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qemu/hw/scsi/virtio-scsi.c
Stefan Hajnoczi bcede51d2d virtio-scsi: handle ctrl virtqueue in main loop 
Previously the ctrl virtqueue was handled in the AioContext where SCSI
requests are processed. When IOThread Virtqueue Mapping was added things
become more complicated because SCSI requests could run in other
AioContexts.

Simplify by handling the ctrl virtqueue in the main loop where reset
operations can be performed. Note that BHs are still used canceling SCSI
requests in their AioContexts but at least the mean loop activity
doesn't need BHs anymore.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20250311132616.1049687-13-stefanha@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2025-03-13 17:57:23 +01:00

1453 lines
44 KiB
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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 "qemu/osdep.h"
#include "qapi/error.h"
#include "standard-headers/linux/virtio_ids.h"
#include "hw/virtio/virtio-scsi.h"
#include "migration/qemu-file-types.h"
#include "qemu/defer-call.h"
#include "qemu/error-report.h"
#include "qemu/iov.h"
#include "qemu/module.h"
#include "system/block-backend.h"
#include "system/dma.h"
#include "hw/qdev-properties.h"
#include "hw/scsi/scsi.h"
#include "scsi/constants.h"
#include "hw/virtio/iothread-vq-mapping.h"
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/virtio-access.h"
#include "trace.h"
typedef struct VirtIOSCSIReq {
/*
* Note:
* - fields up to resp_iov are initialized by virtio_scsi_init_req;
* - fields starting at vring are zeroed by virtio_scsi_init_req.
*/
VirtQueueElement elem;
VirtIOSCSI *dev;
VirtQueue *vq;
QEMUSGList qsgl;
QEMUIOVector resp_iov;
/* Used for two-stage request submission and TMFs deferred to BH */
QTAILQ_ENTRY(VirtIOSCSIReq) next;
/* Used for cancellation of request during TMFs. Atomic. */
int remaining;
SCSIRequest *sreq;
size_t resp_size;
enum SCSIXferMode mode;
union {
VirtIOSCSICmdResp cmd;
VirtIOSCSICtrlTMFResp tmf;
VirtIOSCSICtrlANResp an;
VirtIOSCSIEvent event;
} resp;
union {
VirtIOSCSICmdReq cmd;
VirtIOSCSICtrlTMFReq tmf;
VirtIOSCSICtrlANReq an;
} req;
} VirtIOSCSIReq;
static inline int virtio_scsi_get_lun(uint8_t *lun)
{
return ((lun[2] << 8) | lun[3]) & 0x3FFF;
}
static inline SCSIDevice *virtio_scsi_device_get(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_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
}
static void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req)
{
VirtIODevice *vdev = VIRTIO_DEVICE(s);
const size_t zero_skip =
offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov);
req->vq = vq;
req->dev = s;
qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as);
qemu_iovec_init(&req->resp_iov, 1);
memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip);
}
static void virtio_scsi_free_req(VirtIOSCSIReq *req)
{
qemu_iovec_destroy(&req->resp_iov);
qemu_sglist_destroy(&req->qsgl);
g_free(req);
}
static void virtio_scsi_complete_req(VirtIOSCSIReq *req, QemuMutex *vq_lock)
{
VirtIOSCSI *s = req->dev;
VirtQueue *vq = req->vq;
VirtIODevice *vdev = VIRTIO_DEVICE(s);
qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size);
if (vq_lock) {
qemu_mutex_lock(vq_lock);
}
virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size);
if (s->dataplane_started && !s->dataplane_fenced) {
virtio_notify_irqfd(vdev, vq);
} else {
virtio_notify(vdev, vq);
}
if (vq_lock) {
qemu_mutex_unlock(vq_lock);
}
if (req->sreq) {
req->sreq->hba_private = NULL;
scsi_req_unref(req->sreq);
}
virtio_scsi_free_req(req);
}
static void virtio_scsi_bad_req(VirtIOSCSIReq *req, QemuMutex *vq_lock)
{
virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers");
if (vq_lock) {
qemu_mutex_lock(vq_lock);
}
virtqueue_detach_element(req->vq, &req->elem, 0);
if (vq_lock) {
qemu_mutex_unlock(vq_lock);
}
virtio_scsi_free_req(req);
}
static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov,
hwaddr *addr, int num, size_t skip)
{
QEMUSGList *qsgl = &req->qsgl;
size_t copied = 0;
while (num) {
if (skip >= iov->iov_len) {
skip -= iov->iov_len;
} else {
qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip);
copied += iov->iov_len - skip;
skip = 0;
}
iov++;
addr++;
num--;
}
assert(skip == 0);
return copied;
}
static int virtio_scsi_parse_req(VirtIOSCSIReq *req,
unsigned req_size, unsigned resp_size)
{
VirtIODevice *vdev = (VirtIODevice *) req->dev;
size_t in_size, out_size;
if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
&req->req, req_size) < req_size) {
return -EINVAL;
}
if (qemu_iovec_concat_iov(&req->resp_iov,
req->elem.in_sg, req->elem.in_num, 0,
resp_size) < resp_size) {
return -EINVAL;
}
req->resp_size = resp_size;
/* Old BIOSes left some padding by mistake after the req_size/resp_size.
* As a workaround, always consider the first buffer as the virtio-scsi
* request/response, making the payload start at the second element
* of the iovec.
*
* The actual length of the response header, stored in req->resp_size,
* does not change.
*
* TODO: always disable this workaround for virtio 1.0 devices.
*/
if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) {
if (req->elem.out_num) {
req_size = req->elem.out_sg[0].iov_len;
}
if (req->elem.in_num) {
resp_size = req->elem.in_sg[0].iov_len;
}
}
out_size = qemu_sgl_concat(req, req->elem.out_sg,
&req->elem.out_addr[0], req->elem.out_num,
req_size);
in_size = qemu_sgl_concat(req, req->elem.in_sg,
&req->elem.in_addr[0], req->elem.in_num,
resp_size);
if (out_size && in_size) {
return -ENOTSUP;
}
if (out_size) {
req->mode = SCSI_XFER_TO_DEV;
} else if (in_size) {
req->mode = SCSI_XFER_FROM_DEV;
}
return 0;
}
static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq, QemuMutex *vq_lock)
{
VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s;
VirtIOSCSIReq *req;
if (vq_lock) {
qemu_mutex_lock(vq_lock);
}
req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size);
if (vq_lock) {
qemu_mutex_unlock(vq_lock);
}
if (!req) {
return NULL;
}
virtio_scsi_init_req(s, vq, req);
return req;
}
static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
{
VirtIOSCSIReq *req = sreq->hba_private;
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev);
VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
uint32_t n = virtio_get_queue_index(req->vq) - VIRTIO_SCSI_VQ_NUM_FIXED;
assert(n < vs->conf.num_queues);
qemu_put_be32s(f, &n);
qemu_put_virtqueue_element(vdev, f, &req->elem);
}
static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
{
SCSIBus *bus = sreq->bus;
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
VirtIODevice *vdev = VIRTIO_DEVICE(s);
VirtIOSCSIReq *req;
uint32_t n;
qemu_get_be32s(f, &n);
assert(n < vs->conf.num_queues);
req = qemu_get_virtqueue_element(vdev, f,
sizeof(VirtIOSCSIReq) + vs->cdb_size);
virtio_scsi_init_req(s, vs->cmd_vqs[n], req);
if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) {
error_report("invalid SCSI request migration data");
exit(1);
}
scsi_req_ref(sreq);
req->sreq = sreq;
if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
assert(req->sreq->cmd.mode == req->mode);
}
return req;
}
typedef struct {
Notifier notifier;
VirtIOSCSIReq *tmf_req;
} VirtIOSCSICancelNotifier;
static void virtio_scsi_tmf_dec_remaining(VirtIOSCSIReq *tmf)
{
if (qatomic_fetch_dec(&tmf->remaining) == 1) {
trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(tmf->req.tmf.lun),
tmf->req.tmf.tag, tmf->resp.tmf.response);
virtio_scsi_complete_req(tmf, &tmf->dev->ctrl_lock);
}
}
static void virtio_scsi_cancel_notify(Notifier *notifier, void *data)
{
VirtIOSCSICancelNotifier *n = container_of(notifier,
VirtIOSCSICancelNotifier,
notifier);
virtio_scsi_tmf_dec_remaining(n->tmf_req);
g_free(n);
}
static void virtio_scsi_tmf_cancel_req(VirtIOSCSIReq *tmf, SCSIRequest *r)
{
VirtIOSCSICancelNotifier *notifier;
assert(r->ctx == qemu_get_current_aio_context());
/* Decremented in virtio_scsi_cancel_notify() */
qatomic_inc(&tmf->remaining);
notifier = g_new(VirtIOSCSICancelNotifier, 1);
notifier->notifier.notify = virtio_scsi_cancel_notify;
notifier->tmf_req = tmf;
scsi_req_cancel_async(r, &notifier->notifier);
}
/* Execute a TMF on the requests in the current AioContext */
static void virtio_scsi_do_tmf_aio_context(void *opaque)
{
AioContext *ctx = qemu_get_current_aio_context();
VirtIOSCSIReq *tmf = opaque;
VirtIOSCSI *s = tmf->dev;
SCSIDevice *d = virtio_scsi_device_get(s, tmf->req.tmf.lun);
SCSIRequest *r;
bool match_tag;
if (!d) {
tmf->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET;
virtio_scsi_tmf_dec_remaining(tmf);
return;
}
/*
* This function could handle other subtypes that need to be processed in
* the request's AioContext in the future, but for now only request
* cancelation subtypes are performed here.
*/
switch (tmf->req.tmf.subtype) {
case VIRTIO_SCSI_T_TMF_ABORT_TASK:
match_tag = true;
break;
case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
match_tag = false;
break;
default:
g_assert_not_reached();
}
WITH_QEMU_LOCK_GUARD(&d->requests_lock) {
QTAILQ_FOREACH(r, &d->requests, next) {
VirtIOSCSIReq *cmd_req = r->hba_private;
assert(cmd_req); /* request has hba_private while enqueued */
if (r->ctx != ctx) {
continue;
}
if (match_tag && cmd_req->req.cmd.tag != tmf->req.tmf.tag) {
continue;
}
virtio_scsi_tmf_cancel_req(tmf, r);
}
}
/* Incremented by virtio_scsi_do_tmf() */
virtio_scsi_tmf_dec_remaining(tmf);
object_unref(d);
}
static void dummy_bh(void *opaque)
{
/* Do nothing */
}
/*
* Wait for pending virtio_scsi_defer_tmf_to_aio_context() BHs.
*/
static void virtio_scsi_flush_defer_tmf_to_aio_context(VirtIOSCSI *s)
{
GLOBAL_STATE_CODE();
assert(!s->dataplane_started);
for (uint32_t i = 0; i < s->parent_obj.conf.num_queues; i++) {
AioContext *ctx = s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED + i];
/* Our BH only runs after previously scheduled BHs */
aio_wait_bh_oneshot(ctx, dummy_bh, NULL);
}
}
/*
* Run the TMF in a specific AioContext, handling only requests in that
* AioContext. This is necessary because requests can run in different
* AioContext and it is only possible to cancel them from the AioContext where
* they are running.
*/
static void virtio_scsi_defer_tmf_to_aio_context(VirtIOSCSIReq *tmf,
AioContext *ctx)
{
/* Decremented in virtio_scsi_do_tmf_aio_context() */
qatomic_inc(&tmf->remaining);
/* See virtio_scsi_flush_defer_tmf_to_aio_context() cleanup during reset */
aio_bh_schedule_oneshot(ctx, virtio_scsi_do_tmf_aio_context, tmf);
}
/*
* Returns the AioContext for a given TMF's tag field or NULL. Note that the
* request identified by the tag may have completed by the time you can execute
* a BH in the AioContext, so don't assume the request still exists in your BH.
*/
static AioContext *find_aio_context_for_tmf_tag(SCSIDevice *d,
VirtIOSCSIReq *tmf)
{
WITH_QEMU_LOCK_GUARD(&d->requests_lock) {
SCSIRequest *r;
SCSIRequest *next;
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
VirtIOSCSIReq *cmd_req = r->hba_private;
/* hba_private is non-NULL while the request is enqueued */
assert(cmd_req);
if (cmd_req->req.cmd.tag == tmf->req.tmf.tag) {
return r->ctx;
}
}
}
return NULL;
}
/* Return 0 if the request is ready to be completed and return to guest;
* -EINPROGRESS if the request is submitted and will be completed later, in the
* case of async cancellation. */
static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
{
SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun);
SCSIRequest *r, *next;
AioContext *ctx;
int ret = 0;
/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
req->resp.tmf.response = VIRTIO_SCSI_S_OK;
/*
* req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s()
* to avoid compiler errors.
*/
req->req.tmf.subtype =
virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype);
trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req->req.tmf.lun),
req->req.tmf.tag, req->req.tmf.subtype);
switch (req->req.tmf.subtype) {
case VIRTIO_SCSI_T_TMF_ABORT_TASK: {
if (!d) {
goto fail;
}
if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
goto incorrect_lun;
}
ctx = find_aio_context_for_tmf_tag(d, req);
if (ctx) {
virtio_scsi_defer_tmf_to_aio_context(req, ctx);
ret = -EINPROGRESS;
}
break;
}
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;
}
WITH_QEMU_LOCK_GUARD(&d->requests_lock) {
QTAILQ_FOREACH(r, &d->requests, next) {
VirtIOSCSIReq *cmd_req = r->hba_private;
assert(cmd_req); /* request has hba_private while enqueued */
if (cmd_req->req.cmd.tag == req->req.tmf.tag) {
/*
* "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;
}
}
}
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;
}
qatomic_inc(&s->resetting);
device_cold_reset(&d->qdev);
qatomic_dec(&s->resetting);
break;
case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET: {
BusChild *kid;
int target = req->req.tmf.lun[1];
qatomic_inc(&s->resetting);
rcu_read_lock();
QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) {
SCSIDevice *d1 = SCSI_DEVICE(kid->child);
if (d1->channel == 0 && d1->id == target) {
device_cold_reset(&d1->qdev);
}
}
rcu_read_unlock();
qatomic_dec(&s->resetting);
break;
}
case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET: {
g_autoptr(GHashTable) aio_contexts = g_hash_table_new(NULL, NULL);
if (!d) {
goto fail;
}
if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
goto incorrect_lun;
}
qatomic_inc(&req->remaining);
for (uint32_t i = 0; i < s->parent_obj.conf.num_queues; i++) {
ctx = s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED + i];
if (!g_hash_table_add(aio_contexts, ctx)) {
continue; /* skip previously added AioContext */
}
virtio_scsi_defer_tmf_to_aio_context(req, ctx);
}
virtio_scsi_tmf_dec_remaining(req);
ret = -EINPROGRESS;
break;
}
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;
}
WITH_QEMU_LOCK_GUARD(&d->requests_lock) {
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
/* Request has hba_private while enqueued */
assert(r->hba_private);
/*
* "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;
}
}
break;
case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
default:
req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
break;
}
object_unref(OBJECT(d));
return ret;
incorrect_lun:
req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN;
object_unref(OBJECT(d));
return ret;
fail:
req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET;
object_unref(OBJECT(d));
return ret;
}
static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req)
{
VirtIODevice *vdev = (VirtIODevice *)s;
uint32_t type;
int r = 0;
if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
&type, sizeof(type)) < sizeof(type)) {
virtio_scsi_bad_req(req, &s->ctrl_lock);
return;
}
virtio_tswap32s(vdev, &type);
if (type == VIRTIO_SCSI_T_TMF) {
if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq),
sizeof(VirtIOSCSICtrlTMFResp)) < 0) {
virtio_scsi_bad_req(req, &s->ctrl_lock);
return;
} else {
r = virtio_scsi_do_tmf(s, req);
}
} else if (type == VIRTIO_SCSI_T_AN_QUERY ||
type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq),
sizeof(VirtIOSCSICtrlANResp)) < 0) {
virtio_scsi_bad_req(req, &s->ctrl_lock);
return;
} else {
req->req.an.event_requested =
virtio_tswap32(VIRTIO_DEVICE(s), req->req.an.event_requested);
trace_virtio_scsi_an_req(virtio_scsi_get_lun(req->req.an.lun),
req->req.an.event_requested);
req->resp.an.event_actual = 0;
req->resp.an.response = VIRTIO_SCSI_S_OK;
}
}
if (r == 0) {
if (type == VIRTIO_SCSI_T_TMF)
trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun),
req->req.tmf.tag,
req->resp.tmf.response);
else if (type == VIRTIO_SCSI_T_AN_QUERY ||
type == VIRTIO_SCSI_T_AN_SUBSCRIBE)
trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req->req.an.lun),
req->resp.an.response);
virtio_scsi_complete_req(req, &s->ctrl_lock);
} else {
assert(r == -EINPROGRESS);
}
}
static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq)
{
VirtIOSCSIReq *req;
while ((req = virtio_scsi_pop_req(s, vq, &s->ctrl_lock))) {
virtio_scsi_handle_ctrl_req(s, req);
}
}
/*
* If dataplane is configured but not yet started, do so now and return true on
* success.
*
* Dataplane is started by the core virtio code but virtqueue handler functions
* can also be invoked when a guest kicks before DRIVER_OK, so this helper
* function helps us deal with manually starting ioeventfd in that case.
*/
static bool virtio_scsi_defer_to_dataplane(VirtIOSCSI *s)
{
if (s->dataplane_started) {
return false;
}
if (s->vq_aio_context[0] == qemu_get_aio_context()) {
return false; /* not using IOThreads */
}
virtio_device_start_ioeventfd(&s->parent_obj.parent_obj);
return !s->dataplane_fenced;
}
static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOSCSI *s = (VirtIOSCSI *)vdev;
if (virtio_scsi_defer_to_dataplane(s)) {
return;
}
virtio_scsi_handle_ctrl_vq(s, vq);
}
static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req)
{
trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req->req.cmd.lun),
req->req.cmd.tag,
req->resp.cmd.response,
req->resp.cmd.status);
/* Sense data is not in req->resp and is copied separately
* in virtio_scsi_command_complete.
*/
req->resp_size = sizeof(VirtIOSCSICmdResp);
virtio_scsi_complete_req(req, NULL);
}
static void virtio_scsi_command_failed(SCSIRequest *r)
{
VirtIOSCSIReq *req = r->hba_private;
if (r->io_canceled) {
return;
}
req->resp.cmd.status = GOOD;
switch (r->host_status) {
case SCSI_HOST_NO_LUN:
req->resp.cmd.response = VIRTIO_SCSI_S_INCORRECT_LUN;
break;
case SCSI_HOST_BUSY:
req->resp.cmd.response = VIRTIO_SCSI_S_BUSY;
break;
case SCSI_HOST_TIME_OUT:
case SCSI_HOST_ABORTED:
req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
break;
case SCSI_HOST_BAD_RESPONSE:
req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
break;
case SCSI_HOST_RESET:
req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
break;
case SCSI_HOST_TRANSPORT_DISRUPTED:
req->resp.cmd.response = VIRTIO_SCSI_S_TRANSPORT_FAILURE;
break;
case SCSI_HOST_TARGET_FAILURE:
req->resp.cmd.response = VIRTIO_SCSI_S_TARGET_FAILURE;
break;
case SCSI_HOST_RESERVATION_ERROR:
req->resp.cmd.response = VIRTIO_SCSI_S_NEXUS_FAILURE;
break;
case SCSI_HOST_ALLOCATION_FAILURE:
case SCSI_HOST_MEDIUM_ERROR:
case SCSI_HOST_ERROR:
default:
req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
break;
}
virtio_scsi_complete_cmd_req(req);
}
static void virtio_scsi_command_complete(SCSIRequest *r, size_t resid)
{
VirtIOSCSIReq *req = r->hba_private;
uint8_t sense[SCSI_SENSE_BUF_SIZE];
uint32_t sense_len;
VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
if (r->io_canceled) {
return;
}
req->resp.cmd.response = VIRTIO_SCSI_S_OK;
req->resp.cmd.status = r->status;
if (req->resp.cmd.status == GOOD) {
req->resp.cmd.resid = virtio_tswap32(vdev, resid);
} else {
req->resp.cmd.resid = 0;
sense_len = scsi_req_get_sense(r, sense, sizeof(sense));
sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd));
qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd),
sense, sense_len);
req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len);
}
virtio_scsi_complete_cmd_req(req);
}
static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
uint8_t *buf, size_t buf_len,
void *hba_private)
{
VirtIOSCSIReq *req = hba_private;
if (cmd->len == 0) {
cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE);
memcpy(cmd->buf, buf, cmd->len);
}
/* Extract the direction and mode directly from the request, for
* host device passthrough.
*/
cmd->xfer = req->qsgl.size;
cmd->mode = req->mode;
return 0;
}
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 (qatomic_read(&req->dev->resetting)) {
req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
} else {
req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
}
virtio_scsi_complete_cmd_req(req);
}
static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
{
req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
virtio_scsi_complete_cmd_req(req);
}
static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)
{
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
SCSIDevice *d;
int rc;
rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
sizeof(VirtIOSCSICmdResp) + vs->sense_size);
if (rc < 0) {
if (rc == -ENOTSUP) {
virtio_scsi_fail_cmd_req(req);
return -ENOTSUP;
} else {
virtio_scsi_bad_req(req, NULL);
return -EINVAL;
}
}
trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req->req.cmd.lun),
req->req.cmd.tag, req->req.cmd.cdb[0]);
d = virtio_scsi_device_get(s, req->req.cmd.lun);
if (!d) {
req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
virtio_scsi_complete_cmd_req(req);
return -ENOENT;
}
req->sreq = scsi_req_new(d, req->req.cmd.tag,
virtio_scsi_get_lun(req->req.cmd.lun),
req->req.cmd.cdb, vs->cdb_size, req);
if (req->sreq->cmd.mode != SCSI_XFER_NONE
&& (req->sreq->cmd.mode != req->mode ||
req->sreq->cmd.xfer > req->qsgl.size)) {
req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN;
virtio_scsi_complete_cmd_req(req);
object_unref(OBJECT(d));
return -ENOBUFS;
}
scsi_req_ref(req->sreq);
defer_call_begin();
object_unref(OBJECT(d));
return 0;
}
static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req)
{
SCSIRequest *sreq = req->sreq;
if (scsi_req_enqueue(sreq)) {
scsi_req_continue(sreq);
}
defer_call_end();
scsi_req_unref(sreq);
}
static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq)
{
VirtIOSCSIReq *req, *next;
int ret = 0;
bool suppress_notifications = virtio_queue_get_notification(vq);
QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs);
do {
if (suppress_notifications) {
virtio_queue_set_notification(vq, 0);
}
while ((req = virtio_scsi_pop_req(s, vq, NULL))) {
ret = virtio_scsi_handle_cmd_req_prepare(s, req);
if (!ret) {
QTAILQ_INSERT_TAIL(&reqs, req, next);
} else if (ret == -EINVAL) {
/* The device is broken and shouldn't process any request */
while (!QTAILQ_EMPTY(&reqs)) {
req = QTAILQ_FIRST(&reqs);
QTAILQ_REMOVE(&reqs, req, next);
defer_call_end();
scsi_req_unref(req->sreq);
virtqueue_detach_element(req->vq, &req->elem, 0);
virtio_scsi_free_req(req);
}
}
}
if (suppress_notifications) {
virtio_queue_set_notification(vq, 1);
}
} while (ret != -EINVAL && !virtio_queue_empty(vq));
QTAILQ_FOREACH_SAFE(req, &reqs, next, next) {
virtio_scsi_handle_cmd_req_submit(s, req);
}
}
static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
{
/* use non-QOM casts in the data path */
VirtIOSCSI *s = (VirtIOSCSI *)vdev;
if (virtio_scsi_defer_to_dataplane(s)) {
return;
}
virtio_scsi_handle_cmd_vq(s, vq);
}
static void virtio_scsi_get_config(VirtIODevice *vdev,
uint8_t *config)
{
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev);
virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues);
virtio_stl_p(vdev, &scsiconf->seg_max,
s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2);
virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors);
virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size);
virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size);
virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
}
static void virtio_scsi_set_config(VirtIODevice *vdev,
const uint8_t *config)
{
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 ||
(uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) {
virtio_error(vdev,
"bad data written to virtio-scsi configuration space");
return;
}
vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size);
vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size);
}
static uint64_t virtio_scsi_get_features(VirtIODevice *vdev,
uint64_t requested_features,
Error **errp)
{
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
/* Firstly sync all virtio-scsi possible supported features */
requested_features |= s->host_features;
return requested_features;
}
static void virtio_scsi_reset(VirtIODevice *vdev)
{
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
assert(!s->dataplane_started);
virtio_scsi_flush_defer_tmf_to_aio_context(s);
qatomic_inc(&s->resetting);
bus_cold_reset(BUS(&s->bus));
qatomic_dec(&s->resetting);
vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
WITH_QEMU_LOCK_GUARD(&s->event_lock) {
s->events_dropped = false;
}
}
typedef struct {
uint32_t event;
uint32_t reason;
union {
/* Used by messages specific to a device */
struct {
uint32_t id;
uint32_t lun;
} address;
};
} VirtIOSCSIEventInfo;
static void virtio_scsi_push_event(VirtIOSCSI *s,
const VirtIOSCSIEventInfo *info)
{
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
VirtIOSCSIReq *req;
VirtIOSCSIEvent *evt;
VirtIODevice *vdev = VIRTIO_DEVICE(s);
uint32_t event = info->event;
uint32_t reason = info->reason;
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return;
}
req = virtio_scsi_pop_req(s, vs->event_vq, &s->event_lock);
WITH_QEMU_LOCK_GUARD(&s->event_lock) {
if (!req) {
s->events_dropped = true;
return;
}
if (s->events_dropped) {
event |= VIRTIO_SCSI_T_EVENTS_MISSED;
s->events_dropped = false;
}
}
if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) {
virtio_scsi_bad_req(req, &s->event_lock);
return;
}
evt = &req->resp.event;
memset(evt, 0, sizeof(VirtIOSCSIEvent));
evt->event = virtio_tswap32(vdev, event);
evt->reason = virtio_tswap32(vdev, reason);
if (event != VIRTIO_SCSI_T_EVENTS_MISSED) {
evt->lun[0] = 1;
evt->lun[1] = info->address.id;
/* Linux wants us to keep the same encoding we use for REPORT LUNS. */
if (info->address.lun >= 256) {
evt->lun[2] = (info->address.lun >> 8) | 0x40;
}
evt->lun[3] = info->address.lun & 0xFF;
}
trace_virtio_scsi_event(virtio_scsi_get_lun(evt->lun), event, reason);
virtio_scsi_complete_req(req, &s->event_lock);
}
static void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq)
{
bool events_dropped;
WITH_QEMU_LOCK_GUARD(&s->event_lock) {
events_dropped = s->events_dropped;
}
if (events_dropped) {
VirtIOSCSIEventInfo info = {
.event = VIRTIO_SCSI_T_NO_EVENT,
};
virtio_scsi_push_event(s, &info);
}
}
static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
if (virtio_scsi_defer_to_dataplane(s)) {
return;
}
virtio_scsi_handle_event_vq(s, vq);
}
static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
{
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
VirtIODevice *vdev = VIRTIO_DEVICE(s);
if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) &&
dev->type != TYPE_ROM) {
VirtIOSCSIEventInfo info = {
.event = VIRTIO_SCSI_T_PARAM_CHANGE,
.reason = sense.asc | (sense.ascq << 8),
.address = {
.id = dev->id,
.lun = dev->lun,
},
};
virtio_scsi_push_event(s, &info);
}
}
static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
SCSIDevice *sd = SCSI_DEVICE(dev);
sd->hba_supports_iothread = true;
}
static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
AioContext *ctx = s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED];
SCSIDevice *sd = SCSI_DEVICE(dev);
if (ctx != qemu_get_aio_context() && !s->dataplane_fenced) {
/*
* Try to make the BlockBackend's AioContext match ours. Ignore failure
* because I/O will still work although block jobs and other users
* might be slower when multiple AioContexts use a BlockBackend.
*/
blk_set_aio_context(sd->conf.blk, ctx, NULL);
}
if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
VirtIOSCSIEventInfo info = {
.event = VIRTIO_SCSI_T_TRANSPORT_RESET,
.reason = VIRTIO_SCSI_EVT_RESET_RESCAN,
.address = {
.id = sd->id,
.lun = sd->lun,
},
};
virtio_scsi_push_event(s, &info);
scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
}
}
static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
SCSIDevice *sd = SCSI_DEVICE(dev);
VirtIOSCSIEventInfo info = {
.event = VIRTIO_SCSI_T_TRANSPORT_RESET,
.reason = VIRTIO_SCSI_EVT_RESET_REMOVED,
.address = {
.id = sd->id,
.lun = sd->lun,
},
};
qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
if (s->vq_aio_context[VIRTIO_SCSI_VQ_NUM_FIXED] != qemu_get_aio_context()) {
/* If other users keep the BlockBackend in the iothread, that's ok */
blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL);
}
if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
virtio_scsi_push_event(s, &info);
scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
}
}
/* Suspend virtqueue ioeventfd processing during drain */
static void virtio_scsi_drained_begin(SCSIBus *bus)
{
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
VirtIODevice *vdev = VIRTIO_DEVICE(s);
uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED +
s->parent_obj.conf.num_queues;
/*
* Drain is called when stopping dataplane but the host notifier has
* already been detached. Detaching multiple times is a no-op if nothing
* else is using the monitoring same file descriptor, but avoid it just in
* case.
*
* Also, don't detach if dataplane has not even been started yet because
* the host notifier isn't attached.
*/
if (s->dataplane_stopping || !s->dataplane_started) {
return;
}
for (uint32_t i = 0; i < total_queues; i++) {
VirtQueue *vq = virtio_get_queue(vdev, i);
virtio_queue_aio_detach_host_notifier(vq, s->vq_aio_context[i]);
}
}
/* Resume virtqueue ioeventfd processing after drain */
static void virtio_scsi_drained_end(SCSIBus *bus)
{
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
VirtIODevice *vdev = VIRTIO_DEVICE(s);
uint32_t total_queues = VIRTIO_SCSI_VQ_NUM_FIXED +
s->parent_obj.conf.num_queues;
/*
* Drain is called when stopping dataplane. Keep the host notifier detached
* so it's not left dangling after dataplane is stopped.
*
* Also, don't attach if dataplane has not even been started yet. We're not
* ready.
*/
if (s->dataplane_stopping || !s->dataplane_started) {
return;
}
for (uint32_t i = 0; i < total_queues; i++) {
VirtQueue *vq = virtio_get_queue(vdev, i);
AioContext *ctx = s->vq_aio_context[i];
if (vq == vs->event_vq) {
virtio_queue_aio_attach_host_notifier_no_poll(vq, ctx);
} else {
virtio_queue_aio_attach_host_notifier(vq, ctx);
}
}
}
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,
.fail = virtio_scsi_command_failed,
.cancel = virtio_scsi_request_cancelled,
.change = virtio_scsi_change,
.parse_cdb = virtio_scsi_parse_cdb,
.get_sg_list = virtio_scsi_get_sg_list,
.save_request = virtio_scsi_save_request,
.load_request = virtio_scsi_load_request,
.drained_begin = virtio_scsi_drained_begin,
.drained_end = virtio_scsi_drained_end,
};
void virtio_scsi_common_realize(DeviceState *dev,
VirtIOHandleOutput ctrl,
VirtIOHandleOutput evt,
VirtIOHandleOutput cmd,
Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev);
int i;
virtio_init(vdev, VIRTIO_ID_SCSI, sizeof(VirtIOSCSIConfig));
if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
s->conf.num_queues = 1;
}
if (s->conf.num_queues == 0 ||
s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) {
error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
"must be a positive integer less than %d.",
s->conf.num_queues,
VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED);
virtio_cleanup(vdev);
return;
}
if (s->conf.virtqueue_size <= 2) {
error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), "
"must be > 2", s->conf.virtqueue_size);
return;
}
s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues);
s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl);
s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt);
for (i = 0; i < s->conf.num_queues; i++) {
s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd);
}
}
static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOSCSI *s = VIRTIO_SCSI(dev);
Error *err = NULL;
qemu_mutex_init(&s->ctrl_lock);
qemu_mutex_init(&s->event_lock);
virtio_scsi_common_realize(dev,
virtio_scsi_handle_ctrl,
virtio_scsi_handle_event,
virtio_scsi_handle_cmd,
&err);
if (err != NULL) {
error_propagate(errp, err);
return;
}
scsi_bus_init_named(&s->bus, sizeof(s->bus), dev,
&virtio_scsi_scsi_info, vdev->bus_name);
/* override default SCSI bus hotplug-handler, with virtio-scsi's one */
qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev));
virtio_scsi_dataplane_setup(s, errp);
}
void virtio_scsi_common_unrealize(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
int i;
virtio_delete_queue(vs->ctrl_vq);
virtio_delete_queue(vs->event_vq);
for (i = 0; i < vs->conf.num_queues; i++) {
virtio_delete_queue(vs->cmd_vqs[i]);
}
g_free(vs->cmd_vqs);
virtio_cleanup(vdev);
}
/* main loop */
static void virtio_scsi_device_unrealize(DeviceState *dev)
{
VirtIOSCSI *s = VIRTIO_SCSI(dev);
virtio_scsi_dataplane_cleanup(s);
qbus_set_hotplug_handler(BUS(&s->bus), NULL);
virtio_scsi_common_unrealize(dev);
qemu_mutex_destroy(&s->event_lock);
qemu_mutex_destroy(&s->ctrl_lock);
}
static const Property virtio_scsi_properties[] = {
DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues,
VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI,
parent_obj.conf.virtqueue_size, 256),
DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI,
parent_obj.conf.seg_max_adjust, true),
DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors,
0xFFFF),
DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun,
128),
DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features,
VIRTIO_SCSI_F_HOTPLUG, true),
DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features,
VIRTIO_SCSI_F_CHANGE, true),
DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread,
TYPE_IOTHREAD, IOThread *),
DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST("iothread-vq-mapping", VirtIOSCSI,
parent_obj.conf.iothread_vq_mapping_list),
};
static const VMStateDescription vmstate_virtio_scsi = {
.name = "virtio-scsi",
.minimum_version_id = 1,
.version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_VIRTIO_DEVICE,
VMSTATE_END_OF_LIST()
},
};
static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
{
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
vdc->get_config = virtio_scsi_get_config;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
}
static void virtio_scsi_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
device_class_set_props(dc, virtio_scsi_properties);
dc->vmsd = &vmstate_virtio_scsi;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
vdc->realize = virtio_scsi_device_realize;
vdc->unrealize = virtio_scsi_device_unrealize;
vdc->set_config = virtio_scsi_set_config;
vdc->get_features = virtio_scsi_get_features;
vdc->reset = virtio_scsi_reset;
vdc->start_ioeventfd = virtio_scsi_dataplane_start;
vdc->stop_ioeventfd = virtio_scsi_dataplane_stop;
hc->pre_plug = virtio_scsi_pre_hotplug;
hc->plug = virtio_scsi_hotplug;
hc->unplug = virtio_scsi_hotunplug;
}
static const TypeInfo virtio_scsi_common_info = {
.name = TYPE_VIRTIO_SCSI_COMMON,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VirtIOSCSICommon),
.abstract = true,
.class_init = virtio_scsi_common_class_init,
};
static const TypeInfo virtio_scsi_info = {
.name = TYPE_VIRTIO_SCSI,
.parent = TYPE_VIRTIO_SCSI_COMMON,
.instance_size = sizeof(VirtIOSCSI),
.class_init = virtio_scsi_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_HOTPLUG_HANDLER },
{ }
}
};
static void virtio_register_types(void)
{
type_register_static(&virtio_scsi_common_info);
type_register_static(&virtio_scsi_info);
}
type_init(virtio_register_types)
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