3 * Local APIC virtualization
5 * Copyright (C) 2006 Qumranet, Inc.
6 * Copyright (C) 2007 Novell
7 * Copyright (C) 2007 Intel
10 * Dor Laor <dor.laor@qumranet.com>
11 * Gregory Haskins <ghaskins@novell.com>
12 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
14 * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
16 * This work is licensed under the terms of the GNU GPL, version 2. See
17 * the COPYING file in the top-level directory.
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
23 #include <linux/highmem.h>
24 #include <linux/smp.h>
25 #include <linux/hrtimer.h>
27 #include <linux/module.h>
28 #include <linux/math64.h>
29 #include <asm/processor.h>
32 #include <asm/current.h>
33 #include <asm/apicdef.h>
34 #include <asm/atomic.h>
35 #include "kvm_cache_regs.h"
39 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
41 #define mod_64(x, y) ((x) % (y))
49 #define APIC_BUS_CYCLE_NS 1
51 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
52 #define apic_debug(fmt, arg...)
54 #define APIC_LVT_NUM 6
55 /* 14 is the version for Xeon and Pentium 8.4.8*/
56 #define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
57 #define LAPIC_MMIO_LENGTH (1 << 12)
58 /* followed define is not in apicdef.h */
59 #define APIC_SHORT_MASK 0xc0000
60 #define APIC_DEST_NOSHORT 0x0
61 #define APIC_DEST_MASK 0x800
62 #define MAX_APIC_VECTOR 256
64 #define VEC_POS(v) ((v) & (32 - 1))
65 #define REG_POS(v) (((v) >> 5) << 4)
67 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
69 return *((u32 *) (apic->regs + reg_off));
72 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
74 *((u32 *) (apic->regs + reg_off)) = val;
77 static inline int apic_test_and_set_vector(int vec, void *bitmap)
79 return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
82 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
84 return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
87 static inline void apic_set_vector(int vec, void *bitmap)
89 set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
92 static inline void apic_clear_vector(int vec, void *bitmap)
94 clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
97 static inline int apic_hw_enabled(struct kvm_lapic *apic)
99 return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
102 static inline int apic_sw_enabled(struct kvm_lapic *apic)
104 return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
107 static inline int apic_enabled(struct kvm_lapic *apic)
109 return apic_sw_enabled(apic) && apic_hw_enabled(apic);
113 (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
116 (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
117 APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
119 static inline int kvm_apic_id(struct kvm_lapic *apic)
121 return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
124 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
126 return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
129 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
131 return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
134 static inline int apic_lvtt_period(struct kvm_lapic *apic)
136 return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
139 static inline int apic_lvt_nmi_mode(u32 lvt_val)
141 return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
144 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
145 LVT_MASK | APIC_LVT_TIMER_PERIODIC, /* LVTT */
146 LVT_MASK | APIC_MODE_MASK, /* LVTTHMR */
147 LVT_MASK | APIC_MODE_MASK, /* LVTPC */
148 LINT_MASK, LINT_MASK, /* LVT0-1 */
149 LVT_MASK /* LVTERR */
152 static int find_highest_vector(void *bitmap)
155 int word_offset = MAX_APIC_VECTOR >> 5;
157 while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
160 if (likely(!word_offset && !word[0]))
163 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
166 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
168 return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
171 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
173 apic_clear_vector(vec, apic->regs + APIC_IRR);
176 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
180 result = find_highest_vector(apic->regs + APIC_IRR);
181 ASSERT(result == -1 || result >= 16);
186 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
188 struct kvm_lapic *apic = vcpu->arch.apic;
193 highest_irr = apic_find_highest_irr(apic);
198 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
199 int vector, int level, int trig_mode);
201 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
203 struct kvm_lapic *apic = vcpu->arch.apic;
205 return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
206 irq->level, irq->trig_mode);
209 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
213 result = find_highest_vector(apic->regs + APIC_ISR);
214 ASSERT(result == -1 || result >= 16);
219 static void apic_update_ppr(struct kvm_lapic *apic)
224 tpr = apic_get_reg(apic, APIC_TASKPRI);
225 isr = apic_find_highest_isr(apic);
226 isrv = (isr != -1) ? isr : 0;
228 if ((tpr & 0xf0) >= (isrv & 0xf0))
233 apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
234 apic, ppr, isr, isrv);
236 apic_set_reg(apic, APIC_PROCPRI, ppr);
239 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
241 apic_set_reg(apic, APIC_TASKPRI, tpr);
242 apic_update_ppr(apic);
245 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
247 return dest == 0xff || kvm_apic_id(apic) == dest;
250 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
255 logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
257 switch (apic_get_reg(apic, APIC_DFR)) {
259 if (logical_id & mda)
262 case APIC_DFR_CLUSTER:
263 if (((logical_id >> 4) == (mda >> 0x4))
264 && (logical_id & mda & 0xf))
268 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
269 apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
276 int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
277 int short_hand, int dest, int dest_mode)
280 struct kvm_lapic *target = vcpu->arch.apic;
282 apic_debug("target %p, source %p, dest 0x%x, "
283 "dest_mode 0x%x, short_hand 0x%x\n",
284 target, source, dest, dest_mode, short_hand);
287 switch (short_hand) {
288 case APIC_DEST_NOSHORT:
291 result = kvm_apic_match_physical_addr(target, dest);
294 result = kvm_apic_match_logical_addr(target, dest);
297 result = (target == source);
299 case APIC_DEST_ALLINC:
302 case APIC_DEST_ALLBUT:
303 result = (target != source);
306 printk(KERN_WARNING "Bad dest shorthand value %x\n",
315 * Add a pending IRQ into lapic.
316 * Return 1 if successfully added and 0 if discarded.
318 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
319 int vector, int level, int trig_mode)
322 struct kvm_vcpu *vcpu = apic->vcpu;
324 switch (delivery_mode) {
326 vcpu->arch.apic_arb_prio++;
328 /* FIXME add logic for vcpu on reset */
329 if (unlikely(!apic_enabled(apic)))
332 result = !apic_test_and_set_irr(vector, apic);
335 apic_debug("level trig mode repeatedly for "
336 "vector %d", vector);
341 apic_debug("level trig mode for vector %d", vector);
342 apic_set_vector(vector, apic->regs + APIC_TMR);
344 apic_clear_vector(vector, apic->regs + APIC_TMR);
349 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
353 printk(KERN_DEBUG "Ignoring guest SMI\n");
358 kvm_inject_nmi(vcpu);
365 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
367 "INIT on a runnable vcpu %d\n",
369 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
372 apic_debug("Ignoring de-assert INIT to vcpu %d\n",
377 case APIC_DM_STARTUP:
378 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
379 vcpu->vcpu_id, vector);
380 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
382 vcpu->arch.sipi_vector = vector;
383 vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
390 * Should only be called by kvm_apic_local_deliver() with LVT0,
391 * before NMI watchdog was enabled. Already handled by
392 * kvm_apic_accept_pic_intr().
397 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
404 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
406 return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
409 static void apic_set_eoi(struct kvm_lapic *apic)
411 int vector = apic_find_highest_isr(apic);
414 * Not every write EOI will has corresponding ISR,
415 * one example is when Kernel check timer on setup_IO_APIC
420 apic_clear_vector(vector, apic->regs + APIC_ISR);
421 apic_update_ppr(apic);
423 if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
424 trigger_mode = IOAPIC_LEVEL_TRIG;
426 trigger_mode = IOAPIC_EDGE_TRIG;
427 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
430 static void apic_send_ipi(struct kvm_lapic *apic)
432 u32 icr_low = apic_get_reg(apic, APIC_ICR);
433 u32 icr_high = apic_get_reg(apic, APIC_ICR2);
434 struct kvm_lapic_irq irq;
436 irq.vector = icr_low & APIC_VECTOR_MASK;
437 irq.delivery_mode = icr_low & APIC_MODE_MASK;
438 irq.dest_mode = icr_low & APIC_DEST_MASK;
439 irq.level = icr_low & APIC_INT_ASSERT;
440 irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
441 irq.shorthand = icr_low & APIC_SHORT_MASK;
442 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
444 apic_debug("icr_high 0x%x, icr_low 0x%x, "
445 "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
446 "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
447 icr_high, icr_low, irq.shorthand, irq.dest_id,
448 irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
451 kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
454 static u32 apic_get_tmcct(struct kvm_lapic *apic)
460 ASSERT(apic != NULL);
462 /* if initial count is 0, current count should also be 0 */
463 if (apic_get_reg(apic, APIC_TMICT) == 0)
466 remaining = hrtimer_expires_remaining(&apic->lapic_timer.timer);
467 if (ktime_to_ns(remaining) < 0)
468 remaining = ktime_set(0, 0);
470 ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
471 tmcct = div64_u64(ns,
472 (APIC_BUS_CYCLE_NS * apic->divide_count));
477 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
479 struct kvm_vcpu *vcpu = apic->vcpu;
480 struct kvm_run *run = vcpu->run;
482 set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests);
483 run->tpr_access.rip = kvm_rip_read(vcpu);
484 run->tpr_access.is_write = write;
487 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
489 if (apic->vcpu->arch.tpr_access_reporting)
490 __report_tpr_access(apic, write);
493 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
497 KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
499 if (offset >= LAPIC_MMIO_LENGTH)
504 printk(KERN_WARNING "Access APIC ARBPRI register "
505 "which is for P6\n");
508 case APIC_TMCCT: /* Timer CCR */
509 val = apic_get_tmcct(apic);
513 report_tpr_access(apic, false);
516 apic_update_ppr(apic);
517 val = apic_get_reg(apic, offset);
524 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
526 return container_of(dev, struct kvm_lapic, dev);
529 static void apic_mmio_read(struct kvm_io_device *this,
530 gpa_t address, int len, void *data)
532 struct kvm_lapic *apic = to_lapic(this);
533 unsigned int offset = address - apic->base_address;
534 unsigned char alignment = offset & 0xf;
537 if ((alignment + len) > 4) {
538 printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
539 (unsigned long)address, len);
542 result = __apic_read(apic, offset & ~0xf);
548 memcpy(data, (char *)&result + alignment, len);
551 printk(KERN_ERR "Local APIC read with len = %x, "
552 "should be 1,2, or 4 instead\n", len);
557 static void update_divide_count(struct kvm_lapic *apic)
559 u32 tmp1, tmp2, tdcr;
561 tdcr = apic_get_reg(apic, APIC_TDCR);
563 tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
564 apic->divide_count = 0x1 << (tmp2 & 0x7);
566 apic_debug("timer divide count is 0x%x\n",
570 static void start_apic_timer(struct kvm_lapic *apic)
572 ktime_t now = apic->lapic_timer.timer.base->get_time();
574 apic->lapic_timer.period = apic_get_reg(apic, APIC_TMICT) *
575 APIC_BUS_CYCLE_NS * apic->divide_count;
576 atomic_set(&apic->lapic_timer.pending, 0);
578 if (!apic->lapic_timer.period)
581 hrtimer_start(&apic->lapic_timer.timer,
582 ktime_add_ns(now, apic->lapic_timer.period),
585 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
587 "timer initial count 0x%x, period %lldns, "
588 "expire @ 0x%016" PRIx64 ".\n", __func__,
589 APIC_BUS_CYCLE_NS, ktime_to_ns(now),
590 apic_get_reg(apic, APIC_TMICT),
591 apic->lapic_timer.period,
592 ktime_to_ns(ktime_add_ns(now,
593 apic->lapic_timer.period)));
596 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
598 int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
600 if (apic_lvt_nmi_mode(lvt0_val)) {
601 if (!nmi_wd_enabled) {
602 apic_debug("Receive NMI setting on APIC_LVT0 "
603 "for cpu %d\n", apic->vcpu->vcpu_id);
604 apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
606 } else if (nmi_wd_enabled)
607 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
610 static void apic_mmio_write(struct kvm_io_device *this,
611 gpa_t address, int len, const void *data)
613 struct kvm_lapic *apic = to_lapic(this);
614 unsigned int offset = address - apic->base_address;
615 unsigned char alignment = offset & 0xf;
619 * APIC register must be aligned on 128-bits boundary.
620 * 32/64/128 bits registers must be accessed thru 32 bits.
623 if (len != 4 || alignment) {
624 /* Don't shout loud, $infamous_os would cause only noise. */
625 apic_debug("apic write: bad size=%d %lx\n",
632 /* too common printing */
633 if (offset != APIC_EOI)
634 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
635 "0x%x\n", __func__, offset, len, val);
639 KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
642 case APIC_ID: /* Local APIC ID */
643 apic_set_reg(apic, APIC_ID, val);
647 report_tpr_access(apic, true);
648 apic_set_tpr(apic, val & 0xff);
656 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
660 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
664 apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
665 if (!(val & APIC_SPIV_APIC_ENABLED)) {
669 for (i = 0; i < APIC_LVT_NUM; i++) {
670 lvt_val = apic_get_reg(apic,
671 APIC_LVTT + 0x10 * i);
672 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
673 lvt_val | APIC_LVT_MASKED);
675 atomic_set(&apic->lapic_timer.pending, 0);
681 /* No delay here, so we always clear the pending bit */
682 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
687 apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
691 apic_manage_nmi_watchdog(apic, val);
697 /* TODO: Check vector */
698 if (!apic_sw_enabled(apic))
699 val |= APIC_LVT_MASKED;
701 val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
702 apic_set_reg(apic, offset, val);
707 hrtimer_cancel(&apic->lapic_timer.timer);
708 apic_set_reg(apic, APIC_TMICT, val);
709 start_apic_timer(apic);
714 printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
715 apic_set_reg(apic, APIC_TDCR, val);
716 update_divide_count(apic);
720 apic_debug("Local APIC Write to read-only register %x\n",
727 static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
730 struct kvm_lapic *apic = to_lapic(this);
734 if (apic_hw_enabled(apic) &&
735 (addr >= apic->base_address) &&
736 (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
742 void kvm_free_lapic(struct kvm_vcpu *vcpu)
744 if (!vcpu->arch.apic)
747 hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer);
749 if (vcpu->arch.apic->regs_page)
750 __free_page(vcpu->arch.apic->regs_page);
752 kfree(vcpu->arch.apic);
756 *----------------------------------------------------------------------
758 *----------------------------------------------------------------------
761 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
763 struct kvm_lapic *apic = vcpu->arch.apic;
767 apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
768 | (apic_get_reg(apic, APIC_TASKPRI) & 4));
771 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
773 struct kvm_lapic *apic = vcpu->arch.apic;
778 tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
780 return (tpr & 0xf0) >> 4;
783 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
785 struct kvm_lapic *apic = vcpu->arch.apic;
788 value |= MSR_IA32_APICBASE_BSP;
789 vcpu->arch.apic_base = value;
792 if (apic->vcpu->vcpu_id)
793 value &= ~MSR_IA32_APICBASE_BSP;
795 vcpu->arch.apic_base = value;
796 apic->base_address = apic->vcpu->arch.apic_base &
797 MSR_IA32_APICBASE_BASE;
799 /* with FSB delivery interrupt, we can restart APIC functionality */
800 apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
801 "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
805 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
807 struct kvm_lapic *apic;
810 apic_debug("%s\n", __func__);
813 apic = vcpu->arch.apic;
814 ASSERT(apic != NULL);
816 /* Stop the timer in case it's a reset to an active apic */
817 hrtimer_cancel(&apic->lapic_timer.timer);
819 apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
820 apic_set_reg(apic, APIC_LVR, APIC_VERSION);
822 for (i = 0; i < APIC_LVT_NUM; i++)
823 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
824 apic_set_reg(apic, APIC_LVT0,
825 SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
827 apic_set_reg(apic, APIC_DFR, 0xffffffffU);
828 apic_set_reg(apic, APIC_SPIV, 0xff);
829 apic_set_reg(apic, APIC_TASKPRI, 0);
830 apic_set_reg(apic, APIC_LDR, 0);
831 apic_set_reg(apic, APIC_ESR, 0);
832 apic_set_reg(apic, APIC_ICR, 0);
833 apic_set_reg(apic, APIC_ICR2, 0);
834 apic_set_reg(apic, APIC_TDCR, 0);
835 apic_set_reg(apic, APIC_TMICT, 0);
836 for (i = 0; i < 8; i++) {
837 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
838 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
839 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
841 update_divide_count(apic);
842 atomic_set(&apic->lapic_timer.pending, 0);
843 if (vcpu->vcpu_id == 0)
844 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
845 apic_update_ppr(apic);
847 vcpu->arch.apic_arb_prio = 0;
849 apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
850 "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
851 vcpu, kvm_apic_id(apic),
852 vcpu->arch.apic_base, apic->base_address);
855 bool kvm_apic_present(struct kvm_vcpu *vcpu)
857 return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
860 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
862 return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
866 *----------------------------------------------------------------------
868 *----------------------------------------------------------------------
871 static bool lapic_is_periodic(struct kvm_timer *ktimer)
873 struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic,
875 return apic_lvtt_period(apic);
878 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
880 struct kvm_lapic *lapic = vcpu->arch.apic;
882 if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
883 return atomic_read(&lapic->lapic_timer.pending);
888 static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
890 u32 reg = apic_get_reg(apic, lvt_type);
891 int vector, mode, trig_mode;
893 if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
894 vector = reg & APIC_VECTOR_MASK;
895 mode = reg & APIC_MODE_MASK;
896 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
897 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
902 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
904 struct kvm_lapic *apic = vcpu->arch.apic;
907 kvm_apic_local_deliver(apic, APIC_LVT0);
910 static struct kvm_timer_ops lapic_timer_ops = {
911 .is_periodic = lapic_is_periodic,
914 static const struct kvm_io_device_ops apic_mmio_ops = {
915 .read = apic_mmio_read,
916 .write = apic_mmio_write,
917 .in_range = apic_mmio_range,
920 int kvm_create_lapic(struct kvm_vcpu *vcpu)
922 struct kvm_lapic *apic;
924 ASSERT(vcpu != NULL);
925 apic_debug("apic_init %d\n", vcpu->vcpu_id);
927 apic = kzalloc(sizeof(*apic), GFP_KERNEL);
931 vcpu->arch.apic = apic;
933 apic->regs_page = alloc_page(GFP_KERNEL);
934 if (apic->regs_page == NULL) {
935 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
937 goto nomem_free_apic;
939 apic->regs = page_address(apic->regs_page);
940 memset(apic->regs, 0, PAGE_SIZE);
943 hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
945 apic->lapic_timer.timer.function = kvm_timer_fn;
946 apic->lapic_timer.t_ops = &lapic_timer_ops;
947 apic->lapic_timer.kvm = vcpu->kvm;
948 apic->lapic_timer.vcpu_id = vcpu->vcpu_id;
950 apic->base_address = APIC_DEFAULT_PHYS_BASE;
951 vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
953 kvm_lapic_reset(vcpu);
954 kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
963 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
965 struct kvm_lapic *apic = vcpu->arch.apic;
968 if (!apic || !apic_enabled(apic))
971 apic_update_ppr(apic);
972 highest_irr = apic_find_highest_irr(apic);
973 if ((highest_irr == -1) ||
974 ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
979 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
981 u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
984 if (vcpu->vcpu_id == 0) {
985 if (!apic_hw_enabled(vcpu->arch.apic))
987 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
988 GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
994 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
996 struct kvm_lapic *apic = vcpu->arch.apic;
998 if (apic && atomic_read(&apic->lapic_timer.pending) > 0) {
999 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1000 atomic_dec(&apic->lapic_timer.pending);
1004 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1006 int vector = kvm_apic_has_interrupt(vcpu);
1007 struct kvm_lapic *apic = vcpu->arch.apic;
1012 apic_set_vector(vector, apic->regs + APIC_ISR);
1013 apic_update_ppr(apic);
1014 apic_clear_irr(vector, apic);
1018 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1020 struct kvm_lapic *apic = vcpu->arch.apic;
1022 apic->base_address = vcpu->arch.apic_base &
1023 MSR_IA32_APICBASE_BASE;
1024 apic_set_reg(apic, APIC_LVR, APIC_VERSION);
1025 apic_update_ppr(apic);
1026 hrtimer_cancel(&apic->lapic_timer.timer);
1027 update_divide_count(apic);
1028 start_apic_timer(apic);
1031 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1033 struct kvm_lapic *apic = vcpu->arch.apic;
1034 struct hrtimer *timer;
1039 timer = &apic->lapic_timer.timer;
1040 if (hrtimer_cancel(timer))
1041 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1044 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1049 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1052 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1053 data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1054 kunmap_atomic(vapic, KM_USER0);
1056 apic_set_tpr(vcpu->arch.apic, data & 0xff);
1059 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1062 int max_irr, max_isr;
1063 struct kvm_lapic *apic;
1066 if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1069 apic = vcpu->arch.apic;
1070 tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1071 max_irr = apic_find_highest_irr(apic);
1074 max_isr = apic_find_highest_isr(apic);
1077 data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1079 vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1080 *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1081 kunmap_atomic(vapic, KM_USER0);
1084 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1086 if (!irqchip_in_kernel(vcpu->kvm))
1089 vcpu->arch.apic->vapic_addr = vapic_addr;