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xemu/hw/virtio-scsi.c
Paolo Bonzini 619d7ae952 virtio-scsi: do not crash on adding buffers to the event queue 
The event queue is not supported yet and the handler does not
have to do much anyway when buffers are added.  However, the
handler is called unconditionally by the virtio layer, and this
results in a crash as soon as buffers are added to the event
queue because we pass NULL.

Reported-by: Bryan Venteicher <bryanv@daemoninthecloset.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-07-02 11:27:00 +02:00

639 lines
19 KiB
C
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/*
* 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;
SCSIBus bus;
uint32_t sense_size;
uint32_t cdb_size;
int resetting;
VirtQueue *ctrl_vq;
VirtQueue *event_vq;
VirtQueue *cmd_vqs[0];
} 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 inline int virtio_scsi_get_lun(uint8_t *lun)
{
return ((lun[2] << 8) | lun[3]) & 0x3FFF;
}
static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun)
{
if (lun[0] != 1) {
return NULL;
}
if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
return NULL;
}
return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
}
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_save_request(QEMUFile *f, SCSIRequest *sreq)
{
VirtIOSCSIReq *req = sreq->hba_private;
uint32_t n = virtio_queue_get_id(req->vq) - 2;
assert(n < req->dev->conf->num_queues);
qemu_put_be32s(f, &n);
qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
}
static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
{
SCSIBus *bus = sreq->bus;
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
VirtIOSCSIReq *req;
uint32_t n;
req = g_malloc(sizeof(*req));
qemu_get_be32s(f, &n);
assert(n < s->conf->num_queues);
qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
virtio_scsi_parse_req(s, s->cmd_vqs[n], req);
scsi_req_ref(sreq);
req->sreq = sreq;
if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
int req_mode =
(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
assert(req->sreq->cmd.mode == req_mode);
}
return req;
}
static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
{
SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun);
SCSIRequest *r, *next;
BusChild *kid;
int target;
/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
req->resp.tmf->response = VIRTIO_SCSI_S_OK;
switch (req->req.tmf->subtype) {
case VIRTIO_SCSI_T_TMF_ABORT_TASK:
case VIRTIO_SCSI_T_TMF_QUERY_TASK:
if (!d) {
goto fail;
}
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
goto incorrect_lun;
}
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
if (r->tag == req->req.tmf->tag) {
break;
}
}
if (r && r->hba_private) {
if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
/* "If the specified command is present in the task set, then
* return a service response set to FUNCTION SUCCEEDED".
*/
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
} else {
scsi_req_cancel(r);
}
}
break;
case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
if (!d) {
goto fail;
}
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
goto incorrect_lun;
}
s->resetting++;
qdev_reset_all(&d->qdev);
s->resetting--;
break;
case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
if (!d) {
goto fail;
}
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
goto incorrect_lun;
}
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
if (r->hba_private) {
if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
/* "If there is any command present in the task set, then
* return a service response set to FUNCTION SUCCEEDED".
*/
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
break;
} else {
scsi_req_cancel(r);
}
}
}
break;
case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
target = req->req.tmf->lun[1];
s->resetting++;
QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
d = DO_UPCAST(SCSIDevice, qdev, kid->child);
if (d->channel == 0 && d->id == target) {
qdev_reset_all(&d->qdev);
}
}
s->resetting--;
break;
case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
default:
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
break;
}
return;
incorrect_lun:
req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN;
return;
fail:
req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET;
}
static void virtio_scsi_handle_ctrl(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();
continue;
}
out_size = req->elem.out_sg[0].iov_len;
in_size = req->elem.in_sg[0].iov_len;
if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
if (out_size < sizeof(VirtIOSCSICtrlTMFReq) ||
in_size < sizeof(VirtIOSCSICtrlTMFResp)) {
virtio_scsi_bad_req();
}
virtio_scsi_do_tmf(s, req);
} else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY ||
req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
if (out_size < sizeof(VirtIOSCSICtrlANReq) ||
in_size < sizeof(VirtIOSCSICtrlANResp)) {
virtio_scsi_bad_req();
}
req->resp.an->event_actual = 0;
req->resp.an->response = VIRTIO_SCSI_S_OK;
}
virtio_scsi_complete_req(req);
}
}
static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
{
}
static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
size_t resid)
{
VirtIOSCSIReq *req = r->hba_private;
req->resp.cmd->response = VIRTIO_SCSI_S_OK;
req->resp.cmd->status = status;
if (req->resp.cmd->status == GOOD) {
req->resp.cmd->resid = resid;
} else {
req->resp.cmd->resid = 0;
req->resp.cmd->sense_len =
scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE);
}
virtio_scsi_complete_req(req);
}
static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
{
VirtIOSCSIReq *req = r->hba_private;
return &req->qsgl;
}
static void virtio_scsi_request_cancelled(SCSIRequest *r)
{
VirtIOSCSIReq *req = r->hba_private;
if (!req) {
return;
}
if (req->dev->resetting) {
req->resp.cmd->response = VIRTIO_SCSI_S_RESET;
} else {
req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED;
}
virtio_scsi_complete_req(req);
}
static void virtio_scsi_fail_cmd_req(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;
int n;
while ((req = virtio_scsi_pop_req(s, vq))) {
SCSIDevice *d;
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(req);
continue;
}
d = virtio_scsi_device_find(s, req->req.cmd->lun);
if (!d) {
req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET;
virtio_scsi_complete_req(req);
continue;
}
req->sreq = scsi_req_new(d, req->req.cmd->tag,
virtio_scsi_get_lun(req->req.cmd->lun),
req->req.cmd->cdb, req);
if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
int req_mode =
(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
if (req->sreq->cmd.mode != req_mode ||
req->sreq->cmd.xfer > req->qsgl.size) {
req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN;
virtio_scsi_complete_req(req);
continue;
}
}
n = scsi_req_enqueue(req->sreq);
if (n) {
scsi_req_continue(req->sreq);
}
}
}
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;
}
/* The device does not have anything to save beyond the virtio data.
* Request data is saved with callbacks from SCSI devices.
*/
static void virtio_scsi_save(QEMUFile *f, void *opaque)
{
VirtIOSCSI *s = opaque;
virtio_save(&s->vdev, f);
}
static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIOSCSI *s = opaque;
int ret;
ret = virtio_load(&s->vdev, f);
if (ret) {
return ret;
}
return 0;
}
static struct SCSIBusInfo virtio_scsi_scsi_info = {
.tcq = true,
.max_channel = VIRTIO_SCSI_MAX_CHANNEL,
.max_target = VIRTIO_SCSI_MAX_TARGET,
.max_lun = VIRTIO_SCSI_MAX_LUN,
.complete = virtio_scsi_command_complete,
.cancel = virtio_scsi_request_cancelled,
.get_sg_list = virtio_scsi_get_sg_list,
.save_request = virtio_scsi_save_request,
.load_request = virtio_scsi_load_request,
};
VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
{
VirtIOSCSI *s;
static int virtio_scsi_id;
size_t sz;
int i;
sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *);
s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
sizeof(VirtIOSCSIConfig), sz);
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,
virtio_scsi_handle_event);
for (i = 0; i < s->conf->num_queues; i++) {
s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
virtio_scsi_handle_cmd);
}
scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info);
if (!dev->hotplugged) {
scsi_bus_legacy_handle_cmdline(&s->bus);
}
register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
virtio_scsi_save, virtio_scsi_load, s);
return &s->vdev;
}
void virtio_scsi_exit(VirtIODevice *vdev)
{
VirtIOSCSI *s = (VirtIOSCSI *)vdev;
unregister_savevm(s->qdev, "virtio-scsi", s);
virtio_cleanup(vdev);
}
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