From 41a56360a0f4124252180132e28c166792ee8853 Mon Sep 17 00:00:00 2001 From: Jared Rossi Date: Sat, 19 Oct 2024 21:29:46 -0400 Subject: [PATCH 13/27] pc-bios/s390-ccw: Enable failed IPL to return after error MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Thomas Huth RH-MergeRequest: 277: Full boot order support for s390x [CentOS 9] RH-Jira: RHEL-11424 RH-Acked-by: Cédric Le Goater RH-Acked-by: Miroslav Rezanina RH-Commit: [13/23] c86e8a72a631081348e88ac1df99c2eec8ca27dd (thuth/qemu-kvm-cs9) Remove panic-on-error from IPL functions such that a return code is propagated back to the main IPL calling function (rather than terminating immediately), which facilitates possible error recovery in the future. A select few panics remain, which indicate fatal non-devices errors that must result in termination. Signed-off-by: Jared Rossi Reviewed-by: Thomas Huth Message-ID: <20241020012953.1380075-13-jrossi@linux.ibm.com> Signed-off-by: Thomas Huth (cherry picked from commit 0181e23713114fd4c33326c3372aaf48dcfb412a) --- pc-bios/s390-ccw/bootmap.c | 53 ++++++++++++++++++-------- pc-bios/s390-ccw/cio.c | 3 +- pc-bios/s390-ccw/jump2ipl.c | 5 ++- pc-bios/s390-ccw/main.c | 32 +++++++++------- pc-bios/s390-ccw/s390-ccw.h | 2 +- pc-bios/s390-ccw/virtio-blkdev.c | 2 +- pc-bios/s390-ccw/virtio.c | 65 +++++++++++++++++++++----------- pc-bios/s390-ccw/virtio.h | 2 +- 8 files changed, 108 insertions(+), 56 deletions(-) diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c index 95ef9104d0..56f2f75640 100644 --- a/pc-bios/s390-ccw/bootmap.c +++ b/pc-bios/s390-ccw/bootmap.c @@ -62,15 +62,34 @@ static void *s2_prev_blk = _s2; static void *s2_cur_blk = _s2 + MAX_SECTOR_SIZE; static void *s2_next_blk = _s2 + MAX_SECTOR_SIZE * 2; -static inline void verify_boot_info(BootInfo *bip) +static inline int verify_boot_info(BootInfo *bip) { - IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo"); - IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version"); - IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL"); - IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD"); - IPL_assert(bip->flags == BOOT_INFO_FLAGS_ARCH, "Not for this arch"); - IPL_assert(block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size), - "Bad block size in zIPL section of the 1st record."); + if (!magic_match(bip->magic, ZIPL_MAGIC)) { + puts("No zIPL sig in BootInfo"); + return -EINVAL; + } + if (bip->version != BOOT_INFO_VERSION) { + puts("Wrong zIPL version"); + return -EINVAL; + } + if (bip->bp_type != BOOT_INFO_BP_TYPE_IPL) { + puts("DASD is not for IPL"); + return -ENODEV; + } + if (bip->dev_type != BOOT_INFO_DEV_TYPE_ECKD) { + puts("DASD is not ECKD"); + return -ENODEV; + } + if (bip->flags != BOOT_INFO_FLAGS_ARCH) { + puts("Not for this arch"); + return -EINVAL; + } + if (!block_size_ok(bip->bp.ipl.bm_ptr.eckd.bptr.size)) { + puts("Bad block size in zIPL section of 1st record"); + return -EINVAL; + } + + return 0; } static void eckd_format_chs(ExtEckdBlockPtr *ptr, bool ldipl, @@ -367,8 +386,8 @@ static int run_eckd_boot_script(block_number_t bmt_block_nr, puts("Unknown script entry type"); return -EINVAL; } - write_reset_psw(bms->entry[i].address.load_address); /* no return */ - jump_to_IPL_code(0); /* no return */ + write_reset_psw(bms->entry[i].address.load_address); + jump_to_IPL_code(0); return -1; } @@ -1067,16 +1086,19 @@ void zipl_load(void) if (vdev->is_cdrom) { ipl_iso_el_torito(); - panic("\n! Cannot IPL this ISO image !\n"); + puts("Failed to IPL this ISO image!"); + return; } if (virtio_get_device_type() == VIRTIO_ID_NET) { netmain(); - panic("\n! Cannot IPL from this network !\n"); + puts("Failed to IPL from this network!"); + return; } if (ipl_scsi()) { - panic("\n! Cannot IPL this SCSI device !\n"); + puts("Failed to IPL from this SCSI device!"); + return; } switch (virtio_get_device_type()) { @@ -1087,8 +1109,9 @@ void zipl_load(void) zipl_load_vscsi(); break; default: - panic("\n! Unknown IPL device type !\n"); + puts("Unknown IPL device type!"); + return; } - puts("zIPL load failed."); + puts("zIPL load failed!"); } diff --git a/pc-bios/s390-ccw/cio.c b/pc-bios/s390-ccw/cio.c index 7b09a38c96..5d543da73f 100644 --- a/pc-bios/s390-ccw/cio.c +++ b/pc-bios/s390-ccw/cio.c @@ -59,7 +59,8 @@ uint16_t cu_type(SubChannelId schid) }; if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) { - panic("Failed to run SenseID CCw\n"); + puts("Failed to run SenseID CCW"); + return CU_TYPE_UNKNOWN; } return sense_data.cu_type; diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c index 80b7f6a1f3..8db1764ff3 100644 --- a/pc-bios/s390-ccw/jump2ipl.c +++ b/pc-bios/s390-ccw/jump2ipl.c @@ -33,7 +33,7 @@ static void jump_to_IPL_addr(void) /* should not return */ } -void jump_to_IPL_code(uint64_t address) +int jump_to_IPL_code(uint64_t address) { /* store the subsystem information _after_ the bootmap was loaded */ write_subsystem_identification(); @@ -68,7 +68,8 @@ void jump_to_IPL_code(uint64_t address) asm volatile("lghi %%r1,1\n\t" "diag %%r1,%%r1,0x308\n\t" : : : "1", "memory"); - panic("\n! IPL returns !\n"); + puts("IPL code jump failed"); + return -1; } void jump_to_low_kernel(void) diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c index fc44da3161..34ef27d7a6 100644 --- a/pc-bios/s390-ccw/main.c +++ b/pc-bios/s390-ccw/main.c @@ -77,6 +77,9 @@ static int is_dev_possibly_bootable(int dev_no, int sch_no) enable_subchannel(blk_schid); cutype = cu_type(blk_schid); + if (cutype == CU_TYPE_UNKNOWN) { + return -EIO; + } /* * Note: we always have to run virtio_is_supported() here to make @@ -194,10 +197,10 @@ static void boot_setup(void) have_iplb = store_iplb(&iplb); } -static void find_boot_device(void) +static bool find_boot_device(void) { VDev *vdev = virtio_get_device(); - bool found; + bool found = false; switch (iplb.pbt) { case S390_IPL_TYPE_CCW: @@ -215,10 +218,10 @@ static void find_boot_device(void) found = find_subch(iplb.scsi.devno); break; default: - panic("List-directed IPL not supported yet!\n"); + puts("Unsupported IPLB"); } - IPL_assert(found, "Boot device not found\n"); + return found; } static int virtio_setup(void) @@ -244,11 +247,13 @@ static int virtio_setup(void) ret = virtio_scsi_setup_device(blk_schid); break; default: - panic("\n! No IPL device available !\n"); + puts("\n! No IPL device available !\n"); + return -1; } - if (!ret) { - IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); + if (!ret && !virtio_ipl_disk_is_valid()) { + puts("No valid IPL device detected"); + return -ENODEV; } return ret; @@ -259,16 +264,16 @@ static void ipl_boot_device(void) switch (cutype) { case CU_TYPE_DASD_3990: case CU_TYPE_DASD_2107: - dasd_ipl(blk_schid, cutype); /* no return */ + dasd_ipl(blk_schid, cutype); break; case CU_TYPE_VIRTIO: - if (virtio_setup() == 0) { - zipl_load(); /* Only returns in case of errors */ + if (virtio_setup()) { + return; /* Only returns in case of errors */ } + zipl_load(); break; default: printf("Attempting to boot from unexpected device type 0x%X\n", cutype); - panic("\nBoot failed.\n"); } } @@ -301,12 +306,11 @@ void main(void) sclp_setup(); css_setup(); boot_setup(); - if (have_iplb) { - find_boot_device(); + if (have_iplb && find_boot_device()) { ipl_boot_device(); } else { probe_boot_device(); } - panic("Failed to load OS from hard disk\n"); + panic("Failed to IPL. Halting..."); } diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h index 344ad15655..6cdce3e5e5 100644 --- a/pc-bios/s390-ccw/s390-ccw.h +++ b/pc-bios/s390-ccw/s390-ccw.h @@ -78,7 +78,7 @@ void zipl_load(void); /* jump2ipl.c */ void write_reset_psw(uint64_t psw); -void jump_to_IPL_code(uint64_t address); +int jump_to_IPL_code(uint64_t address); void jump_to_low_kernel(void); /* menu.c */ diff --git a/pc-bios/s390-ccw/virtio-blkdev.c b/pc-bios/s390-ccw/virtio-blkdev.c index 1c585f034b..7b2d1e20f4 100644 --- a/pc-bios/s390-ccw/virtio-blkdev.c +++ b/pc-bios/s390-ccw/virtio-blkdev.c @@ -59,7 +59,7 @@ int virtio_read_many(unsigned long sector, void *load_addr, int sec_num) case VIRTIO_ID_SCSI: return virtio_scsi_read_many(vdev, sector, load_addr, sec_num); } - panic("\n! No readable IPL device !\n"); + return -1; } diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 8c6b0a8a92..8b5a370bb3 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -217,16 +217,19 @@ int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd) return 0; } -void virtio_setup_ccw(VDev *vdev) +int virtio_setup_ccw(VDev *vdev) { - int i, rc, cfg_size = 0; + int i, cfg_size = 0; uint8_t status; struct VirtioFeatureDesc { uint32_t features; uint8_t index; } __attribute__((packed)) feats; - IPL_assert(virtio_is_supported(vdev->schid), "PE"); + if (!virtio_is_supported(vdev->schid)) { + puts("Virtio unsupported for this device ID"); + return -ENODEV; + } /* device ID has been established now */ vdev->config.blk.blk_size = 0; /* mark "illegal" - setup started... */ @@ -235,8 +238,10 @@ void virtio_setup_ccw(VDev *vdev) run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false); status = VIRTIO_CONFIG_S_ACKNOWLEDGE; - rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false); - IPL_assert(rc == 0, "Could not write ACKNOWLEDGE status to host"); + if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false)) { + puts("Could not write ACKNOWLEDGE status to host"); + return -EIO; + } switch (vdev->senseid.cu_model) { case VIRTIO_ID_NET: @@ -255,27 +260,37 @@ void virtio_setup_ccw(VDev *vdev) cfg_size = sizeof(vdev->config.scsi); break; default: - panic("Unsupported virtio device\n"); + puts("Unsupported virtio device"); + return -ENODEV; } status |= VIRTIO_CONFIG_S_DRIVER; - rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false); - IPL_assert(rc == 0, "Could not write DRIVER status to host"); + if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false)) { + puts("Could not write DRIVER status to host"); + return -EIO; + } /* Feature negotiation */ for (i = 0; i < ARRAY_SIZE(vdev->guest_features); i++) { feats.features = 0; feats.index = i; - rc = run_ccw(vdev, CCW_CMD_READ_FEAT, &feats, sizeof(feats), false); - IPL_assert(rc == 0, "Could not get features bits"); + if (run_ccw(vdev, CCW_CMD_READ_FEAT, &feats, sizeof(feats), false)) { + puts("Could not get features bits"); + return -EIO; + } + vdev->guest_features[i] &= bswap32(feats.features); feats.features = bswap32(vdev->guest_features[i]); - rc = run_ccw(vdev, CCW_CMD_WRITE_FEAT, &feats, sizeof(feats), false); - IPL_assert(rc == 0, "Could not set features bits"); + if (run_ccw(vdev, CCW_CMD_WRITE_FEAT, &feats, sizeof(feats), false)) { + puts("Could not set features bits"); + return -EIO; + } } - rc = run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false); - IPL_assert(rc == 0, "Could not get virtio device configuration"); + if (run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false)) { + puts("Could not get virtio device configuration"); + return -EIO; + } for (i = 0; i < vdev->nr_vqs; i++) { VqInfo info = { @@ -289,19 +304,27 @@ void virtio_setup_ccw(VDev *vdev) .num = 0, }; - rc = run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config), false); - IPL_assert(rc == 0, "Could not get virtio device VQ configuration"); + if (run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config), + false)) { + puts("Could not get virtio device VQ config"); + return -EIO; + } info.num = config.num; vring_init(&vdev->vrings[i], &info); vdev->vrings[i].schid = vdev->schid; - IPL_assert( - run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info), false) == 0, - "Cannot set VQ info"); + if (run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info), false)) { + puts("Cannot set VQ info"); + return -EIO; + } } status |= VIRTIO_CONFIG_S_DRIVER_OK; - rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false); - IPL_assert(rc == 0, "Could not write DRIVER_OK status to host"); + if (run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false)) { + puts("Could not write DRIVER_OK status to host"); + return -EIO; + } + + return 0; } bool virtio_is_supported(SubChannelId schid) diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h index 6f9a558ff5..9faf3986b1 100644 --- a/pc-bios/s390-ccw/virtio.h +++ b/pc-bios/s390-ccw/virtio.h @@ -274,7 +274,7 @@ void vring_send_buf(VRing *vr, void *p, int len, int flags); int vr_poll(VRing *vr); int vring_wait_reply(void); int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd); -void virtio_setup_ccw(VDev *vdev); +int virtio_setup_ccw(VDev *vdev); int virtio_net_init(void *mac_addr); -- 2.39.3