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kvm_lapic.c
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kvm_lapic.c
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/*
* 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.
*
* Copyright 2011 Joyent, Inc. All rights reserved.
*/
#include <sys/types.h>
#include <sys/atomic.h>
#include "kvm_bitops.h"
#include "kvm_msr.h"
#include "kvm_apicdef.h"
#include "kvm_cpuid.h"
#include "kvm_x86host.h"
#include "kvm_x86impl.h"
#include "kvm_lapic.h"
#include "kvm_ioapic.h"
#include "kvm_irq.h"
static int __apic_accept_irq(struct kvm_lapic *, int, int, int, int);
#define APIC_BUS_CYCLE_NS 1
#define APIC_LDR 0xD0
#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 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)
#define VEC_POS(v) ((v) & (32 - 1))
#define REG_POS(v) (((v) >> 5) << 4)
inline uint32_t
apic_get_reg(struct kvm_lapic *apic, int reg_off)
{
return (*((uint32_t *)((uintptr_t)apic->regs + reg_off)));
}
void
apic_set_reg(struct kvm_lapic *apic, int reg_off, uint32_t val)
{
*((uint32_t *)((uintptr_t)apic->regs + reg_off)) = val;
}
static inline int
apic_test_and_set_vector(int vec, caddr_t bitmap)
{
return (test_and_set_bit(VEC_POS(vec), (unsigned long *)(bitmap +
REG_POS(vec))));
}
static inline int
apic_test_and_clear_vector(int vec, caddr_t bitmap)
{
return (test_and_clear_bit(VEC_POS(vec),
(unsigned long *)(bitmap + REG_POS(vec))));
}
inline void
apic_set_vector(int vec, caddr_t bitmap)
{
set_bit(VEC_POS(vec), (unsigned long *)(bitmap + REG_POS(vec)));
}
inline void
apic_clear_vector(int vec, caddr_t bitmap)
{
clear_bit(VEC_POS(vec), (unsigned long *)(bitmap + REG_POS(vec)));
}
inline int
apic_hw_enabled(struct kvm_lapic *apic)
{
return ((apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE);
}
inline int
apic_sw_enabled(struct kvm_lapic *apic)
{
return (apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED);
}
inline int
apic_enabled(struct kvm_lapic *apic)
{
return (apic_sw_enabled(apic) && apic_hw_enabled(apic));
}
int
kvm_apic_id(struct kvm_lapic *apic)
{
return ((apic_get_reg(apic, APIC_ID) >> 24) & 0xff);
}
static int
apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
{
return (!(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED));
}
static 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(uint32_t 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;
uint32_t 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
fls(int x)
{
int r = 32;
if (!x)
return (0);
if (!(x & 0xffff0000u)) {
x <<= 16;
r -= 16;
}
if (!(x & 0xff000000u)) {
x <<= 8;
r -= 8;
}
if (!(x & 0xf0000000u)) {
x <<= 4;
r -= 4;
}
if (!(x & 0xc0000000u)) {
x <<= 2;
r -= 2;
}
if (!(x & 0x80000000u)) {
x <<= 1;
r -= 1;
}
return (r);
}
static int
find_highest_vector(void *bitmap)
{
uint32_t *word = bitmap;
int word_offset = MAX_APIC_VECTOR >> 5;
while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
continue;
if (!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 = 1;
return (apic_test_and_set_vector(vec, (void *)((uintptr_t)apic->regs +
APIC_IRR)));
}
static inline int
apic_search_irr(struct kvm_lapic *apic)
{
return (find_highest_vector((void *)((uintptr_t)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 = 0;
apic_clear_vector(vec, (void *)((uintptr_t)apic->regs + APIC_IRR));
if (apic_search_irr(apic) != -1)
apic->irr_pending = 1;
}
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);
}
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));
}
inline int
apic_find_highest_isr(struct kvm_lapic *apic)
{
int ret;
ret = find_highest_vector((void *)((uintptr_t)apic->regs + APIC_ISR));
ASSERT(ret == -1 || ret >= 16);
return (ret);
}
void
apic_update_ppr(struct kvm_lapic *apic)
{
uint32_t 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_set_reg(apic, APIC_PROCPRI, ppr);
}
void
apic_set_tpr(struct kvm_lapic *apic, uint32_t tpr)
{
apic_set_reg(apic, APIC_TASKPRI, tpr);
apic_update_ppr(apic);
}
int
kvm_apic_match_physical_addr(struct kvm_lapic *apic, uint16_t dest)
{
return (dest == 0xff || kvm_apic_id(apic) == dest);
}
int
kvm_apic_match_logical_addr(struct kvm_lapic *apic, uint8_t mda)
{
int result = 0;
uint32_t 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:
cmn_err(CE_WARN, "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;
ASSERT(target != NULL);
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:
cmn_err(CE_WARN, "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 (!apic_enabled(apic))
break;
if (trig_mode) {
apic_set_vector(vector, (void *)((uintptr_t)apic->regs +
APIC_TMR));
} else
apic_clear_vector(vector,
(void *)((uintptr_t)apic->regs + APIC_TMR));
result = !apic_test_and_set_irr(vector, apic);
if (!result) {
break;
}
kvm_vcpu_kick(vcpu);
break;
case APIC_DM_REMRD:
break;
case APIC_DM_SMI:
break;
case APIC_DM_NMI:
result = 1;
kvm_inject_nmi(vcpu);
kvm_vcpu_kick(vcpu);
break;
case APIC_DM_INIT:
if (level) {
result = 1;
vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
kvm_vcpu_kick(vcpu);
}
break;
case APIC_DM_STARTUP:
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:
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, (void *)((uintptr_t)apic->regs + APIC_ISR));
apic_update_ppr(apic);
if (apic_test_and_clear_vector(vector, (void *)((uintptr_t)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))
kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
}
static void
apic_send_ipi(struct kvm_lapic *apic)
{
uint32_t icr_low = apic_get_reg(apic, APIC_ICR);
uint32_t 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);
KVM_TRACE2(apic__ipi, uint32_t, icr_low, uint32_t, irq.dest_id);
kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
}
static uint32_t
apic_get_tmcct(struct kvm_lapic *apic)
{
hrtime_t now, remaining, elapsed;
uint32_t tmcct;
VERIFY(apic != NULL);
/* if initial count is 0, current count should also be 0 */
if (apic_get_reg(apic, APIC_TMICT) == 0)
return (0);
now = gethrtime();
elapsed = now - apic->lapic_timer.start -
apic->lapic_timer.period * apic->lapic_timer.intervals;
remaining = apic->lapic_timer.period - elapsed;
if (remaining < 0)
remaining = 0;
remaining = remaining % apic->lapic_timer.period;
tmcct = remaining / (APIC_BUS_CYCLE_NS * apic->divide_count);
return (tmcct);
}
static void
__report_tpr_access(struct kvm_lapic *apic, int 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, int write)
{
if (apic->vcpu->arch.tpr_access_reporting)
__report_tpr_access(apic, write);
}
static uint32_t
__apic_read(struct kvm_lapic *apic, unsigned int offset)
{
uint32_t 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:
cmn_err(CE_WARN, "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, 0);
/* 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 ((struct kvm_lapic *)((uintptr_t)dev -
offsetof(struct kvm_lapic, dev)));
}
int
apic_reg_read(struct kvm_lapic *apic, uint32_t offset, int len, void *data)
{
unsigned char alignment = offset & 0xf;
uint32_t result;
/* this bitmask has a bit cleared for each reserver register */
static const uint64_t rmask = 0x43ff01ffffffe70cULL;
if ((alignment + len) > 4) {
return (1);
}
if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
return (1);
}
result = __apic_read(apic, offset & ~0xf);
KVM_TRACE2(apic__read, uint32_t, offset, uint32_t, result);
switch (len) {
case 1:
case 2:
case 4:
memcpy(data, (char *)&result + alignment, len);
break;
default:
cmn_err(CE_WARN, "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);
uint32_t offset = address - apic->base_address;
if (!apic_mmio_in_range(apic, address))
return (-EOPNOTSUPP);
apic_reg_read(apic, offset, len, data);
return (0);
}
void
update_divide_count(struct kvm_lapic *apic)
{
uint32_t 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);
}
void
start_apic_timer(struct kvm_lapic *apic)
{
hrtime_t now = gethrtime(), when;
struct kvm_timer *timer = &apic->lapic_timer;
timer->period = (uint64_t)apic_get_reg(apic, APIC_TMICT) *
APIC_BUS_CYCLE_NS * apic->divide_count;
if (timer->active) {
if (timer->period != 0 && !apic_lvtt_period(apic) &&
timer->kvm_cyc_when.cyt_interval == CY_INFINITY) {
/*
* If we were a one-shot timer and we remain a
* one-shot timer, we will cyclic_reprogram() instead
* of horsing around with removing and re-adding
* the cyclic.
*/
timer->start = gethrtime();
timer->kvm_cyc_when.cyt_when = when =
timer->start + timer->period;
timer->intervals = 0;
cyclic_reprogram(timer->kvm_cyclic_id, when);
return;
}
mutex_enter(&cpu_lock);
cyclic_remove(timer->kvm_cyclic_id);
timer->active = 0;
mutex_exit(&cpu_lock);
}
if (!timer->period)
return;
mutex_enter(&cpu_lock);
timer->start = gethrtime();
/*
* Do not allow the guest to program periodic timers with small
* interval, since the hrtimers are not throttled by the host
* scheduler.
*
* If it is a one shot, we want to program it differently.
*/
if (apic_lvtt_period(apic)) {
if (timer->period < NSEC_PER_MSEC / 2)
timer->period = NSEC_PER_MSEC / 2;
timer->kvm_cyc_when.cyt_when = 0;
timer->kvm_cyc_when.cyt_interval = timer->period;
} else {
timer->kvm_cyc_when.cyt_when = timer->start + timer->period;
timer->kvm_cyc_when.cyt_interval = CY_INFINITY;
}
timer->kvm_cyclic_id =
cyclic_add(&timer->kvm_cyc_handler, &timer->kvm_cyc_when);
timer->active = 1;
timer->intervals = 0;
mutex_exit(&cpu_lock);
}
static void
apic_manage_nmi_watchdog(struct kvm_lapic *apic, uint32_t 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->vcpu->kvm->arch.vapics_in_nmi_mode++;
} else if (nmi_wd_enabled)
apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
}
int
apic_reg_write(struct kvm_lapic *apic, uint32_t reg, uint32_t val)
{
int ret = 0;
KVM_TRACE2(apic__write, uint32_t, reg, uint32_t, 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, 1);
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: {
uint32_t 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;
uint32_t 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);
}
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:
apic_set_reg(apic, APIC_TMICT, val);
start_apic_timer(apic);
break;
case APIC_TDCR:
if (val & 4)
cmn_err(CE_WARN, "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) {
cmn_err(CE_WARN, "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;
}
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;
uint32_t 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. */
return (0);
}
val = *(uint32_t *)data;
apic_reg_write(apic, offset & 0xff0, val);
return (0);
}
void
kvm_free_lapic(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
if (apic == NULL)
return;
mutex_enter(&cpu_lock);
if (apic->lapic_timer.active)
cyclic_remove(apic->lapic_timer.kvm_cyclic_id);
mutex_exit(&cpu_lock);
if (apic->regs)
kmem_free(apic->regs, PAGESIZE);
kmem_free(vcpu->arch.apic, sizeof (struct kvm_lapic));
}
/*
* Local APIC 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));
}
uint64_t
kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
uint64_t tpr;
if (apic == NULL)
return (0);
tpr = (uint64_t)apic_get_reg(apic, APIC_TASKPRI);
return ((tpr & 0xf0) >> 4);
}
void
kvm_lapic_set_base(struct kvm_vcpu *vcpu, uint64_t 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)) {
uint32_t id = kvm_apic_id(apic);
uint32_t 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;
}
void
kvm_lapic_reset(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic;
int i;
ASSERT(vcpu);
apic = vcpu->arch.apic;
ASSERT(apic != NULL);
/* Stop the timer in case it's a reset to an active apic */
mutex_enter(&cpu_lock);
if (apic->lapic_timer.active) {
cyclic_remove(apic->lapic_timer.kvm_cyclic_id);
apic->lapic_timer.active = 0;
}
mutex_exit(&cpu_lock);
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);