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Sun, 20 Oct 2024 01:30:09 +0000 (GMT) From: jrossi@linux.ibm.com To: qemu-devel@nongnu.org, qemu-s390x@nongnu.org, thuth@redhat.com Cc: frankja@linux.ibm.com, jrossi@linux.ibm.com Subject: [PATCH v5 09/19] pc-bios/s390-ccw: Remove panics from SCSI IPL path Date: Sat, 19 Oct 2024 21:29:43 -0400 Message-ID: <20241020012953.1380075-10-jrossi@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241020012953.1380075-1-jrossi@linux.ibm.com> References: <20241020012953.1380075-1-jrossi@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: wkKSww9VK06ySEIWt5x9kg8BJA_kOfkI X-Proofpoint-GUID: wkKSww9VK06ySEIWt5x9kg8BJA_kOfkI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 phishscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410200009 Received-SPF: pass client-ip=148.163.156.1; envelope-from=jrossi@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Jared Rossi Remove panic-on-error from virtio-scsi IPL specific functions so that error recovery may be possible in the future. Functions that would previously panic now provide a return code. Signed-off-by: Jared Rossi Reviewed-by: Thomas Huth --- pc-bios/s390-ccw/bootmap.c | 88 ++++++++++++++----- pc-bios/s390-ccw/virtio-blkdev.c | 4 +- pc-bios/s390-ccw/virtio-scsi.c | 143 +++++++++++++++++++++---------- 3 files changed, 164 insertions(+), 71 deletions(-) diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c index b9596e28c7..652807a16a 100644 --- a/pc-bios/s390-ccw/bootmap.c +++ b/pc-bios/s390-ccw/bootmap.c @@ -595,7 +595,7 @@ static int ipl_eckd(void) * IPL a SCSI disk */ -static void zipl_load_segment(ComponentEntry *entry) +static int zipl_load_segment(ComponentEntry *entry) { const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr)); ScsiBlockPtr *bprs = (void *)sec; @@ -615,7 +615,10 @@ static void zipl_load_segment(ComponentEntry *entry) do { memset(bprs, FREE_SPACE_FILLER, bprs_size); fill_hex_val(blk_no, &blockno, sizeof(blockno)); - read_block(blockno, bprs, err_msg); + if (virtio_read(blockno, bprs)) { + puts(err_msg); + return -EIO; + } for (i = 0;; i++) { uint64_t *cur_desc = (void *)&bprs[i]; @@ -643,23 +646,37 @@ static void zipl_load_segment(ComponentEntry *entry) } address = virtio_load_direct(cur_desc[0], cur_desc[1], 0, (void *)address); - IPL_assert(address != -1, "zIPL load segment failed"); + if (!address) { + puts("zIPL load segment failed"); + return -EIO; + } } } while (blockno); + + return 0; } /* Run a zipl program */ -static void zipl_run(ScsiBlockPtr *pte) +static int zipl_run(ScsiBlockPtr *pte) { ComponentHeader *header; ComponentEntry *entry; uint8_t tmp_sec[MAX_SECTOR_SIZE]; - read_block(pte->blockno, tmp_sec, "Cannot read header"); + if (virtio_read(pte->blockno, tmp_sec)) { + puts("Cannot read header"); + return -EIO; + } header = (ComponentHeader *)tmp_sec; - IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); - IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); + if (!magic_match(tmp_sec, ZIPL_MAGIC)) { + puts("No zIPL magic in header"); + return -EINVAL; + } + if (header->type != ZIPL_COMP_HEADER_IPL) { + puts("Bad header type"); + return -EINVAL; + } dputs("start loading images\n"); @@ -674,22 +691,30 @@ static void zipl_run(ScsiBlockPtr *pte) continue; } - zipl_load_segment(entry); + if (zipl_load_segment(entry)) { + return -1; + } entry++; - IPL_assert((uint8_t *)(&entry[1]) <= (tmp_sec + MAX_SECTOR_SIZE), - "Wrong entry value"); + if ((uint8_t *)(&entry[1]) > (tmp_sec + MAX_SECTOR_SIZE)) { + puts("Wrong entry value"); + return -EINVAL; + } } - IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry"); + if (entry->component_type != ZIPL_COMP_ENTRY_EXEC) { + puts("No EXEC entry"); + return -EINVAL; + } /* should not return */ write_reset_psw(entry->compdat.load_psw); jump_to_IPL_code(0); + return -1; } -static void ipl_scsi(void) +static int ipl_scsi(void) { ScsiMbr *mbr = (void *)sec; int program_table_entries = 0; @@ -700,10 +725,13 @@ static void ipl_scsi(void) /* Grab the MBR */ memset(sec, FREE_SPACE_FILLER, sizeof(sec)); - read_block(0, mbr, "Cannot read block 0"); + if (virtio_read(0, mbr)) { + puts("Cannot read block 0"); + return -EIO; + } if (!magic_match(mbr->magic, ZIPL_MAGIC)) { - return; + return 0; } puts("Using SCSI scheme."); @@ -711,11 +739,20 @@ static void ipl_scsi(void) IPL_check(mbr->version_id == 1, "Unknown MBR layout version, assuming version 1"); debug_print_int("program table", mbr->pt.blockno); - IPL_assert(mbr->pt.blockno, "No Program Table"); + if (!mbr->pt.blockno) { + puts("No Program Table"); + return -EINVAL; + } /* Parse the program table */ - read_block(mbr->pt.blockno, sec, "Error reading Program Table"); - IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); + if (virtio_read(mbr->pt.blockno, sec)) { + puts("Error reading Program Table"); + return -EIO; + } + if (!magic_match(sec, ZIPL_MAGIC)) { + puts("No zIPL magic in Program Table"); + return -EINVAL; + } for (i = 0; i < MAX_BOOT_ENTRIES; i++) { if (prog_table->entry[i].scsi.blockno) { @@ -725,17 +762,22 @@ static void ipl_scsi(void) } debug_print_int("program table entries", program_table_entries); - IPL_assert(program_table_entries != 0, "Empty Program Table"); + if (program_table_entries == 0) { + puts("Empty Program Table"); + return -EINVAL; + } if (menu_is_enabled_enum()) { loadparm = menu_get_enum_boot_index(valid_entries); } debug_print_int("loadparm", loadparm); - IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than" - " maximum number of boot entries allowed"); + if (loadparm >= MAX_BOOT_ENTRIES) { + puts("loadparm value greater than max number of boot entries allowed"); + return -EINVAL; + } - zipl_run(&prog_table->entry[loadparm].scsi); /* no return */ + return zipl_run(&prog_table->entry[loadparm].scsi); } /*********************************************************************** @@ -1032,7 +1074,9 @@ void zipl_load(void) netmain(); } - ipl_scsi(); + if (ipl_scsi()) { + panic("\n! Cannot IPL this SCSI device !\n"); + } switch (virtio_get_device_type()) { case VIRTIO_ID_BLOCK: diff --git a/pc-bios/s390-ccw/virtio-blkdev.c b/pc-bios/s390-ccw/virtio-blkdev.c index 2666326801..1c585f034b 100644 --- a/pc-bios/s390-ccw/virtio-blkdev.c +++ b/pc-bios/s390-ccw/virtio-blkdev.c @@ -73,13 +73,13 @@ unsigned long virtio_load_direct(unsigned long rec_list1, unsigned long rec_list unsigned long addr = (unsigned long)load_addr; if (sec_len != virtio_get_block_size()) { - return -1; + return 0; } printf("."); status = virtio_read_many(sec, (void *)addr, sec_num); if (status) { - panic("I/O Error"); + return 0; } addr += sec_num * virtio_get_block_size(); diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c index 6b4a1caf8a..71db75ce7b 100644 --- a/pc-bios/s390-ccw/virtio-scsi.c +++ b/pc-bios/s390-ccw/virtio-scsi.c @@ -26,7 +26,7 @@ static uint8_t scsi_inquiry_std_response[256]; static ScsiInquiryEvpdPages scsi_inquiry_evpd_pages_response; static ScsiInquiryEvpdBl scsi_inquiry_evpd_bl_response; -static inline void vs_assert(bool term, const char **msgs) +static inline bool vs_assert(bool term, const char **msgs) { if (!term) { int i = 0; @@ -35,11 +35,13 @@ static inline void vs_assert(bool term, const char **msgs) while (msgs[i]) { printf("%s", msgs[i++]); } - panic(" !\n"); + puts(" !"); } + + return term; } -static void virtio_scsi_verify_response(VirtioScsiCmdResp *resp, +static bool virtio_scsi_verify_response(VirtioScsiCmdResp *resp, const char *title) { const char *mr[] = { @@ -56,8 +58,8 @@ static void virtio_scsi_verify_response(VirtioScsiCmdResp *resp, 0 }; - vs_assert(resp->response == VIRTIO_SCSI_S_OK, mr); - vs_assert(resp->status == CDB_STATUS_GOOD, ms); + return vs_assert(resp->response == VIRTIO_SCSI_S_OK, mr) && + vs_assert(resp->status == CDB_STATUS_GOOD, ms); } static void prepare_request(VDev *vdev, const void *cdb, int cdb_size, @@ -78,24 +80,31 @@ static void prepare_request(VDev *vdev, const void *cdb, int cdb_size, } } -static inline void vs_io_assert(bool term, const char *msg) +static inline bool vs_io_assert(bool term, const char *msg) { - if (!term) { - virtio_scsi_verify_response(&resp, msg); + if (!term && !virtio_scsi_verify_response(&resp, msg)) { + return false; } + + return true; } -static void vs_run(const char *title, VirtioCmd *cmd, VDev *vdev, +static int vs_run(const char *title, VirtioCmd *cmd, VDev *vdev, const void *cdb, int cdb_size, void *data, uint32_t data_size) { prepare_request(vdev, cdb, cdb_size, data, data_size); - vs_io_assert(virtio_run(vdev, VR_REQUEST, cmd) == 0, title); + if (!vs_io_assert(virtio_run(vdev, VR_REQUEST, cmd) == 0, title)) { + puts(title); + return -EIO; + } + + return 0; } /* SCSI protocol implementation routines */ -static bool scsi_inquiry(VDev *vdev, uint8_t evpd, uint8_t page, +static int scsi_inquiry(VDev *vdev, uint8_t evpd, uint8_t page, void *data, uint32_t data_size) { ScsiCdbInquiry cdb = { @@ -110,12 +119,13 @@ static bool scsi_inquiry(VDev *vdev, uint8_t evpd, uint8_t page, { data, data_size, VRING_DESC_F_WRITE }, }; - vs_run("inquiry", inquiry, vdev, &cdb, sizeof(cdb), data, data_size); + int ret = vs_run("inquiry", inquiry, + vdev, &cdb, sizeof(cdb), data, data_size); - return virtio_scsi_response_ok(&resp); + return ret ? ret : virtio_scsi_response_ok(&resp); } -static bool scsi_test_unit_ready(VDev *vdev) +static int scsi_test_unit_ready(VDev *vdev) { ScsiCdbTestUnitReady cdb = { .command = 0x00, @@ -131,7 +141,7 @@ static bool scsi_test_unit_ready(VDev *vdev) return virtio_scsi_response_ok(&resp); } -static bool scsi_report_luns(VDev *vdev, void *data, uint32_t data_size) +static int scsi_report_luns(VDev *vdev, void *data, uint32_t data_size) { ScsiCdbReportLuns cdb = { .command = 0xa0, @@ -144,13 +154,13 @@ static bool scsi_report_luns(VDev *vdev, void *data, uint32_t data_size) { data, data_size, VRING_DESC_F_WRITE }, }; - vs_run("report luns", report_luns, + int ret = vs_run("report luns", report_luns, vdev, &cdb, sizeof(cdb), data, data_size); - return virtio_scsi_response_ok(&resp); + return ret ? ret : virtio_scsi_response_ok(&resp); } -static bool scsi_read_10(VDev *vdev, +static int scsi_read_10(VDev *vdev, unsigned long sector, int sectors, void *data, unsigned int data_size) { @@ -168,12 +178,13 @@ static bool scsi_read_10(VDev *vdev, debug_print_int("read_10 sector", sector); debug_print_int("read_10 sectors", sectors); - vs_run("read(10)", read_10, vdev, &cdb, sizeof(cdb), data, data_size); + int ret = vs_run("read(10)", read_10, + vdev, &cdb, sizeof(cdb), data, data_size); - return virtio_scsi_response_ok(&resp); + return ret ? ret : virtio_scsi_response_ok(&resp); } -static bool scsi_read_capacity(VDev *vdev, +static int scsi_read_capacity(VDev *vdev, void *data, uint32_t data_size) { ScsiCdbReadCapacity16 cdb = { @@ -187,10 +198,10 @@ static bool scsi_read_capacity(VDev *vdev, { data, data_size, VRING_DESC_F_WRITE }, }; - vs_run("read capacity", read_capacity_16, + int ret = vs_run("read capacity", read_capacity_16, vdev, &cdb, sizeof(cdb), data, data_size); - return virtio_scsi_response_ok(&resp); + return ret ? ret : virtio_scsi_response_ok(&resp); } /* virtio-scsi routines */ @@ -207,7 +218,7 @@ static int virtio_scsi_locate_device(VDev *vdev) static uint8_t data[16 + 8 * 63]; ScsiLunReport *r = (void *) data; ScsiDevice *sdev = vdev->scsi_device; - int i, luns; + int i, ret, luns; /* QEMU has hardcoded channel #0 in many places. * If this hardcoded value is ever changed, we'll need to add code for @@ -233,13 +244,21 @@ static int virtio_scsi_locate_device(VDev *vdev) sdev->channel = channel; sdev->target = target; sdev->lun = 0; /* LUN has to be 0 for REPORT LUNS */ - if (!scsi_report_luns(vdev, data, sizeof(data))) { + ret = scsi_report_luns(vdev, data, sizeof(data)); + if (ret < 0) { + return ret; + } + + else if (ret == 0) { if (resp.response == VIRTIO_SCSI_S_BAD_TARGET) { continue; } printf("target 0x%X\n", target); - virtio_scsi_verify_response(&resp, "SCSI cannot report LUNs"); + if (!virtio_scsi_verify_response(&resp, "SCSI cannot report LUNs")) { + return -EIO; + } } + if (r->lun_list_len == 0) { printf("no LUNs for target 0x%X\n", target); continue; @@ -283,7 +302,9 @@ int virtio_scsi_read_many(VDev *vdev, data_size = sector_count * virtio_get_block_size() * f; if (!scsi_read_10(vdev, sector * f, sector_count * f, load_addr, data_size)) { - virtio_scsi_verify_response(&resp, "virtio-scsi:read_many"); + if (!virtio_scsi_verify_response(&resp, "virtio-scsi:read_many")) { + return -1; + } } load_addr += data_size; sector += sector_count; @@ -352,11 +373,16 @@ static int virtio_scsi_setup(VDev *vdev) uint8_t code = resp.sense[0] & SCSI_SENSE_CODE_MASK; uint8_t sense_key = resp.sense[2] & SCSI_SENSE_KEY_MASK; - IPL_assert(resp.sense_len != 0, "virtio-scsi:setup: no SENSE data"); + if (resp.sense_len == 0) { + puts("virtio-scsi: setup: no SENSE data"); + return -EINVAL; + } - IPL_assert(retry_test_unit_ready && code == 0x70 && - sense_key == SCSI_SENSE_KEY_UNIT_ATTENTION, - "virtio-scsi:setup: cannot retry"); + if (!retry_test_unit_ready || code != 0x70 || + sense_key != SCSI_SENSE_KEY_UNIT_ATTENTION) { + puts("virtio-scsi:setup: cannot retry"); + return -EIO; + } /* retry on CHECK_CONDITION/UNIT_ATTENTION as it * may not designate a real error, but it may be @@ -367,16 +393,22 @@ static int virtio_scsi_setup(VDev *vdev) continue; } - virtio_scsi_verify_response(&resp, "virtio-scsi:setup"); + if (!virtio_scsi_verify_response(&resp, "virtio-scsi:setup")) { + return -1; + } } /* read and cache SCSI INQUIRY response */ - if (!scsi_inquiry(vdev, + ret = scsi_inquiry(vdev, SCSI_INQUIRY_STANDARD, SCSI_INQUIRY_STANDARD_NONE, scsi_inquiry_std_response, - sizeof(scsi_inquiry_std_response))) { - virtio_scsi_verify_response(&resp, "virtio-scsi:setup:inquiry"); + sizeof(scsi_inquiry_std_response)); + if (ret < 1) { + if (ret != 0 || !virtio_scsi_verify_response(&resp, + "virtio-scsi:setup:inquiry")) { + return -1; + } } if (virtio_scsi_inquiry_response_is_cdrom(scsi_inquiry_std_response)) { @@ -385,12 +417,16 @@ static int virtio_scsi_setup(VDev *vdev) vdev->scsi_block_size = VIRTIO_ISO_BLOCK_SIZE; } - if (!scsi_inquiry(vdev, + ret = scsi_inquiry(vdev, SCSI_INQUIRY_EVPD, SCSI_INQUIRY_EVPD_SUPPORTED_PAGES, evpd, - sizeof(*evpd))) { - virtio_scsi_verify_response(&resp, "virtio-scsi:setup:supported_pages"); + sizeof(*evpd)); + if (ret < 1) { + if (ret != 0 || !virtio_scsi_verify_response(&resp, + "virtio-scsi:setup:supported_pages")) { + return -1; + } } debug_print_int("EVPD length", evpd->page_length); @@ -402,12 +438,16 @@ static int virtio_scsi_setup(VDev *vdev) continue; } - if (!scsi_inquiry(vdev, + ret = scsi_inquiry(vdev, SCSI_INQUIRY_EVPD, SCSI_INQUIRY_EVPD_BLOCK_LIMITS, evpd_bl, - sizeof(*evpd_bl))) { - virtio_scsi_verify_response(&resp, "virtio-scsi:setup:blocklimits"); + sizeof(*evpd_bl)); + if (ret < 1) { + if (ret != 0 || !virtio_scsi_verify_response(&resp, + "virtio-scsi:setup:blocklimits")) { + return -1; + } } debug_print_int("max transfer", evpd_bl->max_transfer); @@ -423,8 +463,12 @@ static int virtio_scsi_setup(VDev *vdev) vdev->max_transfer = MIN_NON_ZERO(VIRTIO_SCSI_MAX_SECTORS, vdev->max_transfer); - if (!scsi_read_capacity(vdev, data, data_size)) { - virtio_scsi_verify_response(&resp, "virtio-scsi:setup:read_capacity"); + ret = scsi_read_capacity(vdev, data, data_size); + if (ret < 1) { + if (ret != 0 || !virtio_scsi_verify_response(&resp, + "virtio-scsi:setup:read_capacity")) { + return -1; + } } scsi_parse_capacity_report(data, &vdev->scsi_last_block, (uint32_t *) &vdev->scsi_block_size); @@ -439,10 +483,15 @@ int virtio_scsi_setup_device(SubChannelId schid) vdev->schid = schid; virtio_setup_ccw(vdev); - IPL_assert(vdev->config.scsi.sense_size == VIRTIO_SCSI_SENSE_SIZE, - "Config: sense size mismatch"); - IPL_assert(vdev->config.scsi.cdb_size == VIRTIO_SCSI_CDB_SIZE, - "Config: CDB size mismatch"); + if (vdev->config.scsi.sense_size != VIRTIO_SCSI_SENSE_SIZE) { + puts("Config: sense size mismatch"); + return -EINVAL; + } + + if (vdev->config.scsi.cdb_size != VIRTIO_SCSI_CDB_SIZE) { + puts("Config: CDB size mismatch"); + return -EINVAL; + } puts("Using virtio-scsi.");