[qemu.git] / hw / virtio-scsi.c

/*
 * Virtio SCSI HBA
 *
 * Copyright IBM, Corp. 2010
 * Copyright Red Hat, Inc. 2011
 *
 * Authors:
 *   Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
 *   Paolo Bonzini      <pbonzini@redhat.com>
 *
 * 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 "virtio-scsi.h"
#include <hw/scsi.h>
#include <hw/scsi-defs.h>

#define VIRTIO_SCSI_VQ_SIZE     128
#define VIRTIO_SCSI_CDB_SIZE    32
#define VIRTIO_SCSI_SENSE_SIZE  96
#define VIRTIO_SCSI_MAX_CHANNEL 0
#define VIRTIO_SCSI_MAX_TARGET  255
#define VIRTIO_SCSI_MAX_LUN     16383

/* Response codes */
#define VIRTIO_SCSI_S_OK                       0
#define VIRTIO_SCSI_S_OVERRUN                  1
#define VIRTIO_SCSI_S_ABORTED                  2
#define VIRTIO_SCSI_S_BAD_TARGET               3
#define VIRTIO_SCSI_S_RESET                    4
#define VIRTIO_SCSI_S_BUSY                     5
#define VIRTIO_SCSI_S_TRANSPORT_FAILURE        6
#define VIRTIO_SCSI_S_TARGET_FAILURE           7
#define VIRTIO_SCSI_S_NEXUS_FAILURE            8
#define VIRTIO_SCSI_S_FAILURE                  9
#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED       10
#define VIRTIO_SCSI_S_FUNCTION_REJECTED        11
#define VIRTIO_SCSI_S_INCORRECT_LUN            12

/* Controlq type codes.  */
#define VIRTIO_SCSI_T_TMF                      0
#define VIRTIO_SCSI_T_AN_QUERY                 1
#define VIRTIO_SCSI_T_AN_SUBSCRIBE             2

/* Valid TMF subtypes.  */
#define VIRTIO_SCSI_T_TMF_ABORT_TASK           0
#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET       1
#define VIRTIO_SCSI_T_TMF_CLEAR_ACA            2
#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET       3
#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET      4
#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET   5
#define VIRTIO_SCSI_T_TMF_QUERY_TASK           6
#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET       7

/* Events.  */
#define VIRTIO_SCSI_T_EVENTS_MISSED            0x80000000
#define VIRTIO_SCSI_T_NO_EVENT                 0
#define VIRTIO_SCSI_T_TRANSPORT_RESET          1
#define VIRTIO_SCSI_T_ASYNC_NOTIFY             2

/* SCSI command request, followed by data-out */
typedef struct {
    uint8_t lun[8];              /* Logical Unit Number */
    uint64_t tag;                /* Command identifier */
    uint8_t task_attr;           /* Task attribute */
    uint8_t prio;
    uint8_t crn;
    uint8_t cdb[];
} QEMU_PACKED VirtIOSCSICmdReq;

/* Response, followed by sense data and data-in */
typedef struct {
    uint32_t sense_len;          /* Sense data length */
    uint32_t resid;              /* Residual bytes in data buffer */
    uint16_t status_qualifier;   /* Status qualifier */
    uint8_t status;              /* Command completion status */
    uint8_t response;            /* Response values */
    uint8_t sense[];
} QEMU_PACKED VirtIOSCSICmdResp;

/* Task Management Request */
typedef struct {
    uint32_t type;
    uint32_t subtype;
    uint8_t lun[8];
    uint64_t tag;
} QEMU_PACKED VirtIOSCSICtrlTMFReq;

typedef struct {
    uint8_t response;
} QEMU_PACKED VirtIOSCSICtrlTMFResp;

/* Asynchronous notification query/subscription */
typedef struct {
    uint32_t type;
    uint8_t lun[8];
    uint32_t event_requested;
} QEMU_PACKED VirtIOSCSICtrlANReq;

typedef struct {
    uint32_t event_actual;
    uint8_t response;
} QEMU_PACKED VirtIOSCSICtrlANResp;

typedef struct {
    uint32_t event;
    uint8_t lun[8];
    uint32_t reason;
} QEMU_PACKED VirtIOSCSIEvent;

typedef struct {
    uint32_t num_queues;
    uint32_t seg_max;
    uint32_t max_sectors;
    uint32_t cmd_per_lun;
    uint32_t event_info_size;
    uint32_t sense_size;
    uint32_t cdb_size;
    uint16_t max_channel;
    uint16_t max_target;
    uint32_t max_lun;
} QEMU_PACKED VirtIOSCSIConfig;

typedef struct {
    VirtIODevice vdev;
    DeviceState *qdev;
    VirtIOSCSIConf *conf;

    VirtQueue *ctrl_vq;
    VirtQueue *event_vq;
    VirtQueue *cmd_vq;
    uint32_t sense_size;
    uint32_t cdb_size;
} VirtIOSCSI;

typedef struct VirtIOSCSIReq {
    VirtIOSCSI *dev;
    VirtQueue *vq;
    VirtQueueElement elem;
    QEMUSGList qsgl;
    SCSIRequest *sreq;
    union {
        char                  *buf;
        VirtIOSCSICmdReq      *cmd;
        VirtIOSCSICtrlTMFReq  *tmf;
        VirtIOSCSICtrlANReq   *an;
    } req;
    union {
        char                  *buf;
        VirtIOSCSICmdResp     *cmd;
        VirtIOSCSICtrlTMFResp *tmf;
        VirtIOSCSICtrlANResp  *an;
        VirtIOSCSIEvent       *event;
    } resp;
} VirtIOSCSIReq;

static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
{
    VirtIOSCSI *s = req->dev;
    VirtQueue *vq = req->vq;
    virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
    qemu_sglist_destroy(&req->qsgl);
    if (req->sreq) {
        req->sreq->hba_private = NULL;
        scsi_req_unref(req->sreq);
    }
    g_free(req);
    virtio_notify(&s->vdev, vq);
}

static void virtio_scsi_bad_req(void)
{
    error_report("wrong size for virtio-scsi headers");
    exit(1);
}

static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg,
                                   target_phys_addr_t *addr, int num)
{
    memset(qsgl, 0, sizeof(*qsgl));
    while (num--) {
        qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
    }
}

static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq,
                                  VirtIOSCSIReq *req)
{
    assert(req->elem.out_num && req->elem.in_num);
    req->vq = vq;
    req->dev = s;
    req->sreq = NULL;
    req->req.buf = req->elem.out_sg[0].iov_base;
    req->resp.buf = req->elem.in_sg[0].iov_base;

    if (req->elem.out_num > 1) {
        qemu_sgl_init_external(&req->qsgl, &req->elem.out_sg[1],
                               &req->elem.out_addr[1],
                               req->elem.out_num - 1);
    } else {
        qemu_sgl_init_external(&req->qsgl, &req->elem.in_sg[1],
                               &req->elem.in_addr[1],
                               req->elem.in_num - 1);
    }
}

static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
{
    VirtIOSCSIReq *req;
    req = g_malloc(sizeof(*req));
    if (!virtqueue_pop(vq, &req->elem)) {
        g_free(req);
        return NULL;
    }

    virtio_scsi_parse_req(s, vq, req);
    return req;
}

static void virtio_scsi_fail_ctrl_req(VirtIOSCSIReq *req)
{
    if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
        req->resp.tmf->response = VIRTIO_SCSI_S_FAILURE;
    } else {
        req->resp.an->response = VIRTIO_SCSI_S_FAILURE;
    }

    virtio_scsi_complete_req(req);
}

static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIOSCSI *s = (VirtIOSCSI *)vdev;
    VirtIOSCSIReq *req;

    while ((req = virtio_scsi_pop_req(s, vq))) {
        virtio_scsi_fail_ctrl_req(req);
    }
}

static void virtio_scsi_fail_cmd_req(VirtIOSCSI *s, VirtIOSCSIReq *req)
{
    req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE;
    virtio_scsi_complete_req(req);
}

static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIOSCSI *s = (VirtIOSCSI *)vdev;
    VirtIOSCSIReq *req;

    while ((req = virtio_scsi_pop_req(s, vq))) {
        int out_size, in_size;
        if (req->elem.out_num < 1 || req->elem.in_num < 1) {
            virtio_scsi_bad_req();
        }

        out_size = req->elem.out_sg[0].iov_len;
        in_size = req->elem.in_sg[0].iov_len;
        if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size ||
            in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) {
            virtio_scsi_bad_req();
        }

        if (req->elem.out_num > 1 && req->elem.in_num > 1) {
            virtio_scsi_fail_cmd_req(s, req);
            continue;
        }

        req->resp.cmd->resid = 0;
        req->resp.cmd->status_qualifier = 0;
        req->resp.cmd->status = CHECK_CONDITION;
        req->resp.cmd->sense_len = 4;
        req->resp.cmd->sense[0] = 0xf0; /* Fixed format current sense */
        req->resp.cmd->sense[1] = ILLEGAL_REQUEST;
        req->resp.cmd->sense[2] = 0x20;
        req->resp.cmd->sense[3] = 0x00;
        req->resp.cmd->response = VIRTIO_SCSI_S_OK;

        virtio_scsi_complete_req(req);
    }
}

static void virtio_scsi_get_config(VirtIODevice *vdev,
                                   uint8_t *config)
{
    VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
    VirtIOSCSI *s = (VirtIOSCSI *)vdev;

    stl_raw(&scsiconf->num_queues, s->conf->num_queues);
    stl_raw(&scsiconf->seg_max, 128 - 2);
    stl_raw(&scsiconf->max_sectors, s->conf->max_sectors);
    stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun);
    stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
    stl_raw(&scsiconf->sense_size, s->sense_size);
    stl_raw(&scsiconf->cdb_size, s->cdb_size);
    stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
    stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
    stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
}

static void virtio_scsi_set_config(VirtIODevice *vdev,
                                   const uint8_t *config)
{
    VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
    VirtIOSCSI *s = (VirtIOSCSI *)vdev;

    if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 ||
        (uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
        error_report("bad data written to virtio-scsi configuration space");
        exit(1);
    }

    s->sense_size = ldl_raw(&scsiconf->sense_size);
    s->cdb_size = ldl_raw(&scsiconf->cdb_size);
}

static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
                                         uint32_t requested_features)
{
    return requested_features;
}

static void virtio_scsi_reset(VirtIODevice *vdev)
{
    VirtIOSCSI *s = (VirtIOSCSI *)vdev;

    s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
    s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
}

VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
{
    VirtIOSCSI *s;

    s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
                                         sizeof(VirtIOSCSIConfig),
                                         sizeof(VirtIOSCSI));

    s->qdev = dev;
    s->conf = proxyconf;

    /* TODO set up vdev function pointers */
    s->vdev.get_config = virtio_scsi_get_config;
    s->vdev.set_config = virtio_scsi_set_config;
    s->vdev.get_features = virtio_scsi_get_features;
    s->vdev.reset = virtio_scsi_reset;

    s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
                                   virtio_scsi_handle_ctrl);
    s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
                                   NULL);
    s->cmd_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
                                   virtio_scsi_handle_cmd);

    /* TODO savevm */

    return &s->vdev;
}

void virtio_scsi_exit(VirtIODevice *vdev)
{
    virtio_cleanup(vdev);
}
Commit	Line	Data
973abc7f SH	1	/*
	2	* Virtio SCSI HBA
	3	*
	4	* Copyright IBM, Corp. 2010
	5	* Copyright Red Hat, Inc. 2011
	6	*
	7	* Authors:
	8	* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
	9	* Paolo Bonzini <pbonzini@redhat.com>
	10	*
	11	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	12	* See the COPYING file in the top-level directory.
	13	*
	14	*/
	15
	16	#include "virtio-scsi.h"
	17	#include <hw/scsi.h>
	18	#include <hw/scsi-defs.h>
	19
	20	#define VIRTIO_SCSI_VQ_SIZE 128
	21	#define VIRTIO_SCSI_CDB_SIZE 32
	22	#define VIRTIO_SCSI_SENSE_SIZE 96
	23	#define VIRTIO_SCSI_MAX_CHANNEL 0
	24	#define VIRTIO_SCSI_MAX_TARGET 255
	25	#define VIRTIO_SCSI_MAX_LUN 16383
	26
	27	/* Response codes */
	28	#define VIRTIO_SCSI_S_OK 0
	29	#define VIRTIO_SCSI_S_OVERRUN 1
	30	#define VIRTIO_SCSI_S_ABORTED 2
	31	#define VIRTIO_SCSI_S_BAD_TARGET 3
	32	#define VIRTIO_SCSI_S_RESET 4
	33	#define VIRTIO_SCSI_S_BUSY 5
	34	#define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6
	35	#define VIRTIO_SCSI_S_TARGET_FAILURE 7
	36	#define VIRTIO_SCSI_S_NEXUS_FAILURE 8
	37	#define VIRTIO_SCSI_S_FAILURE 9
	38	#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10
	39	#define VIRTIO_SCSI_S_FUNCTION_REJECTED 11
	40	#define VIRTIO_SCSI_S_INCORRECT_LUN 12
	41
	42	/* Controlq type codes. */
	43	#define VIRTIO_SCSI_T_TMF 0
	44	#define VIRTIO_SCSI_T_AN_QUERY 1
	45	#define VIRTIO_SCSI_T_AN_SUBSCRIBE 2
	46
	47	/* Valid TMF subtypes. */
	48	#define VIRTIO_SCSI_T_TMF_ABORT_TASK 0
	49	#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1
	50	#define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2
	51	#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3
	52	#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4
	53	#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5
	54	#define VIRTIO_SCSI_T_TMF_QUERY_TASK 6
	55	#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7
	56
	57	/* Events. */
	58	#define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000
	59	#define VIRTIO_SCSI_T_NO_EVENT 0
	60	#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
	61	#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
	62
	63	/* SCSI command request, followed by data-out */
	64	typedef struct {
65	uint8_t lun[8]; /* Logical Unit Number */
66	uint64_t tag; /* Command identifier */
67	uint8_t task_attr; /* Task attribute */
68	uint8_t prio;
69	uint8_t crn;
70	uint8_t cdb[];
71	} QEMU_PACKED VirtIOSCSICmdReq;
72
73	/* Response, followed by sense data and data-in */
74	typedef struct {
75	uint32_t sense_len; /* Sense data length */
76	uint32_t resid; /* Residual bytes in data buffer */
77	uint16_t status_qualifier; /* Status qualifier */
78	uint8_t status; /* Command completion status */
79	uint8_t response; /* Response values */
80	uint8_t sense[];
81	} QEMU_PACKED VirtIOSCSICmdResp;
82
83	/* Task Management Request */
84	typedef struct {
85	uint32_t type;
86	uint32_t subtype;
87	uint8_t lun[8];
88	uint64_t tag;
89	} QEMU_PACKED VirtIOSCSICtrlTMFReq;
90
91	typedef struct {
92	uint8_t response;
93	} QEMU_PACKED VirtIOSCSICtrlTMFResp;
94
95	/* Asynchronous notification query/subscription */
96	typedef struct {
97	uint32_t type;
98	uint8_t lun[8];
99	uint32_t event_requested;
100	} QEMU_PACKED VirtIOSCSICtrlANReq;
101
102	typedef struct {
103	uint32_t event_actual;
104	uint8_t response;
105	} QEMU_PACKED VirtIOSCSICtrlANResp;
106
107	typedef struct {
108	uint32_t event;
109	uint8_t lun[8];
110	uint32_t reason;
111	} QEMU_PACKED VirtIOSCSIEvent;
112
113	typedef struct {
114	uint32_t num_queues;
115	uint32_t seg_max;
116	uint32_t max_sectors;
117	uint32_t cmd_per_lun;
118	uint32_t event_info_size;
119	uint32_t sense_size;
120	uint32_t cdb_size;
121	uint16_t max_channel;
122	uint16_t max_target;
123	uint32_t max_lun;
124	} QEMU_PACKED VirtIOSCSIConfig;
125
126	typedef struct {
127	VirtIODevice vdev;
128	DeviceState *qdev;
129	VirtIOSCSIConf *conf;
130
131	VirtQueue *ctrl_vq;
132	VirtQueue *event_vq;
133	VirtQueue *cmd_vq;
134	uint32_t sense_size;
135	uint32_t cdb_size;
136	} VirtIOSCSI;
137
326799c0 SH	138	typedef struct VirtIOSCSIReq {
	139	VirtIOSCSI *dev;
	140	VirtQueue *vq;
	141	VirtQueueElement elem;
	142	QEMUSGList qsgl;
	143	SCSIRequest *sreq;
	144	union {
	145	char *buf;
	146	VirtIOSCSICmdReq *cmd;
	147	VirtIOSCSICtrlTMFReq *tmf;
	148	VirtIOSCSICtrlANReq *an;
	149	} req;
	150	union {
	151	char *buf;
	152	VirtIOSCSICmdResp *cmd;
	153	VirtIOSCSICtrlTMFResp *tmf;
	154	VirtIOSCSICtrlANResp *an;
	155	VirtIOSCSIEvent *event;
	156	} resp;
	157	} VirtIOSCSIReq;
	158
	159	static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
	160	{
	161	VirtIOSCSI *s = req->dev;
	162	VirtQueue *vq = req->vq;
	163	virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
	164	qemu_sglist_destroy(&req->qsgl);
	165	if (req->sreq) {
	166	req->sreq->hba_private = NULL;
	167	scsi_req_unref(req->sreq);
	168	}
	169	g_free(req);
	170	virtio_notify(&s->vdev, vq);
	171	}
	172
	173	static void virtio_scsi_bad_req(void)
	174	{
	175	error_report("wrong size for virtio-scsi headers");
	176	exit(1);
	177	}
	178
	179	static void qemu_sgl_init_external(QEMUSGList qsgl, struct iovec sg,
	180	target_phys_addr_t *addr, int num)
	181	{
	182	memset(qsgl, 0, sizeof(*qsgl));
	183	while (num--) {
	184	qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
	185	}
	186	}
	187
	188	static void virtio_scsi_parse_req(VirtIOSCSI s, VirtQueue vq,
	189	VirtIOSCSIReq *req)
	190	{
	191	assert(req->elem.out_num && req->elem.in_num);
	192	req->vq = vq;
	193	req->dev = s;
	194	req->sreq = NULL;
	195	req->req.buf = req->elem.out_sg[0].iov_base;
	196	req->resp.buf = req->elem.in_sg[0].iov_base;
	197
	198	if (req->elem.out_num > 1) {
	199	qemu_sgl_init_external(&req->qsgl, &req->elem.out_sg[1],
	200	&req->elem.out_addr[1],
	201	req->elem.out_num - 1);
202	} else {
203	qemu_sgl_init_external(&req->qsgl, &req->elem.in_sg[1],
204	&req->elem.in_addr[1],
205	req->elem.in_num - 1);
206	}
207	}
208
209	static VirtIOSCSIReq virtio_scsi_pop_req(VirtIOSCSI s, VirtQueue *vq)
210	{
211	VirtIOSCSIReq *req;
212	req = g_malloc(sizeof(*req));
213	if (!virtqueue_pop(vq, &req->elem)) {
214	g_free(req);
215	return NULL;
216	}
217
218	virtio_scsi_parse_req(s, vq, req);
219	return req;
220	}
221
222	static void virtio_scsi_fail_ctrl_req(VirtIOSCSIReq *req)
223	{
224	if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
225	req->resp.tmf->response = VIRTIO_SCSI_S_FAILURE;
226	} else {
227	req->resp.an->response = VIRTIO_SCSI_S_FAILURE;
228	}
229
230	virtio_scsi_complete_req(req);
231	}
232
973abc7f SH	233	static void virtio_scsi_handle_ctrl(VirtIODevice vdev, VirtQueue vq)
973abc7f SH	234	{
326799c0 SH	235	VirtIOSCSI s = (VirtIOSCSI )vdev;
	236	VirtIOSCSIReq *req;
	237
	238	while ((req = virtio_scsi_pop_req(s, vq))) {
	239	virtio_scsi_fail_ctrl_req(req);
	240	}
	241	}
	242
	243	static void virtio_scsi_fail_cmd_req(VirtIOSCSI s, VirtIOSCSIReq req)
	244	{
	245	req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE;
	246	virtio_scsi_complete_req(req);
973abc7f SH	247	}
	248
	249	static void virtio_scsi_handle_cmd(VirtIODevice vdev, VirtQueue vq)
	250	{
326799c0 SH	251	VirtIOSCSI s = (VirtIOSCSI )vdev;
	252	VirtIOSCSIReq *req;
	253
	254	while ((req = virtio_scsi_pop_req(s, vq))) {
	255	int out_size, in_size;
	256	if (req->elem.out_num < 1 \|\| req->elem.in_num < 1) {
	257	virtio_scsi_bad_req();
	258	}
	259
	260	out_size = req->elem.out_sg[0].iov_len;
	261	in_size = req->elem.in_sg[0].iov_len;
	262	if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size \|\|
	263	in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) {
	264	virtio_scsi_bad_req();
	265	}
	266
	267	if (req->elem.out_num > 1 && req->elem.in_num > 1) {
	268	virtio_scsi_fail_cmd_req(s, req);
	269	continue;
	270	}
	271
	272	req->resp.cmd->resid = 0;
	273	req->resp.cmd->status_qualifier = 0;
	274	req->resp.cmd->status = CHECK_CONDITION;
	275	req->resp.cmd->sense_len = 4;
	276	req->resp.cmd->sense[0] = 0xf0; /* Fixed format current sense */
	277	req->resp.cmd->sense[1] = ILLEGAL_REQUEST;
	278	req->resp.cmd->sense[2] = 0x20;
	279	req->resp.cmd->sense[3] = 0x00;
	280	req->resp.cmd->response = VIRTIO_SCSI_S_OK;
	281
	282	virtio_scsi_complete_req(req);
	283	}
973abc7f SH	284	}
	285
	286	static void virtio_scsi_get_config(VirtIODevice *vdev,
	287	uint8_t *config)
	288	{
	289	VirtIOSCSIConfig scsiconf = (VirtIOSCSIConfig )config;
	290	VirtIOSCSI s = (VirtIOSCSI )vdev;
	291
	292	stl_raw(&scsiconf->num_queues, s->conf->num_queues);
	293	stl_raw(&scsiconf->seg_max, 128 - 2);
	294	stl_raw(&scsiconf->max_sectors, s->conf->max_sectors);
	295	stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun);
	296	stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
	297	stl_raw(&scsiconf->sense_size, s->sense_size);
	298	stl_raw(&scsiconf->cdb_size, s->cdb_size);
	299	stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
	300	stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
	301	stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
	302	}
	303
	304	static void virtio_scsi_set_config(VirtIODevice *vdev,
	305	const uint8_t *config)
	306	{
	307	VirtIOSCSIConfig scsiconf = (VirtIOSCSIConfig )config;
	308	VirtIOSCSI s = (VirtIOSCSI )vdev;
	309
	310	if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 \|\|
	311	(uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
	312	error_report("bad data written to virtio-scsi configuration space");
	313	exit(1);
	314	}
	315
	316	s->sense_size = ldl_raw(&scsiconf->sense_size);
	317	s->cdb_size = ldl_raw(&scsiconf->cdb_size);
	318	}
	319
	320	static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
	321	uint32_t requested_features)
	322	{
	323	return requested_features;
	324	}
	325
	326	static void virtio_scsi_reset(VirtIODevice *vdev)
	327	{
	328	VirtIOSCSI s = (VirtIOSCSI )vdev;
	329
	330	s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
	331	s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
	332	}
	333
	334	VirtIODevice virtio_scsi_init(DeviceState dev, VirtIOSCSIConf *proxyconf)
	335	{
	336	VirtIOSCSI *s;
	337
	338	s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
	339	sizeof(VirtIOSCSIConfig),
	340	sizeof(VirtIOSCSI));
	341
	342	s->qdev = dev;
	343	s->conf = proxyconf;
	344
	345	/* TODO set up vdev function pointers */
	346	s->vdev.get_config = virtio_scsi_get_config;
	347	s->vdev.set_config = virtio_scsi_set_config;
348	s->vdev.get_features = virtio_scsi_get_features;
349	s->vdev.reset = virtio_scsi_reset;
350
351	s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
352	virtio_scsi_handle_ctrl);
353	s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
354	NULL);
355	s->cmd_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
356	virtio_scsi_handle_cmd);
357
358	/* TODO savevm */
359
360	return &s->vdev;
361	}
362
363	void virtio_scsi_exit(VirtIODevice *vdev)
364	{
365	virtio_cleanup(vdev);
366	}