[qemu.git] / hw / i386 / kvm / i8254.c

/*
 * KVM in-kernel PIT (i8254) support
 *
 * Copyright (c) 2003-2004 Fabrice Bellard
 * Copyright (c) 2012      Jan Kiszka, Siemens AG
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/timer.h"
#include "sysemu/sysemu.h"
#include "hw/timer/i8254.h"
#include "hw/timer/i8254_internal.h"
#include "sysemu/kvm.h"
#include "linux/kvm.h"

#define KVM_PIT_REINJECT_BIT 0

#define CALIBRATION_ROUNDS   3

#define KVM_PIT(obj) OBJECT_CHECK(KVMPITState, (obj), TYPE_KVM_I8254)
#define KVM_PIT_CLASS(class) \
    OBJECT_CLASS_CHECK(KVMPITClass, (class), TYPE_KVM_I8254)
#define KVM_PIT_GET_CLASS(obj) \
    OBJECT_GET_CLASS(KVMPITClass, (obj), TYPE_KVM_I8254)

typedef struct KVMPITState {
    PITCommonState parent_obj;

    LostTickPolicy lost_tick_policy;
    bool vm_stopped;
    int64_t kernel_clock_offset;
} KVMPITState;

typedef struct KVMPITClass {
    PITCommonClass parent_class;

    DeviceRealize parent_realize;
} KVMPITClass;

static int64_t abs64(int64_t v)
{
    return v < 0 ? -v : v;
}

static void kvm_pit_update_clock_offset(KVMPITState *s)
{
    int64_t offset, clock_offset;
    struct timespec ts;
    int i;

    /*
     * Measure the delta between CLOCK_MONOTONIC, the base used for
     * kvm_pit_channel_state::count_load_time, and QEMU_CLOCK_VIRTUAL. Take the
     * minimum of several samples to filter out scheduling noise.
     */
    clock_offset = INT64_MAX;
    for (i = 0; i < CALIBRATION_ROUNDS; i++) {
        offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
        clock_gettime(CLOCK_MONOTONIC, &ts);
        offset -= ts.tv_nsec;
        offset -= (int64_t)ts.tv_sec * 1000000000;
        if (abs64(offset) < abs64(clock_offset)) {
            clock_offset = offset;
        }
    }
    s->kernel_clock_offset = clock_offset;
}

static void kvm_pit_get(PITCommonState *pit)
{
    KVMPITState *s = KVM_PIT(pit);
    struct kvm_pit_state2 kpit;
    struct kvm_pit_channel_state *kchan;
    struct PITChannelState *sc;
    int i, ret;

    /* No need to re-read the state if VM is stopped. */
    if (s->vm_stopped) {
        return;
    }

    if (kvm_has_pit_state2()) {
        ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT2, &kpit);
        if (ret < 0) {
            fprintf(stderr, "KVM_GET_PIT2 failed: %s\n", strerror(ret));
            abort();
        }
        pit->channels[0].irq_disabled = kpit.flags & KVM_PIT_FLAGS_HPET_LEGACY;
    } else {
        /*
         * kvm_pit_state2 is superset of kvm_pit_state struct,
         * so we can use it for KVM_GET_PIT as well.
         */
        ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT, &kpit);
        if (ret < 0) {
            fprintf(stderr, "KVM_GET_PIT failed: %s\n", strerror(ret));
            abort();
        }
    }
    for (i = 0; i < 3; i++) {
        kchan = &kpit.channels[i];
        sc = &pit->channels[i];
        sc->count = kchan->count;
        sc->latched_count = kchan->latched_count;
        sc->count_latched = kchan->count_latched;
        sc->status_latched = kchan->status_latched;
        sc->status = kchan->status;
        sc->read_state = kchan->read_state;
        sc->write_state = kchan->write_state;
        sc->write_latch = kchan->write_latch;
        sc->rw_mode = kchan->rw_mode;
        sc->mode = kchan->mode;
        sc->bcd = kchan->bcd;
        sc->gate = kchan->gate;
        sc->count_load_time = kchan->count_load_time + s->kernel_clock_offset;
    }

    sc = &pit->channels[0];
    sc->next_transition_time =
        pit_get_next_transition_time(sc, sc->count_load_time);
}

static void kvm_pit_put(PITCommonState *pit)
{
    KVMPITState *s = KVM_PIT(pit);
    struct kvm_pit_state2 kpit = {};
    struct kvm_pit_channel_state *kchan;
    struct PITChannelState *sc;
    int i, ret;

    /* The offset keeps changing as long as the VM is stopped. */
    if (s->vm_stopped) {
        kvm_pit_update_clock_offset(s);
    }

    kpit.flags = pit->channels[0].irq_disabled ? KVM_PIT_FLAGS_HPET_LEGACY : 0;
    for (i = 0; i < 3; i++) {
        kchan = &kpit.channels[i];
        sc = &pit->channels[i];
        kchan->count = sc->count;
        kchan->latched_count = sc->latched_count;
        kchan->count_latched = sc->count_latched;
        kchan->status_latched = sc->status_latched;
        kchan->status = sc->status;
        kchan->read_state = sc->read_state;
        kchan->write_state = sc->write_state;
        kchan->write_latch = sc->write_latch;
        kchan->rw_mode = sc->rw_mode;
        kchan->mode = sc->mode;
        kchan->bcd = sc->bcd;
        kchan->gate = sc->gate;
        kchan->count_load_time = sc->count_load_time - s->kernel_clock_offset;
    }

    ret = kvm_vm_ioctl(kvm_state,
                       kvm_has_pit_state2() ? KVM_SET_PIT2 : KVM_SET_PIT,
                       &kpit);
    if (ret < 0) {
        fprintf(stderr, "%s failed: %s\n",
                kvm_has_pit_state2() ? "KVM_SET_PIT2" : "KVM_SET_PIT",
                strerror(ret));
        abort();
    }
}

static void kvm_pit_set_gate(PITCommonState *s, PITChannelState *sc, int val)
{
    kvm_pit_get(s);

    switch (sc->mode) {
    default:
    case 0:
    case 4:
        /* XXX: just disable/enable counting */
        break;
    case 1:
    case 2:
    case 3:
    case 5:
        if (sc->gate < val) {
            /* restart counting on rising edge */
            sc->count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
        }
        break;
    }
    sc->gate = val;

    kvm_pit_put(s);
}

static void kvm_pit_get_channel_info(PITCommonState *s, PITChannelState *sc,
                                     PITChannelInfo *info)
{
    kvm_pit_get(s);

    pit_get_channel_info_common(s, sc, info);
}

static void kvm_pit_reset(DeviceState *dev)
{
    PITCommonState *s = PIT_COMMON(dev);

    pit_reset_common(s);

    kvm_pit_put(s);
}

static void kvm_pit_irq_control(void *opaque, int n, int enable)
{
    PITCommonState *pit = opaque;
    PITChannelState *s = &pit->channels[0];

    kvm_pit_get(pit);

    s->irq_disabled = !enable;

    kvm_pit_put(pit);
}

static void kvm_pit_vm_state_change(void *opaque, int running,
                                    RunState state)
{
    KVMPITState *s = opaque;

    if (running) {
        kvm_pit_update_clock_offset(s);
        kvm_pit_put(PIT_COMMON(s));
        s->vm_stopped = false;
    } else {
        kvm_pit_update_clock_offset(s);
        kvm_pit_get(PIT_COMMON(s));
        s->vm_stopped = true;
    }
}

static void kvm_pit_realizefn(DeviceState *dev, Error **errp)
{
    PITCommonState *pit = PIT_COMMON(dev);
    KVMPITClass *kpc = KVM_PIT_GET_CLASS(dev);
    KVMPITState *s = KVM_PIT(pit);
    struct kvm_pit_config config = {
        .flags = 0,
    };
    int ret;

    if (kvm_check_extension(kvm_state, KVM_CAP_PIT2)) {
        ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT2, &config);
    } else {
        ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT);
    }
    if (ret < 0) {
        error_setg(errp, "Create kernel PIC irqchip failed: %s",
                   strerror(ret));
        return;
    }
    switch (s->lost_tick_policy) {
    case LOST_TICK_POLICY_DELAY:
        break; /* enabled by default */
    case LOST_TICK_POLICY_DISCARD:
        if (kvm_check_extension(kvm_state, KVM_CAP_REINJECT_CONTROL)) {
            struct kvm_reinject_control control = { .pit_reinject = 0 };

            ret = kvm_vm_ioctl(kvm_state, KVM_REINJECT_CONTROL, &control);
            if (ret < 0) {
                error_setg(errp,
                           "Can't disable in-kernel PIT reinjection: %s",
                           strerror(ret));
                return;
            }
        }
        break;
    default:
        error_setg(errp, "Lost tick policy not supported.");
        return;
    }

    memory_region_init_reservation(&pit->ioports, NULL, "kvm-pit", 4);

    qdev_init_gpio_in(dev, kvm_pit_irq_control, 1);

    qemu_add_vm_change_state_handler(kvm_pit_vm_state_change, s);

    kpc->parent_realize(dev, errp);
}

static Property kvm_pit_properties[] = {
    DEFINE_PROP_UINT32("iobase", PITCommonState, iobase,  -1),
    DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", KVMPITState,
                               lost_tick_policy, LOST_TICK_POLICY_DELAY),
    DEFINE_PROP_END_OF_LIST(),
};

static void kvm_pit_class_init(ObjectClass *klass, void *data)
{
    KVMPITClass *kpc = KVM_PIT_CLASS(klass);
    PITCommonClass *k = PIT_COMMON_CLASS(klass);
    DeviceClass *dc = DEVICE_CLASS(klass);

    kpc->parent_realize = dc->realize;
    dc->realize = kvm_pit_realizefn;
    k->set_channel_gate = kvm_pit_set_gate;
    k->get_channel_info = kvm_pit_get_channel_info;
    dc->reset = kvm_pit_reset;
    dc->props = kvm_pit_properties;
}

static const TypeInfo kvm_pit_info = {
    .name          = TYPE_KVM_I8254,
    .parent        = TYPE_PIT_COMMON,
    .instance_size = sizeof(KVMPITState),
    .class_init = kvm_pit_class_init,
    .class_size = sizeof(KVMPITClass),
};

static void kvm_pit_register(void)
{
    type_register_static(&kvm_pit_info);
}

type_init(kvm_pit_register)
Commit	Line	Data
5d17c0d2 JK	1	/*
	2	* KVM in-kernel PIT (i8254) support
	3	*
	4	* Copyright (c) 2003-2004 Fabrice Bellard
	5	* Copyright (c) 2012 Jan Kiszka, Siemens AG
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a copy
	8	* of this software and associated documentation files (the "Software"), to deal
	9	* in the Software without restriction, including without limitation the rights
	10	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	11	* copies of the Software, and to permit persons to whom the Software is
	12	* furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice shall be included in
	15	* all copies or substantial portions of the Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	20	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	21	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	22	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	23	* THE SOFTWARE.
	24	*/
b6a0aa05	25	#include "qemu/osdep.h"
da34e65c	26	#include "qapi/error.h"
1de7afc9	27	#include "qemu/timer.h"
9c17d615	28	#include "sysemu/sysemu.h"
0d09e41a PB	29	#include "hw/timer/i8254.h"
0d09e41a PB	30	#include "hw/timer/i8254_internal.h"
9c17d615	31	#include "sysemu/kvm.h"
e81096b1	32	#include "linux/kvm.h"
5d17c0d2 JK	33
	34	#define KVM_PIT_REINJECT_BIT 0
	35
0cdd3d14 JK	36	#define CALIBRATION_ROUNDS 3
0cdd3d14 JK	37
58cd9864	38	#define KVM_PIT(obj) OBJECT_CHECK(KVMPITState, (obj), TYPE_KVM_I8254)
a15d0912 AF	39	#define KVM_PIT_CLASS(class) \
	40	OBJECT_CLASS_CHECK(KVMPITClass, (class), TYPE_KVM_I8254)
	41	#define KVM_PIT_GET_CLASS(obj) \
	42	OBJECT_GET_CLASS(KVMPITClass, (obj), TYPE_KVM_I8254)
58cd9864	43
5d17c0d2	44	typedef struct KVMPITState {
58cd9864 AF	45	PITCommonState parent_obj;
58cd9864 AF	46
5d17c0d2	47	LostTickPolicy lost_tick_policy;
205df4d1 JK	48	bool vm_stopped;
205df4d1 JK	49	int64_t kernel_clock_offset;
5d17c0d2 JK	50	} KVMPITState;
5d17c0d2 JK	51
a15d0912 AF	52	typedef struct KVMPITClass {
	53	PITCommonClass parent_class;
	54
	55	DeviceRealize parent_realize;
	56	} KVMPITClass;
	57
0cdd3d14	58	static int64_t abs64(int64_t v)
5d17c0d2	59	{
0cdd3d14 JK	60	return v < 0 ? -v : v;
	61	}
	62
205df4d1	63	static void kvm_pit_update_clock_offset(KVMPITState *s)
0cdd3d14	64	{
0cdd3d14 JK	65	int64_t offset, clock_offset;
0cdd3d14 JK	66	struct timespec ts;
205df4d1	67	int i;
0cdd3d14 JK	68
	69	/*
	70	* Measure the delta between CLOCK_MONOTONIC, the base used for
bc72ad67	71	* kvm_pit_channel_state::count_load_time, and QEMU_CLOCK_VIRTUAL. Take the
0cdd3d14 JK	72	* minimum of several samples to filter out scheduling noise.
	73	*/
	74	clock_offset = INT64_MAX;
	75	for (i = 0; i < CALIBRATION_ROUNDS; i++) {
bc72ad67	76	offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
0cdd3d14 JK	77	clock_gettime(CLOCK_MONOTONIC, &ts);
	78	offset -= ts.tv_nsec;
	79	offset -= (int64_t)ts.tv_sec * 1000000000;
	80	if (abs64(offset) < abs64(clock_offset)) {
	81	clock_offset = offset;
	82	}
	83	}
205df4d1 JK	84	s->kernel_clock_offset = clock_offset;
	85	}
	86
	87	static void kvm_pit_get(PITCommonState *pit)
	88	{
58cd9864	89	KVMPITState *s = KVM_PIT(pit);
205df4d1 JK	90	struct kvm_pit_state2 kpit;
	91	struct kvm_pit_channel_state *kchan;
	92	struct PITChannelState *sc;
	93	int i, ret;
	94
	95	/* No need to re-read the state if VM is stopped. */
	96	if (s->vm_stopped) {
	97	return;
	98	}
0cdd3d14	99
5d17c0d2 JK	100	if (kvm_has_pit_state2()) {
	101	ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT2, &kpit);
	102	if (ret < 0) {
	103	fprintf(stderr, "KVM_GET_PIT2 failed: %s\n", strerror(ret));
	104	abort();
	105	}
0cdd3d14	106	pit->channels[0].irq_disabled = kpit.flags & KVM_PIT_FLAGS_HPET_LEGACY;
5d17c0d2 JK	107	} else {
	108	/*
	109	* kvm_pit_state2 is superset of kvm_pit_state struct,
	110	* so we can use it for KVM_GET_PIT as well.
	111	*/
	112	ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT, &kpit);
	113	if (ret < 0) {
	114	fprintf(stderr, "KVM_GET_PIT failed: %s\n", strerror(ret));
	115	abort();
	116	}
	117	}
	118	for (i = 0; i < 3; i++) {
	119	kchan = &kpit.channels[i];
0cdd3d14	120	sc = &pit->channels[i];
5d17c0d2 JK	121	sc->count = kchan->count;
	122	sc->latched_count = kchan->latched_count;
	123	sc->count_latched = kchan->count_latched;
	124	sc->status_latched = kchan->status_latched;
	125	sc->status = kchan->status;
	126	sc->read_state = kchan->read_state;
	127	sc->write_state = kchan->write_state;
	128	sc->write_latch = kchan->write_latch;
	129	sc->rw_mode = kchan->rw_mode;
	130	sc->mode = kchan->mode;
	131	sc->bcd = kchan->bcd;
	132	sc->gate = kchan->gate;
205df4d1	133	sc->count_load_time = kchan->count_load_time + s->kernel_clock_offset;
5d17c0d2 JK	134	}
5d17c0d2 JK	135
0cdd3d14	136	sc = &pit->channels[0];
5d17c0d2 JK	137	sc->next_transition_time =
	138	pit_get_next_transition_time(sc, sc->count_load_time);
	139	}
	140
050a4606	141	static void kvm_pit_put(PITCommonState *pit)
5d17c0d2	142	{
58cd9864	143	KVMPITState *s = KVM_PIT(pit);
b0a05512	144	struct kvm_pit_state2 kpit = {};
5d17c0d2 JK	145	struct kvm_pit_channel_state *kchan;
	146	struct PITChannelState *sc;
	147	int i, ret;
	148
050a4606 JK	149	/* The offset keeps changing as long as the VM is stopped. */
	150	if (s->vm_stopped) {
	151	kvm_pit_update_clock_offset(s);
	152	}
	153
	154	kpit.flags = pit->channels[0].irq_disabled ? KVM_PIT_FLAGS_HPET_LEGACY : 0;
5d17c0d2 JK	155	for (i = 0; i < 3; i++) {
5d17c0d2 JK	156	kchan = &kpit.channels[i];
050a4606	157	sc = &pit->channels[i];
5d17c0d2 JK	158	kchan->count = sc->count;
	159	kchan->latched_count = sc->latched_count;
	160	kchan->count_latched = sc->count_latched;
	161	kchan->status_latched = sc->status_latched;
	162	kchan->status = sc->status;
	163	kchan->read_state = sc->read_state;
	164	kchan->write_state = sc->write_state;
	165	kchan->write_latch = sc->write_latch;
	166	kchan->rw_mode = sc->rw_mode;
	167	kchan->mode = sc->mode;
	168	kchan->bcd = sc->bcd;
	169	kchan->gate = sc->gate;
050a4606	170	kchan->count_load_time = sc->count_load_time - s->kernel_clock_offset;
5d17c0d2 JK	171	}
	172
	173	ret = kvm_vm_ioctl(kvm_state,
	174	kvm_has_pit_state2() ? KVM_SET_PIT2 : KVM_SET_PIT,
	175	&kpit);
	176	if (ret < 0) {
	177	fprintf(stderr, "%s failed: %s\n",
	178	kvm_has_pit_state2() ? "KVM_SET_PIT2" : "KVM_SET_PIT",
	179	strerror(ret));
	180	abort();
	181	}
	182	}
	183
	184	static void kvm_pit_set_gate(PITCommonState s, PITChannelState sc, int val)
	185	{
	186	kvm_pit_get(s);
	187
	188	switch (sc->mode) {
	189	default:
	190	case 0:
	191	case 4:
	192	/* XXX: just disable/enable counting */
	193	break;
	194	case 1:
	195	case 2:
	196	case 3:
	197	case 5:
	198	if (sc->gate < val) {
	199	/* restart counting on rising edge */
bc72ad67	200	sc->count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
5d17c0d2 JK	201	}
	202	break;
	203	}
	204	sc->gate = val;
	205
	206	kvm_pit_put(s);
	207	}
	208
	209	static void kvm_pit_get_channel_info(PITCommonState s, PITChannelState sc,
	210	PITChannelInfo *info)
	211	{
	212	kvm_pit_get(s);
	213
	214	pit_get_channel_info_common(s, sc, info);
	215	}
	216
	217	static void kvm_pit_reset(DeviceState *dev)
	218	{
58cd9864	219	PITCommonState *s = PIT_COMMON(dev);
5d17c0d2 JK	220
	221	pit_reset_common(s);
	222
	223	kvm_pit_put(s);
	224	}
	225
	226	static void kvm_pit_irq_control(void *opaque, int n, int enable)
	227	{
	228	PITCommonState *pit = opaque;
	229	PITChannelState *s = &pit->channels[0];
	230
	231	kvm_pit_get(pit);
	232
	233	s->irq_disabled = !enable;
	234
	235	kvm_pit_put(pit);
	236	}
	237
0cdd3d14 JK	238	static void kvm_pit_vm_state_change(void *opaque, int running,
	239	RunState state)
	240	{
	241	KVMPITState *s = opaque;
	242
	243	if (running) {
205df4d1	244	kvm_pit_update_clock_offset(s);
be894f51	245	kvm_pit_put(PIT_COMMON(s));
205df4d1	246	s->vm_stopped = false;
0cdd3d14	247	} else {
205df4d1	248	kvm_pit_update_clock_offset(s);
58cd9864	249	kvm_pit_get(PIT_COMMON(s));
205df4d1	250	s->vm_stopped = true;
0cdd3d14 JK	251	}
	252	}
	253
a15d0912	254	static void kvm_pit_realizefn(DeviceState dev, Error *errp)
5d17c0d2	255	{
a15d0912 AF	256	PITCommonState *pit = PIT_COMMON(dev);
a15d0912 AF	257	KVMPITClass *kpc = KVM_PIT_GET_CLASS(dev);
58cd9864	258	KVMPITState *s = KVM_PIT(pit);
5d17c0d2 JK	259	struct kvm_pit_config config = {
	260	.flags = 0,
	261	};
	262	int ret;
	263
	264	if (kvm_check_extension(kvm_state, KVM_CAP_PIT2)) {
	265	ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT2, &config);
	266	} else {
	267	ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT);
	268	}
	269	if (ret < 0) {
a15d0912 AF	270	error_setg(errp, "Create kernel PIC irqchip failed: %s",
	271	strerror(ret));
	272	return;
5d17c0d2 JK	273	}
5d17c0d2 JK	274	switch (s->lost_tick_policy) {
104059da	275	case LOST_TICK_POLICY_DELAY:
5d17c0d2	276	break; /* enabled by default */
104059da	277	case LOST_TICK_POLICY_DISCARD:
5d17c0d2 JK	278	if (kvm_check_extension(kvm_state, KVM_CAP_REINJECT_CONTROL)) {
	279	struct kvm_reinject_control control = { .pit_reinject = 0 };
	280
	281	ret = kvm_vm_ioctl(kvm_state, KVM_REINJECT_CONTROL, &control);
	282	if (ret < 0) {
a15d0912 AF	283	error_setg(errp,
	284	"Can't disable in-kernel PIT reinjection: %s",
	285	strerror(ret));
	286	return;
5d17c0d2 JK	287	}
	288	}
	289	break;
	290	default:
a15d0912 AF	291	error_setg(errp, "Lost tick policy not supported.");
a15d0912 AF	292	return;
5d17c0d2 JK	293	}
5d17c0d2 JK	294
2c9b15ca	295	memory_region_init_reservation(&pit->ioports, NULL, "kvm-pit", 4);
5d17c0d2	296
a15d0912	297	qdev_init_gpio_in(dev, kvm_pit_irq_control, 1);
5d17c0d2	298
0cdd3d14 JK	299	qemu_add_vm_change_state_handler(kvm_pit_vm_state_change, s);
0cdd3d14 JK	300
a15d0912	301	kpc->parent_realize(dev, errp);
5d17c0d2 JK	302	}
	303
	304	static Property kvm_pit_properties[] = {
c7bcc85d	305	DEFINE_PROP_UINT32("iobase", PITCommonState, iobase, -1),
5d17c0d2	306	DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", KVMPITState,
104059da	307	lost_tick_policy, LOST_TICK_POLICY_DELAY),
5d17c0d2 JK	308	DEFINE_PROP_END_OF_LIST(),
	309	};
	310
	311	static void kvm_pit_class_init(ObjectClass klass, void data)
	312	{
a15d0912	313	KVMPITClass *kpc = KVM_PIT_CLASS(klass);
5d17c0d2 JK	314	PITCommonClass *k = PIT_COMMON_CLASS(klass);
	315	DeviceClass *dc = DEVICE_CLASS(klass);
	316
a15d0912 AF	317	kpc->parent_realize = dc->realize;
a15d0912 AF	318	dc->realize = kvm_pit_realizefn;
5d17c0d2 JK	319	k->set_channel_gate = kvm_pit_set_gate;
5d17c0d2 JK	320	k->get_channel_info = kvm_pit_get_channel_info;
5d17c0d2 JK	321	dc->reset = kvm_pit_reset;
	322	dc->props = kvm_pit_properties;
	323	}
	324
8c43a6f0	325	static const TypeInfo kvm_pit_info = {
58cd9864	326	.name = TYPE_KVM_I8254,
5d17c0d2 JK	327	.parent = TYPE_PIT_COMMON,
	328	.instance_size = sizeof(KVMPITState),
	329	.class_init = kvm_pit_class_init,
a15d0912	330	.class_size = sizeof(KVMPITClass),
5d17c0d2 JK	331	};
	332
	333	static void kvm_pit_register(void)
	334	{
	335	type_register_static(&kvm_pit_info);
	336	}
	337
	338	type_init(kvm_pit_register)