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b33ac88b4c
linux/drivers/kvm/lapic.c
Kevin Pedretti b33ac88b4c KVM: Fix local apic timer divide by zero 
kvm_lapic_reset() was initializing apic->timer.divide_count to 0,
which could potentially lead to a divide by zero error in
apic_get_tmcct().  Any guest that reads the APIC's CCR (current count)
register before setting DCR (divide configuration) would trigger a divide
by zero exception in the host kernel, leading to a host-OS crash.

This patch results in apic->timer.divide_count being initialized to
2 at reset, eliminating the bug (DCR=0 at reset, meaning divide by 2).

Signed-off-by: Kevin Pedretti <kevin.pedretti@gmail.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-10-22 12:03:29 +02:00

1065 lines
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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.
*/
#include "kvm.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 <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/div64.h>
#include "irq.h"
#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->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 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)
{
return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
}
static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
{
apic_clear_vector(vec, apic->regs + APIC_IRR);
}
static inline int apic_find_highest_irr(struct kvm_lapic *apic)
{
int result;
result = find_highest_vector(apic->regs + APIC_IRR);
ASSERT(result == -1 || result >= 16);
return result;
}
int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
int highest_irr;
if (!apic)
return 0;
highest_irr = apic_find_highest_irr(apic);
return highest_irr;
}
EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
int kvm_apic_set_irq(struct kvm_lapic *apic, u8 vec, u8 trig)
{
if (!apic_test_and_set_irr(vec, apic)) {
/* a new pending irq is set in IRR */
if (trig)
apic_set_vector(vec, apic->regs + APIC_TMR);
else
apic_clear_vector(vec, apic->regs + APIC_TMR);
kvm_vcpu_kick(apic->vcpu);
return 1;
}
return 0;
}
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 kvm_apic_id(apic) == dest;
}
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
{
int result = 0;
u8 logical_id;
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;
}
static int 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->apic;
apic_debug("target %p, source %p, dest 0x%x, "
"dest_mode 0x%x, short_hand 0x%x",
target, source, dest, dest_mode, short_hand);
ASSERT(!target);
switch (short_hand) {
case APIC_DEST_NOSHORT:
if (dest_mode == 0) {
/* Physical mode. */
if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
result = 1;
} else
/* Logical mode. */
result = kvm_apic_match_logical_addr(target, dest);
break;
case APIC_DEST_SELF:
if (target == source)
result = 1;
break;
case APIC_DEST_ALLINC:
result = 1;
break;
case APIC_DEST_ALLBUT:
if (target != source)
result = 1;
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 orig_irr, result = 0;
struct kvm_vcpu *vcpu = apic->vcpu;
switch (delivery_mode) {
case APIC_DM_FIXED:
case APIC_DM_LOWEST:
/* FIXME add logic for vcpu on reset */
if (unlikely(!apic_enabled(apic)))
break;
orig_irr = apic_test_and_set_irr(vector, apic);
if (orig_irr && 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);
if (vcpu->mp_state == VCPU_MP_STATE_RUNNABLE)
kvm_vcpu_kick(vcpu);
else if (vcpu->mp_state == VCPU_MP_STATE_HALTED) {
vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
if (waitqueue_active(&vcpu->wq))
wake_up_interruptible(&vcpu->wq);
}
result = (orig_irr == 0);
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:
printk(KERN_DEBUG "Ignoring guest NMI\n");
break;
case APIC_DM_INIT:
if (level) {
if (vcpu->mp_state == VCPU_MP_STATE_RUNNABLE)
printk(KERN_DEBUG
"INIT on a runnable vcpu %d\n",
vcpu->vcpu_id);
vcpu->mp_state = VCPU_MP_STATE_INIT_RECEIVED;
kvm_vcpu_kick(vcpu);
} else {
printk(KERN_DEBUG
"Ignoring de-assert INIT to vcpu %d\n",
vcpu->vcpu_id);
}
break;
case APIC_DM_STARTUP:
printk(KERN_DEBUG "SIPI to vcpu %d vector 0x%02x\n",
vcpu->vcpu_id, vector);
if (vcpu->mp_state == VCPU_MP_STATE_INIT_RECEIVED) {
vcpu->sipi_vector = vector;
vcpu->mp_state = VCPU_MP_STATE_SIPI_RECEIVED;
if (waitqueue_active(&vcpu->wq))
wake_up_interruptible(&vcpu->wq);
}
break;
default:
printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
delivery_mode);
break;
}
return result;
}
struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
unsigned long bitmap)
{
int vcpu_id;
int last;
int next;
struct kvm_lapic *apic;
last = kvm->round_robin_prev_vcpu;
next = last;
do {
if (++next == KVM_MAX_VCPUS)
next = 0;
if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
continue;
apic = kvm->vcpus[next]->apic;
if (apic && apic_enabled(apic))
break;
apic = NULL;
} while (next != last);
kvm->round_robin_prev_vcpu = next;
if (!apic) {
vcpu_id = ffs(bitmap) - 1;
if (vcpu_id < 0) {
vcpu_id = 0;
printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
}
apic = kvm->vcpus[vcpu_id]->apic;
}
return apic;
}
static void apic_set_eoi(struct kvm_lapic *apic)
{
int vector = apic_find_highest_isr(apic);
/*
* 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))
kvm_ioapic_update_eoi(apic->vcpu->kvm, vector);
}
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);
unsigned int dest = GET_APIC_DEST_FIELD(icr_high);
unsigned int short_hand = icr_low & APIC_SHORT_MASK;
unsigned int trig_mode = icr_low & APIC_INT_LEVELTRIG;
unsigned int level = icr_low & APIC_INT_ASSERT;
unsigned int dest_mode = icr_low & APIC_DEST_MASK;
unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
unsigned int vector = icr_low & APIC_VECTOR_MASK;
struct kvm_lapic *target;
struct kvm_vcpu *vcpu;
unsigned long lpr_map = 0;
int i;
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, short_hand, dest,
trig_mode, level, dest_mode, delivery_mode, vector);
for (i = 0; i < KVM_MAX_VCPUS; i++) {
vcpu = apic->vcpu->kvm->vcpus[i];
if (!vcpu)
continue;
if (vcpu->apic &&
apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
if (delivery_mode == APIC_DM_LOWEST)
set_bit(vcpu->vcpu_id, &lpr_map);
else
__apic_accept_irq(vcpu->apic, delivery_mode,
vector, level, trig_mode);
}
}
if (delivery_mode == APIC_DM_LOWEST) {
target = kvm_apic_round_robin(vcpu->kvm, vector, lpr_map);
if (target != NULL)
__apic_accept_irq(target, delivery_mode,
vector, level, trig_mode);
}
}
static u32 apic_get_tmcct(struct kvm_lapic *apic)
{
u32 counter_passed;
ktime_t passed, now = apic->timer.dev.base->get_time();
u32 tmcct = apic_get_reg(apic, APIC_TMICT);
ASSERT(apic != NULL);
if (unlikely(ktime_to_ns(now) <=
ktime_to_ns(apic->timer.last_update))) {
/* Wrap around */
passed = ktime_add(( {
(ktime_t) {
.tv64 = KTIME_MAX -
(apic->timer.last_update).tv64}; }
), now);
apic_debug("time elapsed\n");
} else
passed = ktime_sub(now, apic->timer.last_update);
counter_passed = div64_64(ktime_to_ns(passed),
(APIC_BUS_CYCLE_NS * apic->timer.divide_count));
tmcct -= counter_passed;
if (tmcct <= 0) {
if (unlikely(!apic_lvtt_period(apic)))
tmcct = 0;
else
do {
tmcct += apic_get_reg(apic, APIC_TMICT);
} while (tmcct <= 0);
}
return tmcct;
}
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_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;
default:
apic_update_ppr(apic);
val = apic_get_reg(apic, offset);
break;
}
return val;
}
static void apic_mmio_read(struct kvm_io_device *this,
gpa_t address, int len, void *data)
{
struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
unsigned int offset = address - apic->base_address;
unsigned char alignment = offset & 0xf;
u32 result;
if ((alignment + len) > 4) {
printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
(unsigned long)address, len);
return;
}
result = __apic_read(apic, offset & ~0xf);
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;
}
}
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->timer.divide_count = 0x1 << (tmp2 & 0x7);
apic_debug("timer divide count is 0x%x\n",
apic->timer.divide_count);
}
static void start_apic_timer(struct kvm_lapic *apic)
{
ktime_t now = apic->timer.dev.base->get_time();
apic->timer.last_update = now;
apic->timer.period = apic_get_reg(apic, APIC_TMICT) *
APIC_BUS_CYCLE_NS * apic->timer.divide_count;
atomic_set(&apic->timer.pending, 0);
hrtimer_start(&apic->timer.dev,
ktime_add_ns(now, apic->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", __FUNCTION__,
APIC_BUS_CYCLE_NS, ktime_to_ns(now),
apic_get_reg(apic, APIC_TMICT),
apic->timer.period,
ktime_to_ns(ktime_add_ns(now,
apic->timer.period)));
}
static void apic_mmio_write(struct kvm_io_device *this,
gpa_t address, int len, const void *data)
{
struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
unsigned int offset = address - apic->base_address;
unsigned char alignment = offset & 0xf;
u32 val;
/*
* 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 || alignment) {
if (printk_ratelimit())
printk(KERN_ERR "apic write: bad size=%d %lx\n",
len, (long)address);
return;
}
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", __FUNCTION__, offset, len, val);
offset &= 0xff0;
switch (offset) {
case APIC_ID: /* Local APIC ID */
apic_set_reg(apic, APIC_ID, val);
break;
case APIC_TASKPRI:
apic_set_tpr(apic, val & 0xff);
break;
case APIC_EOI:
apic_set_eoi(apic);
break;
case APIC_LDR:
apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
break;
case APIC_DFR:
apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
break;
case APIC_SPIV:
apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
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->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:
apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
break;
case APIC_LVTT:
case APIC_LVTTHMR:
case APIC_LVTPC:
case APIC_LVT0:
case APIC_LVT1:
case APIC_LVTERR:
/* TODO: Check vector */
if (!apic_sw_enabled(apic))
val |= APIC_LVT_MASKED;
val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
apic_set_reg(apic, offset, val);
break;
case APIC_TMICT:
hrtimer_cancel(&apic->timer.dev);
apic_set_reg(apic, APIC_TMICT, val);
start_apic_timer(apic);
return;
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;
default:
apic_debug("Local APIC Write to read-only register %x\n",
offset);
break;
}
}
static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr)
{
struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
int ret = 0;
if (apic_hw_enabled(apic) &&
(addr >= apic->base_address) &&
(addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
ret = 1;
return ret;
}
void kvm_free_apic(struct kvm_lapic *apic)
{
if (!apic)
return;
hrtimer_cancel(&apic->timer.dev);
if (apic->regs_page) {
__free_page(apic->regs_page);
apic->regs_page = 0;
}
kfree(apic);
}
/*
*----------------------------------------------------------------------
* LAPIC interface
*----------------------------------------------------------------------
*/
void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
{
struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
if (!apic)
return;
apic_set_tpr(apic, ((cr8 & 0x0f) << 4));
}
u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
u64 tpr;
if (!apic)
return 0;
tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
return (tpr & 0xf0) >> 4;
}
EXPORT_SYMBOL_GPL(kvm_lapic_get_cr8);
void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
{
struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
if (!apic) {
value |= MSR_IA32_APICBASE_BSP;
vcpu->apic_base = value;
return;
}
if (apic->vcpu->vcpu_id)
value &= ~MSR_IA32_APICBASE_BSP;
vcpu->apic_base = value;
apic->base_address = apic->vcpu->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->apic_base, apic->base_address);
}
u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu)
{
return vcpu->apic_base;
}
EXPORT_SYMBOL_GPL(kvm_lapic_get_base);
void kvm_lapic_reset(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic;
int i;
apic_debug("%s\n", __FUNCTION__);
ASSERT(vcpu);
apic = vcpu->apic;
ASSERT(apic != NULL);
/* Stop the timer in case it's a reset to an active apic */
hrtimer_cancel(&apic->timer.dev);
apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
apic_set_reg(apic, APIC_LVR, APIC_VERSION);
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);
}
update_divide_count(apic);
atomic_set(&apic->timer.pending, 0);
if (vcpu->vcpu_id == 0)
vcpu->apic_base |= MSR_IA32_APICBASE_BSP;
apic_update_ppr(apic);
apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
"0x%016" PRIx64 ", base_address=0x%0lx.\n", __FUNCTION__,
vcpu, kvm_apic_id(apic),
vcpu->apic_base, apic->base_address);
}
EXPORT_SYMBOL_GPL(kvm_lapic_reset);
int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = (struct kvm_lapic *)vcpu->apic;
int ret = 0;
if (!apic)
return 0;
ret = apic_enabled(apic);
return ret;
}
EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
/*
*----------------------------------------------------------------------
* timer interface
*----------------------------------------------------------------------
*/
/* TODO: make sure __apic_timer_fn runs in current pCPU */
static int __apic_timer_fn(struct kvm_lapic *apic)
{
int result = 0;
wait_queue_head_t *q = &apic->vcpu->wq;
atomic_inc(&apic->timer.pending);
if (waitqueue_active(q))
{
apic->vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
wake_up_interruptible(q);
}
if (apic_lvtt_period(apic)) {
result = 1;
apic->timer.dev.expires = ktime_add_ns(
apic->timer.dev.expires,
apic->timer.period);
}
return result;
}
static int __inject_apic_timer_irq(struct kvm_lapic *apic)
{
int vector;
vector = apic_lvt_vector(apic, APIC_LVTT);
return __apic_accept_irq(apic, APIC_DM_FIXED, vector, 1, 0);
}
static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
{
struct kvm_lapic *apic;
int restart_timer = 0;
apic = container_of(data, struct kvm_lapic, timer.dev);
restart_timer = __apic_timer_fn(apic);
if (restart_timer)
return HRTIMER_RESTART;
else
return HRTIMER_NORESTART;
}
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->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;
}
apic->regs = page_address(apic->regs_page);
memset(apic->regs, 0, PAGE_SIZE);
apic->vcpu = vcpu;
hrtimer_init(&apic->timer.dev, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
apic->timer.dev.function = apic_timer_fn;
apic->base_address = APIC_DEFAULT_PHYS_BASE;
vcpu->apic_base = APIC_DEFAULT_PHYS_BASE;
kvm_lapic_reset(vcpu);
apic->dev.read = apic_mmio_read;
apic->dev.write = apic_mmio_write;
apic->dev.in_range = apic_mmio_range;
apic->dev.private = apic;
return 0;
nomem:
kvm_free_apic(apic);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(kvm_create_lapic);
int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->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->apic, APIC_LVT0);
int r = 0;
if (vcpu->vcpu_id == 0) {
if (!apic_hw_enabled(vcpu->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->apic;
if (apic && apic_lvt_enabled(apic, APIC_LVTT) &&
atomic_read(&apic->timer.pending) > 0) {
if (__inject_apic_timer_irq(apic))
atomic_dec(&apic->timer.pending);
}
}
void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
{
struct kvm_lapic *apic = vcpu->apic;
if (apic && apic_lvt_vector(apic, APIC_LVTT) == vec)
apic->timer.last_update = ktime_add_ns(
apic->timer.last_update,
apic->timer.period);
}
int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
{
int vector = kvm_apic_has_interrupt(vcpu);
struct kvm_lapic *apic = vcpu->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->apic;
apic->base_address = vcpu->apic_base &
MSR_IA32_APICBASE_BASE;
apic_set_reg(apic, APIC_LVR, APIC_VERSION);
apic_update_ppr(apic);
hrtimer_cancel(&apic->timer.dev);
update_divide_count(apic);
start_apic_timer(apic);
}
void kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->apic;
struct hrtimer *timer;
if (!apic)
return;
timer = &apic->timer.dev;
if (hrtimer_cancel(timer))
hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
}
EXPORT_SYMBOL_GPL(kvm_migrate_apic_timer);
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