[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 <linux/kvm.h>
#include "qapi/error.h"
#include "qemu/module.h"
#include "qemu/timer.h"
#include "sysemu/sysemu.h"
#include "hw/timer/i8254.h"
#include "hw/timer/i8254_internal.h"
#include "sysemu/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_io(&pit->ioports, OBJECT(dev), NULL, 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);

    device_class_set_parent_realize(dc, kvm_pit_realizefn,
                                    &kpc->parent_realize);
    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	*/
a9c94277	25
b6a0aa05	26	#include "qemu/osdep.h"
a9c94277	27	#include <linux/kvm.h>
da34e65c	28	#include "qapi/error.h"
0b8fa32f	29	#include "qemu/module.h"
1de7afc9	30	#include "qemu/timer.h"
9c17d615	31	#include "sysemu/sysemu.h"
0d09e41a PB	32	#include "hw/timer/i8254.h"
0d09e41a PB	33	#include "hw/timer/i8254_internal.h"
9c17d615	34	#include "sysemu/kvm.h"
5d17c0d2 JK	35
	36	#define KVM_PIT_REINJECT_BIT 0
	37
0cdd3d14 JK	38	#define CALIBRATION_ROUNDS 3
0cdd3d14 JK	39
58cd9864	40	#define KVM_PIT(obj) OBJECT_CHECK(KVMPITState, (obj), TYPE_KVM_I8254)
a15d0912 AF	41	#define KVM_PIT_CLASS(class) \
	42	OBJECT_CLASS_CHECK(KVMPITClass, (class), TYPE_KVM_I8254)
	43	#define KVM_PIT_GET_CLASS(obj) \
	44	OBJECT_GET_CLASS(KVMPITClass, (obj), TYPE_KVM_I8254)
58cd9864	45
5d17c0d2	46	typedef struct KVMPITState {
58cd9864 AF	47	PITCommonState parent_obj;
58cd9864 AF	48
5d17c0d2	49	LostTickPolicy lost_tick_policy;
205df4d1 JK	50	bool vm_stopped;
205df4d1 JK	51	int64_t kernel_clock_offset;
5d17c0d2 JK	52	} KVMPITState;
5d17c0d2 JK	53
a15d0912 AF	54	typedef struct KVMPITClass {
	55	PITCommonClass parent_class;
	56
	57	DeviceRealize parent_realize;
	58	} KVMPITClass;
	59
0cdd3d14	60	static int64_t abs64(int64_t v)
5d17c0d2	61	{
0cdd3d14 JK	62	return v < 0 ? -v : v;
	63	}
	64
205df4d1	65	static void kvm_pit_update_clock_offset(KVMPITState *s)
0cdd3d14	66	{
0cdd3d14 JK	67	int64_t offset, clock_offset;
0cdd3d14 JK	68	struct timespec ts;
205df4d1	69	int i;
0cdd3d14 JK	70
	71	/*
	72	* Measure the delta between CLOCK_MONOTONIC, the base used for
bc72ad67	73	* kvm_pit_channel_state::count_load_time, and QEMU_CLOCK_VIRTUAL. Take the
0cdd3d14 JK	74	* minimum of several samples to filter out scheduling noise.
	75	*/
	76	clock_offset = INT64_MAX;
	77	for (i = 0; i < CALIBRATION_ROUNDS; i++) {
bc72ad67	78	offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
0cdd3d14 JK	79	clock_gettime(CLOCK_MONOTONIC, &ts);
	80	offset -= ts.tv_nsec;
	81	offset -= (int64_t)ts.tv_sec * 1000000000;
	82	if (abs64(offset) < abs64(clock_offset)) {
	83	clock_offset = offset;
	84	}
	85	}
205df4d1 JK	86	s->kernel_clock_offset = clock_offset;
	87	}
	88
	89	static void kvm_pit_get(PITCommonState *pit)
	90	{
58cd9864	91	KVMPITState *s = KVM_PIT(pit);
205df4d1 JK	92	struct kvm_pit_state2 kpit;
	93	struct kvm_pit_channel_state *kchan;
	94	struct PITChannelState *sc;
	95	int i, ret;
	96
	97	/* No need to re-read the state if VM is stopped. */
	98	if (s->vm_stopped) {
	99	return;
	100	}
0cdd3d14	101
5d17c0d2 JK	102	if (kvm_has_pit_state2()) {
	103	ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT2, &kpit);
	104	if (ret < 0) {
	105	fprintf(stderr, "KVM_GET_PIT2 failed: %s\n", strerror(ret));
	106	abort();
	107	}
0cdd3d14	108	pit->channels[0].irq_disabled = kpit.flags & KVM_PIT_FLAGS_HPET_LEGACY;
5d17c0d2 JK	109	} else {
	110	/*
	111	* kvm_pit_state2 is superset of kvm_pit_state struct,
	112	* so we can use it for KVM_GET_PIT as well.
	113	*/
	114	ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT, &kpit);
	115	if (ret < 0) {
	116	fprintf(stderr, "KVM_GET_PIT failed: %s\n", strerror(ret));
	117	abort();
	118	}
	119	}
	120	for (i = 0; i < 3; i++) {
	121	kchan = &kpit.channels[i];
0cdd3d14	122	sc = &pit->channels[i];
5d17c0d2 JK	123	sc->count = kchan->count;
	124	sc->latched_count = kchan->latched_count;
	125	sc->count_latched = kchan->count_latched;
	126	sc->status_latched = kchan->status_latched;
	127	sc->status = kchan->status;
	128	sc->read_state = kchan->read_state;
	129	sc->write_state = kchan->write_state;
	130	sc->write_latch = kchan->write_latch;
	131	sc->rw_mode = kchan->rw_mode;
	132	sc->mode = kchan->mode;
	133	sc->bcd = kchan->bcd;
	134	sc->gate = kchan->gate;
205df4d1	135	sc->count_load_time = kchan->count_load_time + s->kernel_clock_offset;
5d17c0d2 JK	136	}
5d17c0d2 JK	137
0cdd3d14	138	sc = &pit->channels[0];
5d17c0d2 JK	139	sc->next_transition_time =
	140	pit_get_next_transition_time(sc, sc->count_load_time);
	141	}
	142
050a4606	143	static void kvm_pit_put(PITCommonState *pit)
5d17c0d2	144	{
58cd9864	145	KVMPITState *s = KVM_PIT(pit);
b0a05512	146	struct kvm_pit_state2 kpit = {};
5d17c0d2 JK	147	struct kvm_pit_channel_state *kchan;
	148	struct PITChannelState *sc;
	149	int i, ret;
	150
050a4606 JK	151	/* The offset keeps changing as long as the VM is stopped. */
	152	if (s->vm_stopped) {
	153	kvm_pit_update_clock_offset(s);
	154	}
	155
	156	kpit.flags = pit->channels[0].irq_disabled ? KVM_PIT_FLAGS_HPET_LEGACY : 0;
5d17c0d2 JK	157	for (i = 0; i < 3; i++) {
5d17c0d2 JK	158	kchan = &kpit.channels[i];
050a4606	159	sc = &pit->channels[i];
5d17c0d2 JK	160	kchan->count = sc->count;
	161	kchan->latched_count = sc->latched_count;
	162	kchan->count_latched = sc->count_latched;
	163	kchan->status_latched = sc->status_latched;
	164	kchan->status = sc->status;
	165	kchan->read_state = sc->read_state;
	166	kchan->write_state = sc->write_state;
	167	kchan->write_latch = sc->write_latch;
	168	kchan->rw_mode = sc->rw_mode;
	169	kchan->mode = sc->mode;
	170	kchan->bcd = sc->bcd;
	171	kchan->gate = sc->gate;
050a4606	172	kchan->count_load_time = sc->count_load_time - s->kernel_clock_offset;
5d17c0d2 JK	173	}
	174
	175	ret = kvm_vm_ioctl(kvm_state,
	176	kvm_has_pit_state2() ? KVM_SET_PIT2 : KVM_SET_PIT,
	177	&kpit);
	178	if (ret < 0) {
	179	fprintf(stderr, "%s failed: %s\n",
	180	kvm_has_pit_state2() ? "KVM_SET_PIT2" : "KVM_SET_PIT",
	181	strerror(ret));
	182	abort();
	183	}
	184	}
	185
	186	static void kvm_pit_set_gate(PITCommonState s, PITChannelState sc, int val)
	187	{
	188	kvm_pit_get(s);
	189
	190	switch (sc->mode) {
	191	default:
	192	case 0:
	193	case 4:
	194	/* XXX: just disable/enable counting */
	195	break;
	196	case 1:
	197	case 2:
	198	case 3:
	199	case 5:
	200	if (sc->gate < val) {
	201	/* restart counting on rising edge */
bc72ad67	202	sc->count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
5d17c0d2 JK	203	}
	204	break;
	205	}
	206	sc->gate = val;
	207
	208	kvm_pit_put(s);
	209	}
	210
	211	static void kvm_pit_get_channel_info(PITCommonState s, PITChannelState sc,
	212	PITChannelInfo *info)
	213	{
	214	kvm_pit_get(s);
	215
	216	pit_get_channel_info_common(s, sc, info);
	217	}
	218
	219	static void kvm_pit_reset(DeviceState *dev)
	220	{
58cd9864	221	PITCommonState *s = PIT_COMMON(dev);
5d17c0d2 JK	222
	223	pit_reset_common(s);
	224
	225	kvm_pit_put(s);
	226	}
	227
	228	static void kvm_pit_irq_control(void *opaque, int n, int enable)
	229	{
	230	PITCommonState *pit = opaque;
	231	PITChannelState *s = &pit->channels[0];
	232
	233	kvm_pit_get(pit);
	234
	235	s->irq_disabled = !enable;
	236
	237	kvm_pit_put(pit);
	238	}
	239
0cdd3d14 JK	240	static void kvm_pit_vm_state_change(void *opaque, int running,
	241	RunState state)
	242	{
	243	KVMPITState *s = opaque;
	244
	245	if (running) {
205df4d1	246	kvm_pit_update_clock_offset(s);
be894f51	247	kvm_pit_put(PIT_COMMON(s));
205df4d1	248	s->vm_stopped = false;
0cdd3d14	249	} else {
205df4d1	250	kvm_pit_update_clock_offset(s);
58cd9864	251	kvm_pit_get(PIT_COMMON(s));
205df4d1	252	s->vm_stopped = true;
0cdd3d14 JK	253	}
	254	}
	255
a15d0912	256	static void kvm_pit_realizefn(DeviceState dev, Error *errp)
5d17c0d2	257	{
a15d0912 AF	258	PITCommonState *pit = PIT_COMMON(dev);
a15d0912 AF	259	KVMPITClass *kpc = KVM_PIT_GET_CLASS(dev);
58cd9864	260	KVMPITState *s = KVM_PIT(pit);
5d17c0d2 JK	261	struct kvm_pit_config config = {
	262	.flags = 0,
	263	};
	264	int ret;
	265
	266	if (kvm_check_extension(kvm_state, KVM_CAP_PIT2)) {
	267	ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT2, &config);
	268	} else {
	269	ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT);
	270	}
	271	if (ret < 0) {
a15d0912 AF	272	error_setg(errp, "Create kernel PIC irqchip failed: %s",
	273	strerror(ret));
	274	return;
5d17c0d2 JK	275	}
5d17c0d2 JK	276	switch (s->lost_tick_policy) {
104059da	277	case LOST_TICK_POLICY_DELAY:
5d17c0d2	278	break; /* enabled by default */
104059da	279	case LOST_TICK_POLICY_DISCARD:
5d17c0d2 JK	280	if (kvm_check_extension(kvm_state, KVM_CAP_REINJECT_CONTROL)) {
	281	struct kvm_reinject_control control = { .pit_reinject = 0 };
	282
	283	ret = kvm_vm_ioctl(kvm_state, KVM_REINJECT_CONTROL, &control);
	284	if (ret < 0) {
a15d0912 AF	285	error_setg(errp,
	286	"Can't disable in-kernel PIT reinjection: %s",
	287	strerror(ret));
	288	return;
5d17c0d2 JK	289	}
	290	}
	291	break;
	292	default:
a15d0912 AF	293	error_setg(errp, "Lost tick policy not supported.");
a15d0912 AF	294	return;
5d17c0d2 JK	295	}
5d17c0d2 JK	296
257a7430	297	memory_region_init_io(&pit->ioports, OBJECT(dev), NULL, NULL, "kvm-pit", 4);
5d17c0d2	298
a15d0912	299	qdev_init_gpio_in(dev, kvm_pit_irq_control, 1);
5d17c0d2	300
0cdd3d14 JK	301	qemu_add_vm_change_state_handler(kvm_pit_vm_state_change, s);
0cdd3d14 JK	302
a15d0912	303	kpc->parent_realize(dev, errp);
5d17c0d2 JK	304	}
	305
	306	static Property kvm_pit_properties[] = {
c7bcc85d	307	DEFINE_PROP_UINT32("iobase", PITCommonState, iobase, -1),
5d17c0d2	308	DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", KVMPITState,
104059da	309	lost_tick_policy, LOST_TICK_POLICY_DELAY),
5d17c0d2 JK	310	DEFINE_PROP_END_OF_LIST(),
	311	};
	312
	313	static void kvm_pit_class_init(ObjectClass klass, void data)
	314	{
a15d0912	315	KVMPITClass *kpc = KVM_PIT_CLASS(klass);
5d17c0d2 JK	316	PITCommonClass *k = PIT_COMMON_CLASS(klass);
	317	DeviceClass *dc = DEVICE_CLASS(klass);
	318
bf853881 PMD	319	device_class_set_parent_realize(dc, kvm_pit_realizefn,
bf853881 PMD	320	&kpc->parent_realize);
5d17c0d2 JK	321	k->set_channel_gate = kvm_pit_set_gate;
5d17c0d2 JK	322	k->get_channel_info = kvm_pit_get_channel_info;
5d17c0d2 JK	323	dc->reset = kvm_pit_reset;
	324	dc->props = kvm_pit_properties;
	325	}
	326
8c43a6f0	327	static const TypeInfo kvm_pit_info = {
58cd9864	328	.name = TYPE_KVM_I8254,
5d17c0d2 JK	329	.parent = TYPE_PIT_COMMON,
	330	.instance_size = sizeof(KVMPITState),
	331	.class_init = kvm_pit_class_init,
a15d0912	332	.class_size = sizeof(KVMPITClass),
5d17c0d2 JK	333	};
	334
	335	static void kvm_pit_register(void)
	336	{
	337	type_register_static(&kvm_pit_info);
	338	}
	339
	340	type_init(kvm_pit_register)