diff options
| -rw-r--r-- | MAINTAINERS | 6 | ||||
| -rw-r--r-- | block/blkio.c | 831 | ||||
| -rw-r--r-- | block/meson.build | 1 | ||||
| -rw-r--r-- | meson.build | 9 | ||||
| -rw-r--r-- | meson_options.txt | 2 | ||||
| -rw-r--r-- | qapi/block-core.json | 77 | ||||
| -rw-r--r-- | scripts/meson-buildoptions.sh | 3 | ||||
| -rw-r--r-- | tests/qtest/modules-test.c | 3 |
8 files changed, 928 insertions, 4 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index e3d5b7e09c..8b4363c0ff 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3415,6 +3415,12 @@ L: qemu-block@nongnu.org S: Maintained F: block/vdi.c +blkio +M: Stefan Hajnoczi <stefanha@redhat.com> +L: qemu-block@nongnu.org +S: Maintained +F: block/blkio.c + iSCSI M: Ronnie Sahlberg <ronniesahlberg@gmail.com> M: Paolo Bonzini <pbonzini@redhat.com> diff --git a/block/blkio.c b/block/blkio.c new file mode 100644 index 0000000000..b0cfd74b36 --- /dev/null +++ b/block/blkio.c @@ -0,0 +1,831 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * libblkio BlockDriver + * + * Copyright Red Hat, Inc. + * + * Author: + * Stefan Hajnoczi <stefanha@redhat.com> + */ + +#include "qemu/osdep.h" +#include <blkio.h> +#include "block/block_int.h" +#include "qapi/error.h" +#include "qapi/qmp/qdict.h" +#include "qemu/module.h" + +/* + * Keep the QEMU BlockDriver names identical to the libblkio driver names. + * Using macros instead of typing out the string literals avoids typos. + */ +#define DRIVER_IO_URING "io_uring" +#define DRIVER_NVME_IO_URING "nvme-io_uring" +#define DRIVER_VIRTIO_BLK_VHOST_USER "virtio-blk-vhost-user" +#define DRIVER_VIRTIO_BLK_VHOST_VDPA "virtio-blk-vhost-vdpa" + +/* + * Allocated bounce buffers are kept in a list sorted by buffer address. + */ +typedef struct BlkioBounceBuf { + QLIST_ENTRY(BlkioBounceBuf) next; + + /* The bounce buffer */ + struct iovec buf; +} BlkioBounceBuf; + +typedef struct { + /* + * libblkio is not thread-safe so this lock protects ->blkio and + * ->blkioq. + */ + QemuMutex blkio_lock; + struct blkio *blkio; + struct blkioq *blkioq; /* make this multi-queue in the future... */ + int completion_fd; + + /* + * Polling fetches the next completion into this field. + * + * No lock is necessary since only one thread calls aio_poll() and invokes + * fd and poll handlers. + */ + struct blkio_completion poll_completion; + + /* + * Protects ->bounce_pool, ->bounce_bufs, ->bounce_available. + * + * Lock ordering: ->bounce_lock before ->blkio_lock. + */ + CoMutex bounce_lock; + + /* Bounce buffer pool */ + struct blkio_mem_region bounce_pool; + + /* Sorted list of allocated bounce buffers */ + QLIST_HEAD(, BlkioBounceBuf) bounce_bufs; + + /* Queue for coroutines waiting for bounce buffer space */ + CoQueue bounce_available; + + /* The value of the "mem-region-alignment" property */ + size_t mem_region_alignment; + + /* Can we skip adding/deleting blkio_mem_regions? */ + bool needs_mem_regions; +} BDRVBlkioState; + +/* Called with s->bounce_lock held */ +static int blkio_resize_bounce_pool(BDRVBlkioState *s, int64_t bytes) +{ + /* There can be no allocated bounce buffers during resize */ + assert(QLIST_EMPTY(&s->bounce_bufs)); + + /* Pad size to reduce frequency of resize calls */ + bytes += 128 * 1024; + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + int ret; + + if (s->bounce_pool.addr) { + blkio_unmap_mem_region(s->blkio, &s->bounce_pool); + blkio_free_mem_region(s->blkio, &s->bounce_pool); + memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); + } + + /* Automatically freed when s->blkio is destroyed */ + ret = blkio_alloc_mem_region(s->blkio, &s->bounce_pool, bytes); + if (ret < 0) { + return ret; + } + + ret = blkio_map_mem_region(s->blkio, &s->bounce_pool); + if (ret < 0) { + blkio_free_mem_region(s->blkio, &s->bounce_pool); + memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); + return ret; + } + } + + return 0; +} + +/* Called with s->bounce_lock held */ +static bool +blkio_do_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, + int64_t bytes) +{ + void *addr = s->bounce_pool.addr; + BlkioBounceBuf *cur = NULL; + BlkioBounceBuf *prev = NULL; + ptrdiff_t space; + + /* + * This is just a linear search over the holes between requests. An + * efficient allocator would be nice. + */ + QLIST_FOREACH(cur, &s->bounce_bufs, next) { + space = cur->buf.iov_base - addr; + if (bytes <= space) { + QLIST_INSERT_BEFORE(cur, bounce, next); + bounce->buf.iov_base = addr; + bounce->buf.iov_len = bytes; + return true; + } + + addr = cur->buf.iov_base + cur->buf.iov_len; + prev = cur; + } + + /* Is there space after the last request? */ + space = s->bounce_pool.addr + s->bounce_pool.len - addr; + if (bytes > space) { + return false; + } + if (prev) { + QLIST_INSERT_AFTER(prev, bounce, next); + } else { + QLIST_INSERT_HEAD(&s->bounce_bufs, bounce, next); + } + bounce->buf.iov_base = addr; + bounce->buf.iov_len = bytes; + return true; +} + +static int coroutine_fn +blkio_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, + int64_t bytes) +{ + /* + * Ensure fairness: first time around we join the back of the queue, + * subsequently we join the front so we don't lose our place. + */ + CoQueueWaitFlags wait_flags = 0; + + QEMU_LOCK_GUARD(&s->bounce_lock); + + /* Ensure fairness: don't even try if other requests are already waiting */ + if (!qemu_co_queue_empty(&s->bounce_available)) { + qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, + wait_flags); + wait_flags = CO_QUEUE_WAIT_FRONT; + } + + while (true) { + if (blkio_do_alloc_bounce_buffer(s, bounce, bytes)) { + /* Kick the next queued request since there may be space */ + qemu_co_queue_next(&s->bounce_available); + return 0; + } + + /* + * If there are no in-flight requests then the pool was simply too + * small. + */ + if (QLIST_EMPTY(&s->bounce_bufs)) { + bool ok; + int ret; + + ret = blkio_resize_bounce_pool(s, bytes); + if (ret < 0) { + /* Kick the next queued request since that may fail too */ + qemu_co_queue_next(&s->bounce_available); + return ret; + } + + ok = blkio_do_alloc_bounce_buffer(s, bounce, bytes); + assert(ok); /* must have space this time */ + return 0; + } + + qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, + wait_flags); + wait_flags = CO_QUEUE_WAIT_FRONT; + } +} + +static void coroutine_fn blkio_free_bounce_buffer(BDRVBlkioState *s, + BlkioBounceBuf *bounce) +{ + QEMU_LOCK_GUARD(&s->bounce_lock); + + QLIST_REMOVE(bounce, next); + + /* Wake up waiting coroutines since space may now be available */ + qemu_co_queue_next(&s->bounce_available); +} + +/* For async to .bdrv_co_*() conversion */ +typedef struct { + Coroutine *coroutine; + int ret; +} BlkioCoData; + +static void blkio_completion_fd_read(void *opaque) +{ + BlockDriverState *bs = opaque; + BDRVBlkioState *s = bs->opaque; + uint64_t val; + int ret; + + /* Polling may have already fetched a completion */ + if (s->poll_completion.user_data != NULL) { + BlkioCoData *cod = s->poll_completion.user_data; + cod->ret = s->poll_completion.ret; + + /* Clear it in case aio_co_wake() enters a nested event loop */ + s->poll_completion.user_data = NULL; + + aio_co_wake(cod->coroutine); + } + + /* Reset completion fd status */ + ret = read(s->completion_fd, &val, sizeof(val)); + + /* Ignore errors, there's nothing we can do */ + (void)ret; + + /* + * Reading one completion at a time makes nested event loop re-entrancy + * simple. Change this loop to get multiple completions in one go if it + * becomes a performance bottleneck. + */ + while (true) { + struct blkio_completion completion; + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + ret = blkioq_do_io(s->blkioq, &completion, 0, 1, NULL); + } + if (ret != 1) { + break; + } + + BlkioCoData *cod = completion.user_data; + cod->ret = completion.ret; + aio_co_wake(cod->coroutine); + } +} + +static bool blkio_completion_fd_poll(void *opaque) +{ + BlockDriverState *bs = opaque; + BDRVBlkioState *s = bs->opaque; + int ret; + + /* Just in case we already fetched a completion */ + if (s->poll_completion.user_data != NULL) { + return true; + } + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + ret = blkioq_do_io(s->blkioq, &s->poll_completion, 0, 1, NULL); + } + return ret == 1; +} + +static void blkio_completion_fd_poll_ready(void *opaque) +{ + blkio_completion_fd_read(opaque); +} + +static void blkio_attach_aio_context(BlockDriverState *bs, + AioContext *new_context) +{ + BDRVBlkioState *s = bs->opaque; + + aio_set_fd_handler(new_context, + s->completion_fd, + false, + blkio_completion_fd_read, + NULL, + blkio_completion_fd_poll, + blkio_completion_fd_poll_ready, + bs); +} + +static void blkio_detach_aio_context(BlockDriverState *bs) +{ + BDRVBlkioState *s = bs->opaque; + + aio_set_fd_handler(bdrv_get_aio_context(bs), + s->completion_fd, + false, NULL, NULL, NULL, NULL, NULL); +} + +/* Call with s->blkio_lock held to submit I/O after enqueuing a new request */ +static void blkio_submit_io(BlockDriverState *bs) +{ + if (qatomic_read(&bs->io_plugged) == 0) { + BDRVBlkioState *s = bs->opaque; + + blkioq_do_io(s->blkioq, NULL, 0, 0, NULL); + } +} + +static int coroutine_fn +blkio_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) +{ + BDRVBlkioState *s = bs->opaque; + BlkioCoData cod = { + .coroutine = qemu_coroutine_self(), + }; + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + blkioq_discard(s->blkioq, offset, bytes, &cod, 0); + blkio_submit_io(bs); + } + + qemu_coroutine_yield(); + return cod.ret; +} + +static int coroutine_fn +blkio_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, + QEMUIOVector *qiov, BdrvRequestFlags flags) +{ + BlkioCoData cod = { + .coroutine = qemu_coroutine_self(), + }; + BDRVBlkioState *s = bs->opaque; + bool use_bounce_buffer = s->needs_mem_regions; + BlkioBounceBuf bounce; + struct iovec *iov = qiov->iov; + int iovcnt = qiov->niov; + + if (use_bounce_buffer) { + int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); + if (ret < 0) { + return ret; + } + + iov = &bounce.buf; + iovcnt = 1; + } + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + blkioq_readv(s->blkioq, offset, iov, iovcnt, &cod, 0); + blkio_submit_io(bs); + } + + qemu_coroutine_yield(); + + if (use_bounce_buffer) { + if (cod.ret == 0) { + qemu_iovec_from_buf(qiov, 0, + bounce.buf.iov_base, + bounce.buf.iov_len); + } + + blkio_free_bounce_buffer(s, &bounce); + } + + return cod.ret; +} + +static int coroutine_fn blkio_co_pwritev(BlockDriverState *bs, int64_t offset, + int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags) +{ + uint32_t blkio_flags = (flags & BDRV_REQ_FUA) ? BLKIO_REQ_FUA : 0; + BlkioCoData cod = { + .coroutine = qemu_coroutine_self(), + }; + BDRVBlkioState *s = bs->opaque; + bool use_bounce_buffer = s->needs_mem_regions; + BlkioBounceBuf bounce; + struct iovec *iov = qiov->iov; + int iovcnt = qiov->niov; + + if (use_bounce_buffer) { + int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); + if (ret < 0) { + return ret; + } + + qemu_iovec_to_buf(qiov, 0, bounce.buf.iov_base, bytes); + iov = &bounce.buf; + iovcnt = 1; + } + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + blkioq_writev(s->blkioq, offset, iov, iovcnt, &cod, blkio_flags); + blkio_submit_io(bs); + } + + qemu_coroutine_yield(); + + if (use_bounce_buffer) { + blkio_free_bounce_buffer(s, &bounce); + } + + return cod.ret; +} + +static int coroutine_fn blkio_co_flush(BlockDriverState *bs) +{ + BDRVBlkioState *s = bs->opaque; + BlkioCoData cod = { + .coroutine = qemu_coroutine_self(), + }; + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + blkioq_flush(s->blkioq, &cod, 0); + blkio_submit_io(bs); + } + + qemu_coroutine_yield(); + return cod.ret; +} + +static int coroutine_fn blkio_co_pwrite_zeroes(BlockDriverState *bs, + int64_t offset, int64_t bytes, BdrvRequestFlags flags) +{ + BDRVBlkioState *s = bs->opaque; + BlkioCoData cod = { + .coroutine = qemu_coroutine_self(), + }; + uint32_t blkio_flags = 0; + + if (flags & BDRV_REQ_FUA) { + blkio_flags |= BLKIO_REQ_FUA; + } + if (!(flags & BDRV_REQ_MAY_UNMAP)) { + blkio_flags |= BLKIO_REQ_NO_UNMAP; + } + if (flags & BDRV_REQ_NO_FALLBACK) { + blkio_flags |= BLKIO_REQ_NO_FALLBACK; + } + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + blkioq_write_zeroes(s->blkioq, offset, bytes, &cod, blkio_flags); + blkio_submit_io(bs); + } + + qemu_coroutine_yield(); + return cod.ret; +} + +static void blkio_io_unplug(BlockDriverState *bs) +{ + BDRVBlkioState *s = bs->opaque; + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + blkio_submit_io(bs); + } +} + +static int blkio_io_uring_open(BlockDriverState *bs, QDict *options, int flags, + Error **errp) +{ + const char *filename = qdict_get_str(options, "filename"); + BDRVBlkioState *s = bs->opaque; + int ret; + + ret = blkio_set_str(s->blkio, "path", filename); + qdict_del(options, "filename"); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set path: %s", + blkio_get_error_msg()); + return ret; + } + + if (flags & BDRV_O_NOCACHE) { + ret = blkio_set_bool(s->blkio, "direct", true); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set direct: %s", + blkio_get_error_msg()); + return ret; + } + } + + return 0; +} + +static int blkio_nvme_io_uring(BlockDriverState *bs, QDict *options, int flags, + Error **errp) +{ + const char *filename = qdict_get_str(options, "filename"); + BDRVBlkioState *s = bs->opaque; + int ret; + + ret = blkio_set_str(s->blkio, "path", filename); + qdict_del(options, "filename"); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set path: %s", + blkio_get_error_msg()); + return ret; + } + + if (!(flags & BDRV_O_NOCACHE)) { + error_setg(errp, "cache.direct=off is not supported"); + return -EINVAL; + } + + return 0; +} + +static int blkio_virtio_blk_common_open(BlockDriverState *bs, + QDict *options, int flags, Error **errp) +{ + const char *path = qdict_get_try_str(options, "path"); + BDRVBlkioState *s = bs->opaque; + int ret; + + if (!path) { + error_setg(errp, "missing 'path' option"); + return -EINVAL; + } + + ret = blkio_set_str(s->blkio, "path", path); + qdict_del(options, "path"); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set path: %s", + blkio_get_error_msg()); + return ret; + } + + if (!(flags & BDRV_O_NOCACHE)) { + error_setg(errp, "cache.direct=off is not supported"); + return -EINVAL; + } + return 0; +} + +static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, + Error **errp) +{ + const char *blkio_driver = bs->drv->protocol_name; + BDRVBlkioState *s = bs->opaque; + int ret; + + ret = blkio_create(blkio_driver, &s->blkio); + if (ret < 0) { + error_setg_errno(errp, -ret, "blkio_create failed: %s", + blkio_get_error_msg()); + return ret; + } + + if (strcmp(blkio_driver, DRIVER_IO_URING) == 0) { + ret = blkio_io_uring_open(bs, options, flags, errp); + } else if (strcmp(blkio_driver, DRIVER_NVME_IO_URING) == 0) { + ret = blkio_nvme_io_uring(bs, options, flags, errp); + } else if (strcmp(blkio_driver, DRIVER_VIRTIO_BLK_VHOST_USER) == 0) { + ret = blkio_virtio_blk_common_open(bs, options, flags, errp); + } else if (strcmp(blkio_driver, DRIVER_VIRTIO_BLK_VHOST_VDPA) == 0) { + ret = blkio_virtio_blk_common_open(bs, options, flags, errp); + } else { + g_assert_not_reached(); + } + if (ret < 0) { + blkio_destroy(&s->blkio); + return ret; + } + + if (!(flags & BDRV_O_RDWR)) { + ret = blkio_set_bool(s->blkio, "read-only", true); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set read-only: %s", + blkio_get_error_msg()); + blkio_destroy(&s->blkio); + return ret; + } + } + + ret = blkio_connect(s->blkio); + if (ret < 0) { + error_setg_errno(errp, -ret, "blkio_connect failed: %s", + blkio_get_error_msg()); + blkio_destroy(&s->blkio); + return ret; + } + + ret = blkio_get_bool(s->blkio, + "needs-mem-regions", + &s->needs_mem_regions); + if (ret < 0) { + error_setg_errno(errp, -ret, + "failed to get needs-mem-regions: %s", + blkio_get_error_msg()); + blkio_destroy(&s->blkio); + return ret; + } + + ret = blkio_get_uint64(s->blkio, + "mem-region-alignment", + &s->mem_region_alignment); + if (ret < 0) { + error_setg_errno(errp, -ret, + "failed to get mem-region-alignment: %s", + blkio_get_error_msg()); + blkio_destroy(&s->blkio); + return ret; + } + + ret = blkio_start(s->blkio); + if (ret < 0) { + error_setg_errno(errp, -ret, "blkio_start failed: %s", + blkio_get_error_msg()); + blkio_destroy(&s->blkio); + return ret; + } + + bs->supported_write_flags = BDRV_REQ_FUA; + bs->supported_zero_flags = BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | + BDRV_REQ_NO_FALLBACK; + + qemu_mutex_init(&s->blkio_lock); + qemu_co_mutex_init(&s->bounce_lock); + qemu_co_queue_init(&s->bounce_available); + QLIST_INIT(&s->bounce_bufs); + s->blkioq = blkio_get_queue(s->blkio, 0); + s->completion_fd = blkioq_get_completion_fd(s->blkioq); + + blkio_attach_aio_context(bs, bdrv_get_aio_context(bs)); + return 0; +} + +static void blkio_close(BlockDriverState *bs) +{ + BDRVBlkioState *s = bs->opaque; + + /* There is no destroy() API for s->bounce_lock */ + + qemu_mutex_destroy(&s->blkio_lock); + blkio_detach_aio_context(bs); + blkio_destroy(&s->blkio); +} + +static int64_t blkio_getlength(BlockDriverState *bs) +{ + BDRVBlkioState *s = bs->opaque; + uint64_t capacity; + int ret; + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + ret = blkio_get_uint64(s->blkio, "capacity", &capacity); + } + if (ret < 0) { + return -ret; + } + + return capacity; +} + +static int blkio_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) +{ + return 0; +} + +static void blkio_refresh_limits(BlockDriverState *bs, Error **errp) +{ + BDRVBlkioState *s = bs->opaque; + QEMU_LOCK_GUARD(&s->blkio_lock); + int value; + int ret; + + ret = blkio_get_int(s->blkio, "request-alignment", &value); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"request-alignment\": %s", + blkio_get_error_msg()); + return; + } + bs->bl.request_alignment = value; + if (bs->bl.request_alignment < 1 || + bs->bl.request_alignment >= INT_MAX || + !is_power_of_2(bs->bl.request_alignment)) { + error_setg(errp, "invalid \"request-alignment\" value %" PRIu32 ", " + "must be a power of 2 less than INT_MAX", + bs->bl.request_alignment); + return; + } + + ret = blkio_get_int(s->blkio, "optimal-io-size", &value); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"optimal-io-size\": %s", + blkio_get_error_msg()); + return; + } + bs->bl.opt_transfer = value; + if (bs->bl.opt_transfer > INT_MAX || + (bs->bl.opt_transfer % bs->bl.request_alignment)) { + error_setg(errp, "invalid \"optimal-io-size\" value %" PRIu32 ", must " + "be a multiple of %" PRIu32, bs->bl.opt_transfer, + bs->bl.request_alignment); + return; + } + + ret = blkio_get_int(s->blkio, "max-transfer", &value); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"max-transfer\": %s", + blkio_get_error_msg()); + return; + } + bs->bl.max_transfer = value; + if ((bs->bl.max_transfer % bs->bl.request_alignment) || + (bs->bl.opt_transfer && (bs->bl.max_transfer % bs->bl.opt_transfer))) { + error_setg(errp, "invalid \"max-transfer\" value %" PRIu32 ", must be " + "a multiple of %" PRIu32 " and %" PRIu32 " (if non-zero)", + bs->bl.max_transfer, bs->bl.request_alignment, + bs->bl.opt_transfer); + return; + } + + ret = blkio_get_int(s->blkio, "buf-alignment", &value); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"buf-alignment\": %s", + blkio_get_error_msg()); + return; + } + if (value < 1) { + error_setg(errp, "invalid \"buf-alignment\" value %d, must be " + "positive", value); + return; + } + bs->bl.min_mem_alignment = value; + + ret = blkio_get_int(s->blkio, "optimal-buf-alignment", &value); + if (ret < 0) { + error_setg_errno(errp, -ret, + "failed to get \"optimal-buf-alignment\": %s", + blkio_get_error_msg()); + return; + } + if (value < 1) { + error_setg(errp, "invalid \"optimal-buf-alignment\" value %d, " + "must be positive", value); + return; + } + bs->bl.opt_mem_alignment = value; + + ret = blkio_get_int(s->blkio, "max-segments", &value); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"max-segments\": %s", + blkio_get_error_msg()); + return; + } + if (value < 1) { + error_setg(errp, "invalid \"max-segments\" value %d, must be positive", + value); + return; + } + bs->bl.max_iov = value; +} + +/* + * TODO + * Missing libblkio APIs: + * - block_status + * - co_invalidate_cache + * + * Out of scope? + * - create + * - truncate + */ + +#define BLKIO_DRIVER(name, ...) \ + { \ + .format_name = name, \ + .protocol_name = name, \ + .instance_size = sizeof(BDRVBlkioState), \ + .bdrv_file_open = blkio_file_open, \ + .bdrv_close = blkio_close, \ + .bdrv_getlength = blkio_getlength, \ + .bdrv_get_info = blkio_get_info, \ + .bdrv_attach_aio_context = blkio_attach_aio_context, \ + .bdrv_detach_aio_context = blkio_detach_aio_context, \ + .bdrv_co_pdiscard = blkio_co_pdiscard, \ + .bdrv_co_preadv = blkio_co_preadv, \ + .bdrv_co_pwritev = blkio_co_pwritev, \ + .bdrv_co_flush_to_disk = blkio_co_flush, \ + .bdrv_co_pwrite_zeroes = blkio_co_pwrite_zeroes, \ + .bdrv_io_unplug = blkio_io_unplug, \ + .bdrv_refresh_limits = blkio_refresh_limits, \ + __VA_ARGS__ \ + } + +static BlockDriver bdrv_io_uring = BLKIO_DRIVER( + DRIVER_IO_URING, + .bdrv_needs_filename = true, +); + +static BlockDriver bdrv_nvme_io_uring = BLKIO_DRIVER( + DRIVER_NVME_IO_URING, + .bdrv_needs_filename = true, +); + +static BlockDriver bdrv_virtio_blk_vhost_user = BLKIO_DRIVER( + DRIVER_VIRTIO_BLK_VHOST_USER +); + +static BlockDriver bdrv_virtio_blk_vhost_vdpa = BLKIO_DRIVER( + DRIVER_VIRTIO_BLK_VHOST_VDPA +); + +static void bdrv_blkio_init(void) +{ + bdrv_register(&bdrv_io_uring); + bdrv_register(&bdrv_nvme_io_uring); + bdrv_register(&bdrv_virtio_blk_vhost_user); + bdrv_register(&bdrv_virtio_blk_vhost_vdpa); +} + +block_init(bdrv_blkio_init); diff --git a/block/meson.build b/block/meson.build index 60bc305597..500878f082 100644 --- a/block/meson.build +++ b/block/meson.build @@ -92,6 +92,7 @@ block_modules = {} modsrc = [] foreach m : [ + [blkio, 'blkio', files('blkio.c')], [curl, 'curl', files('curl.c')], [glusterfs, 'gluster', files('gluster.c')], [libiscsi, 'iscsi', [files('iscsi.c'), libm]], diff --git a/meson.build b/meson.build index b686dfef75..1e9068adf6 100644 --- a/meson.build +++ b/meson.build @@ -771,6 +771,13 @@ if not get_option('virglrenderer').auto() or have_system or have_vhost_user_gpu required: get_option('virglrenderer'), kwargs: static_kwargs) endif +blkio = not_found +if not get_option('blkio').auto() or have_block + blkio = dependency('blkio', + method: 'pkg-config', + required: get_option('blkio'), + kwargs: static_kwargs) +endif curl = not_found if not get_option('curl').auto() or have_block curl = dependency('libcurl', version: '>=7.29.0', @@ -1815,6 +1822,7 @@ config_host_data.set('CONFIG_LIBUDEV', libudev.found()) config_host_data.set('CONFIG_LZO', lzo.found()) config_host_data.set('CONFIG_MPATH', mpathpersist.found()) config_host_data.set('CONFIG_MPATH_NEW_API', mpathpersist_new_api) +config_host_data.set('CONFIG_BLKIO', blkio.found()) config_host_data.set('CONFIG_CURL', curl.found()) config_host_data.set('CONFIG_CURSES', curses.found()) config_host_data.set('CONFIG_GBM', gbm.found()) @@ -3869,6 +3877,7 @@ summary_info += {'PAM': pam} summary_info += {'iconv support': iconv} summary_info += {'curses support': curses} summary_info += {'virgl support': virgl} +summary_info += {'blkio support': blkio} summary_info += {'curl support': curl} summary_info += {'Multipath support': mpathpersist} summary_info += {'PNG support': png} diff --git a/meson_options.txt b/meson_options.txt index 79c6af18d5..66128178bf 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -117,6 +117,8 @@ option('bzip2', type : 'feature', value : 'auto', description: 'bzip2 support for DMG images') option('cap_ng', type : 'feature', value : 'auto', description: 'cap_ng support') +option('blkio', type : 'feature', value : 'auto', + description: 'libblkio block device driver') option('bpf', type : 'feature', value : 'auto', description: 'eBPF support') option('cocoa', type : 'feature', value : 'auto', diff --git a/qapi/block-core.json b/qapi/block-core.json index 882b266532..cb5079e645 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2951,11 +2951,18 @@ 'file', 'snapshot-access', 'ftp', 'ftps', 'gluster', {'name': 'host_cdrom', 'if': 'HAVE_HOST_BLOCK_DEVICE' }, {'name': 'host_device', 'if': 'HAVE_HOST_BLOCK_DEVICE' }, - 'http', 'https', 'iscsi', - 'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels', - 'preallocate', 'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd', + 'http', 'https', + { 'name': 'io_uring', 'if': 'CONFIG_BLKIO' }, + 'iscsi', + 'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', + { 'name': 'nvme-io_uring', 'if': 'CONFIG_BLKIO' }, + 'parallels', 'preallocate', 'qcow', 'qcow2', 'qed', 'quorum', + 'raw', 'rbd', { 'name': 'replication', 'if': 'CONFIG_REPLICATION' }, - 'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat' ] } + 'ssh', 'throttle', 'vdi', 'vhdx', + { 'name': 'virtio-blk-vhost-user', 'if': 'CONFIG_BLKIO' }, + { 'name': 'virtio-blk-vhost-vdpa', 'if': 'CONFIG_BLKIO' }, + 'vmdk', 'vpc', 'vvfat' ] } ## # @BlockdevOptionsFile: @@ -3679,6 +3686,58 @@ '*logfile': 'str' } } ## +# @BlockdevOptionsIoUring: +# +# Driver specific block device options for the io_uring backend. +# +# @filename: path to the image file +# +# Since: 7.2 +## +{ 'struct': 'BlockdevOptionsIoUring', + 'data': { 'filename': 'str' }, + 'if': 'CONFIG_BLKIO' } + +## +# @BlockdevOptionsNvmeIoUring: +# +# Driver specific block device options for the nvme-io_uring backend. +# +# @filename: path to the image file +# +# Since: 7.2 +## +{ 'struct': 'BlockdevOptionsNvmeIoUring', + 'data': { 'filename': 'str' }, + 'if': 'CONFIG_BLKIO' } + +## +# @BlockdevOptionsVirtioBlkVhostUser: +# +# Driver specific block device options for the virtio-blk-vhost-user backend. +# +# @path: path to the vhost-user UNIX domain socket. +# +# Since: 7.2 +## +{ 'struct': 'BlockdevOptionsVirtioBlkVhostUser', + 'data': { 'path': 'str' }, + 'if': 'CONFIG_BLKIO' } + +## +# @BlockdevOptionsVirtioBlkVhostVdpa: +# +# Driver specific block device options for the virtio-blk-vhost-vdpa backend. +# +# @path: path to the vhost-vdpa character device. +# +# Since: 7.2 +## +{ 'struct': 'BlockdevOptionsVirtioBlkVhostVdpa', + 'data': { 'path': 'str' }, + 'if': 'CONFIG_BLKIO' } + +## # @IscsiTransport: # # An enumeration of libiscsi transport types @@ -4305,6 +4364,8 @@ 'if': 'HAVE_HOST_BLOCK_DEVICE' }, 'http': 'BlockdevOptionsCurlHttp', 'https': 'BlockdevOptionsCurlHttps', + 'io_uring': { 'type': 'BlockdevOptionsIoUring', + 'if': 'CONFIG_BLKIO' }, 'iscsi': 'BlockdevOptionsIscsi', 'luks': 'BlockdevOptionsLUKS', 'nbd': 'BlockdevOptionsNbd', @@ -4312,6 +4373,8 @@ 'null-aio': 'BlockdevOptionsNull', 'null-co': 'BlockdevOptionsNull', 'nvme': 'BlockdevOptionsNVMe', + 'nvme-io_uring': { 'type': 'BlockdevOptionsNvmeIoUring', + 'if': 'CONFIG_BLKIO' }, 'parallels': 'BlockdevOptionsGenericFormat', 'preallocate':'BlockdevOptionsPreallocate', 'qcow2': 'BlockdevOptionsQcow2', @@ -4327,6 +4390,12 @@ 'throttle': 'BlockdevOptionsThrottle', 'vdi': 'BlockdevOptionsGenericFormat', 'vhdx': 'BlockdevOptionsGenericFormat', + 'virtio-blk-vhost-user': + { 'type': 'BlockdevOptionsVirtioBlkVhostUser', + 'if': 'CONFIG_BLKIO' }, + 'virtio-blk-vhost-vdpa': + { 'type': 'BlockdevOptionsVirtioBlkVhostVdpa', + 'if': 'CONFIG_BLKIO' }, 'vmdk': 'BlockdevOptionsGenericCOWFormat', 'vpc': 'BlockdevOptionsGenericFormat', 'vvfat': 'BlockdevOptionsVVFAT' diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh index eb3267bef5..2cb0de5601 100644 --- a/scripts/meson-buildoptions.sh +++ b/scripts/meson-buildoptions.sh @@ -67,6 +67,7 @@ meson_options_help() { printf "%s\n" ' auth-pam PAM access control' printf "%s\n" ' avx2 AVX2 optimizations' printf "%s\n" ' avx512f AVX512F optimizations' + printf "%s\n" ' blkio libblkio block device driver' printf "%s\n" ' bochs bochs image format support' printf "%s\n" ' bpf eBPF support' printf "%s\n" ' brlapi brlapi character device driver' @@ -198,6 +199,8 @@ _meson_option_parse() { --disable-gcov) printf "%s" -Db_coverage=false ;; --enable-lto) printf "%s" -Db_lto=true ;; --disable-lto) printf "%s" -Db_lto=false ;; + --enable-blkio) printf "%s" -Dblkio=enabled ;; + --disable-blkio) printf "%s" -Dblkio=disabled ;; --block-drv-ro-whitelist=*) quote_sh "-Dblock_drv_ro_whitelist=$2" ;; --block-drv-rw-whitelist=*) quote_sh "-Dblock_drv_rw_whitelist=$2" ;; --enable-block-drv-whitelist-in-tools) printf "%s" -Dblock_drv_whitelist_in_tools=true ;; diff --git a/tests/qtest/modules-test.c b/tests/qtest/modules-test.c index 88217686e1..be2575ae6d 100644 --- a/tests/qtest/modules-test.c +++ b/tests/qtest/modules-test.c @@ -16,6 +16,9 @@ static void test_modules_load(const void *data) int main(int argc, char *argv[]) { const char *modules[] = { +#ifdef CONFIG_BLKIO + "block-", "blkio", +#endif #ifdef CONFIG_CURL "block-", "curl", #endif |