/* * APIC support * * Copyright (c) 2004-2005 Fabrice Bellard * * 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 2.1 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, see */ #include "qemu/osdep.h" #include "qemu/thread.h" #include "hw/i386/apic_internal.h" #include "hw/i386/apic.h" #include "hw/intc/ioapic.h" #include "hw/intc/i8259.h" #include "hw/intc/kvm_irqcount.h" #include "hw/pci/msi.h" #include "qemu/host-utils.h" #include "sysemu/kvm.h" #include "trace.h" #include "hw/i386/apic-msidef.h" #include "qapi/error.h" #include "qom/object.h" #define MAX_APICS 255 #define MAX_APIC_WORDS 8 #define SYNC_FROM_VAPIC 0x1 #define SYNC_TO_VAPIC 0x2 #define SYNC_ISR_IRR_TO_VAPIC 0x4 static APICCommonState *local_apics[MAX_APICS + 1]; #define TYPE_APIC "apic" /*This is reusing the APICCommonState typedef from APIC_COMMON */ DECLARE_INSTANCE_CHECKER(APICCommonState, APIC, TYPE_APIC) static void apic_set_irq(APICCommonState *s, int vector_num, int trigger_mode); static void apic_update_irq(APICCommonState *s); static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask, uint8_t dest, uint8_t dest_mode); /* Find first bit starting from msb */ static int apic_fls_bit(uint32_t value) { return 31 - clz32(value); } /* Find first bit starting from lsb */ static int apic_ffs_bit(uint32_t value) { return ctz32(value); } static inline void apic_reset_bit(uint32_t *tab, int index) { int i, mask; i = index >> 5; mask = 1 << (index & 0x1f); tab[i] &= ~mask; } /* return -1 if no bit is set */ static int get_highest_priority_int(uint32_t *tab) { int i; for (i = 7; i >= 0; i--) { if (tab[i] != 0) { return i * 32 + apic_fls_bit(tab[i]); } } return -1; } static void apic_sync_vapic(APICCommonState *s, int sync_type) { VAPICState vapic_state; size_t length; off_t start; int vector; if (!s->vapic_paddr) { return; } if (sync_type & SYNC_FROM_VAPIC) { cpu_physical_memory_read(s->vapic_paddr, &vapic_state, sizeof(vapic_state)); s->tpr = vapic_state.tpr; } if (sync_type & (SYNC_TO_VAPIC | SYNC_ISR_IRR_TO_VAPIC)) { start = offsetof(VAPICState, isr); length = offsetof(VAPICState, enabled) - offsetof(VAPICState, isr); if (sync_type & SYNC_TO_VAPIC) { assert(qemu_cpu_is_self(CPU(s->cpu))); vapic_state.tpr = s->tpr; vapic_state.enabled = 1; start = 0; length = sizeof(VAPICState); } vector = get_highest_priority_int(s->isr); if (vector < 0) { vector = 0; } vapic_state.isr = vector & 0xf0; vapic_state.zero = 0; vector = get_highest_priority_int(s->irr); if (vector < 0) { vector = 0; } vapic_state.irr = vector & 0xff; address_space_write_rom(&address_space_memory, s->vapic_paddr + start, MEMTXATTRS_UNSPECIFIED, ((void *)&vapic_state) + start, length); } } static void apic_vapic_base_update(APICCommonState *s) { apic_sync_vapic(s, SYNC_TO_VAPIC); } static void apic_local_deliver(APICCommonState *s, int vector) { uint32_t lvt = s->lvt[vector]; int trigger_mode; trace_apic_local_deliver(vector, (lvt >> 8) & 7); if (lvt & APIC_LVT_MASKED) return; switch ((lvt >> 8) & 7) { case APIC_DM_SMI: cpu_interrupt(CPU(s->cpu), CPU_INTERRUPT_SMI); break; case APIC_DM_NMI: cpu_interrupt(CPU(s->cpu), CPU_INTERRUPT_NMI); break; case APIC_DM_EXTINT: cpu_interrupt(CPU(s->cpu), CPU_INTERRUPT_HARD); break; case APIC_DM_FIXED: trigger_mode = APIC_TRIGGER_EDGE; if ((vector == APIC_LVT_LINT0 || vector == APIC_LVT_LINT1) && (lvt & APIC_LVT_LEVEL_TRIGGER)) trigger_mode = APIC_TRIGGER_LEVEL; apic_set_irq(s, lvt & 0xff, trigger_mode); } } void apic_deliver_pic_intr(DeviceState *dev, int level) { APICCommonState *s = APIC(dev); if (level) { apic_local_deliver(s, APIC_LVT_LINT0); } else { uint32_t lvt = s->lvt[APIC_LVT_LINT0]; switch ((lvt >> 8) & 7) { case APIC_DM_FIXED: if (!(lvt & APIC_LVT_LEVEL_TRIGGER)) break; apic_reset_bit(s->irr, lvt & 0xff); /* fall through */ case APIC_DM_EXTINT: apic_update_irq(s); break; } } } static void apic_external_nmi(APICCommonState *s) { apic_local_deliver(s, APIC_LVT_LINT1); } #define foreach_apic(apic, deliver_bitmask, code) \ {\ int __i, __j;\ for(__i = 0; __i < MAX_APIC_WORDS; __i++) {\ uint32_t __mask = deliver_bitmask[__i];\ if (__mask) {\ for(__j = 0; __j < 32; __j++) {\ if (__mask & (1U << __j)) {\ apic = local_apics[__i * 32 + __j];\ if (apic) {\ code;\ }\ }\ }\ }\ }\ } static void apic_bus_deliver(const uint32_t *deliver_bitmask, uint8_t delivery_mode, uint8_t vector_num, uint8_t trigger_mode) { APICCommonState *apic_iter; switch (delivery_mode) { case APIC_DM_LOWPRI: /* XXX: search for focus processor, arbitration */ { int i, d; d = -1; for(i = 0; i < MAX_APIC_WORDS; i++) { if (deliver_bitmask[i]) { d = i * 32 + apic_ffs_bit(deliver_bitmask[i]); break; } } if (d >= 0) { apic_iter = local_apics[d]; if (apic_iter) { apic_set_irq(apic_iter, vector_num, trigger_mode); } } } return; case APIC_DM_FIXED: break; case APIC_DM_SMI: foreach_apic(apic_iter, deliver_bitmask, cpu_interrupt(CPU(apic_iter->cpu), CPU_INTERRUPT_SMI) ); return; case APIC_DM_NMI: foreach_apic(apic_iter, deliver_bitmask, cpu_interrupt(CPU(apic_iter->cpu), CPU_INTERRUPT_NMI) ); return; case APIC_DM_INIT: /* normal INIT IPI sent to processors */ foreach_apic(apic_iter, deliver_bitmask, cpu_interrupt(CPU(apic_iter->cpu), CPU_INTERRUPT_INIT) ); return; case APIC_DM_EXTINT: /* handled in I/O APIC code */ break; default: return; } foreach_apic(apic_iter, deliver_bitmask, apic_set_irq(apic_iter, vector_num, trigger_mode) ); } void apic_deliver_irq(uint8_t dest, uint8_t dest_mode, uint8_t delivery_mode, uint8_t vector_num, uint8_t trigger_mode) { uint32_t deliver_bitmask[MAX_APIC_WORDS]; trace_apic_deliver_irq(dest, dest_mode, delivery_mode, vector_num, trigger_mode); apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode); apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, trigger_mode); } static void apic_set_base(APICCommonState *s, uint64_t val) { s->apicbase = (val & 0xfffff000) | (s->apicbase & (MSR_IA32_APICBASE_BSP | MSR_IA32_APICBASE_ENABLE)); /* if disabled, cannot be enabled again */ if (!(val & MSR_IA32_APICBASE_ENABLE)) { s->apicbase &= ~MSR_IA32_APICBASE_ENABLE; cpu_clear_apic_feature(&s->cpu->env); s->spurious_vec &= ~APIC_SV_ENABLE; } } static void apic_set_tpr(APICCommonState *s, uint8_t val) { /* Updates from cr8 are ignored while the VAPIC is active */ if (!s->vapic_paddr) { s->tpr = val << 4; apic_update_irq(s); } } int apic_get_highest_priority_irr(DeviceState *dev) { APICCommonState *s; if (!dev) { /* no interrupts */ return -1; } s = APIC_COMMON(dev); return get_highest_priority_int(s->irr); } static uint8_t apic_get_tpr(APICCommonState *s) { apic_sync_vapic(s, SYNC_FROM_VAPIC); return s->tpr >> 4; } int apic_get_ppr(APICCommonState *s) { int tpr, isrv, ppr; tpr = (s->tpr >> 4); isrv = get_highest_priority_int(s->isr); if (isrv < 0) isrv = 0; isrv >>= 4; if (tpr >= isrv) ppr = s->tpr; else ppr = isrv << 4; return ppr; } static int apic_get_arb_pri(APICCommonState *s) { /* XXX: arbitration */ return 0; } /* * <0 - low prio interrupt, * 0 - no interrupt, * >0 - interrupt number */ static int apic_irq_pending(APICCommonState *s) { int irrv, ppr; if (!(s->spurious_vec & APIC_SV_ENABLE)) { return 0; } irrv = get_highest_priority_int(s->irr); if (irrv < 0) { return 0; } ppr = apic_get_ppr(s); if (ppr && (irrv & 0xf0) <= (ppr & 0xf0)) { return -1; } return irrv; } /* signal the CPU if an irq is pending */ static void apic_update_irq(APICCommonState *s) { CPUState *cpu; DeviceState *dev = (DeviceState *)s; cpu = CPU(s->cpu); if (!qemu_cpu_is_self(cpu)) { cpu_interrupt(cpu, CPU_INTERRUPT_POLL); } else if (apic_irq_pending(s) > 0) { cpu_interrupt(cpu, CPU_INTERRUPT_HARD); } else if (!apic_accept_pic_intr(dev) || !pic_get_output(isa_pic)) { cpu_reset_interrupt(cpu, CPU_INTERRUPT_HARD); } } void apic_poll_irq(DeviceState *dev) { APICCommonState *s = APIC(dev); apic_sync_vapic(s, SYNC_FROM_VAPIC); apic_update_irq(s); } static void apic_set_irq(APICCommonState *s, int vector_num, int trigger_mode) { kvm_report_irq_delivered(!apic_get_bit(s->irr, vector_num)); apic_set_bit(s->irr, vector_num); if (trigger_mode) apic_set_bit(s->tmr, vector_num); else apic_reset_bit(s->tmr, vector_num); if (s->vapic_paddr) { apic_sync_vapic(s, SYNC_ISR_IRR_TO_VAPIC); /* * The vcpu thread needs to see the new IRR before we pull its current * TPR value. That way, if we miss a lowering of the TRP, the guest * has the chance to notice the new IRR and poll for IRQs on its own. */ smp_wmb(); apic_sync_vapic(s, SYNC_FROM_VAPIC); } apic_update_irq(s); } static void apic_eoi(APICCommonState *s) { int isrv; isrv = get_highest_priority_int(s->isr); if (isrv < 0) return; apic_reset_bit(s->isr, isrv); if (!(s->spurious_vec & APIC_SV_DIRECTED_IO) && apic_get_bit(s->tmr, isrv)) { ioapic_eoi_broadcast(isrv); } apic_sync_vapic(s, SYNC_FROM_VAPIC | SYNC_TO_VAPIC); apic_update_irq(s); } static int apic_find_dest(uint8_t dest) { APICCommonState *apic = local_apics[dest]; int i; if (apic && apic->id == dest) return dest; /* shortcut in case apic->id == local_apics[dest]->id */ for (i = 0; i < MAX_APICS; i++) { apic = local_apics[i]; if (apic && apic->id == dest) return i; if (!apic) break; } return -1; } static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask, uint8_t dest, uint8_t dest_mode) { APICCommonState *apic_iter; int i; if (dest_mode == 0) { if (dest == 0xff) { memset(deliver_bitmask, 0xff, MAX_APIC_WORDS * sizeof(uint32_t)); } else { int idx = apic_find_dest(dest); memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t)); if (idx >= 0) apic_set_bit(deliver_bitmask, idx); } } else { /* XXX: cluster mode */ memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t)); for(i = 0; i < MAX_APICS; i++) { apic_iter = local_apics[i]; if (apic_iter) { if (apic_iter->dest_mode == 0xf) { if (dest & apic_iter->log_dest) apic_set_bit(deliver_bitmask, i); } else if (apic_iter->dest_mode == 0x0) { if ((dest & 0xf0) == (apic_iter->log_dest & 0xf0) && (dest & apic_iter->log_dest & 0x0f)) { apic_set_bit(deliver_bitmask, i); } } } else { break; } } } } static void apic_startup(APICCommonState *s, int vector_num) { s->sipi_vector = vector_num; cpu_interrupt(CPU(s->cpu), CPU_INTERRUPT_SIPI); } void apic_sipi(DeviceState *dev) { APICCommonState *s = APIC(dev); cpu_reset_interrupt(CPU(s->cpu), CPU_INTERRUPT_SIPI); if (!s->wait_for_sipi) return; cpu_x86_load_seg_cache_sipi(s->cpu, s->sipi_vector); s->wait_for_sipi = 0; } static void apic_deliver(DeviceState *dev, uint8_t dest, uint8_t dest_mode, uint8_t delivery_mode, uint8_t vector_num, uint8_t trigger_mode) { APICCommonState *s = APIC(dev); uint32_t deliver_bitmask[MAX_APIC_WORDS]; int dest_shorthand = (s->icr[0] >> 18) & 3; APICCommonState *apic_iter; switch (dest_shorthand) { case 0: apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode); break; case 1: memset(deliver_bitmask, 0x00, sizeof(deliver_bitmask)); apic_set_bit(deliver_bitmask, s->id); break; case 2: memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask)); break; case 3: memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask)); apic_reset_bit(deliver_bitmask, s->id); break; } switch (delivery_mode) { case APIC_DM_INIT: { int trig_mode = (s->icr[0] >> 15) & 1; int level = (s->icr[0] >> 14) & 1; if (level == 0 && trig_mode == 1) { foreach_apic(apic_iter, deliver_bitmask, apic_iter->arb_id = apic_iter->id ); return; } } break; case APIC_DM_SIPI: foreach_apic(apic_iter, deliver_bitmask, apic_startup(apic_iter, vector_num) ); return; } apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, trigger_mode); } static bool apic_check_pic(APICCommonState *s) { DeviceState *dev = (DeviceState *)s; if (!apic_accept_pic_intr(dev) || !pic_get_output(isa_pic)) { return false; } apic_deliver_pic_intr(dev, 1); return true; } int apic_get_interrupt(DeviceState *dev) { APICCommonState *s = APIC(dev); int intno; /* if the APIC is installed or enabled, we let the 8259 handle the IRQs */ if (!s) return -1; if (!(s->spurious_vec & APIC_SV_ENABLE)) return -1; apic_sync_vapic(s, SYNC_FROM_VAPIC); intno = apic_irq_pending(s); /* if there is an interrupt from the 8259, let the caller handle * that first since ExtINT interrupts ignore the priority. */ if (intno == 0 || apic_check_pic(s)) { apic_sync_vapic(s, SYNC_TO_VAPIC); return -1; } else if (intno < 0) { apic_sync_vapic(s, SYNC_TO_VAPIC); return s->spurious_vec & 0xff; } apic_reset_bit(s->irr, intno); apic_set_bit(s->isr, intno); apic_sync_vapic(s, SYNC_TO_VAPIC); apic_update_irq(s); return intno; } int apic_accept_pic_intr(DeviceState *dev) { APICCommonState *s = APIC(dev); uint32_t lvt0; if (!s) return -1; lvt0 = s->lvt[APIC_LVT_LINT0]; if ((s->apicbase & MSR_IA32_APICBASE_ENABLE) == 0 || (lvt0 & APIC_LVT_MASKED) == 0) return isa_pic != NULL; return 0; } static void apic_timer_update(APICCommonState *s, int64_t current_time) { if (apic_next_timer(s, current_time)) { timer_mod(s->timer, s->next_time); } else { timer_del(s->timer); } } static void apic_timer(void *opaque) { APICCommonState *s = opaque; apic_local_deliver(s, APIC_LVT_TIMER); apic_timer_update(s, s->next_time); } static uint64_t apic_mem_read(void *opaque, hwaddr addr, unsigned size) { DeviceState *dev; APICCommonState *s; uint32_t val; int index; if (size < 4) { return 0; } dev = cpu_get_current_apic(); if (!dev) { return 0; } s = APIC(dev); index = (addr >> 4) & 0xff; switch(index) { case 0x02: /* id */ val = s->id << 24; break; case 0x03: /* version */ val = s->version | ((APIC_LVT_NB - 1) << 16); break; case 0x08: apic_sync_vapic(s, SYNC_FROM_VAPIC); if (apic_report_tpr_access) { cpu_report_tpr_access(&s->cpu->env, TPR_ACCESS_READ); } val = s->tpr; break; case 0x09: val = apic_get_arb_pri(s); break; case 0x0a: /* ppr */ val = apic_get_ppr(s); break; case 0x0b: val = 0; break; case 0x0d: val = s->log_dest << 24; break; case 0x0e: val = (s->dest_mode << 28) | 0xfffffff; break; case 0x0f: val = s->spurious_vec; break; case 0x10 ... 0x17: val = s->isr[index & 7]; break; case 0x18 ... 0x1f: val = s->tmr[index & 7]; break; case 0x20 ... 0x27: val = s->irr[index & 7]; break; case 0x28: val = s->esr; break; case 0x30: case 0x31: val = s->icr[index & 1]; break; case 0x32 ... 0x37: val = s->lvt[index - 0x32]; break; case 0x38: val = s->initial_count; break; case 0x39: val = apic_get_current_count(s); break; case 0x3e: val = s->divide_conf; break; default: s->esr |= APIC_ESR_ILLEGAL_ADDRESS; val = 0; break; } trace_apic_mem_readl(addr, val); return val; } static void apic_send_msi(MSIMessage *msi) { uint64_t addr = msi->address; uint32_t data = msi->data; uint8_t dest = (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; uint8_t vector = (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT; uint8_t dest_mode = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1; uint8_t trigger_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1; uint8_t delivery = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7; /* XXX: Ignore redirection hint. */ apic_deliver_irq(dest, dest_mode, delivery, vector, trigger_mode); } static void apic_mem_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) { DeviceState *dev; APICCommonState *s; int index = (addr >> 4) & 0xff; if (size < 4) { return; } if (addr > 0xfff || !index) { /* MSI and MMIO APIC are at the same memory location, * but actually not on the global bus: MSI is on PCI bus * APIC is connected directly to the CPU. * Mapping them on the global bus happens to work because * MSI registers are reserved in APIC MMIO and vice versa. */ MSIMessage msi = { .address = addr, .data = val }; apic_send_msi(&msi); return; } dev = cpu_get_current_apic(); if (!dev) { return; } s = APIC(dev); trace_apic_mem_writel(addr, val); switch(index) { case 0x02: s->id = (val >> 24); break; case 0x03: break; case 0x08: if (apic_report_tpr_access) { cpu_report_tpr_access(&s->cpu->env, TPR_ACCESS_WRITE); } s->tpr = val; apic_sync_vapic(s, SYNC_TO_VAPIC); apic_update_irq(s); break; case 0x09: case 0x0a: break; case 0x0b: /* EOI */ apic_eoi(s); break; case 0x0d: s->log_dest = val >> 24; break; case 0x0e: s->dest_mode = val >> 28; break; case 0x0f: s->spurious_vec = val & 0x1ff; apic_update_irq(s); break; case 0x10 ... 0x17: case 0x18 ... 0x1f: case 0x20 ... 0x27: case 0x28: break; case 0x30: s->icr[0] = val; apic_deliver(dev, (s->icr[1] >> 24) & 0xff, (s->icr[0] >> 11) & 1, (s->icr[0] >> 8) & 7, (s->icr[0] & 0xff), (s->icr[0] >> 15) & 1); break; case 0x31: s->icr[1] = val; break; case 0x32 ... 0x37: { int n = index - 0x32; s->lvt[n] = val; if (n == APIC_LVT_TIMER) { apic_timer_update(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); } else if (n == APIC_LVT_LINT0 && apic_check_pic(s)) { apic_update_irq(s); } } break; case 0x38: s->initial_count = val; s->initial_count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); apic_timer_update(s, s->initial_count_load_time); break; case 0x39: break; case 0x3e: { int v; s->divide_conf = val & 0xb; v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4); s->count_shift = (v + 1) & 7; } break; default: s->esr |= APIC_ESR_ILLEGAL_ADDRESS; break; } } static void apic_pre_save(APICCommonState *s) { apic_sync_vapic(s, SYNC_FROM_VAPIC); } static void apic_post_load(APICCommonState *s) { if (s->timer_expiry != -1) { timer_mod(s->timer, s->timer_expiry); } else { timer_del(s->timer); } } static const MemoryRegionOps apic_io_ops = { .read = apic_mem_read, .write = apic_mem_write, .impl.min_access_size = 1, .impl.max_access_size = 4, .valid.min_access_size = 1, .valid.max_access_size = 4, .endianness = DEVICE_NATIVE_ENDIAN, }; static void apic_realize(DeviceState *dev, Error **errp) { APICCommonState *s = APIC(dev); if (s->id >= MAX_APICS) { error_setg(errp, "%s initialization failed. APIC ID %d is invalid", object_get_typename(OBJECT(dev)), s->id); return; } if (kvm_enabled()) { warn_report("Userspace local APIC is deprecated for KVM."); warn_report("Do not use kernel-irqchip except for the -M isapc machine type."); } memory_region_init_io(&s->io_memory, OBJECT(s), &apic_io_ops, s, "apic-msi", APIC_SPACE_SIZE); s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, apic_timer, s); local_apics[s->id] = s; msi_nonbroken = true; } static void apic_unrealize(DeviceState *dev) { APICCommonState *s = APIC(dev); timer_free(s->timer); local_apics[s->id] = NULL; } static void apic_class_init(ObjectClass *klass, void *data) { APICCommonClass *k = APIC_COMMON_CLASS(klass); k->realize = apic_realize; k->unrealize = apic_unrealize; k->set_base = apic_set_base; k->set_tpr = apic_set_tpr; k->get_tpr = apic_get_tpr; k->vapic_base_update = apic_vapic_base_update; k->external_nmi = apic_external_nmi; k->pre_save = apic_pre_save; k->post_load = apic_post_load; k->send_msi = apic_send_msi; } static const TypeInfo apic_info = { .name = TYPE_APIC, .instance_size = sizeof(APICCommonState), .parent = TYPE_APIC_COMMON, .class_init = apic_class_init, }; static void apic_register_types(void) { type_register_static(&apic_info); } type_init(apic_register_types)