPIC_REG_APIC_ID: - case IOAPIC_REG_ARB_ID: - result = ((ioapic->id & 0xf) << 24); - break; - - default: - { - u32 redir_index = (ioapic->ioregsel - 0x10) >> 1; - u64 redir_content; - - if (redir_index < IOAPIC_NUM_PINS) - redir_content = - ioapic->redirtbl[redir_index].bits; - else - redir_content = ~0ULL; - - result = (ioapic->ioregsel & 0x1) ? - (redir_content >> 32) & 0xffffffff : - redir_content & 0xffffffff; - break; - } - } - - return result; -} - -static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic) -{ - ioapic->rtc_status.pending_eoi = 0; - bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS); -} - -static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic); - -static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic) -{ - if (WARN_ON(ioapic->rtc_status.pending_eoi < 0)) - kvm_rtc_eoi_tracking_restore_all(ioapic); -} - -static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) -{ - bool new_val, old_val; - struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; - union kvm_ioapic_redirect_entry *e; - - e = &ioapic->redirtbl[RTC_GSI]; - if (!kvm_apic_match_dest(vcpu, NULL, 0, e->fields.dest_id, - e->fields.dest_mode)) - return; - - new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector); - old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); - - if (new_val == old_val) - return; - - if (new_val) { - __set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); - ioapic->rtc_status.pending_eoi++; - } else { - __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); - ioapic->rtc_status.pending_eoi--; - rtc_status_pending_eoi_check_valid(ioapic); - } -} - -void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) -{ - struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; - - spin_lock(&ioapic->lock); - __rtc_irq_eoi_tracking_restore_one(vcpu); - spin_unlock(&ioapic->lock); -} - -static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic) -{ - struct kvm_vcpu *vcpu; - int i; - - if (RTC_GSI >= IOAPIC_NUM_PINS) - return; - - rtc_irq_eoi_tracking_reset(ioapic); - kvm_for_each_vcpu(i, vcpu, ioapic->kvm) - __rtc_irq_eoi_tracking_restore_one(vcpu); -} - -static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu) -{ - if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) { - --ioapic->rtc_status.pending_eoi; - rtc_status_pending_eoi_check_valid(ioapic); - } -} - -static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic) -{ - if (ioapic->rtc_status.pending_eoi > 0) - return true; /* coalesced */ - - return false; -} - -static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq, - int irq_level, bool line_status) -{ - union kvm_ioapic_redirect_entry entry; - u32 mask = 1 << irq; - u32 old_irr; - int edge, ret; - - entry = ioapic->redirtbl[irq]; - edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG); - - if (!irq_level) { - ioapic->irr &= ~mask; - ret = 1; - goto out; - } - - /* - * Return 0 for coalesced interrupts; for edge-triggered interrupts, - * this only happens if a previous edge has not been delivered due - * do masking. For level interrupts, the remote_irr field tells - * us if the interrupt is waiting for an EOI. - * - * RTC is special: it is edge-triggered, but userspace likes to know - * if it has been already ack-ed via EOI because coalesced RTC - * interrupts lead to time drift in Windows guests. So we track - * EOI manually for the RTC interrupt. - */ - if (irq == RTC_GSI && line_status && - rtc_irq_check_coalesced(ioapic)) { - ret = 0; - goto out; - } - - old_irr = ioapic->irr; - ioapic->irr |= mask; - if ((edge && old_irr == ioapic->irr) || - (!edge && entry.fields.remote_irr)) { - ret = 0; - goto out; - } - - ret = ioapic_service(ioapic, irq, line_status); - -out: - trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); - return ret; -} - -static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr) -{ - u32 idx; - - rtc_irq_eoi_tracking_reset(ioapic); - for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS) - ioapic_set_irq(ioapic, idx, 1, true); - - kvm_rtc_eoi_tracking_restore_all(ioapic); -} - - -static void update_handled_vectors(struct kvm_ioapic *ioapic) -{ - DECLARE_BITMAP(handled_vectors, 256); - int i; - - memset(handled_vectors, 0, sizeof(handled_vectors)); - for (i = 0; i < IOAPIC_NUM_PINS; ++i) - __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors); - memcpy(ioapic->handled_vectors, handled_vectors, - sizeof(handled_vectors)); - smp_wmb(); -} - -void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap, - u32 *tmr) -{ - struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; - union kvm_ioapic_redirect_entry *e; - int index; - - spin_lock(&ioapic->lock); - for (index = 0; index < IOAPIC_NUM_PINS; index++) { - e = &ioapic->redirtbl[index]; - if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG || - kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) || - index == RTC_GSI) { - if (kvm_apic_match_dest(vcpu, NULL, 0, - e->fields.dest_id, e->fields.dest_mode)) { - __set_bit(e->fields.vector, - (unsigned long *)eoi_exit_bitmap); - if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG) - __set_bit(e->fields.vector, - (unsigned long *)tmr); - } - } - } - spin_unlock(&ioapic->lock); -} - -#ifdef CONFIG_X86 -void kvm_vcpu_request_scan_ioapic(struct kvm *kvm) -{ - struct kvm_ioapic *ioapic = kvm->arch.vioapic; - - if (!ioapic) - return; - kvm_make_scan_ioapic_request(kvm); -} -#else -void kvm_vcpu_request_scan_ioapic(struct kvm *kvm) -{ - return; -} -#endif - -static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) -{ - unsigned index; - bool mask_before, mask_after; - union kvm_ioapic_redirect_entry *e; - - switch (ioapic->ioregsel) { - case IOAPIC_REG_VERSION: - /* Writes are ignored. */ - break; - - case IOAPIC_REG_APIC_ID: - ioapic->id = (val >> 24) & 0xf; - break; - - case IOAPIC_REG_ARB_ID: - break; - - default: - index = (ioapic->ioregsel - 0x10) >> 1; - - ioapic_debug("change redir index %x val %x\n", index, val); - if (index >= IOAPIC_NUM_PINS) - return; - e = &ioapic->redirtbl[index]; - mask_before = e->fields.mask; - if (ioapic->ioregsel & 1) { - e->bits &= 0xffffffff; - e->bits |= (u64) val << 32; - } else { - e->bits &= ~0xffffffffULL; - e->bits |= (u32) val; - e->fields.remote_irr = 0; - } - update_handled_vectors(ioapic); - mask_after = e->fields.mask; - if (mask_before != mask_after) - kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after); - if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG - && ioapic->irr & (1 << index)) - ioapic_service(ioapic, index, false); - kvm_vcpu_request_scan_ioapic(ioapic->kvm); - break; - } -} - -static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status) -{ - union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; - struct kvm_lapic_irq irqe; - int ret; - - if (entry->fields.mask) - return -1; - - ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x " - "vector=%x trig_mode=%x\n", - entry->fields.dest_id, entry->fields.dest_mode, - entry->fields.delivery_mode, entry->fields.vector, - entry->fields.trig_mode); - - irqe.dest_id = entry->fields.dest_id; - irqe.vector = entry->fields.vector; - irqe.dest_mode = entry->fields.dest_mode; - irqe.trig_mode = entry->fields.trig_mode; - irqe.delivery_mode = entry->fields.delivery_mode << 8; - irqe.level = 1; - irqe.shorthand = 0; - - if (irqe.trig_mode == IOAPIC_EDGE_TRIG) - ioapic->irr &= ~(1 << irq); - - if (irq == RTC_GSI && line_status) { - /* - * pending_eoi cannot ever become negative (see - * rtc_status_pending_eoi_check_valid) and the caller - * ensures that it is only called if it is >= zero, namely - * if rtc_irq_check_coalesced returns false). - */ - BUG_ON(ioapic->rtc_status.pending_eoi != 0); - ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, - ioapic->rtc_status.dest_map); - ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret); - } else - ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL); - - if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG) - entry->fields.remote_irr = 1; - - return ret; -} - -int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, - int level, bool line_status) -{ - int ret, irq_level; - - BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS); - - spin_lock(&ioapic->lock); - irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq], - irq_source_id, level); - ret = ioapic_set_irq(ioapic, irq, irq_level, line_status); - - spin_unlock(&ioapic->lock); - - return ret; -} - -void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id) -{ - int i; - - spin_lock(&ioapic->lock); - for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) - __clear_bit(irq_source_id, &ioapic->irq_states[i]); - spin_unlock(&ioapic->lock); -} - -static void kvm_ioapic_eoi_inject_work(struct work_struct *work) -{ - int i; - struct kvm_ioapic *ioapic = container_of(work, struct kvm_ioapic, - eoi_inject.work); - spin_lock(&ioapic->lock); - for (i = 0; i < IOAPIC_NUM_PINS; i++) { - union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; - - if (ent->fields.trig_mode != IOAPIC_LEVEL_TRIG) - continue; - - if (ioapic->irr & (1 << i) && !ent->fields.remote_irr) - ioapic_service(ioapic, i, false); - } - spin_unlock(&ioapic->lock); -} - -#define IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT 10000 - -static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, - struct kvm_ioapic *ioapic, int vector, int trigger_mode) -{ - int i; - - for (i = 0; i < IOAPIC_NUM_PINS; i++) { - union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; - - if (ent->fields.vector != vector) - continue; - - if (i == RTC_GSI) - rtc_irq_eoi(ioapic, vcpu); - /* - * We are dropping lock while calling ack notifiers because ack - * notifier callbacks for assigned devices call into IOAPIC - * recursively. Since remote_irr is cleared only after call - * to notifiers if the same vector will be delivered while lock - * is dropped it will be put into irr and will be delivered - * after ack notifier returns. - */ - spin_unlock(&ioapic->lock); - kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i); - spin_lock(&ioapic->lock); - - if (trigger_mode != IOAPIC_LEVEL_TRIG) - continue; - - ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG); - ent->fields.remote_irr = 0; - if (!ent->fields.mask && (ioapic->irr & (1 << i))) { - ++ioapic->irq_eoi[i]; - if (ioapic->irq_eoi[i] == IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT) { - /* - * Real hardware does not deliver the interrupt - * immediately during eoi broadcast, and this - * lets a buggy guest make slow progress - * even if it does not correctly handle a - * level-triggered interrupt. Emulate this - * behavior if we detect an interrupt storm. - */ - schedule_delayed_work(&ioapic->eoi_inject, HZ / 100); - ioapic->irq_eoi[i] = 0; - trace_kvm_ioapic_delayed_eoi_inj(ent->bits); - } else { - ioapic_service(ioapic, i, false); - } - } else { - ioapic->irq_eoi[i] = 0; - } - } -} - -bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector) -{ - struct kvm_ioapic *ioapic = kvm->arch.vioapic; - smp_rmb(); - return test_bit(vector, ioapic->handled_vectors); -} - -void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode) -{ - struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; - - spin_lock(&ioapic->lock); - __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode); - spin_unlock(&ioapic->lock); -} - -static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev) -{ - return container_of(dev, struct kvm_ioapic, dev); -} - -static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr) -{ - return ((addr >= ioapic->base_address && - (addr < ioapic->base_address + IOAPIC_MEM_LENGTH))); -} - -static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len, - void *val) -{ - struct kvm_ioapic *ioapic = to_ioapic(this); - u32 result; - if (!ioapic_in_range(ioapic, addr)) - return -EOPNOTSUPP; - - ioapic_debug("addr %lx\n", (unsigned long)addr); - ASSERT(!(addr & 0xf)); /* check alignment */ - - addr &= 0xff; - spin_lock(&ioapic->lock); - switch (addr) { - case IOAPIC_REG_SELECT: - result = ioapic->ioregsel; - break; - - case IOAPIC_REG_WINDOW: - result = ioapic_read_indirect(ioapic, addr, len); - break; - - default: - result = 0; - break; - } - spin_unlock(&ioapic->lock); - - switch (len) { - case 8: - *(u64 *) val = result; - break; - case 1: - case 2: - case 4: - memcpy(val, (char *)&result, len); - break; - default: - printk(KERN_WARNING "ioapic: wrong length %d\n", len); - } - return 0; -} - -static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len, - const void *val) -{ - struct kvm_ioapic *ioapic = to_ioapic(this); - u32 data; - if (!ioapic_in_range(ioapic, addr)) - return -EOPNOTSUPP; - - ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n", - (void*)addr, len, val); - ASSERT(!(addr & 0xf)); /* check alignment */ - - switch (len) { - case 8: - case 4: - data = *(u32 *) val; - break; - case 2: - data = *(u16 *) val; - break; - case 1: - data = *(u8 *) val; - break; - default: - printk(KERN_WARNING "ioapic: Unsupported size %d\n", len); - return 0; - } - - addr &= 0xff; - spin_lock(&ioapic->lock); - switch (addr) { - case IOAPIC_REG_SELECT: - ioapic->ioregsel = data & 0xFF; /* 8-bit register */ - break; - - case IOAPIC_REG_WINDOW: - ioapic_write_indirect(ioapic, data); - break; - - default: - break; - } - spin_unlock(&ioapic->lock); - return 0; -} - -static void kvm_ioapic_reset(struct kvm_ioapic *ioapic) -{ - int i; - - cancel_delayed_work_sync(&ioapic->eoi_inject); - for (i = 0; i < IOAPIC_NUM_PINS; i++) - ioapic->redirtbl[i].fields.mask = 1; - ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS; - ioapic->ioregsel = 0; - ioapic->irr = 0; - ioapic->id = 0; - memset(ioapic->irq_eoi, 0x00, IOAPIC_NUM_PINS); - rtc_irq_eoi_tracking_reset(ioapic); - update_handled_vectors(ioapic); -} - -static const struct kvm_io_device_ops ioapic_mmio_ops = { - .read = ioapic_mmio_read, - .write = ioapic_mmio_write, -}; - -int kvm_ioapic_init(struct kvm *kvm) -{ - struct kvm_ioapic *ioapic; - int ret; - - ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL); - if (!ioapic) - return -ENOMEM; - spin_lock_init(&ioapic->lock); - INIT_DELAYED_WORK(&ioapic->eoi_inject, kvm_ioapic_eoi_inject_work); - kvm->arch.vioapic = ioapic; - kvm_ioapic_reset(ioapic); - kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); - ioapic->kvm = kvm; - mutex_lock(&kvm->slots_lock); - ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address, - IOAPIC_MEM_LENGTH, &ioapic->dev); - mutex_unlock(&kvm->slots_lock); - if (ret < 0) { - kvm->arch.vioapic = NULL; - kfree(ioapic); - } - - return ret; -} - -void kvm_ioapic_destroy(struct kvm *kvm) -{ - struct kvm_ioapic *ioapic = kvm->arch.vioapic; - - cancel_delayed_work_sync(&ioapic->eoi_inject); - if (ioapic) { - kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev); - kvm->arch.vioapic = NULL; - kfree(ioapic); - } -} - -int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) -{ - struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); - if (!ioapic) - return -EINVAL; - - spin_lock(&ioapic->lock); - memcpy(state, ioapic, sizeof(struct kvm_ioapic_state)); - spin_unlock(&ioapic->lock); - return 0; -} - -int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) -{ - struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); - if (!ioapic) - return -EINVAL; - - spin_lock(&ioapic->lock); - memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); - ioapic->irr = 0; - update_handled_vectors(ioapic); - kvm_vcpu_request_scan_ioapic(kvm); - kvm_ioapic_inject_all(ioapic, state->irr); - spin_unlock(&ioapic->lock); - return 0; -} |