[qemu.git] / hw / virtio / vhost-user.c

/*
 * vhost-user
 *
 * Copyright (c) 2013 Virtual Open Systems Sarl.
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-backend.h"
#include "sysemu/char.h"
#include "sysemu/kvm.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "exec/ram_addr.h"

#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <linux/vhost.h>

#define VHOST_MEMORY_MAX_NREGIONS    8
#define VHOST_USER_F_PROTOCOL_FEATURES 30
#define VHOST_USER_PROTOCOL_FEATURE_MASK 0x0ULL

typedef enum VhostUserRequest {
    VHOST_USER_NONE = 0,
    VHOST_USER_GET_FEATURES = 1,
    VHOST_USER_SET_FEATURES = 2,
    VHOST_USER_SET_OWNER = 3,
    VHOST_USER_RESET_OWNER = 4,
    VHOST_USER_SET_MEM_TABLE = 5,
    VHOST_USER_SET_LOG_BASE = 6,
    VHOST_USER_SET_LOG_FD = 7,
    VHOST_USER_SET_VRING_NUM = 8,
    VHOST_USER_SET_VRING_ADDR = 9,
    VHOST_USER_SET_VRING_BASE = 10,
    VHOST_USER_GET_VRING_BASE = 11,
    VHOST_USER_SET_VRING_KICK = 12,
    VHOST_USER_SET_VRING_CALL = 13,
    VHOST_USER_SET_VRING_ERR = 14,
    VHOST_USER_GET_PROTOCOL_FEATURES = 15,
    VHOST_USER_SET_PROTOCOL_FEATURES = 16,
    VHOST_USER_MAX
} VhostUserRequest;

typedef struct VhostUserMemoryRegion {
    uint64_t guest_phys_addr;
    uint64_t memory_size;
    uint64_t userspace_addr;
    uint64_t mmap_offset;
} VhostUserMemoryRegion;

typedef struct VhostUserMemory {
    uint32_t nregions;
    uint32_t padding;
    VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
} VhostUserMemory;

typedef struct VhostUserMsg {
    VhostUserRequest request;

#define VHOST_USER_VERSION_MASK     (0x3)
#define VHOST_USER_REPLY_MASK       (0x1<<2)
    uint32_t flags;
    uint32_t size; /* the following payload size */
    union {
#define VHOST_USER_VRING_IDX_MASK   (0xff)
#define VHOST_USER_VRING_NOFD_MASK  (0x1<<8)
        uint64_t u64;
        struct vhost_vring_state state;
        struct vhost_vring_addr addr;
        VhostUserMemory memory;
    };
} QEMU_PACKED VhostUserMsg;

static VhostUserMsg m __attribute__ ((unused));
#define VHOST_USER_HDR_SIZE (sizeof(m.request) \
                            + sizeof(m.flags) \
                            + sizeof(m.size))

#define VHOST_USER_PAYLOAD_SIZE (sizeof(m) - VHOST_USER_HDR_SIZE)

/* The version of the protocol we support */
#define VHOST_USER_VERSION    (0x1)

static bool ioeventfd_enabled(void)
{
    return kvm_enabled() && kvm_eventfds_enabled();
}

static unsigned long int ioctl_to_vhost_user_request[VHOST_USER_MAX] = {
    -1,                     /* VHOST_USER_NONE */
    VHOST_GET_FEATURES,     /* VHOST_USER_GET_FEATURES */
    VHOST_SET_FEATURES,     /* VHOST_USER_SET_FEATURES */
    VHOST_SET_OWNER,        /* VHOST_USER_SET_OWNER */
    VHOST_RESET_OWNER,      /* VHOST_USER_RESET_OWNER */
    VHOST_SET_MEM_TABLE,    /* VHOST_USER_SET_MEM_TABLE */
    VHOST_SET_LOG_BASE,     /* VHOST_USER_SET_LOG_BASE */
    VHOST_SET_LOG_FD,       /* VHOST_USER_SET_LOG_FD */
    VHOST_SET_VRING_NUM,    /* VHOST_USER_SET_VRING_NUM */
    VHOST_SET_VRING_ADDR,   /* VHOST_USER_SET_VRING_ADDR */
    VHOST_SET_VRING_BASE,   /* VHOST_USER_SET_VRING_BASE */
    VHOST_GET_VRING_BASE,   /* VHOST_USER_GET_VRING_BASE */
    VHOST_SET_VRING_KICK,   /* VHOST_USER_SET_VRING_KICK */
    VHOST_SET_VRING_CALL,   /* VHOST_USER_SET_VRING_CALL */
    VHOST_SET_VRING_ERR     /* VHOST_USER_SET_VRING_ERR */
};

static VhostUserRequest vhost_user_request_translate(unsigned long int request)
{
    VhostUserRequest idx;

    for (idx = 0; idx < VHOST_USER_MAX; idx++) {
        if (ioctl_to_vhost_user_request[idx] == request) {
            break;
        }
    }

    return (idx == VHOST_USER_MAX) ? VHOST_USER_NONE : idx;
}

static int vhost_user_read(struct vhost_dev *dev, VhostUserMsg *msg)
{
    CharDriverState *chr = dev->opaque;
    uint8_t *p = (uint8_t *) msg;
    int r, size = VHOST_USER_HDR_SIZE;

    r = qemu_chr_fe_read_all(chr, p, size);
    if (r != size) {
        error_report("Failed to read msg header. Read %d instead of %d.", r,
                size);
        goto fail;
    }

    /* validate received flags */
    if (msg->flags != (VHOST_USER_REPLY_MASK | VHOST_USER_VERSION)) {
        error_report("Failed to read msg header."
                " Flags 0x%x instead of 0x%x.", msg->flags,
                VHOST_USER_REPLY_MASK | VHOST_USER_VERSION);
        goto fail;
    }

    /* validate message size is sane */
    if (msg->size > VHOST_USER_PAYLOAD_SIZE) {
        error_report("Failed to read msg header."
                " Size %d exceeds the maximum %zu.", msg->size,
                VHOST_USER_PAYLOAD_SIZE);
        goto fail;
    }

    if (msg->size) {
        p += VHOST_USER_HDR_SIZE;
        size = msg->size;
        r = qemu_chr_fe_read_all(chr, p, size);
        if (r != size) {
            error_report("Failed to read msg payload."
                         " Read %d instead of %d.", r, msg->size);
            goto fail;
        }
    }

    return 0;

fail:
    return -1;
}

static int vhost_user_write(struct vhost_dev *dev, VhostUserMsg *msg,
                            int *fds, int fd_num)
{
    CharDriverState *chr = dev->opaque;
    int size = VHOST_USER_HDR_SIZE + msg->size;

    if (fd_num) {
        qemu_chr_fe_set_msgfds(chr, fds, fd_num);
    }

    return qemu_chr_fe_write_all(chr, (const uint8_t *) msg, size) == size ?
            0 : -1;
}

static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
        void *arg)
{
    VhostUserMsg msg;
    VhostUserRequest msg_request;
    struct vhost_vring_file *file = 0;
    int need_reply = 0;
    int fds[VHOST_MEMORY_MAX_NREGIONS];
    int i, fd;
    size_t fd_num = 0;

    assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);

    /* only translate vhost ioctl requests */
    if (request > VHOST_USER_MAX) {
        msg_request = vhost_user_request_translate(request);
    } else {
        msg_request = request;
    }

    msg.request = msg_request;
    msg.flags = VHOST_USER_VERSION;
    msg.size = 0;

    switch (msg_request) {
    case VHOST_USER_GET_FEATURES:
    case VHOST_USER_GET_PROTOCOL_FEATURES:
        need_reply = 1;
        break;

    case VHOST_USER_SET_FEATURES:
    case VHOST_USER_SET_LOG_BASE:
    case VHOST_USER_SET_PROTOCOL_FEATURES:
        msg.u64 = *((__u64 *) arg);
        msg.size = sizeof(m.u64);
        break;

    case VHOST_USER_SET_OWNER:
    case VHOST_USER_RESET_OWNER:
        break;

    case VHOST_USER_SET_MEM_TABLE:
        for (i = 0; i < dev->mem->nregions; ++i) {
            struct vhost_memory_region *reg = dev->mem->regions + i;
            ram_addr_t ram_addr;

            assert((uintptr_t)reg->userspace_addr == reg->userspace_addr);
            qemu_ram_addr_from_host((void *)(uintptr_t)reg->userspace_addr, &ram_addr);
            fd = qemu_get_ram_fd(ram_addr);
            if (fd > 0) {
                msg.memory.regions[fd_num].userspace_addr = reg->userspace_addr;
                msg.memory.regions[fd_num].memory_size  = reg->memory_size;
                msg.memory.regions[fd_num].guest_phys_addr = reg->guest_phys_addr;
                msg.memory.regions[fd_num].mmap_offset = reg->userspace_addr -
                    (uintptr_t) qemu_get_ram_block_host_ptr(ram_addr);
                assert(fd_num < VHOST_MEMORY_MAX_NREGIONS);
                fds[fd_num++] = fd;
            }
        }

        msg.memory.nregions = fd_num;

        if (!fd_num) {
            error_report("Failed initializing vhost-user memory map, "
                    "consider using -object memory-backend-file share=on");
            return -1;
        }

        msg.size = sizeof(m.memory.nregions);
        msg.size += sizeof(m.memory.padding);
        msg.size += fd_num * sizeof(VhostUserMemoryRegion);

        break;

    case VHOST_USER_SET_LOG_FD:
        fds[fd_num++] = *((int *) arg);
        break;

    case VHOST_USER_SET_VRING_NUM:
    case VHOST_USER_SET_VRING_BASE:
        memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
        msg.size = sizeof(m.state);
        break;

    case VHOST_USER_GET_VRING_BASE:
        memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
        msg.size = sizeof(m.state);
        need_reply = 1;
        break;

    case VHOST_USER_SET_VRING_ADDR:
        memcpy(&msg.addr, arg, sizeof(struct vhost_vring_addr));
        msg.size = sizeof(m.addr);
        break;

    case VHOST_USER_SET_VRING_KICK:
    case VHOST_USER_SET_VRING_CALL:
    case VHOST_USER_SET_VRING_ERR:
        file = arg;
        msg.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
        msg.size = sizeof(m.u64);
        if (ioeventfd_enabled() && file->fd > 0) {
            fds[fd_num++] = file->fd;
        } else {
            msg.u64 |= VHOST_USER_VRING_NOFD_MASK;
        }
        break;
    default:
        error_report("vhost-user trying to send unhandled ioctl");
        return -1;
        break;
    }

    if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
        return 0;
    }

    if (need_reply) {
        if (vhost_user_read(dev, &msg) < 0) {
            return 0;
        }

        if (msg_request != msg.request) {
            error_report("Received unexpected msg type."
                    " Expected %d received %d", msg_request, msg.request);
            return -1;
        }

        switch (msg_request) {
        case VHOST_USER_GET_FEATURES:
        case VHOST_USER_GET_PROTOCOL_FEATURES:
            if (msg.size != sizeof(m.u64)) {
                error_report("Received bad msg size.");
                return -1;
            }
            *((__u64 *) arg) = msg.u64;
            break;
        case VHOST_USER_GET_VRING_BASE:
            if (msg.size != sizeof(m.state)) {
                error_report("Received bad msg size.");
                return -1;
            }
            memcpy(arg, &msg.state, sizeof(struct vhost_vring_state));
            break;
        default:
            error_report("Received unexpected msg type.");
            return -1;
            break;
        }
    }

    return 0;
}

static int vhost_user_init(struct vhost_dev *dev, void *opaque)
{
    unsigned long long features;
    int err;

    assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);

    dev->opaque = opaque;

    err = vhost_user_call(dev, VHOST_USER_GET_FEATURES, &features);
    if (err < 0) {
        return err;
    }

    if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) {
        dev->backend_features |= 1ULL << VHOST_USER_F_PROTOCOL_FEATURES;

        err = vhost_user_call(dev, VHOST_USER_GET_PROTOCOL_FEATURES, &features);
        if (err < 0) {
            return err;
        }

        dev->protocol_features = features & VHOST_USER_PROTOCOL_FEATURE_MASK;
        err = vhost_user_call(dev, VHOST_USER_SET_PROTOCOL_FEATURES,
                              &dev->protocol_features);
        if (err < 0) {
            return err;
        }
    }

    return 0;
}

static int vhost_user_cleanup(struct vhost_dev *dev)
{
    assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);

    dev->opaque = 0;

    return 0;
}

const VhostOps user_ops = {
        .backend_type = VHOST_BACKEND_TYPE_USER,
        .vhost_call = vhost_user_call,
        .vhost_backend_init = vhost_user_init,
        .vhost_backend_cleanup = vhost_user_cleanup
        };
Commit	Line	Data
5f6f6664 NN	1	/*
	2	* vhost-user
	3	*
	4	* Copyright (c) 2013 Virtual Open Systems Sarl.
	5	*
	6	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	7	* See the COPYING file in the top-level directory.
	8	*
	9	*/
	10
	11	#include "hw/virtio/vhost.h"
	12	#include "hw/virtio/vhost-backend.h"
	13	#include "sysemu/char.h"
	14	#include "sysemu/kvm.h"
	15	#include "qemu/error-report.h"
	16	#include "qemu/sockets.h"
3fd74b84	17	#include "exec/ram_addr.h"
5f6f6664 NN	18
	19	#include <fcntl.h>
	20	#include <unistd.h>
	21	#include <sys/ioctl.h>
	22	#include <sys/socket.h>
	23	#include <sys/un.h>
	24	#include <linux/vhost.h>
	25
	26	#define VHOST_MEMORY_MAX_NREGIONS 8
dcb10c00 MT	27	#define VHOST_USER_F_PROTOCOL_FEATURES 30
dcb10c00 MT	28	#define VHOST_USER_PROTOCOL_FEATURE_MASK 0x0ULL
5f6f6664 NN	29
	30	typedef enum VhostUserRequest {
	31	VHOST_USER_NONE = 0,
	32	VHOST_USER_GET_FEATURES = 1,
	33	VHOST_USER_SET_FEATURES = 2,
	34	VHOST_USER_SET_OWNER = 3,
	35	VHOST_USER_RESET_OWNER = 4,
	36	VHOST_USER_SET_MEM_TABLE = 5,
	37	VHOST_USER_SET_LOG_BASE = 6,
	38	VHOST_USER_SET_LOG_FD = 7,
	39	VHOST_USER_SET_VRING_NUM = 8,
	40	VHOST_USER_SET_VRING_ADDR = 9,
	41	VHOST_USER_SET_VRING_BASE = 10,
	42	VHOST_USER_GET_VRING_BASE = 11,
	43	VHOST_USER_SET_VRING_KICK = 12,
	44	VHOST_USER_SET_VRING_CALL = 13,
	45	VHOST_USER_SET_VRING_ERR = 14,
dcb10c00 MT	46	VHOST_USER_GET_PROTOCOL_FEATURES = 15,
dcb10c00 MT	47	VHOST_USER_SET_PROTOCOL_FEATURES = 16,
5f6f6664 NN	48	VHOST_USER_MAX
	49	} VhostUserRequest;
	50
	51	typedef struct VhostUserMemoryRegion {
	52	uint64_t guest_phys_addr;
	53	uint64_t memory_size;
	54	uint64_t userspace_addr;
3fd74b84	55	uint64_t mmap_offset;
5f6f6664 NN	56	} VhostUserMemoryRegion;
	57
	58	typedef struct VhostUserMemory {
	59	uint32_t nregions;
	60	uint32_t padding;
	61	VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
	62	} VhostUserMemory;
	63
	64	typedef struct VhostUserMsg {
	65	VhostUserRequest request;
	66
	67	#define VHOST_USER_VERSION_MASK (0x3)
	68	#define VHOST_USER_REPLY_MASK (0x1<<2)
	69	uint32_t flags;
	70	uint32_t size; /* the following payload size */
	71	union {
	72	#define VHOST_USER_VRING_IDX_MASK (0xff)
	73	#define VHOST_USER_VRING_NOFD_MASK (0x1<<8)
	74	uint64_t u64;
	75	struct vhost_vring_state state;
	76	struct vhost_vring_addr addr;
	77	VhostUserMemory memory;
	78	};
	79	} QEMU_PACKED VhostUserMsg;
	80
	81	static VhostUserMsg m __attribute__ ((unused));
	82	#define VHOST_USER_HDR_SIZE (sizeof(m.request) \
	83	+ sizeof(m.flags) \
	84	+ sizeof(m.size))
	85
	86	#define VHOST_USER_PAYLOAD_SIZE (sizeof(m) - VHOST_USER_HDR_SIZE)
	87
	88	/* The version of the protocol we support */
	89	#define VHOST_USER_VERSION (0x1)
	90
	91	static bool ioeventfd_enabled(void)
	92	{
	93	return kvm_enabled() && kvm_eventfds_enabled();
	94	}
	95
	96	static unsigned long int ioctl_to_vhost_user_request[VHOST_USER_MAX] = {
	97	-1, /* VHOST_USER_NONE */
	98	VHOST_GET_FEATURES, /* VHOST_USER_GET_FEATURES */
	99	VHOST_SET_FEATURES, /* VHOST_USER_SET_FEATURES */
	100	VHOST_SET_OWNER, /* VHOST_USER_SET_OWNER */
	101	VHOST_RESET_OWNER, /* VHOST_USER_RESET_OWNER */
	102	VHOST_SET_MEM_TABLE, /* VHOST_USER_SET_MEM_TABLE */
	103	VHOST_SET_LOG_BASE, /* VHOST_USER_SET_LOG_BASE */
	104	VHOST_SET_LOG_FD, /* VHOST_USER_SET_LOG_FD */
	105	VHOST_SET_VRING_NUM, /* VHOST_USER_SET_VRING_NUM */
	106	VHOST_SET_VRING_ADDR, /* VHOST_USER_SET_VRING_ADDR */
	107	VHOST_SET_VRING_BASE, /* VHOST_USER_SET_VRING_BASE */
	108	VHOST_GET_VRING_BASE, /* VHOST_USER_GET_VRING_BASE */
	109	VHOST_SET_VRING_KICK, /* VHOST_USER_SET_VRING_KICK */
	110	VHOST_SET_VRING_CALL, /* VHOST_USER_SET_VRING_CALL */
	111	VHOST_SET_VRING_ERR /* VHOST_USER_SET_VRING_ERR */
	112	};
	113
	114	static VhostUserRequest vhost_user_request_translate(unsigned long int request)
	115	{
	116	VhostUserRequest idx;
	117
	118	for (idx = 0; idx < VHOST_USER_MAX; idx++) {
	119	if (ioctl_to_vhost_user_request[idx] == request) {
120	break;
121	}
122	}
123
124	return (idx == VHOST_USER_MAX) ? VHOST_USER_NONE : idx;
125	}
126
127	static int vhost_user_read(struct vhost_dev dev, VhostUserMsg msg)
128	{
129	CharDriverState *chr = dev->opaque;
130	uint8_t p = (uint8_t ) msg;
131	int r, size = VHOST_USER_HDR_SIZE;
132
133	r = qemu_chr_fe_read_all(chr, p, size);
134	if (r != size) {
ab7c5aaf	135	error_report("Failed to read msg header. Read %d instead of %d.", r,
5f6f6664 NN	136	size);
	137	goto fail;
	138	}
	139
	140	/* validate received flags */
	141	if (msg->flags != (VHOST_USER_REPLY_MASK \| VHOST_USER_VERSION)) {
	142	error_report("Failed to read msg header."
ab7c5aaf	143	" Flags 0x%x instead of 0x%x.", msg->flags,
5f6f6664 NN	144	VHOST_USER_REPLY_MASK \| VHOST_USER_VERSION);
	145	goto fail;
	146	}
	147
	148	/* validate message size is sane */
	149	if (msg->size > VHOST_USER_PAYLOAD_SIZE) {
	150	error_report("Failed to read msg header."
ab7c5aaf	151	" Size %d exceeds the maximum %zu.", msg->size,
5f6f6664 NN	152	VHOST_USER_PAYLOAD_SIZE);
	153	goto fail;
	154	}
	155
	156	if (msg->size) {
	157	p += VHOST_USER_HDR_SIZE;
	158	size = msg->size;
	159	r = qemu_chr_fe_read_all(chr, p, size);
	160	if (r != size) {
	161	error_report("Failed to read msg payload."
ab7c5aaf	162	" Read %d instead of %d.", r, msg->size);
5f6f6664 NN	163	goto fail;
	164	}
	165	}
	166
	167	return 0;
	168
	169	fail:
	170	return -1;
	171	}
	172
	173	static int vhost_user_write(struct vhost_dev dev, VhostUserMsg msg,
	174	int *fds, int fd_num)
	175	{
	176	CharDriverState *chr = dev->opaque;
	177	int size = VHOST_USER_HDR_SIZE + msg->size;
	178
	179	if (fd_num) {
	180	qemu_chr_fe_set_msgfds(chr, fds, fd_num);
	181	}
	182
	183	return qemu_chr_fe_write_all(chr, (const uint8_t *) msg, size) == size ?
	184	0 : -1;
	185	}
	186
	187	static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
	188	void *arg)
	189	{
	190	VhostUserMsg msg;
	191	VhostUserRequest msg_request;
5f6f6664 NN	192	struct vhost_vring_file *file = 0;
	193	int need_reply = 0;
	194	int fds[VHOST_MEMORY_MAX_NREGIONS];
3fd74b84	195	int i, fd;
5f6f6664 NN	196	size_t fd_num = 0;
	197
	198	assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
	199
7305483a YL	200	/* only translate vhost ioctl requests */
	201	if (request > VHOST_USER_MAX) {
	202	msg_request = vhost_user_request_translate(request);
	203	} else {
	204	msg_request = request;
	205	}
	206
5f6f6664 NN	207	msg.request = msg_request;
	208	msg.flags = VHOST_USER_VERSION;
	209	msg.size = 0;
	210
7305483a YL	211	switch (msg_request) {
7305483a YL	212	case VHOST_USER_GET_FEATURES:
dcb10c00	213	case VHOST_USER_GET_PROTOCOL_FEATURES:
5f6f6664 NN	214	need_reply = 1;
	215	break;
	216
7305483a YL	217	case VHOST_USER_SET_FEATURES:
7305483a YL	218	case VHOST_USER_SET_LOG_BASE:
dcb10c00	219	case VHOST_USER_SET_PROTOCOL_FEATURES:
5f6f6664 NN	220	msg.u64 = ((__u64 ) arg);
	221	msg.size = sizeof(m.u64);
	222	break;
	223
7305483a YL	224	case VHOST_USER_SET_OWNER:
7305483a YL	225	case VHOST_USER_RESET_OWNER:
5f6f6664 NN	226	break;
5f6f6664 NN	227
7305483a	228	case VHOST_USER_SET_MEM_TABLE:
3fd74b84 DM	229	for (i = 0; i < dev->mem->nregions; ++i) {
3fd74b84 DM	230	struct vhost_memory_region *reg = dev->mem->regions + i;
f69a2805	231	ram_addr_t ram_addr;
cd98639f MT	232
	233	assert((uintptr_t)reg->userspace_addr == reg->userspace_addr);
	234	qemu_ram_addr_from_host((void *)(uintptr_t)reg->userspace_addr, &ram_addr);
f69a2805	235	fd = qemu_get_ram_fd(ram_addr);
3fd74b84 DM	236	if (fd > 0) {
	237	msg.memory.regions[fd_num].userspace_addr = reg->userspace_addr;
	238	msg.memory.regions[fd_num].memory_size = reg->memory_size;
	239	msg.memory.regions[fd_num].guest_phys_addr = reg->guest_phys_addr;
	240	msg.memory.regions[fd_num].mmap_offset = reg->userspace_addr -
d3f16ec8	241	(uintptr_t) qemu_get_ram_block_host_ptr(ram_addr);
3fd74b84 DM	242	assert(fd_num < VHOST_MEMORY_MAX_NREGIONS);
3fd74b84 DM	243	fds[fd_num++] = fd;
5f6f6664 NN	244	}
	245	}
	246
	247	msg.memory.nregions = fd_num;
	248
	249	if (!fd_num) {
ab7c5aaf GA	250	error_report("Failed initializing vhost-user memory map, "
ab7c5aaf GA	251	"consider using -object memory-backend-file share=on");
5f6f6664 NN	252	return -1;
	253	}
	254
	255	msg.size = sizeof(m.memory.nregions);
	256	msg.size += sizeof(m.memory.padding);
	257	msg.size += fd_num * sizeof(VhostUserMemoryRegion);
	258
	259	break;
	260
7305483a	261	case VHOST_USER_SET_LOG_FD:
5f6f6664 NN	262	fds[fd_num++] = ((int ) arg);
	263	break;
	264
7305483a YL	265	case VHOST_USER_SET_VRING_NUM:
7305483a YL	266	case VHOST_USER_SET_VRING_BASE:
5f6f6664 NN	267	memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
	268	msg.size = sizeof(m.state);
	269	break;
	270
7305483a	271	case VHOST_USER_GET_VRING_BASE:
5f6f6664 NN	272	memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
	273	msg.size = sizeof(m.state);
	274	need_reply = 1;
	275	break;
	276
7305483a	277	case VHOST_USER_SET_VRING_ADDR:
5f6f6664 NN	278	memcpy(&msg.addr, arg, sizeof(struct vhost_vring_addr));
	279	msg.size = sizeof(m.addr);
	280	break;
	281
7305483a YL	282	case VHOST_USER_SET_VRING_KICK:
	283	case VHOST_USER_SET_VRING_CALL:
	284	case VHOST_USER_SET_VRING_ERR:
5f6f6664	285	file = arg;
d345ed2d	286	msg.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
5f6f6664 NN	287	msg.size = sizeof(m.u64);
	288	if (ioeventfd_enabled() && file->fd > 0) {
	289	fds[fd_num++] = file->fd;
	290	} else {
	291	msg.u64 \|= VHOST_USER_VRING_NOFD_MASK;
	292	}
	293	break;
	294	default:
ab7c5aaf	295	error_report("vhost-user trying to send unhandled ioctl");
5f6f6664 NN	296	return -1;
	297	break;
	298	}
	299
	300	if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
	301	return 0;
	302	}
	303
	304	if (need_reply) {
	305	if (vhost_user_read(dev, &msg) < 0) {
	306	return 0;
	307	}
	308
	309	if (msg_request != msg.request) {
	310	error_report("Received unexpected msg type."
ab7c5aaf	311	" Expected %d received %d", msg_request, msg.request);
5f6f6664 NN	312	return -1;
	313	}
	314
	315	switch (msg_request) {
	316	case VHOST_USER_GET_FEATURES:
dcb10c00	317	case VHOST_USER_GET_PROTOCOL_FEATURES:
5f6f6664	318	if (msg.size != sizeof(m.u64)) {
ab7c5aaf	319	error_report("Received bad msg size.");
5f6f6664 NN	320	return -1;
	321	}
	322	((__u64 ) arg) = msg.u64;
	323	break;
	324	case VHOST_USER_GET_VRING_BASE:
	325	if (msg.size != sizeof(m.state)) {
ab7c5aaf	326	error_report("Received bad msg size.");
5f6f6664 NN	327	return -1;
	328	}
	329	memcpy(arg, &msg.state, sizeof(struct vhost_vring_state));
	330	break;
	331	default:
ab7c5aaf	332	error_report("Received unexpected msg type.");
5f6f6664 NN	333	return -1;
	334	break;
	335	}
	336	}
	337
	338	return 0;
	339	}
	340
	341	static int vhost_user_init(struct vhost_dev dev, void opaque)
	342	{
dcb10c00 MT	343	unsigned long long features;
	344	int err;
	345
5f6f6664 NN	346	assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
	347
	348	dev->opaque = opaque;
	349
dcb10c00 MT	350	err = vhost_user_call(dev, VHOST_USER_GET_FEATURES, &features);
	351	if (err < 0) {
	352	return err;
	353	}
	354
	355	if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) {
	356	dev->backend_features \|= 1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
	357
	358	err = vhost_user_call(dev, VHOST_USER_GET_PROTOCOL_FEATURES, &features);
	359	if (err < 0) {
	360	return err;
	361	}
	362
	363	dev->protocol_features = features & VHOST_USER_PROTOCOL_FEATURE_MASK;
	364	err = vhost_user_call(dev, VHOST_USER_SET_PROTOCOL_FEATURES,
	365	&dev->protocol_features);
	366	if (err < 0) {
	367	return err;
	368	}
	369	}
	370
5f6f6664 NN	371	return 0;
	372	}
	373
	374	static int vhost_user_cleanup(struct vhost_dev *dev)
	375	{
	376	assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
	377
	378	dev->opaque = 0;
	379
	380	return 0;
	381	}
	382
	383	const VhostOps user_ops = {
	384	.backend_type = VHOST_BACKEND_TYPE_USER,
	385	.vhost_call = vhost_user_call,
	386	.vhost_backend_init = vhost_user_init,
	387	.vhost_backend_cleanup = vhost_user_cleanup
	388	};