| |
| /* |
| * Local APIC virtualization |
| * |
| * Copyright (C) 2006 Qumranet, Inc. |
| * Copyright (C) 2007 Novell |
| * Copyright (C) 2007 Intel |
| * |
| * Authors: |
| * Dor Laor <dor.laor@qumranet.com> |
| * Gregory Haskins <ghaskins@novell.com> |
| * Yaozu (Eddie) Dong <eddie.dong@intel.com> |
| * |
| * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation. |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| */ |
| |
| #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/module.h> |
| #include <linux/math64.h> |
| #include <asm/processor.h> |
| #include <asm/msr.h> |
| #include <asm/page.h> |
| #include <asm/current.h> |
| #include <asm/apicdef.h> |
| #include <asm/atomic.h> |
| #include <asm/apicdef.h> |
| #include "kvm_cache_regs.h" |
| #include "irq.h" |
| #include "trace.h" |
| #include "x86.h" |
| |
| #ifndef CONFIG_X86_64 |
| #define mod_64(x, y) ((x) - (y) * div64_u64(x, y)) |
| #else |
| #define mod_64(x, y) ((x) % (y)) |
| #endif |
| |
| #define PRId64 "d" |
| #define PRIx64 "llx" |
| #define PRIu64 "u" |
| #define PRIo64 "o" |
| |
| #define APIC_BUS_CYCLE_NS 1 |
| |
| /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */ |
| #define apic_debug(fmt, arg...) |
| |
| #define APIC_LVT_NUM 6 |
| /* 14 is the version for Xeon and Pentium 8.4.8*/ |
| #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16)) |
| #define LAPIC_MMIO_LENGTH (1 << 12) |
| /* followed define is not in apicdef.h */ |
| #define APIC_SHORT_MASK 0xc0000 |
| #define APIC_DEST_NOSHORT 0x0 |
| #define APIC_DEST_MASK 0x800 |
| #define MAX_APIC_VECTOR 256 |
| |
| #define VEC_POS(v) ((v) & (32 - 1)) |
| #define REG_POS(v) (((v) >> 5) << 4) |
| |
| static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off) |
| { |
| return *((u32 *) (apic->regs + reg_off)); |
| } |
| |
| static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val) |
| { |
| *((u32 *) (apic->regs + reg_off)) = val; |
| } |
| |
| static inline int apic_test_and_set_vector(int vec, void *bitmap) |
| { |
| return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec)); |
| } |
| |
| static inline int apic_test_and_clear_vector(int vec, void *bitmap) |
| { |
| return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec)); |
| } |
| |
| static inline void apic_set_vector(int vec, void *bitmap) |
| { |
| set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec)); |
| } |
| |
| static inline void apic_clear_vector(int vec, void *bitmap) |
| { |
| clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec)); |
| } |
| |
| static inline int apic_hw_enabled(struct kvm_lapic *apic) |
| { |
| return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE; |
| } |
| |
| static inline int apic_sw_enabled(struct kvm_lapic *apic) |
| { |
| return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED; |
| } |
| |
| static inline int apic_enabled(struct kvm_lapic *apic) |
| { |
| return apic_sw_enabled(apic) && apic_hw_enabled(apic); |
| } |
| |
| #define LVT_MASK \ |
| (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK) |
| |
| #define LINT_MASK \ |
| (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \ |
| APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER) |
| |
| static inline int kvm_apic_id(struct kvm_lapic *apic) |
| { |
| return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff; |
| } |
| |
| static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type) |
| { |
| return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED); |
| } |
| |
| static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type) |
| { |
| return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK; |
| } |
| |
| static inline int apic_lvtt_period(struct kvm_lapic *apic) |
| { |
| return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC; |
| } |
| |
| static inline int apic_lvt_nmi_mode(u32 lvt_val) |
| { |
| return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI; |
| } |
| |
| void kvm_apic_set_version(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| struct kvm_cpuid_entry2 *feat; |
| u32 v = APIC_VERSION; |
| |
| if (!irqchip_in_kernel(vcpu->kvm)) |
| return; |
| |
| feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0); |
| if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31)))) |
| v |= APIC_LVR_DIRECTED_EOI; |
| apic_set_reg(apic, APIC_LVR, v); |
| } |
| |
| static inline int apic_x2apic_mode(struct kvm_lapic *apic) |
| { |
| return apic->vcpu->arch.apic_base & X2APIC_ENABLE; |
| } |
| |
| static unsigned int apic_lvt_mask[APIC_LVT_NUM] = { |
| LVT_MASK | APIC_LVT_TIMER_PERIODIC, /* LVTT */ |
| LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */ |
| LVT_MASK | APIC_MODE_MASK, /* LVTPC */ |
| LINT_MASK, LINT_MASK, /* LVT0-1 */ |
| LVT_MASK /* LVTERR */ |
| }; |
| |
| static int find_highest_vector(void *bitmap) |
| { |
| u32 *word = bitmap; |
| int word_offset = MAX_APIC_VECTOR >> 5; |
| |
| while ((word_offset != 0) && (word[(--word_offset) << 2] == 0)) |
| continue; |
| |
| if (likely(!word_offset && !word[0])) |
| return -1; |
| else |
| return fls(word[word_offset << 2]) - 1 + (word_offset << 5); |
| } |
| |
| static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic) |
| { |
| apic->irr_pending = true; |
| return apic_test_and_set_vector(vec, apic->regs + APIC_IRR); |
| } |
| |
| static inline int apic_search_irr(struct kvm_lapic *apic) |
| { |
| return find_highest_vector(apic->regs + APIC_IRR); |
| } |
| |
| static inline int apic_find_highest_irr(struct kvm_lapic *apic) |
| { |
| int result; |
| |
| if (!apic->irr_pending) |
| return -1; |
| |
| result = apic_search_irr(apic); |
| ASSERT(result == -1 || result >= 16); |
| |
| return result; |
| } |
| |
| static inline void apic_clear_irr(int vec, struct kvm_lapic *apic) |
| { |
| apic->irr_pending = false; |
| apic_clear_vector(vec, apic->regs + APIC_IRR); |
| if (apic_search_irr(apic) != -1) |
| apic->irr_pending = true; |
| } |
| |
| int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| int highest_irr; |
| |
| /* This may race with setting of irr in __apic_accept_irq() and |
| * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq |
| * will cause vmexit immediately and the value will be recalculated |
| * on the next vmentry. |
| */ |
| if (!apic) |
| return 0; |
| highest_irr = apic_find_highest_irr(apic); |
| |
| return highest_irr; |
| } |
| |
| static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, |
| int vector, int level, int trig_mode); |
| |
| int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| return __apic_accept_irq(apic, irq->delivery_mode, irq->vector, |
| irq->level, irq->trig_mode); |
| } |
| |
| static inline int apic_find_highest_isr(struct kvm_lapic *apic) |
| { |
| int result; |
| |
| result = find_highest_vector(apic->regs + APIC_ISR); |
| ASSERT(result == -1 || result >= 16); |
| |
| return result; |
| } |
| |
| static void apic_update_ppr(struct kvm_lapic *apic) |
| { |
| u32 tpr, isrv, ppr; |
| int isr; |
| |
| tpr = apic_get_reg(apic, APIC_TASKPRI); |
| isr = apic_find_highest_isr(apic); |
| isrv = (isr != -1) ? isr : 0; |
| |
| if ((tpr & 0xf0) >= (isrv & 0xf0)) |
| ppr = tpr & 0xff; |
| else |
| ppr = isrv & 0xf0; |
| |
| apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x", |
| apic, ppr, isr, isrv); |
| |
| apic_set_reg(apic, APIC_PROCPRI, ppr); |
| } |
| |
| static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr) |
| { |
| apic_set_reg(apic, APIC_TASKPRI, tpr); |
| apic_update_ppr(apic); |
| } |
| |
| int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest) |
| { |
| return dest == 0xff || kvm_apic_id(apic) == dest; |
| } |
| |
| int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda) |
| { |
| int result = 0; |
| u32 logical_id; |
| |
| if (apic_x2apic_mode(apic)) { |
| logical_id = apic_get_reg(apic, APIC_LDR); |
| return logical_id & mda; |
| } |
| |
| logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR)); |
| |
| switch (apic_get_reg(apic, APIC_DFR)) { |
| case APIC_DFR_FLAT: |
| if (logical_id & mda) |
| result = 1; |
| break; |
| case APIC_DFR_CLUSTER: |
| if (((logical_id >> 4) == (mda >> 0x4)) |
| && (logical_id & mda & 0xf)) |
| result = 1; |
| break; |
| default: |
| printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n", |
| apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR)); |
| break; |
| } |
| |
| return result; |
| } |
| |
| int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source, |
| int short_hand, int dest, int dest_mode) |
| { |
| int result = 0; |
| struct kvm_lapic *target = vcpu->arch.apic; |
| |
| apic_debug("target %p, source %p, dest 0x%x, " |
| "dest_mode 0x%x, short_hand 0x%x\n", |
| target, source, dest, dest_mode, short_hand); |
| |
| ASSERT(!target); |
| switch (short_hand) { |
| case APIC_DEST_NOSHORT: |
| if (dest_mode == 0) |
| /* Physical mode. */ |
| result = kvm_apic_match_physical_addr(target, dest); |
| else |
| /* Logical mode. */ |
| result = kvm_apic_match_logical_addr(target, dest); |
| break; |
| case APIC_DEST_SELF: |
| result = (target == source); |
| break; |
| case APIC_DEST_ALLINC: |
| result = 1; |
| break; |
| case APIC_DEST_ALLBUT: |
| result = (target != source); |
| break; |
| default: |
| printk(KERN_WARNING "Bad dest shorthand value %x\n", |
| short_hand); |
| break; |
| } |
| |
| return result; |
| } |
| |
| /* |
| * Add a pending IRQ into lapic. |
| * Return 1 if successfully added and 0 if discarded. |
| */ |
| static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, |
| int vector, int level, int trig_mode) |
| { |
| int result = 0; |
| struct kvm_vcpu *vcpu = apic->vcpu; |
| |
| switch (delivery_mode) { |
| case APIC_DM_LOWEST: |
| vcpu->arch.apic_arb_prio++; |
| case APIC_DM_FIXED: |
| /* FIXME add logic for vcpu on reset */ |
| if (unlikely(!apic_enabled(apic))) |
| break; |
| |
| result = !apic_test_and_set_irr(vector, apic); |
| if (!result) { |
| if (trig_mode) |
| apic_debug("level trig mode repeatedly for " |
| "vector %d", vector); |
| break; |
| } |
| |
| if (trig_mode) { |
| apic_debug("level trig mode for vector %d", vector); |
| apic_set_vector(vector, apic->regs + APIC_TMR); |
| } else |
| apic_clear_vector(vector, apic->regs + APIC_TMR); |
| kvm_vcpu_kick(vcpu); |
| break; |
| |
| case APIC_DM_REMRD: |
| printk(KERN_DEBUG "Ignoring delivery mode 3\n"); |
| break; |
| |
| case APIC_DM_SMI: |
| printk(KERN_DEBUG "Ignoring guest SMI\n"); |
| break; |
| |
| case APIC_DM_NMI: |
| result = 1; |
| kvm_inject_nmi(vcpu); |
| kvm_vcpu_kick(vcpu); |
| break; |
| |
| case APIC_DM_INIT: |
| if (level) { |
| result = 1; |
| if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE) |
| printk(KERN_DEBUG |
| "INIT on a runnable vcpu %d\n", |
| vcpu->vcpu_id); |
| vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED; |
| kvm_vcpu_kick(vcpu); |
| } else { |
| apic_debug("Ignoring de-assert INIT to vcpu %d\n", |
| vcpu->vcpu_id); |
| } |
| break; |
| |
| case APIC_DM_STARTUP: |
| apic_debug("SIPI to vcpu %d vector 0x%02x\n", |
| vcpu->vcpu_id, vector); |
| if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) { |
| result = 1; |
| vcpu->arch.sipi_vector = vector; |
| vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED; |
| kvm_vcpu_kick(vcpu); |
| } |
| break; |
| |
| case APIC_DM_EXTINT: |
| /* |
| * Should only be called by kvm_apic_local_deliver() with LVT0, |
| * before NMI watchdog was enabled. Already handled by |
| * kvm_apic_accept_pic_intr(). |
| */ |
| break; |
| |
| default: |
| printk(KERN_ERR "TODO: unsupported delivery mode %x\n", |
| delivery_mode); |
| break; |
| } |
| return result; |
| } |
| |
| int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2) |
| { |
| return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio; |
| } |
| |
| static void apic_set_eoi(struct kvm_lapic *apic) |
| { |
| int vector = apic_find_highest_isr(apic); |
| int trigger_mode; |
| /* |
| * Not every write EOI will has corresponding ISR, |
| * one example is when Kernel check timer on setup_IO_APIC |
| */ |
| if (vector == -1) |
| return; |
| |
| apic_clear_vector(vector, apic->regs + APIC_ISR); |
| apic_update_ppr(apic); |
| |
| if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR)) |
| trigger_mode = IOAPIC_LEVEL_TRIG; |
| else |
| trigger_mode = IOAPIC_EDGE_TRIG; |
| if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI)) { |
| mutex_lock(&apic->vcpu->kvm->irq_lock); |
| kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode); |
| mutex_unlock(&apic->vcpu->kvm->irq_lock); |
| } |
| } |
| |
| static void apic_send_ipi(struct kvm_lapic *apic) |
| { |
| u32 icr_low = apic_get_reg(apic, APIC_ICR); |
| u32 icr_high = apic_get_reg(apic, APIC_ICR2); |
| struct kvm_lapic_irq irq; |
| |
| irq.vector = icr_low & APIC_VECTOR_MASK; |
| irq.delivery_mode = icr_low & APIC_MODE_MASK; |
| irq.dest_mode = icr_low & APIC_DEST_MASK; |
| irq.level = icr_low & APIC_INT_ASSERT; |
| irq.trig_mode = icr_low & APIC_INT_LEVELTRIG; |
| irq.shorthand = icr_low & APIC_SHORT_MASK; |
| if (apic_x2apic_mode(apic)) |
| irq.dest_id = icr_high; |
| else |
| irq.dest_id = GET_APIC_DEST_FIELD(icr_high); |
| |
| apic_debug("icr_high 0x%x, icr_low 0x%x, " |
| "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, " |
| "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n", |
| icr_high, icr_low, irq.shorthand, irq.dest_id, |
| irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode, |
| irq.vector); |
| |
| mutex_lock(&apic->vcpu->kvm->irq_lock); |
| kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq); |
| mutex_unlock(&apic->vcpu->kvm->irq_lock); |
| } |
| |
| static u32 apic_get_tmcct(struct kvm_lapic *apic) |
| { |
| ktime_t remaining; |
| s64 ns; |
| u32 tmcct; |
| |
| ASSERT(apic != NULL); |
| |
| /* if initial count is 0, current count should also be 0 */ |
| if (apic_get_reg(apic, APIC_TMICT) == 0) |
| return 0; |
| |
| 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->lapic_timer.period); |
| tmcct = div64_u64(ns, |
| (APIC_BUS_CYCLE_NS * apic->divide_count)); |
| |
| return tmcct; |
| } |
| |
| static void __report_tpr_access(struct kvm_lapic *apic, bool write) |
| { |
| struct kvm_vcpu *vcpu = apic->vcpu; |
| struct kvm_run *run = vcpu->run; |
| |
| set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests); |
| run->tpr_access.rip = kvm_rip_read(vcpu); |
| run->tpr_access.is_write = write; |
| } |
| |
| static inline void report_tpr_access(struct kvm_lapic *apic, bool write) |
| { |
| if (apic->vcpu->arch.tpr_access_reporting) |
| __report_tpr_access(apic, write); |
| } |
| |
| static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset) |
| { |
| u32 val = 0; |
| |
| if (offset >= LAPIC_MMIO_LENGTH) |
| return 0; |
| |
| switch (offset) { |
| case APIC_ID: |
| if (apic_x2apic_mode(apic)) |
| val = kvm_apic_id(apic); |
| else |
| val = kvm_apic_id(apic) << 24; |
| break; |
| case APIC_ARBPRI: |
| printk(KERN_WARNING "Access APIC ARBPRI register " |
| "which is for P6\n"); |
| break; |
| |
| case APIC_TMCCT: /* Timer CCR */ |
| val = apic_get_tmcct(apic); |
| break; |
| |
| case APIC_TASKPRI: |
| report_tpr_access(apic, false); |
| /* fall thru */ |
| default: |
| apic_update_ppr(apic); |
| val = apic_get_reg(apic, offset); |
| break; |
| } |
| |
| return val; |
| } |
| |
| static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev) |
| { |
| return container_of(dev, struct kvm_lapic, dev); |
| } |
| |
| static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len, |
| void *data) |
| { |
| unsigned char alignment = offset & 0xf; |
| u32 result; |
| /* this bitmask has a bit cleared for each reserver register */ |
| static const u64 rmask = 0x43ff01ffffffe70cULL; |
| |
| if ((alignment + len) > 4) { |
| printk(KERN_ERR "KVM_APIC_READ: alignment error %x %d\n", |
| offset, len); |
| return 1; |
| } |
| |
| if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) { |
| printk(KERN_ERR "KVM_APIC_READ: read reserved register %x\n", |
| offset); |
| return 1; |
| } |
| |
| result = __apic_read(apic, offset & ~0xf); |
| |
| trace_kvm_apic_read(offset, result); |
| |
| switch (len) { |
| case 1: |
| case 2: |
| case 4: |
| memcpy(data, (char *)&result + alignment, len); |
| break; |
| default: |
| printk(KERN_ERR "Local APIC read with len = %x, " |
| "should be 1,2, or 4 instead\n", len); |
| break; |
| } |
| return 0; |
| } |
| |
| static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr) |
| { |
| return apic_hw_enabled(apic) && |
| addr >= apic->base_address && |
| addr < apic->base_address + LAPIC_MMIO_LENGTH; |
| } |
| |
| static int apic_mmio_read(struct kvm_io_device *this, |
| gpa_t address, int len, void *data) |
| { |
| struct kvm_lapic *apic = to_lapic(this); |
| u32 offset = address - apic->base_address; |
| |
| if (!apic_mmio_in_range(apic, address)) |
| return -EOPNOTSUPP; |
| |
| apic_reg_read(apic, offset, len, data); |
| |
| return 0; |
| } |
| |
| static void update_divide_count(struct kvm_lapic *apic) |
| { |
| u32 tmp1, tmp2, tdcr; |
| |
| tdcr = apic_get_reg(apic, APIC_TDCR); |
| tmp1 = tdcr & 0xf; |
| tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1; |
| apic->divide_count = 0x1 << (tmp2 & 0x7); |
| |
| apic_debug("timer divide count is 0x%x\n", |
| apic->divide_count); |
| } |
| |
| static void start_apic_timer(struct kvm_lapic *apic) |
| { |
| ktime_t now = apic->lapic_timer.timer.base->get_time(); |
| |
| 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->lapic_timer.period) |
| return; |
| |
| 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" |
| PRIx64 ", " |
| "timer initial count 0x%x, period %lldns, " |
| "expire @ 0x%016" PRIx64 ".\n", __func__, |
| APIC_BUS_CYCLE_NS, ktime_to_ns(now), |
| apic_get_reg(apic, APIC_TMICT), |
| apic->lapic_timer.period, |
| ktime_to_ns(ktime_add_ns(now, |
| apic->lapic_timer.period))); |
| } |
| |
| static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val) |
| { |
| int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0)); |
| |
| if (apic_lvt_nmi_mode(lvt0_val)) { |
| if (!nmi_wd_enabled) { |
| apic_debug("Receive NMI setting on APIC_LVT0 " |
| "for cpu %d\n", apic->vcpu->vcpu_id); |
| apic->vcpu->kvm->arch.vapics_in_nmi_mode++; |
| } |
| } else if (nmi_wd_enabled) |
| apic->vcpu->kvm->arch.vapics_in_nmi_mode--; |
| } |
| |
| static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val) |
| { |
| int ret = 0; |
| |
| trace_kvm_apic_write(reg, val); |
| |
| switch (reg) { |
| case APIC_ID: /* Local APIC ID */ |
| if (!apic_x2apic_mode(apic)) |
| apic_set_reg(apic, APIC_ID, val); |
| else |
| ret = 1; |
| break; |
| |
| case APIC_TASKPRI: |
| report_tpr_access(apic, true); |
| apic_set_tpr(apic, val & 0xff); |
| break; |
| |
| case APIC_EOI: |
| apic_set_eoi(apic); |
| break; |
| |
| case APIC_LDR: |
| if (!apic_x2apic_mode(apic)) |
| apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK); |
| else |
| ret = 1; |
| break; |
| |
| case APIC_DFR: |
| if (!apic_x2apic_mode(apic)) |
| apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF); |
| else |
| ret = 1; |
| break; |
| |
| case APIC_SPIV: { |
| u32 mask = 0x3ff; |
| if (apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI) |
| mask |= APIC_SPIV_DIRECTED_EOI; |
| apic_set_reg(apic, APIC_SPIV, val & mask); |
| if (!(val & APIC_SPIV_APIC_ENABLED)) { |
| int i; |
| u32 lvt_val; |
| |
| for (i = 0; i < APIC_LVT_NUM; i++) { |
| lvt_val = apic_get_reg(apic, |
| APIC_LVTT + 0x10 * i); |
| apic_set_reg(apic, APIC_LVTT + 0x10 * i, |
| lvt_val | APIC_LVT_MASKED); |
| } |
| atomic_set(&apic->lapic_timer.pending, 0); |
| |
| } |
| break; |
| } |
| case APIC_ICR: |
| /* No delay here, so we always clear the pending bit */ |
| apic_set_reg(apic, APIC_ICR, val & ~(1 << 12)); |
| apic_send_ipi(apic); |
| break; |
| |
| case APIC_ICR2: |
| if (!apic_x2apic_mode(apic)) |
| val &= 0xff000000; |
| apic_set_reg(apic, APIC_ICR2, val); |
| break; |
| |
| case APIC_LVT0: |
| apic_manage_nmi_watchdog(apic, val); |
| case APIC_LVTT: |
| case APIC_LVTTHMR: |
| case APIC_LVTPC: |
| case APIC_LVT1: |
| case APIC_LVTERR: |
| /* TODO: Check vector */ |
| if (!apic_sw_enabled(apic)) |
| val |= APIC_LVT_MASKED; |
| |
| val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4]; |
| apic_set_reg(apic, reg, val); |
| |
| break; |
| |
| case APIC_TMICT: |
| hrtimer_cancel(&apic->lapic_timer.timer); |
| apic_set_reg(apic, APIC_TMICT, val); |
| start_apic_timer(apic); |
| break; |
| |
| case APIC_TDCR: |
| if (val & 4) |
| printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val); |
| apic_set_reg(apic, APIC_TDCR, val); |
| update_divide_count(apic); |
| break; |
| |
| case APIC_ESR: |
| if (apic_x2apic_mode(apic) && val != 0) { |
| printk(KERN_ERR "KVM_WRITE:ESR not zero %x\n", val); |
| ret = 1; |
| } |
| break; |
| |
| case APIC_SELF_IPI: |
| if (apic_x2apic_mode(apic)) { |
| apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff)); |
| } else |
| ret = 1; |
| break; |
| default: |
| ret = 1; |
| break; |
| } |
| if (ret) |
| apic_debug("Local APIC Write to read-only register %x\n", reg); |
| return ret; |
| } |
| |
| static int apic_mmio_write(struct kvm_io_device *this, |
| gpa_t address, int len, const void *data) |
| { |
| struct kvm_lapic *apic = to_lapic(this); |
| unsigned int offset = address - apic->base_address; |
| u32 val; |
| |
| if (!apic_mmio_in_range(apic, address)) |
| return -EOPNOTSUPP; |
| |
| /* |
| * APIC register must be aligned on 128-bits boundary. |
| * 32/64/128 bits registers must be accessed thru 32 bits. |
| * Refer SDM 8.4.1 |
| */ |
| if (len != 4 || (offset & 0xf)) { |
| /* Don't shout loud, $infamous_os would cause only noise. */ |
| apic_debug("apic write: bad size=%d %lx\n", len, (long)address); |
| return 0; |
| } |
| |
| val = *(u32*)data; |
| |
| /* too common printing */ |
| if (offset != APIC_EOI) |
| apic_debug("%s: offset 0x%x with length 0x%x, and value is " |
| "0x%x\n", __func__, offset, len, val); |
| |
| apic_reg_write(apic, offset & 0xff0, val); |
| |
| return 0; |
| } |
| |
| void kvm_free_lapic(struct kvm_vcpu *vcpu) |
| { |
| if (!vcpu->arch.apic) |
| return; |
| |
| hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer); |
| |
| if (vcpu->arch.apic->regs_page) |
| __free_page(vcpu->arch.apic->regs_page); |
| |
| kfree(vcpu->arch.apic); |
| } |
| |
| /* |
| *---------------------------------------------------------------------- |
| * LAPIC interface |
| *---------------------------------------------------------------------- |
| */ |
| |
| void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| if (!apic) |
| return; |
| apic_set_tpr(apic, ((cr8 & 0x0f) << 4) |
| | (apic_get_reg(apic, APIC_TASKPRI) & 4)); |
| } |
| |
| u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| u64 tpr; |
| |
| if (!apic) |
| return 0; |
| tpr = (u64) apic_get_reg(apic, APIC_TASKPRI); |
| |
| return (tpr & 0xf0) >> 4; |
| } |
| |
| void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| if (!apic) { |
| value |= MSR_IA32_APICBASE_BSP; |
| vcpu->arch.apic_base = value; |
| return; |
| } |
| |
| if (!kvm_vcpu_is_bsp(apic->vcpu)) |
| value &= ~MSR_IA32_APICBASE_BSP; |
| |
| vcpu->arch.apic_base = value; |
| if (apic_x2apic_mode(apic)) { |
| u32 id = kvm_apic_id(apic); |
| u32 ldr = ((id & ~0xf) << 16) | (1 << (id & 0xf)); |
| apic_set_reg(apic, APIC_LDR, ldr); |
| } |
| apic->base_address = apic->vcpu->arch.apic_base & |
| MSR_IA32_APICBASE_BASE; |
| |
| /* with FSB delivery interrupt, we can restart APIC functionality */ |
| apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is " |
| "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address); |
| |
| } |
| |
| void kvm_lapic_reset(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic; |
| int i; |
| |
| apic_debug("%s\n", __func__); |
| |
| ASSERT(vcpu); |
| apic = vcpu->arch.apic; |
| ASSERT(apic != NULL); |
| |
| /* Stop the timer in case it's a reset to an active apic */ |
| hrtimer_cancel(&apic->lapic_timer.timer); |
| |
| apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24); |
| kvm_apic_set_version(apic->vcpu); |
| |
| for (i = 0; i < APIC_LVT_NUM; i++) |
| apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED); |
| apic_set_reg(apic, APIC_LVT0, |
| SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT)); |
| |
| apic_set_reg(apic, APIC_DFR, 0xffffffffU); |
| apic_set_reg(apic, APIC_SPIV, 0xff); |
| apic_set_reg(apic, APIC_TASKPRI, 0); |
| apic_set_reg(apic, APIC_LDR, 0); |
| apic_set_reg(apic, APIC_ESR, 0); |
| apic_set_reg(apic, APIC_ICR, 0); |
| apic_set_reg(apic, APIC_ICR2, 0); |
| apic_set_reg(apic, APIC_TDCR, 0); |
| apic_set_reg(apic, APIC_TMICT, 0); |
| for (i = 0; i < 8; i++) { |
| apic_set_reg(apic, APIC_IRR + 0x10 * i, 0); |
| apic_set_reg(apic, APIC_ISR + 0x10 * i, 0); |
| apic_set_reg(apic, APIC_TMR + 0x10 * i, 0); |
| } |
| apic->irr_pending = false; |
| update_divide_count(apic); |
| atomic_set(&apic->lapic_timer.pending, 0); |
| if (kvm_vcpu_is_bsp(vcpu)) |
| vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP; |
| apic_update_ppr(apic); |
| |
| vcpu->arch.apic_arb_prio = 0; |
| |
| apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr=" |
| "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__, |
| vcpu, kvm_apic_id(apic), |
| vcpu->arch.apic_base, apic->base_address); |
| } |
| |
| bool kvm_apic_present(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic); |
| } |
| |
| int kvm_lapic_enabled(struct kvm_vcpu *vcpu) |
| { |
| return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic); |
| } |
| |
| /* |
| *---------------------------------------------------------------------- |
| * timer interface |
| *---------------------------------------------------------------------- |
| */ |
| |
| static bool lapic_is_periodic(struct kvm_timer *ktimer) |
| { |
| 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) |
| { |
| struct kvm_lapic *lapic = vcpu->arch.apic; |
| |
| if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT)) |
| return atomic_read(&lapic->lapic_timer.pending); |
| |
| return 0; |
| } |
| |
| static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type) |
| { |
| u32 reg = apic_get_reg(apic, lvt_type); |
| int vector, mode, trig_mode; |
| |
| if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) { |
| vector = reg & APIC_VECTOR_MASK; |
| mode = reg & APIC_MODE_MASK; |
| trig_mode = reg & APIC_LVT_LEVEL_TRIGGER; |
| return __apic_accept_irq(apic, mode, vector, 1, trig_mode); |
| } |
| return 0; |
| } |
| |
| void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| if (apic) |
| kvm_apic_local_deliver(apic, APIC_LVT0); |
| } |
| |
| static struct kvm_timer_ops lapic_timer_ops = { |
| .is_periodic = lapic_is_periodic, |
| }; |
| |
| static const struct kvm_io_device_ops apic_mmio_ops = { |
| .read = apic_mmio_read, |
| .write = apic_mmio_write, |
| }; |
| |
| int kvm_create_lapic(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic; |
| |
| ASSERT(vcpu != NULL); |
| apic_debug("apic_init %d\n", vcpu->vcpu_id); |
| |
| apic = kzalloc(sizeof(*apic), GFP_KERNEL); |
| if (!apic) |
| goto nomem; |
| |
| vcpu->arch.apic = apic; |
| |
| apic->regs_page = alloc_page(GFP_KERNEL); |
| if (apic->regs_page == NULL) { |
| printk(KERN_ERR "malloc apic regs error for vcpu %x\n", |
| vcpu->vcpu_id); |
| goto nomem_free_apic; |
| } |
| apic->regs = page_address(apic->regs_page); |
| memset(apic->regs, 0, PAGE_SIZE); |
| apic->vcpu = vcpu; |
| |
| 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 = vcpu; |
| |
| apic->base_address = APIC_DEFAULT_PHYS_BASE; |
| vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE; |
| |
| kvm_lapic_reset(vcpu); |
| kvm_iodevice_init(&apic->dev, &apic_mmio_ops); |
| |
| return 0; |
| nomem_free_apic: |
| kfree(apic); |
| nomem: |
| return -ENOMEM; |
| } |
| |
| int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| int highest_irr; |
| |
| if (!apic || !apic_enabled(apic)) |
| return -1; |
| |
| apic_update_ppr(apic); |
| highest_irr = apic_find_highest_irr(apic); |
| if ((highest_irr == -1) || |
| ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI))) |
| return -1; |
| return highest_irr; |
| } |
| |
| int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu) |
| { |
| u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0); |
| int r = 0; |
| |
| if (kvm_vcpu_is_bsp(vcpu)) { |
| if (!apic_hw_enabled(vcpu->arch.apic)) |
| r = 1; |
| if ((lvt0 & APIC_LVT_MASKED) == 0 && |
| GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT) |
| r = 1; |
| } |
| return r; |
| } |
| |
| void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| if (apic && atomic_read(&apic->lapic_timer.pending) > 0) { |
| if (kvm_apic_local_deliver(apic, APIC_LVTT)) |
| atomic_dec(&apic->lapic_timer.pending); |
| } |
| } |
| |
| int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu) |
| { |
| int vector = kvm_apic_has_interrupt(vcpu); |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| if (vector == -1) |
| return -1; |
| |
| apic_set_vector(vector, apic->regs + APIC_ISR); |
| apic_update_ppr(apic); |
| apic_clear_irr(vector, apic); |
| return vector; |
| } |
| |
| void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| apic->base_address = vcpu->arch.apic_base & |
| MSR_IA32_APICBASE_BASE; |
| kvm_apic_set_version(vcpu); |
| |
| apic_update_ppr(apic); |
| hrtimer_cancel(&apic->lapic_timer.timer); |
| update_divide_count(apic); |
| start_apic_timer(apic); |
| } |
| |
| void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| struct hrtimer *timer; |
| |
| if (!apic) |
| return; |
| |
| timer = &apic->lapic_timer.timer; |
| if (hrtimer_cancel(timer)) |
| hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
| } |
| |
| void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu) |
| { |
| u32 data; |
| void *vapic; |
| |
| if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr) |
| return; |
| |
| vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0); |
| data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)); |
| kunmap_atomic(vapic, KM_USER0); |
| |
| apic_set_tpr(vcpu->arch.apic, data & 0xff); |
| } |
| |
| void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu) |
| { |
| u32 data, tpr; |
| int max_irr, max_isr; |
| struct kvm_lapic *apic; |
| void *vapic; |
| |
| if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr) |
| return; |
| |
| apic = vcpu->arch.apic; |
| tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff; |
| max_irr = apic_find_highest_irr(apic); |
| if (max_irr < 0) |
| max_irr = 0; |
| max_isr = apic_find_highest_isr(apic); |
| if (max_isr < 0) |
| max_isr = 0; |
| data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24); |
| |
| vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0); |
| *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data; |
| kunmap_atomic(vapic, KM_USER0); |
| } |
| |
| void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr) |
| { |
| if (!irqchip_in_kernel(vcpu->kvm)) |
| return; |
| |
| vcpu->arch.apic->vapic_addr = vapic_addr; |
| } |
| |
| int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| u32 reg = (msr - APIC_BASE_MSR) << 4; |
| |
| if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic)) |
| return 1; |
| |
| /* if this is ICR write vector before command */ |
| if (msr == 0x830) |
| apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32)); |
| return apic_reg_write(apic, reg, (u32)data); |
| } |
| |
| int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data) |
| { |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0; |
| |
| if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic)) |
| return 1; |
| |
| if (apic_reg_read(apic, reg, 4, &low)) |
| return 1; |
| if (msr == 0x830) |
| apic_reg_read(apic, APIC_ICR2, 4, &high); |
| |
| *data = (((u64)high) << 32) | low; |
| |
| return 0; |
| } |