diff options
42 files changed, 1435 insertions, 96 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index 32e495e165..64893e36bc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2510,6 +2510,7 @@ F: block* F: block/ F: hw/block/ F: include/block/ +F: include/sysemu/block-*.h F: qemu-img* F: docs/tools/qemu-img.rst F: qemu-io* @@ -3415,6 +3416,12 @@ 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.c b/block.c index 1fbf6b9e69..c69be2cfe3 100644 --- a/block.c +++ b/block.c @@ -1641,6 +1641,20 @@ static int bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, goto open_failed; } + assert(!(bs->supported_read_flags & ~BDRV_REQ_MASK)); + assert(!(bs->supported_write_flags & ~BDRV_REQ_MASK)); + + /* + * Always allow the BDRV_REQ_REGISTERED_BUF optimization hint. This saves + * drivers that pass read/write requests through to a child the trouble of + * declaring support explicitly. + * + * Drivers must not propagate this flag accidentally when they initiate I/O + * to a bounce buffer. That case should be rare though. + */ + bs->supported_read_flags |= BDRV_REQ_REGISTERED_BUF; + bs->supported_write_flags |= BDRV_REQ_REGISTERED_BUF; + ret = refresh_total_sectors(bs, bs->total_sectors); if (ret < 0) { error_setg_errno(errp, -ret, "Could not refresh total sector count"); diff --git a/block/blkio.c b/block/blkio.c new file mode 100644 index 0000000000..82f26eedd2 --- /dev/null +++ b/block/blkio.c @@ -0,0 +1,1008 @@ +/* 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 "exec/memory.h" +#include "exec/cpu-common.h" /* for qemu_ram_get_fd() */ +#include "qapi/error.h" +#include "qemu/error-report.h" +#include "qapi/qmp/qdict.h" +#include "qemu/module.h" +#include "exec/memory.h" /* for ram_block_discard_disable() */ + +/* + * 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; + + /* Are file descriptors necessary for blkio_mem_regions? */ + bool needs_mem_region_fd; + + /* Are madvise(MADV_DONTNEED)-style operations unavailable? */ + bool may_pin_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 && !(flags & BDRV_REQ_REGISTERED_BUF); + 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 && !(flags & BDRV_REQ_REGISTERED_BUF); + 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); + } +} + +typedef enum { + BMRR_OK, + BMRR_SKIP, + BMRR_FAIL, +} BlkioMemRegionResult; + +/* + * Produce a struct blkio_mem_region for a given address and size. + * + * This function produces identical results when called multiple times with the + * same arguments. This property is necessary because blkio_unmap_mem_region() + * must receive the same struct blkio_mem_region field values that were passed + * to blkio_map_mem_region(). + */ +static BlkioMemRegionResult +blkio_mem_region_from_host(BlockDriverState *bs, + void *host, size_t size, + struct blkio_mem_region *region, + Error **errp) +{ + BDRVBlkioState *s = bs->opaque; + int fd = -1; + ram_addr_t fd_offset = 0; + + if (((uintptr_t)host | size) % s->mem_region_alignment) { + error_setg(errp, "unaligned buf %p with size %zu", host, size); + return BMRR_FAIL; + } + + /* Attempt to find the fd for the underlying memory */ + if (s->needs_mem_region_fd) { + RAMBlock *ram_block; + RAMBlock *end_block; + ram_addr_t offset; + + /* + * bdrv_register_buf() is called with the BQL held so mr lives at least + * until this function returns. + */ + ram_block = qemu_ram_block_from_host(host, false, &fd_offset); + if (ram_block) { + fd = qemu_ram_get_fd(ram_block); + } + if (fd == -1) { + /* + * Ideally every RAMBlock would have an fd. pc-bios and other + * things don't. Luckily they are usually not I/O buffers and we + * can just ignore them. + */ + return BMRR_SKIP; + } + + /* Make sure the fd covers the entire range */ + end_block = qemu_ram_block_from_host(host + size - 1, false, &offset); + if (ram_block != end_block) { + error_setg(errp, "registered buffer at %p with size %zu extends " + "beyond RAMBlock", host, size); + return BMRR_FAIL; + } + } + + *region = (struct blkio_mem_region){ + .addr = host, + .len = size, + .fd = fd, + .fd_offset = fd_offset, + }; + return BMRR_OK; +} + +static bool blkio_register_buf(BlockDriverState *bs, void *host, size_t size, + Error **errp) +{ + BDRVBlkioState *s = bs->opaque; + struct blkio_mem_region region; + BlkioMemRegionResult region_result; + int ret; + + /* + * Mapping memory regions conflicts with RAM discard (virtio-mem) when + * there is pinning, so only do it when necessary. + */ + if (!s->needs_mem_regions && s->may_pin_mem_regions) { + return true; + } + + region_result = blkio_mem_region_from_host(bs, host, size, ®ion, errp); + if (region_result == BMRR_SKIP) { + return true; + } else if (region_result != BMRR_OK) { + return false; + } + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + ret = blkio_map_mem_region(s->blkio, ®ion); + } + + if (ret < 0) { + error_setg(errp, "Failed to add blkio mem region %p with size %zu: %s", + host, size, blkio_get_error_msg()); + return false; + } + return true; +} + +static void blkio_unregister_buf(BlockDriverState *bs, void *host, size_t size) +{ + BDRVBlkioState *s = bs->opaque; + struct blkio_mem_region region; + + /* See blkio_register_buf() */ + if (!s->needs_mem_regions && s->may_pin_mem_regions) { + return; + } + + if (blkio_mem_region_from_host(bs, host, size, ®ion, NULL) != BMRR_OK) { + return; + } + + WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { + blkio_unmap_mem_region(s->blkio, ®ion); + } +} + +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_bool(s->blkio, + "needs-mem-region-fd", + &s->needs_mem_region_fd); + if (ret < 0) { + error_setg_errno(errp, -ret, + "failed to get needs-mem-region-fd: %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_get_bool(s->blkio, + "may-pin-mem-regions", + &s->may_pin_mem_regions); + if (ret < 0) { + /* Be conservative (assume pinning) if the property is not supported */ + s->may_pin_mem_regions = s->needs_mem_regions; + } + + /* + * Notify if libblkio drivers pin memory and prevent features like + * virtio-mem from working. + */ + if (s->may_pin_mem_regions) { + ret = ram_block_discard_disable(true); + if (ret < 0) { + error_setg_errno(errp, -ret, "ram_block_discard_disable() failed"); + 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); + if (s->may_pin_mem_regions) { + ram_block_discard_disable(false); + } + return ret; + } + + bs->supported_write_flags = BDRV_REQ_FUA | BDRV_REQ_REGISTERED_BUF; + 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); + + if (s->may_pin_mem_regions) { + ram_block_discard_disable(false); + } +} + +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, \ + .bdrv_register_buf = blkio_register_buf, \ + .bdrv_unregister_buf = blkio_unregister_buf, \ + __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/blkverify.c b/block/blkverify.c index 020b1ae7b6..f36fd6aeb2 100644 --- a/block/blkverify.c +++ b/block/blkverify.c @@ -235,8 +235,8 @@ blkverify_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, qemu_iovec_init(&raw_qiov, qiov->niov); qemu_iovec_clone(&raw_qiov, qiov, buf); - ret = blkverify_co_prwv(bs, &r, offset, bytes, qiov, &raw_qiov, flags, - false); + ret = blkverify_co_prwv(bs, &r, offset, bytes, qiov, &raw_qiov, + flags & ~BDRV_REQ_REGISTERED_BUF, false); cmp_offset = qemu_iovec_compare(qiov, &raw_qiov); if (cmp_offset != -1) { diff --git a/block/block-backend.c b/block/block-backend.c index aa4adf06ae..4f59664397 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -2545,16 +2545,16 @@ static void blk_root_drained_end(BdrvChild *child, int *drained_end_counter) } } -void blk_register_buf(BlockBackend *blk, void *host, size_t size) +bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp) { GLOBAL_STATE_CODE(); - bdrv_register_buf(blk_bs(blk), host, size); + return bdrv_register_buf(blk_bs(blk), host, size, errp); } -void blk_unregister_buf(BlockBackend *blk, void *host) +void blk_unregister_buf(BlockBackend *blk, void *host, size_t size) { GLOBAL_STATE_CODE(); - bdrv_unregister_buf(blk_bs(blk), host); + bdrv_unregister_buf(blk_bs(blk), host, size); } int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, diff --git a/block/block-ram-registrar.c b/block/block-ram-registrar.c new file mode 100644 index 0000000000..25dbafa789 --- /dev/null +++ b/block/block-ram-registrar.c @@ -0,0 +1,58 @@ +/* + * BlockBackend RAM Registrar + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "sysemu/block-backend.h" +#include "sysemu/block-ram-registrar.h" +#include "qapi/error.h" + +static void ram_block_added(RAMBlockNotifier *n, void *host, size_t size, + size_t max_size) +{ + BlockRAMRegistrar *r = container_of(n, BlockRAMRegistrar, notifier); + Error *err = NULL; + + if (!r->ok) { + return; /* don't try again if we've already failed */ + } + + if (!blk_register_buf(r->blk, host, max_size, &err)) { + error_report_err(err); + ram_block_notifier_remove(&r->notifier); + r->ok = false; + } +} + +static void ram_block_removed(RAMBlockNotifier *n, void *host, size_t size, + size_t max_size) +{ + BlockRAMRegistrar *r = container_of(n, BlockRAMRegistrar, notifier); + blk_unregister_buf(r->blk, host, max_size); +} + +void blk_ram_registrar_init(BlockRAMRegistrar *r, BlockBackend *blk) +{ + r->blk = blk; + r->notifier = (RAMBlockNotifier){ + .ram_block_added = ram_block_added, + .ram_block_removed = ram_block_removed, + + /* + * .ram_block_resized() is not necessary because we use the max_size + * value that does not change across resize. + */ + }; + r->ok = true; + + ram_block_notifier_add(&r->notifier); +} + +void blk_ram_registrar_destroy(BlockRAMRegistrar *r) +{ + if (r->ok) { + ram_block_notifier_remove(&r->notifier); + } +} diff --git a/block/crypto.c b/block/crypto.c index 7a57774b76..c7365598a7 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -410,7 +410,6 @@ block_crypto_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); - assert(!flags); assert(payload_offset < INT64_MAX); assert(QEMU_IS_ALIGNED(offset, sector_size)); assert(QEMU_IS_ALIGNED(bytes, sector_size)); @@ -473,7 +472,8 @@ block_crypto_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); - assert(!(flags & ~BDRV_REQ_FUA)); + flags &= ~BDRV_REQ_REGISTERED_BUF; + assert(payload_offset < INT64_MAX); assert(QEMU_IS_ALIGNED(offset, sector_size)); assert(QEMU_IS_ALIGNED(bytes, sector_size)); diff --git a/block/file-posix.c b/block/file-posix.c index 23acffb9a4..b9647c5ffc 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -2133,7 +2133,6 @@ static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags) { - assert(flags == 0); return raw_co_prw(bs, offset, bytes, qiov, QEMU_AIO_WRITE); } diff --git a/block/gluster.c b/block/gluster.c index bb1144cf6a..7c90f7ba4b 100644 --- a/block/gluster.c +++ b/block/gluster.c @@ -1236,7 +1236,6 @@ static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs, QEMUIOVector *qiov, int flags) { - assert(!flags); return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1); } diff --git a/block/io.c b/block/io.c index d30073036e..a9673465dd 100644 --- a/block/io.c +++ b/block/io.c @@ -1130,8 +1130,7 @@ static int coroutine_fn bdrv_driver_preadv(BlockDriverState *bs, int ret; bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, &error_abort); - assert(!(flags & ~BDRV_REQ_MASK)); - assert(!(flags & BDRV_REQ_NO_FALLBACK)); + assert(!(flags & ~bs->supported_read_flags)); if (!drv) { return -ENOMEDIUM; @@ -1195,23 +1194,29 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs, BdrvRequestFlags flags) { BlockDriver *drv = bs->drv; + bool emulate_fua = false; int64_t sector_num; unsigned int nb_sectors; QEMUIOVector local_qiov; int ret; bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, &error_abort); - assert(!(flags & ~BDRV_REQ_MASK)); - assert(!(flags & BDRV_REQ_NO_FALLBACK)); if (!drv) { return -ENOMEDIUM; } + if ((flags & BDRV_REQ_FUA) && + (~bs->supported_write_flags & BDRV_REQ_FUA)) { + flags &= ~BDRV_REQ_FUA; + emulate_fua = true; + } + + flags &= bs->supported_write_flags; + if (drv->bdrv_co_pwritev_part) { ret = drv->bdrv_co_pwritev_part(bs, offset, bytes, qiov, qiov_offset, - flags & bs->supported_write_flags); - flags &= ~bs->supported_write_flags; + flags); goto emulate_flags; } @@ -1221,9 +1226,7 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs, } if (drv->bdrv_co_pwritev) { - ret = drv->bdrv_co_pwritev(bs, offset, bytes, qiov, - flags & bs->supported_write_flags); - flags &= ~bs->supported_write_flags; + ret = drv->bdrv_co_pwritev(bs, offset, bytes, qiov, flags); goto emulate_flags; } @@ -1233,10 +1236,8 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs, .coroutine = qemu_coroutine_self(), }; - acb = drv->bdrv_aio_pwritev(bs, offset, bytes, qiov, - flags & bs->supported_write_flags, + acb = drv->bdrv_aio_pwritev(bs, offset, bytes, qiov, flags, bdrv_co_io_em_complete, &co); - flags &= ~bs->supported_write_flags; if (acb == NULL) { ret = -EIO; } else { @@ -1254,12 +1255,10 @@ static int coroutine_fn bdrv_driver_pwritev(BlockDriverState *bs, assert(bytes <= BDRV_REQUEST_MAX_BYTES); assert(drv->bdrv_co_writev); - ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov, - flags & bs->supported_write_flags); - flags &= ~bs->supported_write_flags; + ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov, flags); emulate_flags: - if (ret == 0 && (flags & BDRV_REQ_FUA)) { + if (ret == 0 && emulate_fua) { ret = bdrv_co_flush(bs); } @@ -1487,11 +1486,14 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child, max_transfer = QEMU_ALIGN_DOWN(MIN_NON_ZERO(bs->bl.max_transfer, INT_MAX), align); - /* TODO: We would need a per-BDS .supported_read_flags and + /* + * TODO: We would need a per-BDS .supported_read_flags and * potential fallback support, if we ever implement any read flags * to pass through to drivers. For now, there aren't any - * passthrough flags. */ - assert(!(flags & ~(BDRV_REQ_COPY_ON_READ | BDRV_REQ_PREFETCH))); + * passthrough flags except the BDRV_REQ_REGISTERED_BUF optimization hint. + */ + assert(!(flags & ~(BDRV_REQ_COPY_ON_READ | BDRV_REQ_PREFETCH | + BDRV_REQ_REGISTERED_BUF))); /* Handle Copy on Read and associated serialisation */ if (flags & BDRV_REQ_COPY_ON_READ) { @@ -1532,7 +1534,7 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child, goto out; } - assert(!(flags & ~bs->supported_read_flags)); + assert(!(flags & ~(bs->supported_read_flags | BDRV_REQ_REGISTERED_BUF))); max_bytes = ROUND_UP(MAX(0, total_bytes - offset), align); if (bytes <= max_bytes && bytes <= max_transfer) { @@ -1721,7 +1723,8 @@ static void bdrv_padding_destroy(BdrvRequestPadding *pad) static int bdrv_pad_request(BlockDriverState *bs, QEMUIOVector **qiov, size_t *qiov_offset, int64_t *offset, int64_t *bytes, - BdrvRequestPadding *pad, bool *padded) + BdrvRequestPadding *pad, bool *padded, + BdrvRequestFlags *flags) { int ret; @@ -1749,6 +1752,10 @@ static int bdrv_pad_request(BlockDriverState *bs, if (padded) { *padded = true; } + if (flags) { + /* Can't use optimization hint with bounce buffer */ + *flags &= ~BDRV_REQ_REGISTERED_BUF; + } return 0; } @@ -1803,7 +1810,7 @@ int coroutine_fn bdrv_co_preadv_part(BdrvChild *child, } ret = bdrv_pad_request(bs, &qiov, &qiov_offset, &offset, &bytes, &pad, - NULL); + NULL, &flags); if (ret < 0) { goto fail; } @@ -1848,6 +1855,11 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs, return -ENOTSUP; } + /* By definition there is no user buffer so this flag doesn't make sense */ + if (flags & BDRV_REQ_REGISTERED_BUF) { + return -EINVAL; + } + /* Invalidate the cached block-status data range if this write overlaps */ bdrv_bsc_invalidate_range(bs, offset, bytes); @@ -2133,6 +2145,9 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BdrvChild *child, bool padding; BdrvRequestPadding pad; + /* This flag doesn't make sense for padding or zero writes */ + flags &= ~BDRV_REQ_REGISTERED_BUF; + padding = bdrv_init_padding(bs, offset, bytes, &pad); if (padding) { assert(!(flags & BDRV_REQ_NO_WAIT)); @@ -2250,7 +2265,7 @@ int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child, * alignment only if there is no ZERO flag. */ ret = bdrv_pad_request(bs, &qiov, &qiov_offset, &offset, &bytes, &pad, - &padded); + &padded, &flags); if (ret < 0) { return ret; } @@ -3262,29 +3277,57 @@ void bdrv_io_unplug(BlockDriverState *bs) } } -void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size) +/* Helper that undoes bdrv_register_buf() when it fails partway through */ +static void bdrv_register_buf_rollback(BlockDriverState *bs, + void *host, + size_t size, + BdrvChild *final_child) +{ + BdrvChild *child; + + QLIST_FOREACH(child, &bs->children, next) { + if (child == final_child) { + break; + } + + bdrv_unregister_buf(child->bs, host, size); + } + + if (bs->drv && bs->drv->bdrv_unregister_buf) { + bs->drv->bdrv_unregister_buf(bs, host, size); + } +} + +bool bdrv_register_buf(BlockDriverState *bs, void *host, size_t size, + Error **errp) { BdrvChild *child; GLOBAL_STATE_CODE(); if (bs->drv && bs->drv->bdrv_register_buf) { - bs->drv->bdrv_register_buf(bs, host, size); + if (!bs->drv->bdrv_register_buf(bs, host, size, errp)) { + return false; + } } QLIST_FOREACH(child, &bs->children, next) { - bdrv_register_buf(child->bs, host, size); + if (!bdrv_register_buf(child->bs, host, size, errp)) { + bdrv_register_buf_rollback(bs, host, size, child); + return false; + } } + return true; } -void bdrv_unregister_buf(BlockDriverState *bs, void *host) +void bdrv_unregister_buf(BlockDriverState *bs, void *host, size_t size) { BdrvChild *child; GLOBAL_STATE_CODE(); if (bs->drv && bs->drv->bdrv_unregister_buf) { - bs->drv->bdrv_unregister_buf(bs, host); + bs->drv->bdrv_unregister_buf(bs, host, size); } QLIST_FOREACH(child, &bs->children, next) { - bdrv_unregister_buf(child->bs, host); + bdrv_unregister_buf(child->bs, host, size); } } diff --git a/block/meson.build b/block/meson.build index 60bc305597..b7c68b83a3 100644 --- a/block/meson.build +++ b/block/meson.build @@ -46,6 +46,7 @@ block_ss.add(files( ), zstd, zlib, gnutls) softmmu_ss.add(when: 'CONFIG_TCG', if_true: files('blkreplay.c')) +softmmu_ss.add(files('block-ram-registrar.c')) if get_option('qcow1').allowed() block_ss.add(files('qcow.c')) @@ -92,6 +93,7 @@ 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/block/mirror.c b/block/mirror.c index 80c0109d39..bed089d2e0 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -1486,6 +1486,8 @@ static int coroutine_fn bdrv_mirror_top_pwritev(BlockDriverState *bs, qemu_iovec_init(&bounce_qiov, 1); qemu_iovec_add(&bounce_qiov, bounce_buf, bytes); qiov = &bounce_qiov; + + flags &= ~BDRV_REQ_REGISTERED_BUF; } ret = bdrv_mirror_top_do_write(bs, MIRROR_METHOD_COPY, offset, bytes, qiov, diff --git a/block/nbd.c b/block/nbd.c index 494b9d683e..7d485c86d2 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -1222,7 +1222,6 @@ static int coroutine_fn nbd_client_co_preadv(BlockDriverState *bs, int64_t offse }; assert(bytes <= NBD_MAX_BUFFER_SIZE); - assert(!flags); if (!bytes) { return 0; diff --git a/block/nvme.c b/block/nvme.c index 2b24f95164..656624c585 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -1587,22 +1587,22 @@ static void nvme_aio_unplug(BlockDriverState *bs) } } -static void nvme_register_buf(BlockDriverState *bs, void *host, size_t size) +static bool nvme_register_buf(BlockDriverState *bs, void *host, size_t size, + Error **errp) { int ret; - Error *local_err = NULL; BDRVNVMeState *s = bs->opaque; - ret = qemu_vfio_dma_map(s->vfio, host, size, false, NULL, &local_err); - if (ret) { - /* FIXME: we may run out of IOVA addresses after repeated - * bdrv_register_buf/bdrv_unregister_buf, because nvme_vfio_dma_unmap - * doesn't reclaim addresses for fixed mappings. */ - error_reportf_err(local_err, "nvme_register_buf failed: "); - } + /* + * FIXME: we may run out of IOVA addresses after repeated + * bdrv_register_buf/bdrv_unregister_buf, because nvme_vfio_dma_unmap + * doesn't reclaim addresses for fixed mappings. + */ + ret = qemu_vfio_dma_map(s->vfio, host, size, false, NULL, errp); + return ret == 0; } -static void nvme_unregister_buf(BlockDriverState *bs, void *host) +static void nvme_unregister_buf(BlockDriverState *bs, void *host, size_t size) { BDRVNVMeState *s = bs->opaque; diff --git a/block/parallels.c b/block/parallels.c index c1523e7dab..dd15a44100 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -329,7 +329,6 @@ static coroutine_fn int parallels_co_writev(BlockDriverState *bs, QEMUIOVector hd_qiov; int ret = 0; - assert(!flags); qemu_iovec_init(&hd_qiov, qiov->niov); while (nb_sectors > 0) { diff --git a/block/qcow.c b/block/qcow.c index 311aaa8705..e9180c7b61 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -628,7 +628,6 @@ static coroutine_fn int qcow_co_preadv(BlockDriverState *bs, int64_t offset, uint8_t *buf; void *orig_buf; - assert(!flags); if (qiov->niov > 1) { buf = orig_buf = qemu_try_blockalign(bs, qiov->size); if (buf == NULL) { @@ -725,7 +724,6 @@ static coroutine_fn int qcow_co_pwritev(BlockDriverState *bs, int64_t offset, uint8_t *buf; void *orig_buf; - assert(!flags); s->cluster_cache_offset = -1; /* disable compressed cache */ /* We must always copy the iov when encrypting, so we diff --git a/block/qed.c b/block/qed.c index bda00e6257..99a9ec9b57 100644 --- a/block/qed.c +++ b/block/qed.c @@ -1395,7 +1395,6 @@ static int coroutine_fn bdrv_qed_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, int flags) { - assert(!flags); return qed_co_request(bs, sector_num, qiov, nb_sectors, QED_AIOCB_WRITE); } diff --git a/block/raw-format.c b/block/raw-format.c index f337ac7569..c8dc9bc850 100644 --- a/block/raw-format.c +++ b/block/raw-format.c @@ -258,6 +258,8 @@ static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, int64_t offset, qemu_iovec_add(&local_qiov, buf, 512); qemu_iovec_concat(&local_qiov, qiov, 512, qiov->size - 512); qiov = &local_qiov; + + flags &= ~BDRV_REQ_REGISTERED_BUF; } ret = raw_adjust_offset(bs, &offset, bytes, true); diff --git a/block/replication.c b/block/replication.c index c67f931f37..13f1d39571 100644 --- a/block/replication.c +++ b/block/replication.c @@ -261,7 +261,6 @@ static coroutine_fn int replication_co_writev(BlockDriverState *bs, int ret; int64_t n; - assert(!flags); ret = replication_get_io_status(s); if (ret < 0) { goto out; diff --git a/block/ssh.c b/block/ssh.c index a2dc646536..a3cddc392c 100644 --- a/block/ssh.c +++ b/block/ssh.c @@ -1196,7 +1196,6 @@ static coroutine_fn int ssh_co_writev(BlockDriverState *bs, BDRVSSHState *s = bs->opaque; int ret; - assert(!flags); qemu_co_mutex_lock(&s->lock); ret = ssh_write(s, bs, sector_num * BDRV_SECTOR_SIZE, nb_sectors * BDRV_SECTOR_SIZE, qiov); diff --git a/block/vhdx.c b/block/vhdx.c index e10e78ebfd..e2344ee0b7 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -1342,7 +1342,6 @@ static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num, uint64_t bat_prior_offset = 0; bool bat_update = false; - assert(!flags); qemu_iovec_init(&hd_qiov, qiov->niov); qemu_co_mutex_lock(&s->lock); diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 8131ec2dbc..f717550fdc 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -21,6 +21,7 @@ #include "hw/block/block.h" #include "hw/qdev-properties.h" #include "sysemu/blockdev.h" +#include "sysemu/block-ram-registrar.h" #include "sysemu/sysemu.h" #include "sysemu/runstate.h" #include "hw/virtio/virtio-blk.h" @@ -362,12 +363,14 @@ static void virtio_blk_handle_scsi(VirtIOBlockReq *req) } } -static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb, +static inline void submit_requests(VirtIOBlock *s, MultiReqBuffer *mrb, int start, int num_reqs, int niov) { + BlockBackend *blk = s->blk; QEMUIOVector *qiov = &mrb->reqs[start]->qiov; int64_t sector_num = mrb->reqs[start]->sector_num; bool is_write = mrb->is_write; + BdrvRequestFlags flags = 0; if (num_reqs > 1) { int i; @@ -398,12 +401,18 @@ static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb, num_reqs - 1); } + if (blk_ram_registrar_ok(&s->blk_ram_registrar)) { + flags |= BDRV_REQ_REGISTERED_BUF; + } + if (is_write) { - blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0, - virtio_blk_rw_complete, mrb->reqs[start]); + blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, + flags, virtio_blk_rw_complete, + mrb->reqs[start]); } else { - blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0, - virtio_blk_rw_complete, mrb->reqs[start]); + blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, + flags, virtio_blk_rw_complete, + mrb->reqs[start]); } } @@ -425,14 +434,14 @@ static int multireq_compare(const void *a, const void *b) } } -static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb) +static void virtio_blk_submit_multireq(VirtIOBlock *s, MultiReqBuffer *mrb) { int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0; uint32_t max_transfer; int64_t sector_num = 0; if (mrb->num_reqs == 1) { - submit_requests(blk, mrb, 0, 1, -1); + submit_requests(s, mrb, 0, 1, -1); mrb->num_reqs = 0; return; } @@ -452,11 +461,11 @@ static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb) * 3. merge would exceed maximum transfer length of backend device */ if (sector_num + nb_sectors != req->sector_num || - niov > blk_get_max_iov(blk) - req->qiov.niov || + niov > blk_get_max_iov(s->blk) - req->qiov.niov || req->qiov.size > max_transfer || nb_sectors > (max_transfer - req->qiov.size) / BDRV_SECTOR_SIZE) { - submit_requests(blk, mrb, start, num_reqs, niov); + submit_requests(s, mrb, start, num_reqs, niov); num_reqs = 0; } } @@ -472,7 +481,7 @@ static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb) num_reqs++; } - submit_requests(blk, mrb, start, num_reqs, niov); + submit_requests(s, mrb, start, num_reqs, niov); mrb->num_reqs = 0; } @@ -487,7 +496,7 @@ static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) * Make sure all outstanding writes are posted to the backing device. */ if (mrb->is_write && mrb->num_reqs > 0) { - virtio_blk_submit_multireq(s->blk, mrb); + virtio_blk_submit_multireq(s, mrb); } blk_aio_flush(s->blk, virtio_blk_flush_complete, req); } @@ -667,7 +676,7 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS || is_write != mrb->is_write || !s->conf.request_merging)) { - virtio_blk_submit_multireq(s->blk, mrb); + virtio_blk_submit_multireq(s, mrb); } assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS); @@ -774,7 +783,7 @@ void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq) } while (!virtio_queue_empty(vq)); if (mrb.num_reqs) { - virtio_blk_submit_multireq(s->blk, &mrb); + virtio_blk_submit_multireq(s, &mrb); } blk_io_unplug(s->blk); @@ -823,7 +832,7 @@ void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh) } if (mrb.num_reqs) { - virtio_blk_submit_multireq(s->blk, &mrb); + virtio_blk_submit_multireq(s, &mrb); } if (is_bh) { blk_dec_in_flight(s->conf.conf.blk); @@ -1205,6 +1214,7 @@ 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_ram_registrar_init(&s->blk_ram_registrar, s->blk); blk_set_dev_ops(s->blk, &virtio_block_ops, s); blk_iostatus_enable(s->blk); @@ -1230,6 +1240,7 @@ static void virtio_blk_device_unrealize(DeviceState *dev) virtio_del_queue(vdev, i); } qemu_coroutine_dec_pool_size(conf->num_queues * conf->queue_size / 2); + blk_ram_registrar_destroy(&s->blk_ram_registrar); qemu_del_vm_change_state_handler(s->change); blockdev_mark_auto_del(s->blk); virtio_cleanup(vdev); diff --git a/hw/core/numa.c b/hw/core/numa.c index 26d8e5f616..ea24a5fa8c 100644 --- a/hw/core/numa.c +++ b/hw/core/numa.c @@ -822,6 +822,19 @@ static int ram_block_notify_add_single(RAMBlock *rb, void *opaque) return 0; } +static int ram_block_notify_remove_single(RAMBlock *rb, void *opaque) +{ + const ram_addr_t max_size = qemu_ram_get_max_length(rb); + const ram_addr_t size = qemu_ram_get_used_length(rb); + void *host = qemu_ram_get_host_addr(rb); + RAMBlockNotifier *notifier = opaque; + + if (host) { + notifier->ram_block_removed(notifier, host, size, max_size); + } + return 0; +} + void ram_block_notifier_add(RAMBlockNotifier *n) { QLIST_INSERT_HEAD(&ram_list.ramblock_notifiers, n, next); @@ -835,13 +848,18 @@ void ram_block_notifier_add(RAMBlockNotifier *n) void ram_block_notifier_remove(RAMBlockNotifier *n) { QLIST_REMOVE(n, next); + + if (n->ram_block_removed) { + qemu_ram_foreach_block(ram_block_notify_remove_single, n); + } } void ram_block_notify_add(void *host, size_t size, size_t max_size) { RAMBlockNotifier *notifier; + RAMBlockNotifier *next; - QLIST_FOREACH(notifier, &ram_list.ramblock_notifiers, next) { + QLIST_FOREACH_SAFE(notifier, &ram_list.ramblock_notifiers, next, next) { if (notifier->ram_block_added) { notifier->ram_block_added(notifier, host, size, max_size); } @@ -851,8 +869,9 @@ void ram_block_notify_add(void *host, size_t size, size_t max_size) void ram_block_notify_remove(void *host, size_t size, size_t max_size) { RAMBlockNotifier *notifier; + RAMBlockNotifier *next; - QLIST_FOREACH(notifier, &ram_list.ramblock_notifiers, next) { + QLIST_FOREACH_SAFE(notifier, &ram_list.ramblock_notifiers, next, next) { if (notifier->ram_block_removed) { notifier->ram_block_removed(notifier, host, size, max_size); } @@ -862,8 +881,9 @@ void ram_block_notify_remove(void *host, size_t size, size_t max_size) void ram_block_notify_resize(void *host, size_t old_size, size_t new_size) { RAMBlockNotifier *notifier; + RAMBlockNotifier *next; - QLIST_FOREACH(notifier, &ram_list.ramblock_notifiers, next) { + QLIST_FOREACH_SAFE(notifier, &ram_list.ramblock_notifiers, next, next) { if (notifier->ram_block_resized) { notifier->ram_block_resized(notifier, host, old_size, new_size); } diff --git a/include/block/block-common.h b/include/block/block-common.h index fdb7306e78..061606e867 100644 --- a/include/block/block-common.h +++ b/include/block/block-common.h @@ -80,6 +80,15 @@ typedef enum { */ BDRV_REQ_MAY_UNMAP = 0x4, + /* + * An optimization hint when all QEMUIOVector elements are within + * previously registered bdrv_register_buf() memory ranges. + * + * Code that replaces the user's QEMUIOVector elements with bounce buffers + * must take care to clear this flag. + */ + BDRV_REQ_REGISTERED_BUF = 0x8, + BDRV_REQ_FUA = 0x10, BDRV_REQ_WRITE_COMPRESSED = 0x20, diff --git a/include/block/block-global-state.h b/include/block/block-global-state.h index 21265e3966..eba4ed23b4 100644 --- a/include/block/block-global-state.h +++ b/include/block/block-global-state.h @@ -243,9 +243,15 @@ void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); * Register/unregister a buffer for I/O. For example, VFIO drivers are * interested to know the memory areas that would later be used for I/O, so * that they can prepare IOMMU mapping etc., to get better performance. + * + * Buffers must not overlap and they must be unregistered with the same <host, + * size> values that they were registered with. + * + * Returns: true on success, false on failure */ -void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size); -void bdrv_unregister_buf(BlockDriverState *bs, void *host); +bool bdrv_register_buf(BlockDriverState *bs, void *host, size_t size, + Error **errp); +void bdrv_unregister_buf(BlockDriverState *bs, void *host, size_t size); void bdrv_cancel_in_flight(BlockDriverState *bs); diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 8947abab76..9c569be162 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -433,9 +433,12 @@ struct BlockDriver { * that it can do IOMMU mapping with VFIO etc., in order to get better * performance. In the case of VFIO drivers, this callback is used to do * DMA mapping for hot buffers. + * + * Returns: true on success, false on failure */ - void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size); - void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host); + bool (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size, + Error **errp); + void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host, size_t size); /* * This field is modified only under the BQL, and is part of @@ -1051,7 +1054,7 @@ struct BlockDriverState { /* * Flags honored during pread */ - unsigned int supported_read_flags; + BdrvRequestFlags supported_read_flags; /* * Flags honored during pwrite (so far: BDRV_REQ_FUA, * BDRV_REQ_WRITE_UNCHANGED). @@ -1069,12 +1072,12 @@ struct BlockDriverState { * flag), or they have to explicitly take the WRITE permission for * their children. */ - unsigned int supported_write_flags; + BdrvRequestFlags supported_write_flags; /* * Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA, * BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */ - unsigned int supported_zero_flags; + BdrvRequestFlags supported_zero_flags; /* * Flags honoured during truncate (so far: BDRV_REQ_ZERO_WRITE). * @@ -1082,7 +1085,7 @@ struct BlockDriverState { * that any added space reads as all zeros. If this can't be guaranteed, * the operation must fail. */ - unsigned int supported_truncate_flags; + BdrvRequestFlags supported_truncate_flags; /* the following member gives a name to every node on the bs graph. */ char node_name[32]; diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index c493510ee9..6feaa40ca7 100644 --- a/include/exec/cpu-common.h +++ b/include/exec/cpu-common.h @@ -92,6 +92,7 @@ void qemu_ram_set_uf_zeroable(RAMBlock *rb); bool qemu_ram_is_migratable(RAMBlock *rb); void qemu_ram_set_migratable(RAMBlock *rb); void qemu_ram_unset_migratable(RAMBlock *rb); +int qemu_ram_get_fd(RAMBlock *rb); size_t qemu_ram_pagesize(RAMBlock *block); size_t qemu_ram_pagesize_largest(void); diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h index d311c57cca..7f589b4146 100644 --- a/include/hw/virtio/virtio-blk.h +++ b/include/hw/virtio/virtio-blk.h @@ -19,6 +19,7 @@ #include "hw/block/block.h" #include "sysemu/iothread.h" #include "sysemu/block-backend.h" +#include "sysemu/block-ram-registrar.h" #include "qom/object.h" #define TYPE_VIRTIO_BLK "virtio-blk-device" @@ -64,6 +65,7 @@ struct VirtIOBlock { struct VirtIOBlockDataPlane *dataplane; uint64_t host_features; size_t config_size; + BlockRAMRegistrar blk_ram_registrar; }; typedef struct VirtIOBlockReq { diff --git a/include/qemu/coroutine.h b/include/qemu/coroutine.h index aae33cce17..608fe45dcf 100644 --- a/include/qemu/coroutine.h +++ b/include/qemu/coroutine.h @@ -198,14 +198,25 @@ typedef struct CoQueue { */ void qemu_co_queue_init(CoQueue *queue); +typedef enum { + /* + * Enqueue at front instead of back. Use this to re-queue a request when + * its wait condition is not satisfied after being woken up. + */ + CO_QUEUE_WAIT_FRONT = 0x1, +} CoQueueWaitFlags; + /** * Adds the current coroutine to the CoQueue and transfers control to the * caller of the coroutine. The mutex is unlocked during the wait and * locked again afterwards. */ #define qemu_co_queue_wait(queue, lock) \ - qemu_co_queue_wait_impl(queue, QEMU_MAKE_LOCKABLE(lock)) -void coroutine_fn qemu_co_queue_wait_impl(CoQueue *queue, QemuLockable *lock); + qemu_co_queue_wait_impl(queue, QEMU_MAKE_LOCKABLE(lock), 0) +#define qemu_co_queue_wait_flags(queue, lock, flags) \ + qemu_co_queue_wait_impl(queue, QEMU_MAKE_LOCKABLE(lock), (flags)) +void coroutine_fn qemu_co_queue_wait_impl(CoQueue *queue, QemuLockable *lock, + CoQueueWaitFlags flags); /** * Removes the next coroutine from the CoQueue, and queue it to run after diff --git a/include/sysemu/block-backend-global-state.h b/include/sysemu/block-backend-global-state.h index 415f0c91d7..6858e39cb6 100644 --- a/include/sysemu/block-backend-global-state.h +++ b/include/sysemu/block-backend-global-state.h @@ -106,8 +106,8 @@ void blk_io_limits_enable(BlockBackend *blk, const char *group); void blk_io_limits_update_group(BlockBackend *blk, const char *group); void blk_set_force_allow_inactivate(BlockBackend *blk); -void blk_register_buf(BlockBackend *blk, void *host, size_t size); -void blk_unregister_buf(BlockBackend *blk, void *host); +bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp); +void blk_unregister_buf(BlockBackend *blk, void *host, size_t size); const BdrvChild *blk_root(BlockBackend *blk); diff --git a/include/sysemu/block-ram-registrar.h b/include/sysemu/block-ram-registrar.h new file mode 100644 index 0000000000..d8b2f7942b --- /dev/null +++ b/include/sysemu/block-ram-registrar.h @@ -0,0 +1,37 @@ +/* + * BlockBackend RAM Registrar + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#ifndef BLOCK_RAM_REGISTRAR_H +#define BLOCK_RAM_REGISTRAR_H + +#include "exec/ramlist.h" + +/** + * struct BlockRAMRegistrar: + * + * Keeps RAMBlock memory registered with a BlockBackend using + * blk_register_buf() including hotplugged memory. + * + * Emulated devices or other BlockBackend users initialize a BlockRAMRegistrar + * with blk_ram_registrar_init() before submitting I/O requests with the + * BDRV_REQ_REGISTERED_BUF flag set. + */ +typedef struct { + BlockBackend *blk; + RAMBlockNotifier notifier; + bool ok; +} BlockRAMRegistrar; + +void blk_ram_registrar_init(BlockRAMRegistrar *r, BlockBackend *blk); +void blk_ram_registrar_destroy(BlockRAMRegistrar *r); + +/* Have all RAMBlocks been registered successfully? */ +static inline bool blk_ram_registrar_ok(BlockRAMRegistrar *r) +{ + return r->ok; +} + +#endif /* BLOCK_RAM_REGISTRAR_H */ diff --git a/meson.build b/meson.build index 71fe72ea06..37737913df 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/qemu-img.c b/qemu-img.c index ace3adf8ae..a3b64c88af 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -4371,7 +4371,7 @@ static int img_bench(int argc, char **argv) struct timeval t1, t2; int i; bool force_share = false; - size_t buf_size; + size_t buf_size = 0; for (;;) { static const struct option long_options[] = { @@ -4570,7 +4570,7 @@ static int img_bench(int argc, char **argv) data.buf = blk_blockalign(blk, buf_size); memset(data.buf, pattern, data.nrreq * data.bufsize); - blk_register_buf(blk, data.buf, buf_size); + blk_register_buf(blk, data.buf, buf_size, &error_fatal); data.qiov = g_new(QEMUIOVector, data.nrreq); for (i = 0; i < data.nrreq; i++) { @@ -4593,7 +4593,7 @@ static int img_bench(int argc, char **argv) out: if (data.buf) { - blk_unregister_buf(blk, data.buf); + blk_unregister_buf(blk, data.buf, buf_size); } qemu_vfree(data.buf); blk_unref(blk); 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/softmmu/physmem.c b/softmmu/physmem.c index 56e03e07b5..d9578ccfd4 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -1748,6 +1748,11 @@ void qemu_ram_unset_migratable(RAMBlock *rb) rb->flags &= ~RAM_MIGRATABLE; } +int qemu_ram_get_fd(RAMBlock *rb) +{ + return rb->fd; +} + /* Called with iothread lock held. */ void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev) { diff --git a/stubs/meson.build b/stubs/meson.build index d8f3fd5c44..4314161f5f 100644 --- a/stubs/meson.build +++ b/stubs/meson.build @@ -29,6 +29,7 @@ stub_ss.add(files('migr-blocker.c')) stub_ss.add(files('module-opts.c')) stub_ss.add(files('monitor.c')) stub_ss.add(files('monitor-core.c')) +stub_ss.add(files('physmem.c')) stub_ss.add(files('qemu-timer-notify-cb.c')) stub_ss.add(files('qmp_memory_device.c')) stub_ss.add(files('qmp-command-available.c')) diff --git a/stubs/physmem.c b/stubs/physmem.c new file mode 100644 index 0000000000..1fc5f2df29 --- /dev/null +++ b/stubs/physmem.c @@ -0,0 +1,13 @@ +#include "qemu/osdep.h" +#include "exec/cpu-common.h" + +RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset, + ram_addr_t *offset) +{ + return NULL; +} + +int qemu_ram_get_fd(RAMBlock *rb) +{ + return -1; +} 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 diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c index 15c82d9348..45c6b57374 100644 --- a/util/qemu-coroutine-lock.c +++ b/util/qemu-coroutine-lock.c @@ -39,10 +39,15 @@ void qemu_co_queue_init(CoQueue *queue) QSIMPLEQ_INIT(&queue->entries); } -void coroutine_fn qemu_co_queue_wait_impl(CoQueue *queue, QemuLockable *lock) +void coroutine_fn qemu_co_queue_wait_impl(CoQueue *queue, QemuLockable *lock, + CoQueueWaitFlags flags) { Coroutine *self = qemu_coroutine_self(); - QSIMPLEQ_INSERT_TAIL(&queue->entries, self, co_queue_next); + if (flags & CO_QUEUE_WAIT_FRONT) { + QSIMPLEQ_INSERT_HEAD(&queue->entries, self, co_queue_next); + } else { + QSIMPLEQ_INSERT_TAIL(&queue->entries, self, co_queue_next); + } if (lock) { qemu_lockable_unlock(lock); diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 5ba01177bf..0d1520caac 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -847,10 +847,13 @@ void qemu_vfio_close(QEMUVFIOState *s) if (!s) { return; } + + ram_block_notifier_remove(&s->ram_notifier); + for (i = 0; i < s->nr_mappings; ++i) { qemu_vfio_undo_mapping(s, &s->mappings[i], NULL); } - ram_block_notifier_remove(&s->ram_notifier); + g_free(s->usable_iova_ranges); s->nb_iova_ranges = 0; qemu_vfio_reset(s); |