diff options
43 files changed, 2852 insertions, 354 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index aaa649a50d..1cbd6b72fa 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3580,6 +3580,8 @@ M: Coiby Xu <Coiby.Xu@gmail.com> S: Maintained F: block/export/vhost-user-blk-server.c F: block/export/vhost-user-blk-server.h +F: block/export/virtio-blk-handler.c +F: block/export/virtio-blk-handler.h F: include/qemu/vhost-user-server.h F: tests/qtest/libqos/vhost-user-blk.c F: tests/qtest/libqos/vhost-user-blk.h @@ -3592,6 +3594,13 @@ L: qemu-block@nongnu.org S: Supported F: block/export/fuse.c +VDUSE library and block device exports +M: Xie Yongji <xieyongji@bytedance.com> +S: Maintained +F: subprojects/libvduse/ +F: block/export/vduse-blk.c +F: block/export/vduse-blk.h + Replication M: Wen Congyang <wencongyang2@huawei.com> M: Xie Changlong <xiechanglong.d@gmail.com> diff --git a/block/backup.c b/block/backup.c index 5cfd0b999c..b2b649e305 100644 --- a/block/backup.c +++ b/block/backup.c @@ -228,15 +228,13 @@ out: static void backup_init_bcs_bitmap(BackupBlockJob *job) { - bool ret; uint64_t estimate; BdrvDirtyBitmap *bcs_bitmap = block_copy_dirty_bitmap(job->bcs); if (job->sync_mode == MIRROR_SYNC_MODE_BITMAP) { bdrv_clear_dirty_bitmap(bcs_bitmap, NULL); - ret = bdrv_dirty_bitmap_merge_internal(bcs_bitmap, job->sync_bitmap, - NULL, true); - assert(ret); + bdrv_dirty_bitmap_merge_internal(bcs_bitmap, job->sync_bitmap, NULL, + true); } else if (job->sync_mode == MIRROR_SYNC_MODE_TOP) { /* * We can't hog the coroutine to initialize this thoroughly. diff --git a/block/block-backend.c b/block/block-backend.c index e0e1aff4b1..f425b00793 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -56,9 +56,6 @@ struct BlockBackend { const BlockDevOps *dev_ops; void *dev_opaque; - /* the block size for which the guest device expects atomicity */ - int guest_block_size; - /* If the BDS tree is removed, some of its options are stored here (which * can be used to restore those options in the new BDS on insert) */ BlockBackendRootState root_state; @@ -998,7 +995,6 @@ void blk_detach_dev(BlockBackend *blk, DeviceState *dev) blk->dev = NULL; blk->dev_ops = NULL; blk->dev_opaque = NULL; - blk->guest_block_size = 512; blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort); blk_unref(blk); } @@ -1062,7 +1058,7 @@ void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, blk->dev_opaque = opaque; /* Are we currently quiesced? Should we enforce this right now? */ - if (blk->quiesce_counter && ops->drained_begin) { + if (blk->quiesce_counter && ops && ops->drained_begin) { ops->drained_begin(opaque); } } @@ -2100,12 +2096,6 @@ int blk_get_max_iov(BlockBackend *blk) return blk->root->bs->bl.max_iov; } -void blk_set_guest_block_size(BlockBackend *blk, int align) -{ - IO_CODE(); - blk->guest_block_size = align; -} - void *blk_try_blockalign(BlockBackend *blk, size_t size) { IO_CODE(); diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index da1b91166f..bf3dc0512a 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -309,10 +309,7 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BdrvDirtyBitmap *parent, return NULL; } - if (!hbitmap_merge(parent->bitmap, successor->bitmap, parent->bitmap)) { - error_setg(errp, "Merging of parent and successor bitmap failed"); - return NULL; - } + hbitmap_merge(parent->bitmap, successor->bitmap, parent->bitmap); parent->disabled = successor->disabled; parent->busy = false; @@ -912,13 +909,15 @@ bool bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src, goto out; } - if (!hbitmap_can_merge(dest->bitmap, src->bitmap)) { - error_setg(errp, "Bitmaps are incompatible and can't be merged"); + if (bdrv_dirty_bitmap_size(src) != bdrv_dirty_bitmap_size(dest)) { + error_setg(errp, "Bitmaps are of different sizes (destination size is %" + PRId64 ", source size is %" PRId64 ") and can't be merged", + bdrv_dirty_bitmap_size(dest), bdrv_dirty_bitmap_size(src)); goto out; } - ret = bdrv_dirty_bitmap_merge_internal(dest, src, backup, false); - assert(ret); + bdrv_dirty_bitmap_merge_internal(dest, src, backup, false); + ret = true; out: bdrv_dirty_bitmaps_unlock(dest->bs); @@ -932,17 +931,16 @@ out: /** * bdrv_dirty_bitmap_merge_internal: merge src into dest. * Does NOT check bitmap permissions; not suitable for use as public API. + * @dest, @src and @backup (if not NULL) must have same size. * * @backup: If provided, make a copy of dest here prior to merge. * @lock: If true, lock and unlock bitmaps on the way in/out. - * returns true if the merge succeeded; false if unattempted. */ -bool bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest, +void bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src, HBitmap **backup, bool lock) { - bool ret; IO_CODE(); assert(!bdrv_dirty_bitmap_readonly(dest)); @@ -959,9 +957,9 @@ bool bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest, if (backup) { *backup = dest->bitmap; dest->bitmap = hbitmap_alloc(dest->size, hbitmap_granularity(*backup)); - ret = hbitmap_merge(*backup, src->bitmap, dest->bitmap); + hbitmap_merge(*backup, src->bitmap, dest->bitmap); } else { - ret = hbitmap_merge(dest->bitmap, src->bitmap, dest->bitmap); + hbitmap_merge(dest->bitmap, src->bitmap, dest->bitmap); } if (lock) { @@ -970,6 +968,4 @@ bool bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest, bdrv_dirty_bitmaps_unlock(src->bs); } } - - return ret; } diff --git a/block/export/export.c b/block/export/export.c index 7253af3bc3..4744862915 100644 --- a/block/export/export.c +++ b/block/export/export.c @@ -26,6 +26,9 @@ #ifdef CONFIG_VHOST_USER_BLK_SERVER #include "vhost-user-blk-server.h" #endif +#ifdef CONFIG_VDUSE_BLK_EXPORT +#include "vduse-blk.h" +#endif static const BlockExportDriver *blk_exp_drivers[] = { &blk_exp_nbd, @@ -35,6 +38,9 @@ static const BlockExportDriver *blk_exp_drivers[] = { #ifdef CONFIG_FUSE &blk_exp_fuse, #endif +#ifdef CONFIG_VDUSE_BLK_EXPORT + &blk_exp_vduse_blk, +#endif }; /* Only accessed from the main thread */ diff --git a/block/export/meson.build b/block/export/meson.build index 0a08e384c7..c60116f455 100644 --- a/block/export/meson.build +++ b/block/export/meson.build @@ -1,7 +1,12 @@ blockdev_ss.add(files('export.c')) if have_vhost_user_blk_server - blockdev_ss.add(files('vhost-user-blk-server.c')) + blockdev_ss.add(files('vhost-user-blk-server.c', 'virtio-blk-handler.c')) endif blockdev_ss.add(when: fuse, if_true: files('fuse.c')) + +if have_vduse_blk_export + blockdev_ss.add(files('vduse-blk.c', 'virtio-blk-handler.c')) + blockdev_ss.add(libvduse) +endif diff --git a/block/export/vduse-blk.c b/block/export/vduse-blk.c new file mode 100644 index 0000000000..f101c24c3f --- /dev/null +++ b/block/export/vduse-blk.c @@ -0,0 +1,374 @@ +/* + * Export QEMU block device via VDUSE + * + * Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: + * Xie Yongji <xieyongji@bytedance.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 <sys/eventfd.h> + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "block/export.h" +#include "qemu/error-report.h" +#include "util/block-helpers.h" +#include "subprojects/libvduse/libvduse.h" +#include "virtio-blk-handler.h" + +#include "standard-headers/linux/virtio_blk.h" + +#define VDUSE_DEFAULT_NUM_QUEUE 1 +#define VDUSE_DEFAULT_QUEUE_SIZE 256 + +typedef struct VduseBlkExport { + BlockExport export; + VirtioBlkHandler handler; + VduseDev *dev; + uint16_t num_queues; + char *recon_file; + unsigned int inflight; +} VduseBlkExport; + +typedef struct VduseBlkReq { + VduseVirtqElement elem; + VduseVirtq *vq; +} VduseBlkReq; + +static void vduse_blk_inflight_inc(VduseBlkExport *vblk_exp) +{ + vblk_exp->inflight++; +} + +static void vduse_blk_inflight_dec(VduseBlkExport *vblk_exp) +{ + if (--vblk_exp->inflight == 0) { + aio_wait_kick(); + } +} + +static void vduse_blk_req_complete(VduseBlkReq *req, size_t in_len) +{ + vduse_queue_push(req->vq, &req->elem, in_len); + vduse_queue_notify(req->vq); + + free(req); +} + +static void coroutine_fn vduse_blk_virtio_process_req(void *opaque) +{ + VduseBlkReq *req = opaque; + VduseVirtq *vq = req->vq; + VduseDev *dev = vduse_queue_get_dev(vq); + VduseBlkExport *vblk_exp = vduse_dev_get_priv(dev); + VirtioBlkHandler *handler = &vblk_exp->handler; + VduseVirtqElement *elem = &req->elem; + struct iovec *in_iov = elem->in_sg; + struct iovec *out_iov = elem->out_sg; + unsigned in_num = elem->in_num; + unsigned out_num = elem->out_num; + int in_len; + + in_len = virtio_blk_process_req(handler, in_iov, + out_iov, in_num, out_num); + if (in_len < 0) { + free(req); + return; + } + + vduse_blk_req_complete(req, in_len); + vduse_blk_inflight_dec(vblk_exp); +} + +static void vduse_blk_vq_handler(VduseDev *dev, VduseVirtq *vq) +{ + VduseBlkExport *vblk_exp = vduse_dev_get_priv(dev); + + while (1) { + VduseBlkReq *req; + + req = vduse_queue_pop(vq, sizeof(VduseBlkReq)); + if (!req) { + break; + } + req->vq = vq; + + Coroutine *co = + qemu_coroutine_create(vduse_blk_virtio_process_req, req); + + vduse_blk_inflight_inc(vblk_exp); + qemu_coroutine_enter(co); + } +} + +static void on_vduse_vq_kick(void *opaque) +{ + VduseVirtq *vq = opaque; + VduseDev *dev = vduse_queue_get_dev(vq); + int fd = vduse_queue_get_fd(vq); + eventfd_t kick_data; + + if (eventfd_read(fd, &kick_data) == -1) { + error_report("failed to read data from eventfd"); + return; + } + + vduse_blk_vq_handler(dev, vq); +} + +static void vduse_blk_enable_queue(VduseDev *dev, VduseVirtq *vq) +{ + VduseBlkExport *vblk_exp = vduse_dev_get_priv(dev); + + aio_set_fd_handler(vblk_exp->export.ctx, vduse_queue_get_fd(vq), + true, on_vduse_vq_kick, NULL, NULL, NULL, vq); + /* Make sure we don't miss any kick afer reconnecting */ + eventfd_write(vduse_queue_get_fd(vq), 1); +} + +static void vduse_blk_disable_queue(VduseDev *dev, VduseVirtq *vq) +{ + VduseBlkExport *vblk_exp = vduse_dev_get_priv(dev); + + aio_set_fd_handler(vblk_exp->export.ctx, vduse_queue_get_fd(vq), + true, NULL, NULL, NULL, NULL, NULL); +} + +static const VduseOps vduse_blk_ops = { + .enable_queue = vduse_blk_enable_queue, + .disable_queue = vduse_blk_disable_queue, +}; + +static void on_vduse_dev_kick(void *opaque) +{ + VduseDev *dev = opaque; + + vduse_dev_handler(dev); +} + +static void vduse_blk_attach_ctx(VduseBlkExport *vblk_exp, AioContext *ctx) +{ + int i; + + aio_set_fd_handler(vblk_exp->export.ctx, vduse_dev_get_fd(vblk_exp->dev), + true, on_vduse_dev_kick, NULL, NULL, NULL, + vblk_exp->dev); + + for (i = 0; i < vblk_exp->num_queues; i++) { + VduseVirtq *vq = vduse_dev_get_queue(vblk_exp->dev, i); + int fd = vduse_queue_get_fd(vq); + + if (fd < 0) { + continue; + } + aio_set_fd_handler(vblk_exp->export.ctx, fd, true, + on_vduse_vq_kick, NULL, NULL, NULL, vq); + } +} + +static void vduse_blk_detach_ctx(VduseBlkExport *vblk_exp) +{ + int i; + + for (i = 0; i < vblk_exp->num_queues; i++) { + VduseVirtq *vq = vduse_dev_get_queue(vblk_exp->dev, i); + int fd = vduse_queue_get_fd(vq); + + if (fd < 0) { + continue; + } + aio_set_fd_handler(vblk_exp->export.ctx, fd, + true, NULL, NULL, NULL, NULL, NULL); + } + aio_set_fd_handler(vblk_exp->export.ctx, vduse_dev_get_fd(vblk_exp->dev), + true, NULL, NULL, NULL, NULL, NULL); + + AIO_WAIT_WHILE(vblk_exp->export.ctx, vblk_exp->inflight > 0); +} + + +static void blk_aio_attached(AioContext *ctx, void *opaque) +{ + VduseBlkExport *vblk_exp = opaque; + + vblk_exp->export.ctx = ctx; + vduse_blk_attach_ctx(vblk_exp, ctx); +} + +static void blk_aio_detach(void *opaque) +{ + VduseBlkExport *vblk_exp = opaque; + + vduse_blk_detach_ctx(vblk_exp); + vblk_exp->export.ctx = NULL; +} + +static void vduse_blk_resize(void *opaque) +{ + BlockExport *exp = opaque; + VduseBlkExport *vblk_exp = container_of(exp, VduseBlkExport, export); + struct virtio_blk_config config; + + config.capacity = + cpu_to_le64(blk_getlength(exp->blk) >> VIRTIO_BLK_SECTOR_BITS); + vduse_dev_update_config(vblk_exp->dev, sizeof(config.capacity), + offsetof(struct virtio_blk_config, capacity), + (char *)&config.capacity); +} + +static const BlockDevOps vduse_block_ops = { + .resize_cb = vduse_blk_resize, +}; + +static int vduse_blk_exp_create(BlockExport *exp, BlockExportOptions *opts, + Error **errp) +{ + VduseBlkExport *vblk_exp = container_of(exp, VduseBlkExport, export); + BlockExportOptionsVduseBlk *vblk_opts = &opts->u.vduse_blk; + uint64_t logical_block_size = VIRTIO_BLK_SECTOR_SIZE; + uint16_t num_queues = VDUSE_DEFAULT_NUM_QUEUE; + uint16_t queue_size = VDUSE_DEFAULT_QUEUE_SIZE; + Error *local_err = NULL; + struct virtio_blk_config config = { 0 }; + uint64_t features; + int i, ret; + + if (vblk_opts->has_num_queues) { + num_queues = vblk_opts->num_queues; + if (num_queues == 0) { + error_setg(errp, "num-queues must be greater than 0"); + return -EINVAL; + } + } + + if (vblk_opts->has_queue_size) { + queue_size = vblk_opts->queue_size; + if (queue_size <= 2 || !is_power_of_2(queue_size) || + queue_size > VIRTQUEUE_MAX_SIZE) { + error_setg(errp, "queue-size is invalid"); + return -EINVAL; + } + } + + if (vblk_opts->has_logical_block_size) { + logical_block_size = vblk_opts->logical_block_size; + check_block_size(exp->id, "logical-block-size", logical_block_size, + &local_err); + if (local_err) { + error_propagate(errp, local_err); + return -EINVAL; + } + } + vblk_exp->num_queues = num_queues; + vblk_exp->handler.blk = exp->blk; + vblk_exp->handler.serial = g_strdup(vblk_opts->has_serial ? + vblk_opts->serial : ""); + vblk_exp->handler.logical_block_size = logical_block_size; + vblk_exp->handler.writable = opts->writable; + + config.capacity = + cpu_to_le64(blk_getlength(exp->blk) >> VIRTIO_BLK_SECTOR_BITS); + config.seg_max = cpu_to_le32(queue_size - 2); + config.min_io_size = cpu_to_le16(1); + config.opt_io_size = cpu_to_le32(1); + config.num_queues = cpu_to_le16(num_queues); + config.blk_size = cpu_to_le32(logical_block_size); + config.max_discard_sectors = cpu_to_le32(VIRTIO_BLK_MAX_DISCARD_SECTORS); + config.max_discard_seg = cpu_to_le32(1); + config.discard_sector_alignment = + cpu_to_le32(logical_block_size >> VIRTIO_BLK_SECTOR_BITS); + config.max_write_zeroes_sectors = + cpu_to_le32(VIRTIO_BLK_MAX_WRITE_ZEROES_SECTORS); + config.max_write_zeroes_seg = cpu_to_le32(1); + + features = vduse_get_virtio_features() | + (1ULL << VIRTIO_BLK_F_SEG_MAX) | + (1ULL << VIRTIO_BLK_F_TOPOLOGY) | + (1ULL << VIRTIO_BLK_F_BLK_SIZE) | + (1ULL << VIRTIO_BLK_F_FLUSH) | + (1ULL << VIRTIO_BLK_F_DISCARD) | + (1ULL << VIRTIO_BLK_F_WRITE_ZEROES); + + if (num_queues > 1) { + features |= 1ULL << VIRTIO_BLK_F_MQ; + } + if (!opts->writable) { + features |= 1ULL << VIRTIO_BLK_F_RO; + } + + vblk_exp->dev = vduse_dev_create(vblk_opts->name, VIRTIO_ID_BLOCK, 0, + features, num_queues, + sizeof(struct virtio_blk_config), + (char *)&config, &vduse_blk_ops, + vblk_exp); + if (!vblk_exp->dev) { + error_setg(errp, "failed to create vduse device"); + ret = -ENOMEM; + goto err_dev; + } + + vblk_exp->recon_file = g_strdup_printf("%s/vduse-blk-%s", + g_get_tmp_dir(), vblk_opts->name); + if (vduse_set_reconnect_log_file(vblk_exp->dev, vblk_exp->recon_file)) { + error_setg(errp, "failed to set reconnect log file"); + ret = -EINVAL; + goto err; + } + + for (i = 0; i < num_queues; i++) { + vduse_dev_setup_queue(vblk_exp->dev, i, queue_size); + } + + aio_set_fd_handler(exp->ctx, vduse_dev_get_fd(vblk_exp->dev), true, + on_vduse_dev_kick, NULL, NULL, NULL, vblk_exp->dev); + + blk_add_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach, + vblk_exp); + + blk_set_dev_ops(exp->blk, &vduse_block_ops, exp); + + return 0; +err: + vduse_dev_destroy(vblk_exp->dev); + g_free(vblk_exp->recon_file); +err_dev: + g_free(vblk_exp->handler.serial); + return ret; +} + +static void vduse_blk_exp_delete(BlockExport *exp) +{ + VduseBlkExport *vblk_exp = container_of(exp, VduseBlkExport, export); + int ret; + + blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach, + vblk_exp); + blk_set_dev_ops(exp->blk, NULL, NULL); + ret = vduse_dev_destroy(vblk_exp->dev); + if (ret != -EBUSY) { + unlink(vblk_exp->recon_file); + } + g_free(vblk_exp->recon_file); + g_free(vblk_exp->handler.serial); +} + +static void vduse_blk_exp_request_shutdown(BlockExport *exp) +{ + VduseBlkExport *vblk_exp = container_of(exp, VduseBlkExport, export); + + aio_context_acquire(vblk_exp->export.ctx); + vduse_blk_detach_ctx(vblk_exp); + aio_context_acquire(vblk_exp->export.ctx); +} + +const BlockExportDriver blk_exp_vduse_blk = { + .type = BLOCK_EXPORT_TYPE_VDUSE_BLK, + .instance_size = sizeof(VduseBlkExport), + .create = vduse_blk_exp_create, + .delete = vduse_blk_exp_delete, + .request_shutdown = vduse_blk_exp_request_shutdown, +}; diff --git a/block/export/vduse-blk.h b/block/export/vduse-blk.h new file mode 100644 index 0000000000..c4eeb1b70e --- /dev/null +++ b/block/export/vduse-blk.h @@ -0,0 +1,20 @@ +/* + * Export QEMU block device via VDUSE + * + * Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: + * Xie Yongji <xieyongji@bytedance.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. + */ + +#ifndef VDUSE_BLK_H +#define VDUSE_BLK_H + +#include "block/export.h" + +extern const BlockExportDriver blk_exp_vduse_blk; + +#endif /* VDUSE_BLK_H */ diff --git a/block/export/vhost-user-blk-server.c b/block/export/vhost-user-blk-server.c index a129204c44..3409d9e02e 100644 --- a/block/export/vhost-user-blk-server.c +++ b/block/export/vhost-user-blk-server.c @@ -17,31 +17,15 @@ #include "vhost-user-blk-server.h" #include "qapi/error.h" #include "qom/object_interfaces.h" -#include "sysemu/block-backend.h" #include "util/block-helpers.h" - -/* - * Sector units are 512 bytes regardless of the - * virtio_blk_config->blk_size value. - */ -#define VIRTIO_BLK_SECTOR_BITS 9 -#define VIRTIO_BLK_SECTOR_SIZE (1ull << VIRTIO_BLK_SECTOR_BITS) +#include "virtio-blk-handler.h" enum { VHOST_USER_BLK_NUM_QUEUES_DEFAULT = 1, - VHOST_USER_BLK_MAX_DISCARD_SECTORS = 32768, - VHOST_USER_BLK_MAX_WRITE_ZEROES_SECTORS = 32768, -}; -struct virtio_blk_inhdr { - unsigned char status; }; typedef struct VuBlkReq { VuVirtqElement elem; - int64_t sector_num; - size_t size; - struct virtio_blk_inhdr *in; - struct virtio_blk_outhdr out; VuServer *server; struct VuVirtq *vq; } VuBlkReq; @@ -50,248 +34,44 @@ typedef struct VuBlkReq { typedef struct { BlockExport export; VuServer vu_server; - uint32_t blk_size; + VirtioBlkHandler handler; QIOChannelSocket *sioc; struct virtio_blk_config blkcfg; - bool writable; } VuBlkExport; -static void vu_blk_req_complete(VuBlkReq *req) +static void vu_blk_req_complete(VuBlkReq *req, size_t in_len) { VuDev *vu_dev = &req->server->vu_dev; - /* IO size with 1 extra status byte */ - vu_queue_push(vu_dev, req->vq, &req->elem, req->size + 1); + vu_queue_push(vu_dev, req->vq, &req->elem, in_len); vu_queue_notify(vu_dev, req->vq); free(req); } -static bool vu_blk_sect_range_ok(VuBlkExport *vexp, uint64_t sector, - size_t size) -{ - uint64_t nb_sectors; - uint64_t total_sectors; - - if (size % VIRTIO_BLK_SECTOR_SIZE) { - return false; - } - - nb_sectors = size >> VIRTIO_BLK_SECTOR_BITS; - - QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != VIRTIO_BLK_SECTOR_SIZE); - if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) { - return false; - } - if ((sector << VIRTIO_BLK_SECTOR_BITS) % vexp->blk_size) { - return false; - } - blk_get_geometry(vexp->export.blk, &total_sectors); - if (sector > total_sectors || nb_sectors > total_sectors - sector) { - return false; - } - return true; -} - -static int coroutine_fn -vu_blk_discard_write_zeroes(VuBlkExport *vexp, struct iovec *iov, - uint32_t iovcnt, uint32_t type) -{ - BlockBackend *blk = vexp->export.blk; - struct virtio_blk_discard_write_zeroes desc; - ssize_t size; - uint64_t sector; - uint32_t num_sectors; - uint32_t max_sectors; - uint32_t flags; - int bytes; - - /* Only one desc is currently supported */ - if (unlikely(iov_size(iov, iovcnt) > sizeof(desc))) { - return VIRTIO_BLK_S_UNSUPP; - } - - size = iov_to_buf(iov, iovcnt, 0, &desc, sizeof(desc)); - if (unlikely(size != sizeof(desc))) { - error_report("Invalid size %zd, expected %zu", size, sizeof(desc)); - return VIRTIO_BLK_S_IOERR; - } - - sector = le64_to_cpu(desc.sector); - num_sectors = le32_to_cpu(desc.num_sectors); - flags = le32_to_cpu(desc.flags); - max_sectors = (type == VIRTIO_BLK_T_WRITE_ZEROES) ? - VHOST_USER_BLK_MAX_WRITE_ZEROES_SECTORS : - VHOST_USER_BLK_MAX_DISCARD_SECTORS; - - /* This check ensures that 'bytes' fits in an int */ - if (unlikely(num_sectors > max_sectors)) { - return VIRTIO_BLK_S_IOERR; - } - - bytes = num_sectors << VIRTIO_BLK_SECTOR_BITS; - - if (unlikely(!vu_blk_sect_range_ok(vexp, sector, bytes))) { - return VIRTIO_BLK_S_IOERR; - } - - /* - * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard - * and write zeroes commands if any unknown flag is set. - */ - if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { - return VIRTIO_BLK_S_UNSUPP; - } - - if (type == VIRTIO_BLK_T_WRITE_ZEROES) { - int blk_flags = 0; - - if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) { - blk_flags |= BDRV_REQ_MAY_UNMAP; - } - - if (blk_co_pwrite_zeroes(blk, sector << VIRTIO_BLK_SECTOR_BITS, - bytes, blk_flags) == 0) { - return VIRTIO_BLK_S_OK; - } - } else if (type == VIRTIO_BLK_T_DISCARD) { - /* - * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for - * discard commands if the unmap flag is set. - */ - if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { - return VIRTIO_BLK_S_UNSUPP; - } - - if (blk_co_pdiscard(blk, sector << VIRTIO_BLK_SECTOR_BITS, - bytes) == 0) { - return VIRTIO_BLK_S_OK; - } - } - - return VIRTIO_BLK_S_IOERR; -} - /* Called with server refcount increased, must decrease before returning */ static void coroutine_fn vu_blk_virtio_process_req(void *opaque) { VuBlkReq *req = opaque; VuServer *server = req->server; VuVirtqElement *elem = &req->elem; - uint32_t type; - VuBlkExport *vexp = container_of(server, VuBlkExport, vu_server); - BlockBackend *blk = vexp->export.blk; - + VirtioBlkHandler *handler = &vexp->handler; struct iovec *in_iov = elem->in_sg; struct iovec *out_iov = elem->out_sg; unsigned in_num = elem->in_num; unsigned out_num = elem->out_num; - - /* refer to hw/block/virtio_blk.c */ - if (elem->out_num < 1 || elem->in_num < 1) { - error_report("virtio-blk request missing headers"); - goto err; - } - - if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out, - sizeof(req->out)) != sizeof(req->out))) { - error_report("virtio-blk request outhdr too short"); - goto err; - } - - iov_discard_front(&out_iov, &out_num, sizeof(req->out)); - - if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { - error_report("virtio-blk request inhdr too short"); - goto err; - } - - /* We always touch the last byte, so just see how big in_iov is. */ - req->in = (void *)in_iov[in_num - 1].iov_base - + in_iov[in_num - 1].iov_len - - sizeof(struct virtio_blk_inhdr); - iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr)); - - type = le32_to_cpu(req->out.type); - switch (type & ~VIRTIO_BLK_T_BARRIER) { - case VIRTIO_BLK_T_IN: - case VIRTIO_BLK_T_OUT: { - QEMUIOVector qiov; - int64_t offset; - ssize_t ret = 0; - bool is_write = type & VIRTIO_BLK_T_OUT; - req->sector_num = le64_to_cpu(req->out.sector); - - if (is_write && !vexp->writable) { - req->in->status = VIRTIO_BLK_S_IOERR; - break; - } - - if (is_write) { - qemu_iovec_init_external(&qiov, out_iov, out_num); - } else { - qemu_iovec_init_external(&qiov, in_iov, in_num); - } - - if (unlikely(!vu_blk_sect_range_ok(vexp, - req->sector_num, - qiov.size))) { - req->in->status = VIRTIO_BLK_S_IOERR; - break; - } - - offset = req->sector_num << VIRTIO_BLK_SECTOR_BITS; - - if (is_write) { - ret = blk_co_pwritev(blk, offset, qiov.size, &qiov, 0); - } else { - ret = blk_co_preadv(blk, offset, qiov.size, &qiov, 0); - } - if (ret >= 0) { - req->in->status = VIRTIO_BLK_S_OK; - } else { - req->in->status = VIRTIO_BLK_S_IOERR; - } - break; - } - case VIRTIO_BLK_T_FLUSH: - if (blk_co_flush(blk) == 0) { - req->in->status = VIRTIO_BLK_S_OK; - } else { - req->in->status = VIRTIO_BLK_S_IOERR; - } - break; - case VIRTIO_BLK_T_GET_ID: { - size_t size = MIN(iov_size(&elem->in_sg[0], in_num), - VIRTIO_BLK_ID_BYTES); - snprintf(elem->in_sg[0].iov_base, size, "%s", "vhost_user_blk"); - req->in->status = VIRTIO_BLK_S_OK; - req->size = elem->in_sg[0].iov_len; - break; + int in_len; + + in_len = virtio_blk_process_req(handler, in_iov, out_iov, + in_num, out_num); + if (in_len < 0) { + free(req); + vhost_user_server_unref(server); + return; } - case VIRTIO_BLK_T_DISCARD: - case VIRTIO_BLK_T_WRITE_ZEROES: { - if (!vexp->writable) { - req->in->status = VIRTIO_BLK_S_IOERR; - break; - } - - req->in->status = vu_blk_discard_write_zeroes(vexp, out_iov, out_num, - type); - break; - } - default: - req->in->status = VIRTIO_BLK_S_UNSUPP; - break; - } - - vu_blk_req_complete(req); - vhost_user_server_unref(server); - return; -err: - free(req); + vu_blk_req_complete(req, in_len); vhost_user_server_unref(server); } @@ -348,7 +128,7 @@ static uint64_t vu_blk_get_features(VuDev *dev) 1ull << VIRTIO_RING_F_EVENT_IDX | 1ull << VHOST_USER_F_PROTOCOL_FEATURES; - if (!vexp->writable) { + if (!vexp->handler.writable) { features |= 1ull << VIRTIO_BLK_F_RO; } @@ -455,12 +235,12 @@ vu_blk_initialize_config(BlockDriverState *bs, config->opt_io_size = cpu_to_le32(1); config->num_queues = cpu_to_le16(num_queues); config->max_discard_sectors = - cpu_to_le32(VHOST_USER_BLK_MAX_DISCARD_SECTORS); + cpu_to_le32(VIRTIO_BLK_MAX_DISCARD_SECTORS); config->max_discard_seg = cpu_to_le32(1); config->discard_sector_alignment = cpu_to_le32(blk_size >> VIRTIO_BLK_SECTOR_BITS); config->max_write_zeroes_sectors - = cpu_to_le32(VHOST_USER_BLK_MAX_WRITE_ZEROES_SECTORS); + = cpu_to_le32(VIRTIO_BLK_MAX_WRITE_ZEROES_SECTORS); config->max_write_zeroes_seg = cpu_to_le32(1); } @@ -480,7 +260,6 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts, uint64_t logical_block_size; uint16_t num_queues = VHOST_USER_BLK_NUM_QUEUES_DEFAULT; - vexp->writable = opts->writable; vexp->blkcfg.wce = 0; if (vu_opts->has_logical_block_size) { @@ -494,8 +273,6 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts, error_propagate(errp, local_err); return -EINVAL; } - vexp->blk_size = logical_block_size; - blk_set_guest_block_size(exp->blk, logical_block_size); if (vu_opts->has_num_queues) { num_queues = vu_opts->num_queues; @@ -504,6 +281,10 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts, error_setg(errp, "num-queues must be greater than 0"); return -EINVAL; } + vexp->handler.blk = exp->blk; + vexp->handler.serial = g_strdup("vhost_user_blk"); + vexp->handler.logical_block_size = logical_block_size; + vexp->handler.writable = opts->writable; vu_blk_initialize_config(blk_bs(exp->blk), &vexp->blkcfg, logical_block_size, num_queues); @@ -515,6 +296,7 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts, num_queues, &vu_blk_iface, errp)) { blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach, vexp); + g_free(vexp->handler.serial); return -EADDRNOTAVAIL; } @@ -527,6 +309,7 @@ static void vu_blk_exp_delete(BlockExport *exp) blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach, vexp); + g_free(vexp->handler.serial); } const BlockExportDriver blk_exp_vhost_user_blk = { diff --git a/block/export/virtio-blk-handler.c b/block/export/virtio-blk-handler.c new file mode 100644 index 0000000000..313666e8ab --- /dev/null +++ b/block/export/virtio-blk-handler.c @@ -0,0 +1,240 @@ +/* + * Handler for virtio-blk I/O + * + * Copyright (c) 2020 Red Hat, Inc. + * Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: + * Coiby Xu <coiby.xu@gmail.com> + * Xie Yongji <xieyongji@bytedance.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 "qemu/error-report.h" +#include "virtio-blk-handler.h" + +#include "standard-headers/linux/virtio_blk.h" + +struct virtio_blk_inhdr { + unsigned char status; +}; + +static bool virtio_blk_sect_range_ok(BlockBackend *blk, uint32_t block_size, + uint64_t sector, size_t size) +{ + uint64_t nb_sectors; + uint64_t total_sectors; + + if (size % VIRTIO_BLK_SECTOR_SIZE) { + return false; + } + + nb_sectors = size >> VIRTIO_BLK_SECTOR_BITS; + + QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != VIRTIO_BLK_SECTOR_SIZE); + if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) { + return false; + } + if ((sector << VIRTIO_BLK_SECTOR_BITS) % block_size) { + return false; + } + blk_get_geometry(blk, &total_sectors); + if (sector > total_sectors || nb_sectors > total_sectors - sector) { + return false; + } + return true; +} + +static int coroutine_fn +virtio_blk_discard_write_zeroes(VirtioBlkHandler *handler, struct iovec *iov, + uint32_t iovcnt, uint32_t type) +{ + BlockBackend *blk = handler->blk; + struct virtio_blk_discard_write_zeroes desc; + ssize_t size; + uint64_t sector; + uint32_t num_sectors; + uint32_t max_sectors; + uint32_t flags; + int bytes; + + /* Only one desc is currently supported */ + if (unlikely(iov_size(iov, iovcnt) > sizeof(desc))) { + return VIRTIO_BLK_S_UNSUPP; + } + + size = iov_to_buf(iov, iovcnt, 0, &desc, sizeof(desc)); + if (unlikely(size != sizeof(desc))) { + error_report("Invalid size %zd, expected %zu", size, sizeof(desc)); + return VIRTIO_BLK_S_IOERR; + } + + sector = le64_to_cpu(desc.sector); + num_sectors = le32_to_cpu(desc.num_sectors); + flags = le32_to_cpu(desc.flags); + max_sectors = (type == VIRTIO_BLK_T_WRITE_ZEROES) ? + VIRTIO_BLK_MAX_WRITE_ZEROES_SECTORS : + VIRTIO_BLK_MAX_DISCARD_SECTORS; + + /* This check ensures that 'bytes' fits in an int */ + if (unlikely(num_sectors > max_sectors)) { + return VIRTIO_BLK_S_IOERR; + } + + bytes = num_sectors << VIRTIO_BLK_SECTOR_BITS; + + if (unlikely(!virtio_blk_sect_range_ok(blk, handler->logical_block_size, + sector, bytes))) { + return VIRTIO_BLK_S_IOERR; + } + + /* + * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard + * and write zeroes commands if any unknown flag is set. + */ + if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { + return VIRTIO_BLK_S_UNSUPP; + } + + if (type == VIRTIO_BLK_T_WRITE_ZEROES) { + int blk_flags = 0; + + if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) { + blk_flags |= BDRV_REQ_MAY_UNMAP; + } + + if (blk_co_pwrite_zeroes(blk, sector << VIRTIO_BLK_SECTOR_BITS, + bytes, blk_flags) == 0) { + return VIRTIO_BLK_S_OK; + } + } else if (type == VIRTIO_BLK_T_DISCARD) { + /* + * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for + * discard commands if the unmap flag is set. + */ + if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { + return VIRTIO_BLK_S_UNSUPP; + } + + if (blk_co_pdiscard(blk, sector << VIRTIO_BLK_SECTOR_BITS, + bytes) == 0) { + return VIRTIO_BLK_S_OK; + } + } + + return VIRTIO_BLK_S_IOERR; +} + +int coroutine_fn virtio_blk_process_req(VirtioBlkHandler *handler, + struct iovec *in_iov, + struct iovec *out_iov, + unsigned int in_num, + unsigned int out_num) +{ + BlockBackend *blk = handler->blk; + struct virtio_blk_inhdr *in; + struct virtio_blk_outhdr out; + uint32_t type; + int in_len; + + if (out_num < 1 || in_num < 1) { + error_report("virtio-blk request missing headers"); + return -EINVAL; + } + + if (unlikely(iov_to_buf(out_iov, out_num, 0, &out, + sizeof(out)) != sizeof(out))) { + error_report("virtio-blk request outhdr too short"); + return -EINVAL; + } + + iov_discard_front(&out_iov, &out_num, sizeof(out)); + + if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { + error_report("virtio-blk request inhdr too short"); + return -EINVAL; + } + + /* We always touch the last byte, so just see how big in_iov is. */ + in_len = iov_size(in_iov, in_num); + in = (void *)in_iov[in_num - 1].iov_base + + in_iov[in_num - 1].iov_len + - sizeof(struct virtio_blk_inhdr); + iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr)); + + type = le32_to_cpu(out.type); + switch (type & ~VIRTIO_BLK_T_BARRIER) { + case VIRTIO_BLK_T_IN: + case VIRTIO_BLK_T_OUT: { + QEMUIOVector qiov; + int64_t offset; + ssize_t ret = 0; + bool is_write = type & VIRTIO_BLK_T_OUT; + int64_t sector_num = le64_to_cpu(out.sector); + + if (is_write && !handler->writable) { + in->status = VIRTIO_BLK_S_IOERR; + break; + } + + if (is_write) { + qemu_iovec_init_external(&qiov, out_iov, out_num); + } else { + qemu_iovec_init_external(&qiov, in_iov, in_num); + } + + if (unlikely(!virtio_blk_sect_range_ok(blk, + handler->logical_block_size, + sector_num, qiov.size))) { + in->status = VIRTIO_BLK_S_IOERR; + break; + } + + offset = sector_num << VIRTIO_BLK_SECTOR_BITS; + + if (is_write) { + ret = blk_co_pwritev(blk, offset, qiov.size, &qiov, 0); + } else { + ret = blk_co_preadv(blk, offset, qiov.size, &qiov, 0); + } + if (ret >= 0) { + in->status = VIRTIO_BLK_S_OK; + } else { + in->status = VIRTIO_BLK_S_IOERR; + } + break; + } + case VIRTIO_BLK_T_FLUSH: + if (blk_co_flush(blk) == 0) { + in->status = VIRTIO_BLK_S_OK; + } else { + in->status = VIRTIO_BLK_S_IOERR; + } + break; + case VIRTIO_BLK_T_GET_ID: { + size_t size = MIN(strlen(handler->serial) + 1, + MIN(iov_size(in_iov, in_num), + VIRTIO_BLK_ID_BYTES)); + iov_from_buf(in_iov, in_num, 0, handler->serial, size); + in->status = VIRTIO_BLK_S_OK; + break; + } + case VIRTIO_BLK_T_DISCARD: + case VIRTIO_BLK_T_WRITE_ZEROES: + if (!handler->writable) { + in->status = VIRTIO_BLK_S_IOERR; + break; + } + in->status = virtio_blk_discard_write_zeroes(handler, out_iov, + out_num, type); + break; + default: + in->status = VIRTIO_BLK_S_UNSUPP; + break; + } + + return in_len; +} diff --git a/block/export/virtio-blk-handler.h b/block/export/virtio-blk-handler.h new file mode 100644 index 0000000000..150d44cff2 --- /dev/null +++ b/block/export/virtio-blk-handler.h @@ -0,0 +1,37 @@ +/* + * Handler for virtio-blk I/O + * + * Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: + * Xie Yongji <xieyongji@bytedance.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. + */ + +#ifndef VIRTIO_BLK_HANDLER_H +#define VIRTIO_BLK_HANDLER_H + +#include "sysemu/block-backend.h" + +#define VIRTIO_BLK_SECTOR_BITS 9 +#define VIRTIO_BLK_SECTOR_SIZE (1ULL << VIRTIO_BLK_SECTOR_BITS) + +#define VIRTIO_BLK_MAX_DISCARD_SECTORS 32768 +#define VIRTIO_BLK_MAX_WRITE_ZEROES_SECTORS 32768 + +typedef struct { + BlockBackend *blk; + char *serial; + uint32_t logical_block_size; + bool writable; +} VirtioBlkHandler; + +int coroutine_fn virtio_blk_process_req(VirtioBlkHandler *handler, + struct iovec *in_iov, + struct iovec *out_iov, + unsigned int in_num, + unsigned int out_num); + +#endif /* VIRTIO_BLK_HANDLER_H */ diff --git a/block/gluster.c b/block/gluster.c index 398976bc66..b60213ab80 100644 --- a/block/gluster.c +++ b/block/gluster.c @@ -891,7 +891,7 @@ out: static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp) { bs->bl.max_transfer = GLUSTER_MAX_TRANSFER; - bs->bl.max_pdiscard = SIZE_MAX; + bs->bl.max_pdiscard = MIN(SIZE_MAX, INT64_MAX); } static int qemu_gluster_reopen_prepare(BDRVReopenState *state, diff --git a/block/io.c b/block/io.c index 789e6373d5..1e9bf09a49 100644 --- a/block/io.c +++ b/block/io.c @@ -588,21 +588,6 @@ void bdrv_unapply_subtree_drain(BdrvChild *child, BlockDriverState *old_parent) BDRV_POLL_WHILE(child->bs, qatomic_read(&drained_end_counter) > 0); } -/* - * Wait for pending requests to complete on a single BlockDriverState subtree, - * and suspend block driver's internal I/O until next request arrives. - * - * Note that unlike bdrv_drain_all(), the caller must hold the BlockDriverState - * AioContext. - */ -void coroutine_fn bdrv_co_drain(BlockDriverState *bs) -{ - IO_OR_GS_CODE(); - assert(qemu_in_coroutine()); - bdrv_drained_begin(bs); - bdrv_drained_end(bs); -} - void bdrv_drain(BlockDriverState *bs) { IO_OR_GS_CODE(); diff --git a/block/monitor/bitmap-qmp-cmds.c b/block/monitor/bitmap-qmp-cmds.c index 2b677c4a2f..282363606f 100644 --- a/block/monitor/bitmap-qmp-cmds.c +++ b/block/monitor/bitmap-qmp-cmds.c @@ -261,8 +261,9 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, HBitmap **backup, Error **errp) { BlockDriverState *bs; - BdrvDirtyBitmap *dst, *src, *anon; + BdrvDirtyBitmap *dst, *src; BlockDirtyBitmapOrStrList *lst; + HBitmap *local_backup = NULL; GLOBAL_STATE_CODE(); @@ -271,12 +272,6 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, return NULL; } - anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), - NULL, errp); - if (!anon) { - return NULL; - } - for (lst = bms; lst; lst = lst->next) { switch (lst->value->type) { const char *name, *node; @@ -285,8 +280,7 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, src = bdrv_find_dirty_bitmap(bs, name); if (!src) { error_setg(errp, "Dirty bitmap '%s' not found", name); - dst = NULL; - goto out; + goto fail; } break; case QTYPE_QDICT: @@ -294,26 +288,36 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, name = lst->value->u.external.name; src = block_dirty_bitmap_lookup(node, name, NULL, errp); if (!src) { - dst = NULL; - goto out; + goto fail; } break; default: abort(); } - if (!bdrv_merge_dirty_bitmap(anon, src, NULL, errp)) { - dst = NULL; - goto out; + /* We do backup only for first merge operation */ + if (!bdrv_merge_dirty_bitmap(dst, src, + local_backup ? NULL : &local_backup, + errp)) + { + goto fail; } } - /* Merge into dst; dst is unchanged on failure. */ - bdrv_merge_dirty_bitmap(dst, anon, backup, errp); + if (backup) { + *backup = local_backup; + } else { + hbitmap_free(local_backup); + } - out: - bdrv_release_dirty_bitmap(anon); return dst; + +fail: + if (local_backup) { + bdrv_restore_dirty_bitmap(dst, local_backup); + } + + return NULL; } void qmp_block_dirty_bitmap_merge(const char *node, const char *target, diff --git a/block/nbd.c b/block/nbd.c index 6085ab1d2c..7f5f50ec46 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -521,12 +521,8 @@ static int coroutine_fn nbd_co_send_request(BlockDriverState *bs, if (qiov) { qio_channel_set_cork(s->ioc, true); rc = nbd_send_request(s->ioc, request); - if (rc >= 0) { - if (qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov, - NULL) < 0) { - rc = -EIO; - } - } else if (rc >= 0) { + if (rc >= 0 && qio_channel_writev_all(s->ioc, qiov->iov, qiov->niov, + NULL) < 0) { rc = -EIO; } qio_channel_set_cork(s->ioc, false); diff --git a/block/rbd.c b/block/rbd.c index 6caf35cbba..f826410f40 100644 --- a/block/rbd.c +++ b/block/rbd.c @@ -831,6 +831,26 @@ static int qemu_rbd_connect(rados_t *cluster, rados_ioctx_t *io_ctx, error_setg_errno(errp, -r, "error opening pool %s", opts->pool); goto failed_shutdown; } + +#ifdef HAVE_RBD_NAMESPACE_EXISTS + if (opts->has_q_namespace && strlen(opts->q_namespace) > 0) { + bool exists; + + r = rbd_namespace_exists(*io_ctx, opts->q_namespace, &exists); + if (r < 0) { + error_setg_errno(errp, -r, "error checking namespace"); + goto failed_ioctx_destroy; + } + + if (!exists) { + error_setg(errp, "namespace '%s' does not exist", + opts->q_namespace); + r = -ENOENT; + goto failed_ioctx_destroy; + } + } +#endif + /* * Set the namespace after opening the io context on the pool, * if nspace == NULL or if nspace == "", it is just as we did nothing @@ -840,6 +860,10 @@ static int qemu_rbd_connect(rados_t *cluster, rados_ioctx_t *io_ctx, r = 0; goto out; +#ifdef HAVE_RBD_NAMESPACE_EXISTS +failed_ioctx_destroy: + rados_ioctx_destroy(*io_ctx); +#endif failed_shutdown: rados_shutdown(*cluster); out: diff --git a/docs/tools/qemu-storage-daemon.rst b/docs/tools/qemu-storage-daemon.rst index 8b97592663..ea00149a63 100644 --- a/docs/tools/qemu-storage-daemon.rst +++ b/docs/tools/qemu-storage-daemon.rst @@ -77,6 +77,7 @@ Standard options: --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,addr.type=unix,addr.path=<socket-path>[,writable=on|off][,logical-block-size=<block-size>][,num-queues=<num-queues>] --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,addr.type=fd,addr.str=<fd>[,writable=on|off][,logical-block-size=<block-size>][,num-queues=<num-queues>] --export [type=]fuse,id=<id>,node-name=<node-name>,mountpoint=<file>[,growable=on|off][,writable=on|off][,allow-other=on|off|auto] + --export [type=]vduse-blk,id=<id>,node-name=<node-name>,name=<vduse-name>[,writable=on|off][,num-queues=<num-queues>][,queue-size=<queue-size>][,logical-block-size=<block-size>][,serial=<serial-number>] is a block export definition. ``node-name`` is the block node that should be exported. ``writable`` determines whether or not the export allows write @@ -110,6 +111,27 @@ Standard options: ``allow-other`` to auto (the default) will try enabling this option, and on error fall back to disabling it. + The ``vduse-blk`` export type takes a ``name`` (must be unique across the host) + to create the VDUSE device. + ``num-queues`` sets the number of virtqueues (the default is 1). + ``queue-size`` sets the virtqueue descriptor table size (the default is 256). + + The instantiated VDUSE device must then be added to the vDPA bus using the + vdpa(8) command from the iproute2 project:: + + # vdpa dev add name <id> mgmtdev vduse + + The device can be removed from the vDPA bus later as follows:: + + # vdpa dev del <id> + + For more information about attaching vDPA devices to the host with + virtio_vdpa.ko or attaching them to guests with vhost_vdpa.ko, see + https://vdpa-dev.gitlab.io/. + + For more information about VDUSE, see + https://docs.kernel.org/userspace-api/vduse.html. + .. option:: --monitor MONITORDEF is a QMP monitor definition. See the :manpage:`qemu(1)` manual page for diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index cd804795c6..e9ba752f6b 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -1228,7 +1228,6 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp) s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); blk_set_dev_ops(s->blk, &virtio_block_ops, s); - blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size); blk_iostatus_enable(s->blk); diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c index 674953f1ad..345b284d70 100644 --- a/hw/block/xen-block.c +++ b/hw/block/xen-block.c @@ -243,7 +243,6 @@ static void xen_block_realize(XenDevice *xendev, Error **errp) } blk_set_dev_ops(blk, &xen_block_dev_ops, blockdev); - blk_set_guest_block_size(blk, conf->logical_block_size); if (conf->discard_granularity == -1) { conf->discard_granularity = conf->physical_block_size; diff --git a/hw/ide/core.c b/hw/ide/core.c index c2caa54285..7cbc0a54a7 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -2548,7 +2548,6 @@ int ide_init_drive(IDEState *s, BlockBackend *blk, IDEDriveKind kind, s->smart_selftest_count = 0; if (kind == IDE_CD) { blk_set_dev_ops(blk, &ide_cd_block_ops, s); - blk_set_guest_block_size(blk, 2048); } else { if (!blk_is_inserted(s->blk)) { error_setg(errp, "Device needs media, but drive is empty"); diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c index 072686ed58..91acb5c0ce 100644 --- a/hw/scsi/scsi-disk.c +++ b/hw/scsi/scsi-disk.c @@ -2419,7 +2419,6 @@ static void scsi_realize(SCSIDevice *dev, Error **errp) } else { blk_set_dev_ops(s->qdev.conf.blk, &scsi_disk_block_ops, s); } - blk_set_guest_block_size(s->qdev.conf.blk, s->qdev.blocksize); blk_iostatus_enable(s->qdev.conf.blk); diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c index 0ab00ef85c..ada24d7486 100644 --- a/hw/scsi/scsi-generic.c +++ b/hw/scsi/scsi-generic.c @@ -321,7 +321,6 @@ static void scsi_read_complete(void * opaque, int ret) s->blocksize = ldl_be_p(&r->buf[8]); s->max_lba = ldq_be_p(&r->buf[0]); } - blk_set_guest_block_size(s->conf.blk, s->blocksize); /* * Patch MODE SENSE device specific parameters if the BDS is opened diff --git a/include/block/aio-wait.h b/include/block/aio-wait.h index b39eefb38d..54840f8622 100644 --- a/include/block/aio-wait.h +++ b/include/block/aio-wait.h @@ -81,6 +81,8 @@ extern AioWait global_aio_wait; AioContext *ctx_ = (ctx); \ /* Increment wait_->num_waiters before evaluating cond. */ \ qatomic_inc(&wait_->num_waiters); \ + /* Paired with smp_mb in aio_wait_kick(). */ \ + smp_mb(); \ if (ctx_ && in_aio_context_home_thread(ctx_)) { \ while ((cond)) { \ aio_poll(ctx_, true); \ diff --git a/include/block/block-io.h b/include/block/block-io.h index 62c84f0519..053a27141a 100644 --- a/include/block/block-io.h +++ b/include/block/block-io.h @@ -270,7 +270,6 @@ void bdrv_drained_end_no_poll(BlockDriverState *bs, int *drained_end_counter); cond); }) void bdrv_drain(BlockDriverState *bs); -void coroutine_fn bdrv_co_drain(BlockDriverState *bs); int generated_co_wrapper bdrv_truncate(BdrvChild *child, int64_t offset, bool exact, diff --git a/include/block/block_int-io.h b/include/block/block_int-io.h index bb454200e5..ded29e7494 100644 --- a/include/block/block_int-io.h +++ b/include/block/block_int-io.h @@ -102,7 +102,7 @@ bool blk_dev_is_tray_open(BlockBackend *blk); void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes); void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out); -bool bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest, +void bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src, HBitmap **backup, bool lock); diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h index 5bd986aa44..af4e4ab746 100644 --- a/include/qemu/hbitmap.h +++ b/include/qemu/hbitmap.h @@ -76,20 +76,9 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size); * * Store result of merging @a and @b into @result. * @result is allowed to be equal to @a or @b. - * - * Return true if the merge was successful, - * false if it was not attempted. - */ -bool hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result); - -/** - * hbitmap_can_merge: - * - * hbitmap_can_merge(a, b) && hbitmap_can_merge(a, result) is sufficient and - * necessary for hbitmap_merge will not fail. - * + * All bitmaps must have same size. */ -bool hbitmap_can_merge(const HBitmap *a, const HBitmap *b); +void hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result); /** * hbitmap_empty: diff --git a/include/sysemu/block-backend-io.h b/include/sysemu/block-backend-io.h index 6517c39295..ccef514023 100644 --- a/include/sysemu/block-backend-io.h +++ b/include/sysemu/block-backend-io.h @@ -72,7 +72,6 @@ void blk_error_action(BlockBackend *blk, BlockErrorAction action, void blk_iostatus_set_err(BlockBackend *blk, int error); int blk_get_max_iov(BlockBackend *blk); int blk_get_max_hw_iov(BlockBackend *blk); -void blk_set_guest_block_size(BlockBackend *blk, int align); void blk_io_plug(BlockBackend *blk); void blk_io_unplug(BlockBackend *blk); diff --git a/linux-headers/linux/vduse.h b/linux-headers/linux/vduse.h new file mode 100644 index 0000000000..d47b004ce6 --- /dev/null +++ b/linux-headers/linux/vduse.h @@ -0,0 +1,306 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _VDUSE_H_ +#define _VDUSE_H_ + +#include <linux/types.h> + +#define VDUSE_BASE 0x81 + +/* The ioctls for control device (/dev/vduse/control) */ + +#define VDUSE_API_VERSION 0 + +/* + * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION). + * This is used for future extension. + */ +#define VDUSE_GET_API_VERSION _IOR(VDUSE_BASE, 0x00, __u64) + +/* Set the version of VDUSE API that userspace supported. */ +#define VDUSE_SET_API_VERSION _IOW(VDUSE_BASE, 0x01, __u64) + +/** + * struct vduse_dev_config - basic configuration of a VDUSE device + * @name: VDUSE device name, needs to be NUL terminated + * @vendor_id: virtio vendor id + * @device_id: virtio device id + * @features: virtio features + * @vq_num: the number of virtqueues + * @vq_align: the allocation alignment of virtqueue's metadata + * @reserved: for future use, needs to be initialized to zero + * @config_size: the size of the configuration space + * @config: the buffer of the configuration space + * + * Structure used by VDUSE_CREATE_DEV ioctl to create VDUSE device. + */ +struct vduse_dev_config { +#define VDUSE_NAME_MAX 256 + char name[VDUSE_NAME_MAX]; + __u32 vendor_id; + __u32 device_id; + __u64 features; + __u32 vq_num; + __u32 vq_align; + __u32 reserved[13]; + __u32 config_size; + __u8 config[]; +}; + +/* Create a VDUSE device which is represented by a char device (/dev/vduse/$NAME) */ +#define VDUSE_CREATE_DEV _IOW(VDUSE_BASE, 0x02, struct vduse_dev_config) + +/* + * Destroy a VDUSE device. Make sure there are no more references + * to the char device (/dev/vduse/$NAME). + */ +#define VDUSE_DESTROY_DEV _IOW(VDUSE_BASE, 0x03, char[VDUSE_NAME_MAX]) + +/* The ioctls for VDUSE device (/dev/vduse/$NAME) */ + +/** + * struct vduse_iotlb_entry - entry of IOTLB to describe one IOVA region [start, last] + * @offset: the mmap offset on returned file descriptor + * @start: start of the IOVA region + * @last: last of the IOVA region + * @perm: access permission of the IOVA region + * + * Structure used by VDUSE_IOTLB_GET_FD ioctl to find an overlapped IOVA region. + */ +struct vduse_iotlb_entry { + __u64 offset; + __u64 start; + __u64 last; +#define VDUSE_ACCESS_RO 0x1 +#define VDUSE_ACCESS_WO 0x2 +#define VDUSE_ACCESS_RW 0x3 + __u8 perm; +}; + +/* + * Find the first IOVA region that overlaps with the range [start, last] + * and return the corresponding file descriptor. Return -EINVAL means the + * IOVA region doesn't exist. Caller should set start and last fields. + */ +#define VDUSE_IOTLB_GET_FD _IOWR(VDUSE_BASE, 0x10, struct vduse_iotlb_entry) + +/* + * Get the negotiated virtio features. It's a subset of the features in + * struct vduse_dev_config which can be accepted by virtio driver. It's + * only valid after FEATURES_OK status bit is set. + */ +#define VDUSE_DEV_GET_FEATURES _IOR(VDUSE_BASE, 0x11, __u64) + +/** + * struct vduse_config_data - data used to update configuration space + * @offset: the offset from the beginning of configuration space + * @length: the length to write to configuration space + * @buffer: the buffer used to write from + * + * Structure used by VDUSE_DEV_SET_CONFIG ioctl to update device + * configuration space. + */ +struct vduse_config_data { + __u32 offset; + __u32 length; + __u8 buffer[]; +}; + +/* Set device configuration space */ +#define VDUSE_DEV_SET_CONFIG _IOW(VDUSE_BASE, 0x12, struct vduse_config_data) + +/* + * Inject a config interrupt. It's usually used to notify virtio driver + * that device configuration space has changed. + */ +#define VDUSE_DEV_INJECT_CONFIG_IRQ _IO(VDUSE_BASE, 0x13) + +/** + * struct vduse_vq_config - basic configuration of a virtqueue + * @index: virtqueue index + * @max_size: the max size of virtqueue + * @reserved: for future use, needs to be initialized to zero + * + * Structure used by VDUSE_VQ_SETUP ioctl to setup a virtqueue. + */ +struct vduse_vq_config { + __u32 index; + __u16 max_size; + __u16 reserved[13]; +}; + +/* + * Setup the specified virtqueue. Make sure all virtqueues have been + * configured before the device is attached to vDPA bus. + */ +#define VDUSE_VQ_SETUP _IOW(VDUSE_BASE, 0x14, struct vduse_vq_config) + +/** + * struct vduse_vq_state_split - split virtqueue state + * @avail_index: available index + */ +struct vduse_vq_state_split { + __u16 avail_index; +}; + +/** + * struct vduse_vq_state_packed - packed virtqueue state + * @last_avail_counter: last driver ring wrap counter observed by device + * @last_avail_idx: device available index + * @last_used_counter: device ring wrap counter + * @last_used_idx: used index + */ +struct vduse_vq_state_packed { + __u16 last_avail_counter; + __u16 last_avail_idx; + __u16 last_used_counter; + __u16 last_used_idx; +}; + +/** + * struct vduse_vq_info - information of a virtqueue + * @index: virtqueue index + * @num: the size of virtqueue + * @desc_addr: address of desc area + * @driver_addr: address of driver area + * @device_addr: address of device area + * @split: split virtqueue state + * @packed: packed virtqueue state + * @ready: ready status of virtqueue + * + * Structure used by VDUSE_VQ_GET_INFO ioctl to get virtqueue's information. + */ +struct vduse_vq_info { + __u32 index; + __u32 num; + __u64 desc_addr; + __u64 driver_addr; + __u64 device_addr; + union { + struct vduse_vq_state_split split; + struct vduse_vq_state_packed packed; + }; + __u8 ready; +}; + +/* Get the specified virtqueue's information. Caller should set index field. */ +#define VDUSE_VQ_GET_INFO _IOWR(VDUSE_BASE, 0x15, struct vduse_vq_info) + +/** + * struct vduse_vq_eventfd - eventfd configuration for a virtqueue + * @index: virtqueue index + * @fd: eventfd, -1 means de-assigning the eventfd + * + * Structure used by VDUSE_VQ_SETUP_KICKFD ioctl to setup kick eventfd. + */ +struct vduse_vq_eventfd { + __u32 index; +#define VDUSE_EVENTFD_DEASSIGN -1 + int fd; +}; + +/* + * Setup kick eventfd for specified virtqueue. The kick eventfd is used + * by VDUSE kernel module to notify userspace to consume the avail vring. + */ +#define VDUSE_VQ_SETUP_KICKFD _IOW(VDUSE_BASE, 0x16, struct vduse_vq_eventfd) + +/* + * Inject an interrupt for specific virtqueue. It's used to notify virtio driver + * to consume the used vring. + */ +#define VDUSE_VQ_INJECT_IRQ _IOW(VDUSE_BASE, 0x17, __u32) + +/* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */ + +/** + * enum vduse_req_type - request type + * @VDUSE_GET_VQ_STATE: get the state for specified virtqueue from userspace + * @VDUSE_SET_STATUS: set the device status + * @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for + * specified IOVA range via VDUSE_IOTLB_GET_FD ioctl + */ +enum vduse_req_type { + VDUSE_GET_VQ_STATE, + VDUSE_SET_STATUS, + VDUSE_UPDATE_IOTLB, +}; + +/** + * struct vduse_vq_state - virtqueue state + * @index: virtqueue index + * @split: split virtqueue state + * @packed: packed virtqueue state + */ +struct vduse_vq_state { + __u32 index; + union { + struct vduse_vq_state_split split; + struct vduse_vq_state_packed packed; + }; +}; + +/** + * struct vduse_dev_status - device status + * @status: device status + */ +struct vduse_dev_status { + __u8 status; +}; + +/** + * struct vduse_iova_range - IOVA range [start, last] + * @start: start of the IOVA range + * @last: last of the IOVA range + */ +struct vduse_iova_range { + __u64 start; + __u64 last; +}; + +/** + * struct vduse_dev_request - control request + * @type: request type + * @request_id: request id + * @reserved: for future use + * @vq_state: virtqueue state, only index field is available + * @s: device status + * @iova: IOVA range for updating + * @padding: padding + * + * Structure used by read(2) on /dev/vduse/$NAME. + */ +struct vduse_dev_request { + __u32 type; + __u32 request_id; + __u32 reserved[4]; + union { + struct vduse_vq_state vq_state; + struct vduse_dev_status s; + struct vduse_iova_range iova; + __u32 padding[32]; + }; +}; + +/** + * struct vduse_dev_response - response to control request + * @request_id: corresponding request id + * @result: the result of request + * @reserved: for future use, needs to be initialized to zero + * @vq_state: virtqueue state + * @padding: padding + * + * Structure used by write(2) on /dev/vduse/$NAME. + */ +struct vduse_dev_response { + __u32 request_id; +#define VDUSE_REQ_RESULT_OK 0x00 +#define VDUSE_REQ_RESULT_FAILED 0x01 + __u32 result; + __u32 reserved[4]; + union { + struct vduse_vq_state vq_state; + __u32 padding[32]; + }; +}; + +#endif /* _VDUSE_H_ */ diff --git a/meson.build b/meson.build index 9efcb175d1..a113078f1a 100644 --- a/meson.build +++ b/meson.build @@ -1541,6 +1541,26 @@ if get_option('fuse_lseek').allowed() endif endif +have_libvduse = (targetos == 'linux') +if get_option('libvduse').enabled() + if targetos != 'linux' + error('libvduse requires linux') + endif +elif get_option('libvduse').disabled() + have_libvduse = false +endif + +have_vduse_blk_export = (have_libvduse and targetos == 'linux') +if get_option('vduse_blk_export').enabled() + if targetos != 'linux' + error('vduse_blk_export requires linux') + elif not have_libvduse + error('vduse_blk_export requires libvduse support') + endif +elif get_option('vduse_blk_export').disabled() + have_vduse_blk_export = false +endif + # libbpf libbpf = dependency('libbpf', required: get_option('bpf'), method: 'pkg-config') if libbpf.found() and not cc.links(''' @@ -1783,6 +1803,7 @@ config_host_data.set('CONFIG_VHOST_CRYPTO', have_vhost_user_crypto) config_host_data.set('CONFIG_VHOST_VDPA', have_vhost_vdpa) config_host_data.set('CONFIG_VMNET', vmnet.found()) config_host_data.set('CONFIG_VHOST_USER_BLK_SERVER', have_vhost_user_blk_server) +config_host_data.set('CONFIG_VDUSE_BLK_EXPORT', have_vduse_blk_export) config_host_data.set('CONFIG_PNG', png.found()) config_host_data.set('CONFIG_VNC', vnc.found()) config_host_data.set('CONFIG_VNC_JPEG', jpeg.found()) @@ -1882,6 +1903,12 @@ config_host_data.set('HAVE_GETIFADDRS', cc.has_function('getifaddrs')) config_host_data.set('HAVE_OPENPTY', cc.has_function('openpty', dependencies: util)) config_host_data.set('HAVE_STRCHRNUL', cc.has_function('strchrnul')) config_host_data.set('HAVE_SYSTEM_FUNCTION', cc.has_function('system', prefix: '#include <stdlib.h>')) +if rbd.found() + config_host_data.set('HAVE_RBD_NAMESPACE_EXISTS', + cc.has_function('rbd_namespace_exists', + dependencies: rbd, + prefix: '#include <rbd/librbd.h>')) +endif if rdma.found() config_host_data.set('HAVE_IBV_ADVISE_MR', cc.has_function('ibv_advise_mr', @@ -2986,6 +3013,12 @@ if targetos == 'linux' and have_vhost_user vhost_user = libvhost_user.get_variable('vhost_user_dep') endif +libvduse = not_found +if have_libvduse + libvduse_proj = subproject('libvduse') + libvduse = libvduse_proj.get_variable('libvduse_dep') +endif + # NOTE: the trace/ subdirectory needs the qapi_trace_events variable # that is filled in by qapi/. subdir('qapi') @@ -3842,6 +3875,7 @@ if have_block summary_info += {'qed support': get_option('qed').allowed()} summary_info += {'parallels support': get_option('parallels').allowed()} summary_info += {'FUSE exports': fuse} + summary_info += {'VDUSE block exports': have_vduse_blk_export} endif summary(summary_info, bool_yn: true, section: 'Block layer support') diff --git a/meson_options.txt b/meson_options.txt index f3e2f22c1e..97c38109b1 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -257,6 +257,10 @@ option('virtfs', type: 'feature', value: 'auto', description: 'virtio-9p support') option('virtiofsd', type: 'feature', value: 'auto', description: 'build virtiofs daemon (virtiofsd)') +option('libvduse', type: 'feature', value: 'auto', + description: 'build VDUSE Library') +option('vduse_blk_export', type: 'feature', value: 'auto', + description: 'VDUSE block export support') option('capstone', type: 'feature', value: 'auto', description: 'Whether and how to find the capstone library') diff --git a/qapi/block-export.json b/qapi/block-export.json index 8afb1b65b3..4627bbc4e6 100644 --- a/qapi/block-export.json +++ b/qapi/block-export.json @@ -179,6 +179,27 @@ 'if': 'CONFIG_FUSE' } ## +# @BlockExportOptionsVduseBlk: +# +# A vduse-blk block export. +# +# @name: the name of VDUSE device (must be unique across the host). +# @num-queues: the number of virtqueues. Defaults to 1. +# @queue-size: the size of virtqueue. Defaults to 256. +# @logical-block-size: Logical block size in bytes. Range [512, PAGE_SIZE] +# and must be power of 2. Defaults to 512 bytes. +# @serial: the serial number of virtio block device. Defaults to empty string. +# +# Since: 7.1 +## +{ 'struct': 'BlockExportOptionsVduseBlk', + 'data': { 'name': 'str', + '*num-queues': 'uint16', + '*queue-size': 'uint16', + '*logical-block-size': 'size', + '*serial': 'str' } } + +## # @NbdServerAddOptions: # # An NBD block export, per legacy nbd-server-add command. @@ -284,6 +305,7 @@ # @nbd: NBD export # @vhost-user-blk: vhost-user-blk export (since 5.2) # @fuse: FUSE export (since: 6.0) +# @vduse-blk: vduse-blk export (since 7.1) # # Since: 4.2 ## @@ -291,7 +313,8 @@ 'data': [ 'nbd', { 'name': 'vhost-user-blk', 'if': 'CONFIG_VHOST_USER_BLK_SERVER' }, - { 'name': 'fuse', 'if': 'CONFIG_FUSE' } ] } + { 'name': 'fuse', 'if': 'CONFIG_FUSE' }, + { 'name': 'vduse-blk', 'if': 'CONFIG_VDUSE_BLK_EXPORT' } ] } ## # @BlockExportOptions: @@ -335,7 +358,9 @@ 'vhost-user-blk': { 'type': 'BlockExportOptionsVhostUserBlk', 'if': 'CONFIG_VHOST_USER_BLK_SERVER' }, 'fuse': { 'type': 'BlockExportOptionsFuse', - 'if': 'CONFIG_FUSE' } + 'if': 'CONFIG_FUSE' }, + 'vduse-blk': { 'type': 'BlockExportOptionsVduseBlk', + 'if': 'CONFIG_VDUSE_BLK_EXPORT' } } } ## diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh index 24eb5f35ea..d0e14fd6de 100644 --- a/scripts/meson-buildoptions.sh +++ b/scripts/meson-buildoptions.sh @@ -110,6 +110,7 @@ meson_options_help() { printf "%s\n" ' libssh ssh block device support' printf "%s\n" ' libudev Use libudev to enumerate host devices' printf "%s\n" ' libusb libusb support for USB passthrough' + printf "%s\n" ' libvduse build VDUSE Library' printf "%s\n" ' linux-aio Linux AIO support' printf "%s\n" ' linux-io-uring Linux io_uring support' printf "%s\n" ' live-block-migration' @@ -161,6 +162,8 @@ meson_options_help() { printf "%s\n" ' vhost-user vhost-user backend support' printf "%s\n" ' vhost-user-blk-server' printf "%s\n" ' build vhost-user-blk server' + printf "%s\n" ' vduse-blk-export' + printf "%s\n" ' VDUSE block export support' printf "%s\n" ' vhost-vdpa vhost-vdpa kernel backend support' printf "%s\n" ' virglrenderer virgl rendering support' printf "%s\n" ' virtfs virtio-9p support' @@ -307,6 +310,8 @@ _meson_option_parse() { --disable-libudev) printf "%s" -Dlibudev=disabled ;; --enable-libusb) printf "%s" -Dlibusb=enabled ;; --disable-libusb) printf "%s" -Dlibusb=disabled ;; + --enable-libvduse) printf "%s" -Dlibvduse=enabled ;; + --disable-libvduse) printf "%s" -Dlibvduse=disabled ;; --enable-linux-aio) printf "%s" -Dlinux_aio=enabled ;; --disable-linux-aio) printf "%s" -Dlinux_aio=disabled ;; --enable-linux-io-uring) printf "%s" -Dlinux_io_uring=enabled ;; @@ -429,6 +434,8 @@ _meson_option_parse() { --disable-vhost-user) printf "%s" -Dvhost_user=disabled ;; --enable-vhost-user-blk-server) printf "%s" -Dvhost_user_blk_server=enabled ;; --disable-vhost-user-blk-server) printf "%s" -Dvhost_user_blk_server=disabled ;; + --enable-vduse-blk-export) printf "%s" -Dvduse_blk_export=enabled ;; + --disable-vduse-blk-export) printf "%s" -Dvduse_blk_export=disabled ;; --enable-vhost-vdpa) printf "%s" -Dvhost_vdpa=enabled ;; --disable-vhost-vdpa) printf "%s" -Dvhost_vdpa=disabled ;; --enable-virglrenderer) printf "%s" -Dvirglrenderer=enabled ;; diff --git a/scripts/update-linux-headers.sh b/scripts/update-linux-headers.sh index 839a5ec614..b1ad99cba8 100755 --- a/scripts/update-linux-headers.sh +++ b/scripts/update-linux-headers.sh @@ -161,7 +161,7 @@ done rm -rf "$output/linux-headers/linux" mkdir -p "$output/linux-headers/linux" for header in kvm.h vfio.h vfio_ccw.h vfio_zdev.h vhost.h \ - psci.h psp-sev.h userfaultfd.h mman.h; do + psci.h psp-sev.h userfaultfd.h mman.h vduse.h; do cp "$tmpdir/include/linux/$header" "$output/linux-headers/linux" done diff --git a/storage-daemon/qemu-storage-daemon.c b/storage-daemon/qemu-storage-daemon.c index c104817cdd..b8e910f220 100644 --- a/storage-daemon/qemu-storage-daemon.c +++ b/storage-daemon/qemu-storage-daemon.c @@ -121,6 +121,16 @@ static void help(void) " vhost-user-blk device over file descriptor\n" "\n" #endif /* CONFIG_VHOST_USER_BLK_SERVER */ +#ifdef CONFIG_VDUSE_BLK_EXPORT +" --export [type=]vduse-blk,id=<id>,node-name=<node-name>\n" +" ,name=<vduse-name>[,writable=on|off]\n" +" [,num-queues=<num-queues>][,queue-size=<queue-size>]\n" +" [,logical-block-size=<logical-block-size>]\n" +" [,serial=<serial-number>]\n" +" export the specified block node as a\n" +" vduse-blk device\n" +"\n" +#endif /* CONFIG_VDUSE_BLK_EXPORT */ " --monitor [chardev=]name[,mode=control][,pretty[=on|off]]\n" " configure a QMP monitor\n" "\n" diff --git a/subprojects/libvduse/include/atomic.h b/subprojects/libvduse/include/atomic.h new file mode 120000 index 0000000000..8c2be64f7b --- /dev/null +++ b/subprojects/libvduse/include/atomic.h @@ -0,0 +1 @@ +../../../include/qemu/atomic.h \ No newline at end of file diff --git a/subprojects/libvduse/include/compiler.h b/subprojects/libvduse/include/compiler.h new file mode 120000 index 0000000000..de7b70697c --- /dev/null +++ b/subprojects/libvduse/include/compiler.h @@ -0,0 +1 @@ +../../../include/qemu/compiler.h \ No newline at end of file diff --git a/subprojects/libvduse/libvduse.c b/subprojects/libvduse/libvduse.c new file mode 100644 index 0000000000..9a2bcec282 --- /dev/null +++ b/subprojects/libvduse/libvduse.c @@ -0,0 +1,1375 @@ +/* + * VDUSE (vDPA Device in Userspace) library + * + * Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved. + * Portions of codes and concepts borrowed from libvhost-user.c, so: + * Copyright IBM, Corp. 2007 + * Copyright (c) 2016 Red Hat, Inc. + * + * Author: + * Xie Yongji <xieyongji@bytedance.com> + * Anthony Liguori <aliguori@us.ibm.com> + * Marc-André Lureau <mlureau@redhat.com> + * Victor Kaplansky <victork@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 <stdlib.h> +#include <stdio.h> +#include <stdbool.h> +#include <stddef.h> +#include <errno.h> +#include <string.h> +#include <assert.h> +#include <endian.h> +#include <unistd.h> +#include <limits.h> +#include <fcntl.h> +#include <inttypes.h> + +#include <sys/ioctl.h> +#include <sys/eventfd.h> +#include <sys/mman.h> + +#include "include/atomic.h" +#include "linux-headers/linux/virtio_ring.h" +#include "linux-headers/linux/virtio_config.h" +#include "linux-headers/linux/vduse.h" +#include "libvduse.h" + +#define VDUSE_VQ_ALIGN 4096 +#define MAX_IOVA_REGIONS 256 + +#define LOG_ALIGNMENT 64 + +/* Round number down to multiple */ +#define ALIGN_DOWN(n, m) ((n) / (m) * (m)) + +/* Round number up to multiple */ +#define ALIGN_UP(n, m) ALIGN_DOWN((n) + (m) - 1, (m)) + +#ifndef unlikely +#define unlikely(x) __builtin_expect(!!(x), 0) +#endif + +typedef struct VduseDescStateSplit { + uint8_t inflight; + uint8_t padding[5]; + uint16_t next; + uint64_t counter; +} VduseDescStateSplit; + +typedef struct VduseVirtqLogInflight { + uint64_t features; + uint16_t version; + uint16_t desc_num; + uint16_t last_batch_head; + uint16_t used_idx; + VduseDescStateSplit desc[]; +} VduseVirtqLogInflight; + +typedef struct VduseVirtqLog { + VduseVirtqLogInflight inflight; +} VduseVirtqLog; + +typedef struct VduseVirtqInflightDesc { + uint16_t index; + uint64_t counter; +} VduseVirtqInflightDesc; + +typedef struct VduseRing { + unsigned int num; + uint64_t desc_addr; + uint64_t avail_addr; + uint64_t used_addr; + struct vring_desc *desc; + struct vring_avail *avail; + struct vring_used *used; +} VduseRing; + +struct VduseVirtq { + VduseRing vring; + uint16_t last_avail_idx; + uint16_t shadow_avail_idx; + uint16_t used_idx; + uint16_t signalled_used; + bool signalled_used_valid; + int index; + int inuse; + bool ready; + int fd; + VduseDev *dev; + VduseVirtqInflightDesc *resubmit_list; + uint16_t resubmit_num; + uint64_t counter; + VduseVirtqLog *log; +}; + +typedef struct VduseIovaRegion { + uint64_t iova; + uint64_t size; + uint64_t mmap_offset; + uint64_t mmap_addr; +} VduseIovaRegion; + +struct VduseDev { + VduseVirtq *vqs; + VduseIovaRegion regions[MAX_IOVA_REGIONS]; + int num_regions; + char *name; + uint32_t device_id; + uint32_t vendor_id; + uint16_t num_queues; + uint16_t queue_size; + uint64_t features; + const VduseOps *ops; + int fd; + int ctrl_fd; + void *priv; + void *log; +}; + +static inline size_t vduse_vq_log_size(uint16_t queue_size) +{ + return ALIGN_UP(sizeof(VduseDescStateSplit) * queue_size + + sizeof(VduseVirtqLogInflight), LOG_ALIGNMENT); +} + +static void *vduse_log_get(const char *filename, size_t size) +{ + void *ptr = MAP_FAILED; + int fd; + + fd = open(filename, O_RDWR | O_CREAT, 0600); + if (fd == -1) { + return MAP_FAILED; + } + + if (ftruncate(fd, size) == -1) { + goto out; + } + + ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + +out: + close(fd); + return ptr; +} + +static inline bool has_feature(uint64_t features, unsigned int fbit) +{ + assert(fbit < 64); + return !!(features & (1ULL << fbit)); +} + +static inline bool vduse_dev_has_feature(VduseDev *dev, unsigned int fbit) +{ + return has_feature(dev->features, fbit); +} + +uint64_t vduse_get_virtio_features(void) +{ + return (1ULL << VIRTIO_F_IOMMU_PLATFORM) | + (1ULL << VIRTIO_F_VERSION_1) | + (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | + (1ULL << VIRTIO_RING_F_EVENT_IDX) | + (1ULL << VIRTIO_RING_F_INDIRECT_DESC); +} + +VduseDev *vduse_queue_get_dev(VduseVirtq *vq) +{ + return vq->dev; +} + +int vduse_queue_get_fd(VduseVirtq *vq) +{ + return vq->fd; +} + +void *vduse_dev_get_priv(VduseDev *dev) +{ + return dev->priv; +} + +VduseVirtq *vduse_dev_get_queue(VduseDev *dev, int index) +{ + return &dev->vqs[index]; +} + +int vduse_dev_get_fd(VduseDev *dev) +{ + return dev->fd; +} + +static int vduse_inject_irq(VduseDev *dev, int index) +{ + return ioctl(dev->fd, VDUSE_VQ_INJECT_IRQ, &index); +} + +static int inflight_desc_compare(const void *a, const void *b) +{ + VduseVirtqInflightDesc *desc0 = (VduseVirtqInflightDesc *)a, + *desc1 = (VduseVirtqInflightDesc *)b; + + if (desc1->counter > desc0->counter && + (desc1->counter - desc0->counter) < VIRTQUEUE_MAX_SIZE * 2) { + return 1; + } + + return -1; +} + +static int vduse_queue_check_inflights(VduseVirtq *vq) +{ + int i = 0; + VduseDev *dev = vq->dev; + + vq->used_idx = le16toh(vq->vring.used->idx); + vq->resubmit_num = 0; + vq->resubmit_list = NULL; + vq->counter = 0; + + if (unlikely(vq->log->inflight.used_idx != vq->used_idx)) { + if (vq->log->inflight.last_batch_head > VIRTQUEUE_MAX_SIZE) { + return -1; + } + + vq->log->inflight.desc[vq->log->inflight.last_batch_head].inflight = 0; + + barrier(); + + vq->log->inflight.used_idx = vq->used_idx; + } + + for (i = 0; i < vq->log->inflight.desc_num; i++) { + if (vq->log->inflight.desc[i].inflight == 1) { + vq->inuse++; + } + } + + vq->shadow_avail_idx = vq->last_avail_idx = vq->inuse + vq->used_idx; + + if (vq->inuse) { + vq->resubmit_list = calloc(vq->inuse, sizeof(VduseVirtqInflightDesc)); + if (!vq->resubmit_list) { + return -1; + } + + for (i = 0; i < vq->log->inflight.desc_num; i++) { + if (vq->log->inflight.desc[i].inflight) { + vq->resubmit_list[vq->resubmit_num].index = i; + vq->resubmit_list[vq->resubmit_num].counter = + vq->log->inflight.desc[i].counter; + vq->resubmit_num++; + } + } + + if (vq->resubmit_num > 1) { + qsort(vq->resubmit_list, vq->resubmit_num, + sizeof(VduseVirtqInflightDesc), inflight_desc_compare); + } + vq->counter = vq->resubmit_list[0].counter + 1; + } + + vduse_inject_irq(dev, vq->index); + + return 0; +} + +static int vduse_queue_inflight_get(VduseVirtq *vq, int desc_idx) +{ + vq->log->inflight.desc[desc_idx].counter = vq->counter++; + + barrier(); + + vq->log->inflight.desc[desc_idx].inflight = 1; + + return 0; +} + +static int vduse_queue_inflight_pre_put(VduseVirtq *vq, int desc_idx) +{ + vq->log->inflight.last_batch_head = desc_idx; + + return 0; +} + +static int vduse_queue_inflight_post_put(VduseVirtq *vq, int desc_idx) +{ + vq->log->inflight.desc[desc_idx].inflight = 0; + + barrier(); + + vq->log->inflight.used_idx = vq->used_idx; + + return 0; +} + +static void vduse_iova_remove_region(VduseDev *dev, uint64_t start, + uint64_t last) +{ + int i; + + if (last == start) { + return; + } + + for (i = 0; i < MAX_IOVA_REGIONS; i++) { + if (!dev->regions[i].mmap_addr) { + continue; + } + + if (start <= dev->regions[i].iova && + last >= (dev->regions[i].iova + dev->regions[i].size - 1)) { + munmap((void *)(uintptr_t)dev->regions[i].mmap_addr, + dev->regions[i].mmap_offset + dev->regions[i].size); + dev->regions[i].mmap_addr = 0; + dev->num_regions--; + } + } +} + +static int vduse_iova_add_region(VduseDev *dev, int fd, + uint64_t offset, uint64_t start, + uint64_t last, int prot) +{ + int i; + uint64_t size = last - start + 1; + void *mmap_addr = mmap(0, size + offset, prot, MAP_SHARED, fd, 0); + + if (mmap_addr == MAP_FAILED) { + close(fd); + return -EINVAL; + } + + for (i = 0; i < MAX_IOVA_REGIONS; i++) { + if (!dev->regions[i].mmap_addr) { + dev->regions[i].mmap_addr = (uint64_t)(uintptr_t)mmap_addr; + dev->regions[i].mmap_offset = offset; + dev->regions[i].iova = start; + dev->regions[i].size = size; + dev->num_regions++; + break; + } + } + assert(i < MAX_IOVA_REGIONS); + close(fd); + + return 0; +} + +static int perm_to_prot(uint8_t perm) +{ + int prot = 0; + + switch (perm) { + case VDUSE_ACCESS_WO: + prot |= PROT_WRITE; + break; + case VDUSE_ACCESS_RO: + prot |= PROT_READ; + break; + case VDUSE_ACCESS_RW: + prot |= PROT_READ | PROT_WRITE; + break; + default: + break; + } + + return prot; +} + +static inline void *iova_to_va(VduseDev *dev, uint64_t *plen, uint64_t iova) +{ + int i, ret; + struct vduse_iotlb_entry entry; + + for (i = 0; i < MAX_IOVA_REGIONS; i++) { + VduseIovaRegion *r = &dev->regions[i]; + + if (!r->mmap_addr) { + continue; + } + + if ((iova >= r->iova) && (iova < (r->iova + r->size))) { + if ((iova + *plen) > (r->iova + r->size)) { + *plen = r->iova + r->size - iova; + } + return (void *)(uintptr_t)(iova - r->iova + + r->mmap_addr + r->mmap_offset); + } + } + + entry.start = iova; + entry.last = iova + 1; + ret = ioctl(dev->fd, VDUSE_IOTLB_GET_FD, &entry); + if (ret < 0) { + return NULL; + } + + if (!vduse_iova_add_region(dev, ret, entry.offset, entry.start, + entry.last, perm_to_prot(entry.perm))) { + return iova_to_va(dev, plen, iova); + } + + return NULL; +} + +static inline uint16_t vring_avail_flags(VduseVirtq *vq) +{ + return le16toh(vq->vring.avail->flags); +} + +static inline uint16_t vring_avail_idx(VduseVirtq *vq) +{ + vq->shadow_avail_idx = le16toh(vq->vring.avail->idx); + + return vq->shadow_avail_idx; +} + +static inline uint16_t vring_avail_ring(VduseVirtq *vq, int i) +{ + return le16toh(vq->vring.avail->ring[i]); +} + +static inline uint16_t vring_get_used_event(VduseVirtq *vq) +{ + return vring_avail_ring(vq, vq->vring.num); +} + +static bool vduse_queue_get_head(VduseVirtq *vq, unsigned int idx, + unsigned int *head) +{ + /* + * Grab the next descriptor number they're advertising, and increment + * the index we've seen. + */ + *head = vring_avail_ring(vq, idx % vq->vring.num); + + /* If their number is silly, that's a fatal mistake. */ + if (*head >= vq->vring.num) { + fprintf(stderr, "Guest says index %u is available\n", *head); + return false; + } + + return true; +} + +static int +vduse_queue_read_indirect_desc(VduseDev *dev, struct vring_desc *desc, + uint64_t addr, size_t len) +{ + struct vring_desc *ori_desc; + uint64_t read_len; + + if (len > (VIRTQUEUE_MAX_SIZE * sizeof(struct vring_desc))) { + return -1; + } + + if (len == 0) { + return -1; + } + + while (len) { + read_len = len; + ori_desc = iova_to_va(dev, &read_len, addr); + if (!ori_desc) { + return -1; + } + + memcpy(desc, ori_desc, read_len); + len -= read_len; + addr += read_len; + desc += read_len; + } + + return 0; +} + +enum { + VIRTQUEUE_READ_DESC_ERROR = -1, + VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */ + VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */ +}; + +static int vduse_queue_read_next_desc(struct vring_desc *desc, int i, + unsigned int max, unsigned int *next) +{ + /* If this descriptor says it doesn't chain, we're done. */ + if (!(le16toh(desc[i].flags) & VRING_DESC_F_NEXT)) { + return VIRTQUEUE_READ_DESC_DONE; + } + + /* Check they're not leading us off end of descriptors. */ + *next = desc[i].next; + /* Make sure compiler knows to grab that: we don't want it changing! */ + smp_wmb(); + + if (*next >= max) { + fprintf(stderr, "Desc next is %u\n", *next); + return VIRTQUEUE_READ_DESC_ERROR; + } + + return VIRTQUEUE_READ_DESC_MORE; +} + +/* + * Fetch avail_idx from VQ memory only when we really need to know if + * guest has added some buffers. + */ +static bool vduse_queue_empty(VduseVirtq *vq) +{ + if (unlikely(!vq->vring.avail)) { + return true; + } + + if (vq->shadow_avail_idx != vq->last_avail_idx) { + return false; + } + + return vring_avail_idx(vq) == vq->last_avail_idx; +} + +static bool vduse_queue_should_notify(VduseVirtq *vq) +{ + VduseDev *dev = vq->dev; + uint16_t old, new; + bool v; + + /* We need to expose used array entries before checking used event. */ + smp_mb(); + + /* Always notify when queue is empty (when feature acknowledge) */ + if (vduse_dev_has_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY) && + !vq->inuse && vduse_queue_empty(vq)) { + return true; + } + + if (!vduse_dev_has_feature(dev, VIRTIO_RING_F_EVENT_IDX)) { + return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); + } + + v = vq->signalled_used_valid; + vq->signalled_used_valid = true; + old = vq->signalled_used; + new = vq->signalled_used = vq->used_idx; + return !v || vring_need_event(vring_get_used_event(vq), new, old); +} + +void vduse_queue_notify(VduseVirtq *vq) +{ + VduseDev *dev = vq->dev; + + if (unlikely(!vq->vring.avail)) { + return; + } + + if (!vduse_queue_should_notify(vq)) { + return; + } + + if (vduse_inject_irq(dev, vq->index) < 0) { + fprintf(stderr, "Error inject irq for vq %d: %s\n", + vq->index, strerror(errno)); + } +} + +static inline void vring_set_avail_event(VduseVirtq *vq, uint16_t val) +{ + *((uint16_t *)&vq->vring.used->ring[vq->vring.num]) = htole16(val); +} + +static bool vduse_queue_map_single_desc(VduseVirtq *vq, unsigned int *p_num_sg, + struct iovec *iov, unsigned int max_num_sg, + bool is_write, uint64_t pa, size_t sz) +{ + unsigned num_sg = *p_num_sg; + VduseDev *dev = vq->dev; + + assert(num_sg <= max_num_sg); + + if (!sz) { + fprintf(stderr, "virtio: zero sized buffers are not allowed\n"); + return false; + } + + while (sz) { + uint64_t len = sz; + + if (num_sg == max_num_sg) { + fprintf(stderr, + "virtio: too many descriptors in indirect table\n"); + return false; + } + + iov[num_sg].iov_base = iova_to_va(dev, &len, pa); + if (iov[num_sg].iov_base == NULL) { + fprintf(stderr, "virtio: invalid address for buffers\n"); + return false; + } + iov[num_sg++].iov_len = len; + sz -= len; + pa += len; + } + + *p_num_sg = num_sg; + return true; +} + +static void *vduse_queue_alloc_element(size_t sz, unsigned out_num, + unsigned in_num) +{ + VduseVirtqElement *elem; + size_t in_sg_ofs = ALIGN_UP(sz, __alignof__(elem->in_sg[0])); + size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); + size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); + + assert(sz >= sizeof(VduseVirtqElement)); + elem = malloc(out_sg_end); + if (!elem) { + return NULL; + } + elem->out_num = out_num; + elem->in_num = in_num; + elem->in_sg = (void *)elem + in_sg_ofs; + elem->out_sg = (void *)elem + out_sg_ofs; + return elem; +} + +static void *vduse_queue_map_desc(VduseVirtq *vq, unsigned int idx, size_t sz) +{ + struct vring_desc *desc = vq->vring.desc; + VduseDev *dev = vq->dev; + uint64_t desc_addr, read_len; + unsigned int desc_len; + unsigned int max = vq->vring.num; + unsigned int i = idx; + VduseVirtqElement *elem; + struct iovec iov[VIRTQUEUE_MAX_SIZE]; + struct vring_desc desc_buf[VIRTQUEUE_MAX_SIZE]; + unsigned int out_num = 0, in_num = 0; + int rc; + + if (le16toh(desc[i].flags) & VRING_DESC_F_INDIRECT) { + if (le32toh(desc[i].len) % sizeof(struct vring_desc)) { + fprintf(stderr, "Invalid size for indirect buffer table\n"); + return NULL; + } + + /* loop over the indirect descriptor table */ + desc_addr = le64toh(desc[i].addr); + desc_len = le32toh(desc[i].len); + max = desc_len / sizeof(struct vring_desc); + read_len = desc_len; + desc = iova_to_va(dev, &read_len, desc_addr); + if (unlikely(desc && read_len != desc_len)) { + /* Failed to use zero copy */ + desc = NULL; + if (!vduse_queue_read_indirect_desc(dev, desc_buf, + desc_addr, + desc_len)) { + desc = desc_buf; + } + } + if (!desc) { + fprintf(stderr, "Invalid indirect buffer table\n"); + return NULL; + } + i = 0; + } + + /* Collect all the descriptors */ + do { + if (le16toh(desc[i].flags) & VRING_DESC_F_WRITE) { + if (!vduse_queue_map_single_desc(vq, &in_num, iov + out_num, + VIRTQUEUE_MAX_SIZE - out_num, + true, le64toh(desc[i].addr), + le32toh(desc[i].len))) { + return NULL; + } + } else { + if (in_num) { + fprintf(stderr, "Incorrect order for descriptors\n"); + return NULL; + } + if (!vduse_queue_map_single_desc(vq, &out_num, iov, + VIRTQUEUE_MAX_SIZE, false, + le64toh(desc[i].addr), + le32toh(desc[i].len))) { + return NULL; + } + } + + /* If we've got too many, that implies a descriptor loop. */ + if ((in_num + out_num) > max) { + fprintf(stderr, "Looped descriptor\n"); + return NULL; + } + rc = vduse_queue_read_next_desc(desc, i, max, &i); + } while (rc == VIRTQUEUE_READ_DESC_MORE); + + if (rc == VIRTQUEUE_READ_DESC_ERROR) { + fprintf(stderr, "read descriptor error\n"); + return NULL; + } + + /* Now copy what we have collected and mapped */ + elem = vduse_queue_alloc_element(sz, out_num, in_num); + if (!elem) { + fprintf(stderr, "read descriptor error\n"); + return NULL; + } + elem->index = idx; + for (i = 0; i < out_num; i++) { + elem->out_sg[i] = iov[i]; + } + for (i = 0; i < in_num; i++) { + elem->in_sg[i] = iov[out_num + i]; + } + + return elem; +} + +void *vduse_queue_pop(VduseVirtq *vq, size_t sz) +{ + unsigned int head; + VduseVirtqElement *elem; + VduseDev *dev = vq->dev; + int i; + + if (unlikely(!vq->vring.avail)) { + return NULL; + } + + if (unlikely(vq->resubmit_list && vq->resubmit_num > 0)) { + i = (--vq->resubmit_num); + elem = vduse_queue_map_desc(vq, vq->resubmit_list[i].index, sz); + + if (!vq->resubmit_num) { + free(vq->resubmit_list); + vq->resubmit_list = NULL; + } + + return elem; + } + + if (vduse_queue_empty(vq)) { + return NULL; + } + /* Needed after virtio_queue_empty() */ + smp_rmb(); + + if (vq->inuse >= vq->vring.num) { + fprintf(stderr, "Virtqueue size exceeded: %d\n", vq->inuse); + return NULL; + } + + if (!vduse_queue_get_head(vq, vq->last_avail_idx++, &head)) { + return NULL; + } + + if (vduse_dev_has_feature(dev, VIRTIO_RING_F_EVENT_IDX)) { + vring_set_avail_event(vq, vq->last_avail_idx); + } + + elem = vduse_queue_map_desc(vq, head, sz); + + if (!elem) { + return NULL; + } + + vq->inuse++; + + vduse_queue_inflight_get(vq, head); + + return elem; +} + +static inline void vring_used_write(VduseVirtq *vq, + struct vring_used_elem *uelem, int i) +{ + struct vring_used *used = vq->vring.used; + + used->ring[i] = *uelem; +} + +static void vduse_queue_fill(VduseVirtq *vq, const VduseVirtqElement *elem, + unsigned int len, unsigned int idx) +{ + struct vring_used_elem uelem; + + if (unlikely(!vq->vring.used)) { + return; + } + + idx = (idx + vq->used_idx) % vq->vring.num; + + uelem.id = htole32(elem->index); + uelem.len = htole32(len); + vring_used_write(vq, &uelem, idx); +} + +static inline void vring_used_idx_set(VduseVirtq *vq, uint16_t val) +{ + vq->vring.used->idx = htole16(val); + vq->used_idx = val; +} + +static void vduse_queue_flush(VduseVirtq *vq, unsigned int count) +{ + uint16_t old, new; + + if (unlikely(!vq->vring.used)) { + return; + } + + /* Make sure buffer is written before we update index. */ + smp_wmb(); + + old = vq->used_idx; + new = old + count; + vring_used_idx_set(vq, new); + vq->inuse -= count; + if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) { + vq->signalled_used_valid = false; + } +} + +void vduse_queue_push(VduseVirtq *vq, const VduseVirtqElement *elem, + unsigned int len) +{ + vduse_queue_fill(vq, elem, len, 0); + vduse_queue_inflight_pre_put(vq, elem->index); + vduse_queue_flush(vq, 1); + vduse_queue_inflight_post_put(vq, elem->index); +} + +static int vduse_queue_update_vring(VduseVirtq *vq, uint64_t desc_addr, + uint64_t avail_addr, uint64_t used_addr) +{ + struct VduseDev *dev = vq->dev; + uint64_t len; + + len = sizeof(struct vring_desc); + vq->vring.desc = iova_to_va(dev, &len, desc_addr); + if (len != sizeof(struct vring_desc)) { + return -EINVAL; + } + + len = sizeof(struct vring_avail); + vq->vring.avail = iova_to_va(dev, &len, avail_addr); + if (len != sizeof(struct vring_avail)) { + return -EINVAL; + } + + len = sizeof(struct vring_used); + vq->vring.used = iova_to_va(dev, &len, used_addr); + if (len != sizeof(struct vring_used)) { + return -EINVAL; + } + + if (!vq->vring.desc || !vq->vring.avail || !vq->vring.used) { + fprintf(stderr, "Failed to get vq[%d] iova mapping\n", vq->index); + return -EINVAL; + } + + return 0; +} + +static void vduse_queue_enable(VduseVirtq *vq) +{ + struct VduseDev *dev = vq->dev; + struct vduse_vq_info vq_info; + struct vduse_vq_eventfd vq_eventfd; + int fd; + + vq_info.index = vq->index; + if (ioctl(dev->fd, VDUSE_VQ_GET_INFO, &vq_info)) { + fprintf(stderr, "Failed to get vq[%d] info: %s\n", + vq->index, strerror(errno)); + return; + } + + if (!vq_info.ready) { + return; + } + + vq->vring.num = vq_info.num; + vq->vring.desc_addr = vq_info.desc_addr; + vq->vring.avail_addr = vq_info.driver_addr; + vq->vring.used_addr = vq_info.device_addr; + + if (vduse_queue_update_vring(vq, vq_info.desc_addr, + vq_info.driver_addr, vq_info.device_addr)) { + fprintf(stderr, "Failed to update vring for vq[%d]\n", vq->index); + return; + } + + fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); + if (fd < 0) { + fprintf(stderr, "Failed to init eventfd for vq[%d]\n", vq->index); + return; + } + + vq_eventfd.index = vq->index; + vq_eventfd.fd = fd; + if (ioctl(dev->fd, VDUSE_VQ_SETUP_KICKFD, &vq_eventfd)) { + fprintf(stderr, "Failed to setup kick fd for vq[%d]\n", vq->index); + close(fd); + return; + } + + vq->fd = fd; + vq->signalled_used_valid = false; + vq->ready = true; + + if (vduse_queue_check_inflights(vq)) { + fprintf(stderr, "Failed to check inflights for vq[%d]\n", vq->index); + close(fd); + return; + } + + dev->ops->enable_queue(dev, vq); +} + +static void vduse_queue_disable(VduseVirtq *vq) +{ + struct VduseDev *dev = vq->dev; + struct vduse_vq_eventfd eventfd; + + if (!vq->ready) { + return; + } + + dev->ops->disable_queue(dev, vq); + + eventfd.index = vq->index; + eventfd.fd = VDUSE_EVENTFD_DEASSIGN; + ioctl(dev->fd, VDUSE_VQ_SETUP_KICKFD, &eventfd); + close(vq->fd); + + assert(vq->inuse == 0); + + vq->vring.num = 0; + vq->vring.desc_addr = 0; + vq->vring.avail_addr = 0; + vq->vring.used_addr = 0; + vq->vring.desc = 0; + vq->vring.avail = 0; + vq->vring.used = 0; + vq->ready = false; + vq->fd = -1; +} + +static void vduse_dev_start_dataplane(VduseDev *dev) +{ + int i; + + if (ioctl(dev->fd, VDUSE_DEV_GET_FEATURES, &dev->features)) { + fprintf(stderr, "Failed to get features: %s\n", strerror(errno)); + return; + } + assert(vduse_dev_has_feature(dev, VIRTIO_F_VERSION_1)); + + for (i = 0; i < dev->num_queues; i++) { + vduse_queue_enable(&dev->vqs[i]); + } +} + +static void vduse_dev_stop_dataplane(VduseDev *dev) +{ + size_t log_size = dev->num_queues * vduse_vq_log_size(VIRTQUEUE_MAX_SIZE); + int i; + + for (i = 0; i < dev->num_queues; i++) { + vduse_queue_disable(&dev->vqs[i]); + } + if (dev->log) { + memset(dev->log, 0, log_size); + } + dev->features = 0; + vduse_iova_remove_region(dev, 0, ULONG_MAX); +} + +int vduse_dev_handler(VduseDev *dev) +{ + struct vduse_dev_request req; + struct vduse_dev_response resp = { 0 }; + VduseVirtq *vq; + int i, ret; + + ret = read(dev->fd, &req, sizeof(req)); + if (ret != sizeof(req)) { + fprintf(stderr, "Read request error [%d]: %s\n", + ret, strerror(errno)); + return -errno; + } + resp.request_id = req.request_id; + + switch (req.type) { + case VDUSE_GET_VQ_STATE: + vq = &dev->vqs[req.vq_state.index]; + resp.vq_state.split.avail_index = vq->last_avail_idx; + resp.result = VDUSE_REQ_RESULT_OK; + break; + case VDUSE_SET_STATUS: + if (req.s.status & VIRTIO_CONFIG_S_DRIVER_OK) { + vduse_dev_start_dataplane(dev); + } else if (req.s.status == 0) { + vduse_dev_stop_dataplane(dev); + } + resp.result = VDUSE_REQ_RESULT_OK; + break; + case VDUSE_UPDATE_IOTLB: + /* The iova will be updated by iova_to_va() later, so just remove it */ + vduse_iova_remove_region(dev, req.iova.start, req.iova.last); + for (i = 0; i < dev->num_queues; i++) { + VduseVirtq *vq = &dev->vqs[i]; + if (vq->ready) { + if (vduse_queue_update_vring(vq, vq->vring.desc_addr, + vq->vring.avail_addr, + vq->vring.used_addr)) { + fprintf(stderr, "Failed to update vring for vq[%d]\n", + vq->index); + } + } + } + resp.result = VDUSE_REQ_RESULT_OK; + break; + default: + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } + + ret = write(dev->fd, &resp, sizeof(resp)); + if (ret != sizeof(resp)) { + fprintf(stderr, "Write request %d error [%d]: %s\n", + req.type, ret, strerror(errno)); + return -errno; + } + return 0; +} + +int vduse_dev_update_config(VduseDev *dev, uint32_t size, + uint32_t offset, char *buffer) +{ + int ret; + struct vduse_config_data *data; + + data = malloc(offsetof(struct vduse_config_data, buffer) + size); + if (!data) { + return -ENOMEM; + } + + data->offset = offset; + data->length = size; + memcpy(data->buffer, buffer, size); + + ret = ioctl(dev->fd, VDUSE_DEV_SET_CONFIG, data); + free(data); + + if (ret) { + return -errno; + } + + if (ioctl(dev->fd, VDUSE_DEV_INJECT_CONFIG_IRQ)) { + return -errno; + } + + return 0; +} + +int vduse_dev_setup_queue(VduseDev *dev, int index, int max_size) +{ + VduseVirtq *vq = &dev->vqs[index]; + struct vduse_vq_config vq_config = { 0 }; + + if (max_size > VIRTQUEUE_MAX_SIZE) { + return -EINVAL; + } + + vq_config.index = vq->index; + vq_config.max_size = max_size; + + if (ioctl(dev->fd, VDUSE_VQ_SETUP, &vq_config)) { + return -errno; + } + + vduse_queue_enable(vq); + + return 0; +} + +int vduse_set_reconnect_log_file(VduseDev *dev, const char *filename) +{ + + size_t log_size = dev->num_queues * vduse_vq_log_size(VIRTQUEUE_MAX_SIZE); + void *log; + int i; + + dev->log = log = vduse_log_get(filename, log_size); + if (log == MAP_FAILED) { + fprintf(stderr, "Failed to get vduse log\n"); + return -EINVAL; + } + + for (i = 0; i < dev->num_queues; i++) { + dev->vqs[i].log = log; + dev->vqs[i].log->inflight.desc_num = VIRTQUEUE_MAX_SIZE; + log = (void *)((char *)log + vduse_vq_log_size(VIRTQUEUE_MAX_SIZE)); + } + + return 0; +} + +static int vduse_dev_init_vqs(VduseDev *dev, uint16_t num_queues) +{ + VduseVirtq *vqs; + int i; + + vqs = calloc(sizeof(VduseVirtq), num_queues); + if (!vqs) { + return -ENOMEM; + } + + for (i = 0; i < num_queues; i++) { + vqs[i].index = i; + vqs[i].dev = dev; + vqs[i].fd = -1; + } + dev->vqs = vqs; + + return 0; +} + +static int vduse_dev_init(VduseDev *dev, const char *name, + uint16_t num_queues, const VduseOps *ops, + void *priv) +{ + char *dev_path, *dev_name; + int ret, fd; + + dev_path = malloc(strlen(name) + strlen("/dev/vduse/") + 1); + if (!dev_path) { + return -ENOMEM; + } + sprintf(dev_path, "/dev/vduse/%s", name); + + fd = open(dev_path, O_RDWR); + free(dev_path); + if (fd < 0) { + fprintf(stderr, "Failed to open vduse dev %s: %s\n", + name, strerror(errno)); + return -errno; + } + + if (ioctl(fd, VDUSE_DEV_GET_FEATURES, &dev->features)) { + fprintf(stderr, "Failed to get features: %s\n", strerror(errno)); + close(fd); + return -errno; + } + + dev_name = strdup(name); + if (!dev_name) { + close(fd); + return -ENOMEM; + } + + ret = vduse_dev_init_vqs(dev, num_queues); + if (ret) { + free(dev_name); + close(fd); + return ret; + } + + dev->name = dev_name; + dev->num_queues = num_queues; + dev->fd = fd; + dev->ops = ops; + dev->priv = priv; + + return 0; +} + +static inline bool vduse_name_is_valid(const char *name) +{ + return strlen(name) >= VDUSE_NAME_MAX || strstr(name, ".."); +} + +VduseDev *vduse_dev_create_by_fd(int fd, uint16_t num_queues, + const VduseOps *ops, void *priv) +{ + VduseDev *dev; + int ret; + + if (!ops || !ops->enable_queue || !ops->disable_queue) { + fprintf(stderr, "Invalid parameter for vduse\n"); + return NULL; + } + + dev = calloc(sizeof(VduseDev), 1); + if (!dev) { + fprintf(stderr, "Failed to allocate vduse device\n"); + return NULL; + } + + if (ioctl(fd, VDUSE_DEV_GET_FEATURES, &dev->features)) { + fprintf(stderr, "Failed to get features: %s\n", strerror(errno)); + free(dev); + return NULL; + } + + ret = vduse_dev_init_vqs(dev, num_queues); + if (ret) { + fprintf(stderr, "Failed to init vqs\n"); + free(dev); + return NULL; + } + + dev->num_queues = num_queues; + dev->fd = fd; + dev->ops = ops; + dev->priv = priv; + + return dev; +} + +VduseDev *vduse_dev_create_by_name(const char *name, uint16_t num_queues, + const VduseOps *ops, void *priv) +{ + VduseDev *dev; + int ret; + + if (!name || vduse_name_is_valid(name) || !ops || + !ops->enable_queue || !ops->disable_queue) { + fprintf(stderr, "Invalid parameter for vduse\n"); + return NULL; + } + + dev = calloc(sizeof(VduseDev), 1); + if (!dev) { + fprintf(stderr, "Failed to allocate vduse device\n"); + return NULL; + } + + ret = vduse_dev_init(dev, name, num_queues, ops, priv); + if (ret < 0) { + fprintf(stderr, "Failed to init vduse device %s: %s\n", + name, strerror(ret)); + free(dev); + return NULL; + } + + return dev; +} + +VduseDev *vduse_dev_create(const char *name, uint32_t device_id, + uint32_t vendor_id, uint64_t features, + uint16_t num_queues, uint32_t config_size, + char *config, const VduseOps *ops, void *priv) +{ + VduseDev *dev; + int ret, ctrl_fd; + uint64_t version; + struct vduse_dev_config *dev_config; + size_t size = offsetof(struct vduse_dev_config, config); + + if (!name || vduse_name_is_valid(name) || + !has_feature(features, VIRTIO_F_VERSION_1) || !config || + !config_size || !ops || !ops->enable_queue || !ops->disable_queue) { + fprintf(stderr, "Invalid parameter for vduse\n"); + return NULL; + } + + dev = calloc(sizeof(VduseDev), 1); + if (!dev) { + fprintf(stderr, "Failed to allocate vduse device\n"); + return NULL; + } + + ctrl_fd = open("/dev/vduse/control", O_RDWR); + if (ctrl_fd < 0) { + fprintf(stderr, "Failed to open /dev/vduse/control: %s\n", + strerror(errno)); + goto err_ctrl; + } + + version = VDUSE_API_VERSION; + if (ioctl(ctrl_fd, VDUSE_SET_API_VERSION, &version)) { + fprintf(stderr, "Failed to set api version %" PRIu64 ": %s\n", + version, strerror(errno)); + goto err_dev; + } + + dev_config = calloc(size + config_size, 1); + if (!dev_config) { + fprintf(stderr, "Failed to allocate config space\n"); + goto err_dev; + } + + strcpy(dev_config->name, name); + dev_config->device_id = device_id; + dev_config->vendor_id = vendor_id; + dev_config->features = features; + dev_config->vq_num = num_queues; + dev_config->vq_align = VDUSE_VQ_ALIGN; + dev_config->config_size = config_size; + memcpy(dev_config->config, config, config_size); + + ret = ioctl(ctrl_fd, VDUSE_CREATE_DEV, dev_config); + free(dev_config); + if (ret && errno != EEXIST) { + fprintf(stderr, "Failed to create vduse device %s: %s\n", + name, strerror(errno)); + goto err_dev; + } + dev->ctrl_fd = ctrl_fd; + + ret = vduse_dev_init(dev, name, num_queues, ops, priv); + if (ret < 0) { + fprintf(stderr, "Failed to init vduse device %s: %s\n", + name, strerror(ret)); + goto err; + } + + return dev; +err: + ioctl(ctrl_fd, VDUSE_DESTROY_DEV, name); +err_dev: + close(ctrl_fd); +err_ctrl: + free(dev); + + return NULL; +} + +int vduse_dev_destroy(VduseDev *dev) +{ + size_t log_size = dev->num_queues * vduse_vq_log_size(VIRTQUEUE_MAX_SIZE); + int i, ret = 0; + + if (dev->log) { + munmap(dev->log, log_size); + } + for (i = 0; i < dev->num_queues; i++) { + free(dev->vqs[i].resubmit_list); + } + free(dev->vqs); + if (dev->fd >= 0) { + close(dev->fd); + dev->fd = -1; + } + if (dev->ctrl_fd >= 0) { + if (ioctl(dev->ctrl_fd, VDUSE_DESTROY_DEV, dev->name)) { + ret = -errno; + } + close(dev->ctrl_fd); + dev->ctrl_fd = -1; + } + free(dev->name); + free(dev); + + return ret; +} diff --git a/subprojects/libvduse/libvduse.h b/subprojects/libvduse/libvduse.h new file mode 100644 index 0000000000..32f19e7b48 --- /dev/null +++ b/subprojects/libvduse/libvduse.h @@ -0,0 +1,247 @@ +/* + * VDUSE (vDPA Device in Userspace) library + * + * Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved. + * + * Author: + * Xie Yongji <xieyongji@bytedance.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. + */ + +#ifndef LIBVDUSE_H +#define LIBVDUSE_H + +#include <stdint.h> +#include <sys/uio.h> + +#define VIRTQUEUE_MAX_SIZE 1024 + +/* VDUSE device structure */ +typedef struct VduseDev VduseDev; + +/* Virtqueue structure */ +typedef struct VduseVirtq VduseVirtq; + +/* Some operation of VDUSE backend */ +typedef struct VduseOps { + /* Called when virtqueue can be processed */ + void (*enable_queue)(VduseDev *dev, VduseVirtq *vq); + /* Called when virtqueue processing should be stopped */ + void (*disable_queue)(VduseDev *dev, VduseVirtq *vq); +} VduseOps; + +/* Describing elements of the I/O buffer */ +typedef struct VduseVirtqElement { + /* Descriptor table index */ + unsigned int index; + /* Number of physically-contiguous device-readable descriptors */ + unsigned int out_num; + /* Number of physically-contiguous device-writable descriptors */ + unsigned int in_num; + /* Array to store physically-contiguous device-writable descriptors */ + struct iovec *in_sg; + /* Array to store physically-contiguous device-readable descriptors */ + struct iovec *out_sg; +} VduseVirtqElement; + + +/** + * vduse_get_virtio_features: + * + * Get supported virtio features + * + * Returns: supported feature bits + */ +uint64_t vduse_get_virtio_features(void); + +/** + * vduse_queue_get_dev: + * @vq: specified virtqueue + * + * Get corresponding VDUSE device from the virtqueue. + * + * Returns: a pointer to VDUSE device on success, NULL on failure. + */ +VduseDev *vduse_queue_get_dev(VduseVirtq *vq); + +/** + * vduse_queue_get_fd: + * @vq: specified virtqueue + * + * Get the kick fd for the virtqueue. + * + * Returns: file descriptor on success, -1 on failure. + */ +int vduse_queue_get_fd(VduseVirtq *vq); + +/** + * vduse_queue_pop: + * @vq: specified virtqueue + * @sz: the size of struct to return (must be >= VduseVirtqElement) + * + * Pop an element from virtqueue available ring. + * + * Returns: a pointer to a structure containing VduseVirtqElement on success, + * NULL on failure. + */ +void *vduse_queue_pop(VduseVirtq *vq, size_t sz); + +/** + * vduse_queue_push: + * @vq: specified virtqueue + * @elem: pointer to VduseVirtqElement returned by vduse_queue_pop() + * @len: length in bytes to write + * + * Push an element to virtqueue used ring. + */ +void vduse_queue_push(VduseVirtq *vq, const VduseVirtqElement *elem, + unsigned int len); +/** + * vduse_queue_notify: + * @vq: specified virtqueue + * + * Request to notify the queue. + */ +void vduse_queue_notify(VduseVirtq *vq); + +/** + * vduse_dev_get_priv: + * @dev: VDUSE device + * + * Get the private pointer passed to vduse_dev_create(). + * + * Returns: private pointer on success, NULL on failure. + */ +void *vduse_dev_get_priv(VduseDev *dev); + +/** + * vduse_dev_get_queue: + * @dev: VDUSE device + * @index: virtqueue index + * + * Get the specified virtqueue. + * + * Returns: a pointer to the virtqueue on success, NULL on failure. + */ +VduseVirtq *vduse_dev_get_queue(VduseDev *dev, int index); + +/** + * vduse_dev_get_fd: + * @dev: VDUSE device + * + * Get the control message fd for the VDUSE device. + * + * Returns: file descriptor on success, -1 on failure. + */ +int vduse_dev_get_fd(VduseDev *dev); + +/** + * vduse_dev_handler: + * @dev: VDUSE device + * + * Used to process the control message. + * + * Returns: file descriptor on success, -errno on failure. + */ +int vduse_dev_handler(VduseDev *dev); + +/** + * vduse_dev_update_config: + * @dev: VDUSE device + * @size: the size to write to configuration space + * @offset: the offset from the beginning of configuration space + * @buffer: the buffer used to write from + * + * Update device configuration space and inject a config interrupt. + * + * Returns: 0 on success, -errno on failure. + */ +int vduse_dev_update_config(VduseDev *dev, uint32_t size, + uint32_t offset, char *buffer); + +/** + * vduse_dev_setup_queue: + * @dev: VDUSE device + * @index: virtqueue index + * @max_size: the max size of virtqueue + * + * Setup the specified virtqueue. + * + * Returns: 0 on success, -errno on failure. + */ +int vduse_dev_setup_queue(VduseDev *dev, int index, int max_size); + +/** + * vduse_set_reconnect_log_file: + * @dev: VDUSE device + * @file: filename of reconnect log + * + * Specify the file to store log for reconnecting. It should + * be called before vduse_dev_setup_queue(). + * + * Returns: 0 on success, -errno on failure. + */ +int vduse_set_reconnect_log_file(VduseDev *dev, const char *filename); + +/** + * vduse_dev_create_by_fd: + * @fd: passed file descriptor + * @num_queues: the number of virtqueues + * @ops: the operation of VDUSE backend + * @priv: private pointer + * + * Create VDUSE device from a passed file descriptor. + * + * Returns: pointer to VDUSE device on success, NULL on failure. + */ +VduseDev *vduse_dev_create_by_fd(int fd, uint16_t num_queues, + const VduseOps *ops, void *priv); + +/** + * vduse_dev_create_by_name: + * @name: VDUSE device name + * @num_queues: the number of virtqueues + * @ops: the operation of VDUSE backend + * @priv: private pointer + * + * Create VDUSE device on /dev/vduse/$NAME. + * + * Returns: pointer to VDUSE device on success, NULL on failure. + */ +VduseDev *vduse_dev_create_by_name(const char *name, uint16_t num_queues, + const VduseOps *ops, void *priv); + +/** + * vduse_dev_create: + * @name: VDUSE device name + * @device_id: virtio device id + * @vendor_id: virtio vendor id + * @features: virtio features + * @num_queues: the number of virtqueues + * @config_size: the size of the configuration space + * @config: the buffer of the configuration space + * @ops: the operation of VDUSE backend + * @priv: private pointer + * + * Create VDUSE device. + * + * Returns: pointer to VDUSE device on success, NULL on failure. + */ +VduseDev *vduse_dev_create(const char *name, uint32_t device_id, + uint32_t vendor_id, uint64_t features, + uint16_t num_queues, uint32_t config_size, + char *config, const VduseOps *ops, void *priv); + +/** + * vduse_dev_destroy: + * @dev: VDUSE device + * + * Destroy the VDUSE device. + * + * Returns: 0 on success, -errno on failure. + */ +int vduse_dev_destroy(VduseDev *dev); + +#endif diff --git a/subprojects/libvduse/linux-headers/linux b/subprojects/libvduse/linux-headers/linux new file mode 120000 index 0000000000..04f3304f79 --- /dev/null +++ b/subprojects/libvduse/linux-headers/linux @@ -0,0 +1 @@ +../../../linux-headers/linux/ \ No newline at end of file diff --git a/subprojects/libvduse/meson.build b/subprojects/libvduse/meson.build new file mode 100644 index 0000000000..ba08f5ee1a --- /dev/null +++ b/subprojects/libvduse/meson.build @@ -0,0 +1,10 @@ +project('libvduse', 'c', + license: 'GPL-2.0-or-later', + default_options: ['c_std=gnu99']) + +libvduse = static_library('vduse', + files('libvduse.c'), + c_args: '-D_GNU_SOURCE') + +libvduse_dep = declare_dependency(link_with: libvduse, + include_directories: include_directories('.')) diff --git a/subprojects/libvduse/standard-headers/linux b/subprojects/libvduse/standard-headers/linux new file mode 120000 index 0000000000..c416f068ac --- /dev/null +++ b/subprojects/libvduse/standard-headers/linux @@ -0,0 +1 @@ +../../../include/standard-headers/linux/ \ No newline at end of file diff --git a/util/aio-wait.c b/util/aio-wait.c index bdb3d3af22..98c5accd29 100644 --- a/util/aio-wait.c +++ b/util/aio-wait.c @@ -35,7 +35,21 @@ static void dummy_bh_cb(void *opaque) void aio_wait_kick(void) { - /* The barrier (or an atomic op) is in the caller. */ + /* + * Paired with smp_mb in AIO_WAIT_WHILE. Here we have: + * write(condition); + * aio_wait_kick() { + * smp_mb(); + * read(num_waiters); + * } + * + * And in AIO_WAIT_WHILE: + * write(num_waiters); + * smp_mb(); + * read(condition); + */ + smp_mb(); + if (qatomic_read(&global_aio_wait.num_waiters)) { aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL); } diff --git a/util/hbitmap.c b/util/hbitmap.c index ea989e1f0e..297db35fb1 100644 --- a/util/hbitmap.c +++ b/util/hbitmap.c @@ -873,11 +873,6 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size) } } -bool hbitmap_can_merge(const HBitmap *a, const HBitmap *b) -{ - return (a->orig_size == b->orig_size); -} - /** * hbitmap_sparse_merge: performs dst = dst | src * works with differing granularities. @@ -901,28 +896,24 @@ static void hbitmap_sparse_merge(HBitmap *dst, const HBitmap *src) * Given HBitmaps A and B, let R := A (BITOR) B. * Bitmaps A and B will not be modified, * except when bitmap R is an alias of A or B. - * - * @return true if the merge was successful, - * false if it was not attempted. + * Bitmaps must have same size. */ -bool hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result) +void hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result) { int i; uint64_t j; - if (!hbitmap_can_merge(a, b) || !hbitmap_can_merge(a, result)) { - return false; - } - assert(hbitmap_can_merge(b, result)); + assert(a->orig_size == result->orig_size); + assert(b->orig_size == result->orig_size); if ((!hbitmap_count(a) && result == b) || (!hbitmap_count(b) && result == a)) { - return true; + return; } if (!hbitmap_count(a) && !hbitmap_count(b)) { hbitmap_reset_all(result); - return true; + return; } if (a->granularity != b->granularity) { @@ -935,7 +926,7 @@ bool hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result) if (b != result) { hbitmap_sparse_merge(result, b); } - return true; + return; } /* This merge is O(size), as BITS_PER_LONG and HBITMAP_LEVELS are constant. @@ -951,8 +942,6 @@ bool hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result) /* Recompute the dirty count */ result->count = hb_count_between(result, 0, result->size - 1); - - return true; } char *hbitmap_sha256(const HBitmap *bitmap, Error **errp) |