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GET /api/patches/2224050/?format=api
{ "id": 2224050, "url": "http://patchwork.ozlabs.org/api/patches/2224050/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260416173448.88831-1-rafettaskindev@gmail.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260416173448.88831-1-rafettaskindev@gmail.com>", "list_archive_url": null, "date": "2026-04-16T17:34:48", "name": "[RFC] hw/scsi: Add SCSI tape device emulation", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "6d8e7301042651b39913b3dce43d53f327333267", "submitter": { "id": 93170, "url": "http://patchwork.ozlabs.org/api/people/93170/?format=api", "name": "Rafet T", "email": "rafettaskindev@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260416173448.88831-1-rafettaskindev@gmail.com/mbox/", "series": [ { "id": 500191, "url": "http://patchwork.ozlabs.org/api/series/500191/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500191", "date": "2026-04-16T17:34:48", "name": "[RFC] hw/scsi: Add SCSI tape device emulation", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500191/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224050/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224050/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=iHIjQx8b;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=mail-wm1-x334.google.com", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Add initial emulation of SCSI tape device supporting basic\nINQUIRY operation for now.\n\nHi, I am a GSoC 2026 applicant and this is my first patch.\nAny feedback or corrections appreciated.\n\nSigned-off-by: rft0 <rafettaskindev@gmail.com>\n---\n hw/scsi/meson.build | 1 +\n hw/scsi/scsi-tape.c | 334 ++++++++++++++++++++++++++++++++++++++++++++\n 2 files changed, 335 insertions(+)\n create mode 100644 hw/scsi/scsi-tape.c", "diff": "diff --git a/hw/scsi/meson.build b/hw/scsi/meson.build\nindex 69fde0cf84..1699b6e591 100644\n--- a/hw/scsi/meson.build\n+++ b/hw/scsi/meson.build\n@@ -7,6 +7,7 @@ scsi_ss.add(files(\n 'scsi-bus.c',\n 'scsi-disk.c',\n 'scsi-generic.c',\n+ 'scsi-tape.c',\n ))\n scsi_ss.add(when: 'CONFIG_ESP', if_true: files('esp.c'))\n scsi_ss.add(when: 'CONFIG_ESP_PCI', if_true: files('esp-pci.c'))\ndiff --git a/hw/scsi/scsi-tape.c b/hw/scsi/scsi-tape.c\nnew file mode 100644\nindex 0000000000..e457167649\n--- /dev/null\n+++ b/hw/scsi/scsi-tape.c\n@@ -0,0 +1,334 @@\n+/*\n+ * SCSI Tape Device emulation\n+ *\n+ * SPDX-License-Identifier: GPL-2.0-or-later\n+ *\n+ * Written by Rafet Taskin <rafettaskindev@gmail.com>\n+ *\n+ * SCSI Tape device emulation.\n+ *\n+ */\n+\n+#include \"qemu/hw-version.h\"\n+#include \"qemu/osdep.h\"\n+#include \"qapi/error.h\"\n+#include \"qemu/module.h\"\n+#include \"qemu/memalign.h\"\n+#include \"qemu/cutils.h\"\n+#include \"hw/scsi/scsi.h\"\n+#include \"scsi/constants.h\"\n+#include \"system/block-backend.h\"\n+#include \"hw/block/block.h\"\n+#include \"hw/core/qdev-properties.h\"\n+#include \"hw/core/qdev-properties-system.h\"\n+#include \"qom/object.h\"\n+\n+#define SCSI_MAX_INQUIRY_LEN 256\n+\n+#define TYPE_SCSI_TAPE \"scsi-tape\"\n+\n+OBJECT_DECLARE_SIMPLE_TYPE(SCSITapeState, SCSI_TAPE)\n+\n+typedef struct SCSITapeReq {\n+ SCSIRequest req;\n+\n+ uint32_t buflen;\n+ struct iovec iov;\n+\n+ QEMUIOVector qiov;\n+} SCSITapeReq;\n+\n+struct SCSITapeState {\n+ SCSIDevice qdev;\n+\n+ char *vendor;\n+ char *product;\n+ char *version;\n+ char *serial;\n+};\n+\n+static void scsi_free_request(SCSIRequest *req)\n+{\n+ SCSITapeReq *r = DO_UPCAST(SCSITapeReq, req, req);\n+\n+ qemu_vfree(r->iov.iov_base);\n+}\n+\n+static uint8_t *scsi_get_buf(SCSIRequest *req)\n+{\n+ SCSITapeReq *r = DO_UPCAST(SCSITapeReq, req, req);\n+\n+ return (uint8_t *)r->iov.iov_base;\n+}\n+\n+static void scsi_init_iovec(SCSITapeReq *r, size_t size)\n+{\n+ if (!r->iov.iov_base) {\n+ r->buflen = size;\n+ r->iov.iov_base = qemu_memalign(qemu_real_host_page_size(), size);\n+ }\n+\n+ r->iov.iov_len = size;\n+ qemu_iovec_init_external(&r->qiov, &r->iov, 1);\n+}\n+\n+static void scsi_check_condition(SCSITapeReq *r, SCSISense sense)\n+{\n+ scsi_req_build_sense(&r->req, sense);\n+ scsi_req_complete(&r->req, CHECK_CONDITION);\n+}\n+\n+static int scsi_disk_emulate_vpd_page(SCSIRequest *req, uint8_t *outbuf)\n+{\n+ SCSITapeState *s = DO_UPCAST(SCSITapeState, qdev, req->dev);\n+ uint8_t page_code = req->cmd.buf[2];\n+\n+ outbuf[0] = TYPE_TAPE;\n+ outbuf[1] = page_code;\n+ outbuf[2] = 0x00;\n+ outbuf[3] = 0x00;\n+\n+ switch (page_code) {\n+ case 0x00: /* Supported VPD pages */\n+ outbuf[4] = 0x00; /* page 0x00 (this page) */\n+ if (s->serial) {\n+ outbuf[5] = 0x80; /* page 0x80 (serial number) */\n+ outbuf[3] = 2; /* page data length */\n+ return 6;\n+ }\n+ outbuf[3] = 1;\n+ return 5;\n+\n+ case 0x80: /* Unit Serial Number */\n+ if (!s->serial) {\n+ return -1; /* not supported, caller sends INVALID_FIELD */\n+ }\n+ {\n+ int l = strlen(s->serial);\n+ if (l > 36) {\n+ l = 36;\n+ }\n+ outbuf[3] = l;\n+ memcpy(&outbuf[4], s->serial, l);\n+ return 4 + l;\n+ }\n+\n+ default:\n+ return -1; /* unsupported VPD page */\n+ }\n+}\n+\n+static int scsi_tape_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)\n+{\n+ SCSITapeState *s = DO_UPCAST(SCSITapeState, qdev, req->dev);\n+ int buflen;\n+\n+ if (req->cmd.buf[1] & 0x1) {\n+ return scsi_disk_emulate_vpd_page(req, outbuf);\n+ }\n+\n+ /* Standard INQUIRY, not a VPD request */\n+ if (req->cmd.buf[2] != 0) {\n+ return -1;\n+ }\n+\n+ /* PAGE_CODE == 0 */\n+ buflen = req->cmd.xfer;\n+ if (buflen > SCSI_MAX_INQUIRY_LEN) {\n+ buflen = SCSI_MAX_INQUIRY_LEN;\n+ }\n+\n+ outbuf[0] = TYPE_TAPE; /* 0x01 = Tape */\n+ outbuf[1] = 0x80; /* Always removable */\n+ outbuf[2] = 0x05; /* SPC-3 */\n+ outbuf[3] = 0x02 | 0x10; /* Format 2, HiSup */\n+\n+ if (buflen > 36) {\n+ outbuf[4] = buflen - 5;\n+ } else {\n+ outbuf[4] = 36 - 5;\n+ }\n+\n+ outbuf[7] = 0x10 | (req->bus->info->tcq ? 0x02 : 0);\n+\n+ strpadcpy((char *)&outbuf[16], 16, s->product, ' ');\n+ strpadcpy((char *)&outbuf[8], 8, s->vendor, ' ');\n+\n+ memset(&outbuf[32], 0, 4);\n+ memcpy(&outbuf[32], s->version, MIN(4, strlen(s->version)));\n+\n+ return buflen;\n+}\n+\n+/*\n+ * > 0 - number of bytes from device to host\n+ * < 0 - number of bytes from host to device\n+ * = 0 - no data transfer, already completed\n+ */\n+static int32_t scsi_tape_emulate_command(SCSIRequest *req, uint8_t *buf)\n+{\n+ SCSITapeReq *r = DO_UPCAST(SCSITapeReq, req, req);\n+ uint8_t *outbuf;\n+ int32_t len = 0;\n+ uint8_t command = buf[0];\n+\n+ if (req->cmd.xfer > 65536) {\n+ scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));\n+ return 0;\n+ }\n+ r->buflen = MAX(4096, req->cmd.xfer);\n+ scsi_init_iovec(r, r->buflen);\n+\n+ outbuf = r->iov.iov_base;\n+ memset(outbuf, 0, r->buflen);\n+\n+ switch (command) {\n+ case INQUIRY:\n+ len = scsi_tape_emulate_inquiry(req, outbuf);\n+ if (len < 0) {\n+ scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));\n+ return 0;\n+ }\n+ break;\n+\n+ case TEST_UNIT_READY:\n+ if (!blk_is_available(req->dev->conf.blk)) {\n+ scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));\n+ return 0;\n+ }\n+\n+ /* TODO: check if tape is really ready */\n+ scsi_req_complete(&r->req, GOOD);\n+ return 0;\n+ case REQUEST_SENSE:\n+ /* TODO: returning NO SENSE for now handle it later. */\n+ /* 0x0: 0x70 = current errors, fixed format */\n+ /* 0x2: sense key (0x00 = NO SENSE) */\n+ /* 0x7: additional sense length */\n+ {\n+ int sense_len = MIN(buf[4], 18);\n+ memset(outbuf, 0, sense_len);\n+ outbuf[0] = 0x70;\n+ outbuf[2] = 0x00;\n+ outbuf[7] = 10;\n+ len = sense_len;\n+ }\n+ break;\n+\n+ case REWIND:\n+ if (!blk_is_available(req->dev->conf.blk)) {\n+ scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));\n+ return 0;\n+ }\n+\n+ /* TODO: reset tape position to beginning of SIMH image */\n+ scsi_req_complete(&r->req, GOOD);\n+ return 0;\n+\n+ /* Add rest later */\n+ default:\n+ scsi_check_condition(r, SENSE_CODE(INVALID_OPCODE));\n+ return 0;\n+ }\n+\n+ r->iov.iov_len = len;\n+ return len;\n+}\n+\n+\n+/* TODO */\n+static void scsi_tape_emulate_read_data(SCSIRequest *req)\n+{\n+ SCSITapeReq *r = DO_UPCAST(SCSITapeReq, req, req);\n+ int buflen = r->iov.iov_len;\n+\n+ if (buflen) {\n+ r->iov.iov_len = 0;\n+ scsi_req_data(&r->req, buflen);\n+ return;\n+ }\n+\n+ scsi_req_complete(&r->req, GOOD);\n+}\n+\n+/* TODO: not implemented yet */\n+static void scsi_tape_emulate_write_data(SCSIRequest *req)\n+{\n+ scsi_req_complete(req, GOOD);\n+}\n+\n+static const SCSIReqOps scsi_tape_reqops = {\n+ .size = sizeof(SCSITapeReq),\n+ .free_req = scsi_free_request,\n+ .send_command = scsi_tape_emulate_command,\n+ .read_data = scsi_tape_emulate_read_data,\n+ .write_data = scsi_tape_emulate_write_data,\n+ .get_buf = scsi_get_buf,\n+};\n+\n+static SCSIRequest *scsi_tape_new_request(SCSIDevice *d, uint32_t tag,\n+ uint32_t lun, uint8_t *buf,\n+ void *hba_private)\n+{\n+ return scsi_req_alloc(&scsi_tape_reqops, d, tag, lun, hba_private);\n+}\n+\n+static void scsi_tape_realize(SCSIDevice *dev, Error **errp)\n+{\n+ SCSITapeState *s = DO_UPCAST(SCSITapeState, qdev, dev);\n+\n+ dev->type = TYPE_TAPE;\n+\n+ if (!s->qdev.conf.blk) {\n+ error_setg(errp, \"Drive property not set\");\n+ return;\n+ }\n+\n+ if (!blk_is_inserted(s->qdev.conf.blk)) {\n+ error_setg(errp, \"Device needs media, but drive is empty\");\n+ return;\n+ }\n+\n+ if (!s->vendor) {\n+ s->vendor = g_strdup(\"QEMU\");\n+ }\n+ if (!s->product) {\n+ s->product = g_strdup(\"QEMU TAPE\");\n+ }\n+ if (!s->version) {\n+ s->version = g_strdup(QEMU_HW_VERSION);\n+ }\n+}\n+\n+static Property scsi_tape_properties[] = {\n+ DEFINE_PROP_DRIVE(\"drive\", SCSITapeState, qdev.conf.blk),\n+ DEFINE_PROP_STRING(\"vendor\", SCSITapeState, vendor),\n+ DEFINE_PROP_STRING(\"product\", SCSITapeState, product),\n+ DEFINE_PROP_STRING(\"ver\", SCSITapeState, version),\n+ DEFINE_PROP_STRING(\"serial\", SCSITapeState, serial),\n+};\n+\n+static void scsi_tape_class_initfn(ObjectClass *klass, const void *data)\n+{\n+ DeviceClass *dc = DEVICE_CLASS(klass);\n+ SCSIDeviceClass *sc = SCSI_DEVICE_CLASS(klass);\n+\n+ sc->realize = scsi_tape_realize;\n+ sc->alloc_req = scsi_tape_new_request;\n+ dc->desc = \"SCSI Tape\";\n+ device_class_set_props(dc, scsi_tape_properties);\n+}\n+\n+static const TypeInfo scsi_tape_info = {\n+ .name = TYPE_SCSI_TAPE,\n+ .parent = TYPE_SCSI_DEVICE,\n+ .instance_size = sizeof(SCSITapeState),\n+ .class_init = scsi_tape_class_initfn,\n+};\n+\n+static void scsi_tape_register_types(void)\n+{\n+ type_register_static(&scsi_tape_info);\n+}\n+\n+type_init(scsi_tape_register_types)\n", "prefixes": [ "RFC" ] }