#include "qemu/osdep.h"
#include "qemu/cutils.h"
+#include "qemu/option.h"
#include "qapi/error.h"
+#include "qapi/qapi-commands-block-core.h"
+#include "qapi/qapi-commands-misc.h"
+#include "qapi/qapi-visit-block-core.h"
+#include "qapi/qobject-input-visitor.h"
#include "qapi/visitor.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qstring.h"
#include "hw/hw.h"
#include "hw/xen/xen_common.h"
#include "hw/block/xen_blkif.h"
#include "hw/xen/xen-block.h"
+#include "hw/xen/xen-backend.h"
#include "sysemu/blockdev.h"
#include "sysemu/block-backend.h"
#include "sysemu/iothread.h"
DeviceClass *dev_class = DEVICE_CLASS(class);
XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class);
+ xendev_class->backend = "qdisk";
xendev_class->device = "vbd";
xendev_class->get_name = xen_block_get_name;
xendev_class->realize = xen_block_realize;
}
type_init(xen_block_register_types)
+
+static void xen_block_blockdev_del(const char *node_name, Error **errp)
+{
+ trace_xen_block_blockdev_del(node_name);
+
+ qmp_blockdev_del(node_name, errp);
+}
+
+static char *xen_block_blockdev_add(const char *id, QDict *qdict,
+ Error **errp)
+{
+ const char *driver = qdict_get_try_str(qdict, "driver");
+ BlockdevOptions *options = NULL;
+ Error *local_err = NULL;
+ char *node_name;
+ Visitor *v;
+
+ if (!driver) {
+ error_setg(errp, "no 'driver' parameter");
+ return NULL;
+ }
+
+ node_name = g_strdup_printf("%s-%s", id, driver);
+ qdict_put_str(qdict, "node-name", node_name);
+
+ trace_xen_block_blockdev_add(node_name);
+
+ v = qobject_input_visitor_new(QOBJECT(qdict));
+ visit_type_BlockdevOptions(v, NULL, &options, &local_err);
+ visit_free(v);
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto fail;
+ }
+
+ qmp_blockdev_add(options, &local_err);
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto fail;
+ }
+
+ qapi_free_BlockdevOptions(options);
+
+ return node_name;
+
+fail:
+ if (options) {
+ qapi_free_BlockdevOptions(options);
+ }
+ g_free(node_name);
+
+ return NULL;
+}
+
+static void xen_block_drive_destroy(XenBlockDrive *drive, Error **errp)
+{
+ char *node_name = drive->node_name;
+
+ if (node_name) {
+ Error *local_err = NULL;
+
+ xen_block_blockdev_del(node_name, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ g_free(node_name);
+ drive->node_name = NULL;
+ }
+ g_free(drive->id);
+ g_free(drive);
+}
+
+static XenBlockDrive *xen_block_drive_create(const char *id,
+ const char *device_type,
+ QDict *opts, Error **errp)
+{
+ const char *params = qdict_get_try_str(opts, "params");
+ const char *mode = qdict_get_try_str(opts, "mode");
+ const char *direct_io_safe = qdict_get_try_str(opts, "direct-io-safe");
+ const char *discard_enable = qdict_get_try_str(opts, "discard-enable");
+ char *driver = NULL;
+ char *filename = NULL;
+ XenBlockDrive *drive = NULL;
+ Error *local_err = NULL;
+ QDict *file_layer;
+ QDict *driver_layer;
+
+ if (params) {
+ char **v = g_strsplit(params, ":", 2);
+
+ if (v[1] == NULL) {
+ filename = g_strdup(v[0]);
+ driver = g_strdup("raw");
+ } else {
+ if (strcmp(v[0], "aio") == 0) {
+ driver = g_strdup("raw");
+ } else if (strcmp(v[0], "vhd") == 0) {
+ driver = g_strdup("vpc");
+ } else {
+ driver = g_strdup(v[0]);
+ }
+ filename = g_strdup(v[1]);
+ }
+
+ g_strfreev(v);
+ }
+
+ if (!filename) {
+ error_setg(errp, "no filename");
+ goto done;
+ }
+ assert(driver);
+
+ drive = g_new0(XenBlockDrive, 1);
+ drive->id = g_strdup(id);
+
+ file_layer = qdict_new();
+
+ qdict_put_str(file_layer, "driver", "file");
+ qdict_put_str(file_layer, "filename", filename);
+
+ if (mode && *mode != 'w') {
+ qdict_put_bool(file_layer, "read-only", true);
+ }
+
+ if (direct_io_safe) {
+ unsigned long value;
+
+ if (!qemu_strtoul(direct_io_safe, NULL, 2, &value) && !!value) {
+ QDict *cache_qdict = qdict_new();
+
+ qdict_put_bool(cache_qdict, "direct", true);
+ qdict_put_obj(file_layer, "cache", QOBJECT(cache_qdict));
+
+ qdict_put_str(file_layer, "aio", "native");
+ }
+ }
+
+ if (discard_enable) {
+ unsigned long value;
+
+ if (!qemu_strtoul(discard_enable, NULL, 2, &value) && !!value) {
+ qdict_put_str(file_layer, "discard", "unmap");
+ }
+ }
+
+ /*
+ * It is necessary to turn file locking off as an emulated device
+ * may have already opened the same image file.
+ */
+ qdict_put_str(file_layer, "locking", "off");
+
+ driver_layer = qdict_new();
+
+ qdict_put_str(driver_layer, "driver", driver);
+ qdict_put_obj(driver_layer, "file", QOBJECT(file_layer));
+
+ g_assert(!drive->node_name);
+ drive->node_name = xen_block_blockdev_add(drive->id, driver_layer,
+ &local_err);
+
+done:
+ g_free(driver);
+ g_free(filename);
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ xen_block_drive_destroy(drive, NULL);
+ return NULL;
+ }
+
+ return drive;
+}
+
+static const char *xen_block_drive_get_node_name(XenBlockDrive *drive)
+{
+ return drive->node_name ? drive->node_name : "";
+}
+
+static void xen_block_iothread_destroy(XenBlockIOThread *iothread,
+ Error **errp)
+{
+ qmp_object_del(iothread->id, errp);
+
+ g_free(iothread->id);
+ g_free(iothread);
+}
+
+static XenBlockIOThread *xen_block_iothread_create(const char *id,
+ Error **errp)
+{
+ XenBlockIOThread *iothread = g_new(XenBlockIOThread, 1);
+ Error *local_err = NULL;
+
+ iothread->id = g_strdup(id);
+
+ qmp_object_add(TYPE_IOTHREAD, id, false, NULL, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+
+ g_free(iothread->id);
+ g_free(iothread);
+ return NULL;
+ }
+
+ return iothread;
+}
+
+static void xen_block_device_create(XenBackendInstance *backend,
+ QDict *opts, Error **errp)
+{
+ XenBus *xenbus = xen_backend_get_bus(backend);
+ const char *name = xen_backend_get_name(backend);
+ unsigned long number;
+ const char *vdev, *device_type;
+ XenBlockDrive *drive = NULL;
+ XenBlockIOThread *iothread = NULL;
+ XenDevice *xendev = NULL;
+ Error *local_err = NULL;
+ const char *type;
+ XenBlockDevice *blockdev;
+
+ if (qemu_strtoul(name, NULL, 10, &number)) {
+ error_setg(errp, "failed to parse name '%s'", name);
+ goto fail;
+ }
+
+ trace_xen_block_device_create(number);
+
+ vdev = qdict_get_try_str(opts, "dev");
+ if (!vdev) {
+ error_setg(errp, "no dev parameter");
+ goto fail;
+ }
+
+ device_type = qdict_get_try_str(opts, "device-type");
+ if (!device_type) {
+ error_setg(errp, "no device-type parameter");
+ goto fail;
+ }
+
+ if (!strcmp(device_type, "disk")) {
+ type = TYPE_XEN_DISK_DEVICE;
+ } else if (!strcmp(device_type, "cdrom")) {
+ type = TYPE_XEN_CDROM_DEVICE;
+ } else {
+ error_setg(errp, "invalid device-type parameter '%s'", device_type);
+ goto fail;
+ }
+
+ drive = xen_block_drive_create(vdev, device_type, opts, &local_err);
+ if (!drive) {
+ error_propagate_prepend(errp, local_err, "failed to create drive: ");
+ goto fail;
+ }
+
+ iothread = xen_block_iothread_create(vdev, &local_err);
+ if (local_err) {
+ error_propagate_prepend(errp, local_err,
+ "failed to create iothread: ");
+ goto fail;
+ }
+
+ xendev = XEN_DEVICE(qdev_create(BUS(xenbus), type));
+ blockdev = XEN_BLOCK_DEVICE(xendev);
+
+ object_property_set_str(OBJECT(xendev), vdev, "vdev", &local_err);
+ if (local_err) {
+ error_propagate_prepend(errp, local_err, "failed to set 'vdev': ");
+ goto fail;
+ }
+
+ object_property_set_str(OBJECT(xendev),
+ xen_block_drive_get_node_name(drive), "drive",
+ &local_err);
+ if (local_err) {
+ error_propagate_prepend(errp, local_err, "failed to set 'drive': ");
+ goto fail;
+ }
+
+ object_property_set_str(OBJECT(xendev), iothread->id, "iothread",
+ &local_err);
+ if (local_err) {
+ error_propagate_prepend(errp, local_err,
+ "failed to set 'iothread': ");
+ goto fail;
+ }
+
+ blockdev->iothread = iothread;
+ blockdev->drive = drive;
+
+ object_property_set_bool(OBJECT(xendev), true, "realized", &local_err);
+ if (local_err) {
+ error_propagate_prepend(errp, local_err,
+ "realization of device %s failed: ",
+ type);
+ goto fail;
+ }
+
+ xen_backend_set_device(backend, xendev);
+ return;
+
+fail:
+ if (xendev) {
+ object_unparent(OBJECT(xendev));
+ }
+
+ if (iothread) {
+ xen_block_iothread_destroy(iothread, NULL);
+ }
+
+ if (drive) {
+ xen_block_drive_destroy(drive, NULL);
+ }
+}
+
+static void xen_block_device_destroy(XenBackendInstance *backend,
+ Error **errp)
+{
+ XenDevice *xendev = xen_backend_get_device(backend);
+ XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
+ XenBlockVdev *vdev = &blockdev->props.vdev;
+ XenBlockDrive *drive = blockdev->drive;
+ XenBlockIOThread *iothread = blockdev->iothread;
+
+ trace_xen_block_device_destroy(vdev->number);
+
+ object_unparent(OBJECT(xendev));
+
+ if (iothread) {
+ Error *local_err = NULL;
+
+ xen_block_iothread_destroy(iothread, &local_err);
+ if (local_err) {
+ error_propagate_prepend(errp, local_err,
+ "failed to destroy iothread: ");
+ return;
+ }
+ }
+
+ if (drive) {
+ Error *local_err = NULL;
+
+ xen_block_drive_destroy(drive, &local_err);
+ if (local_err) {
+ error_propagate_prepend(errp, local_err,
+ "failed to destroy drive: ");
+ }
+ }
+}
+
+static const XenBackendInfo xen_block_backend_info = {
+ .type = "qdisk",
+ .create = xen_block_device_create,
+ .destroy = xen_block_device_destroy,
+};
+
+static void xen_block_register_backend(void)
+{
+ xen_backend_register(&xen_block_backend_info);
+}
+
+xen_backend_init(xen_block_register_backend);
projects / qemu.git / commitdiff