From patchwork Tue Apr 5 15:33:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613492 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=KGCIX3fi; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4KXsBp5Xdkz9s07 for ; Wed, 6 Apr 2022 01:34:26 +1000 (AEST) Received: from localhost ([::1]:41702 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nblCK-0008Hv-M3 for incoming@patchwork.ozlabs.org; Tue, 05 Apr 2022 11:34:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53236) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nblBW-0008FH-Ch for qemu-devel@nongnu.org; Tue, 05 Apr 2022 11:33:34 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:59096) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nblBT-0003v4-Hz for qemu-devel@nongnu.org; Tue, 05 Apr 2022 11:33:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649172810; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xcHV342QJs4RVOnHADxhG7Bn5RrMMjKHp5dHZ6URPI4=; b=KGCIX3fiApp+DO9gWJHrA+KQzYERGy2r9W32N3341VegfM3Uq9dHY4K7PM4n4j4bE+cGNN Vv6tqSb96fT2zrGOWLshyKn8/FHFaBEozJGTbyjzJ8lRlzA4bFsFIPap996DVjbRC2fjLp zTIzxee42Ua3GngLr44yD+LbcUwZJQs= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-435-5lms0pYWNPGtvXWv0u7Kxg-1; Tue, 05 Apr 2022 11:33:28 -0400 X-MC-Unique: 5lms0pYWNPGtvXWv0u7Kxg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 657DA3C11A16; Tue, 5 Apr 2022 15:33:27 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id A0DA740CF8E5; Tue, 5 Apr 2022 15:33:26 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 1/8] blkio: add io_uring block driver using libblkio Date: Tue, 5 Apr 2022 16:33:16 +0100 Message-Id: <20220405153323.2082242-2-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" libblkio (https://gitlab.com/libblkio/libblkio/) is a library for high-performance disk I/O. It currently supports io_uring with additional drivers planned. One of the reasons for developing libblkio is that other applications besides QEMU can use it. This will be particularly useful for vhost-user-blk which applications may wish to use for connecting to qemu-storage-daemon. libblkio also gives us an opportunity to develop in Rust behind a C API that is easy to consume from QEMU. This commit adds an io_uring BlockDriver to QEMU using libblkio. For now I/O buffers are copied through bounce buffers if the libblkio driver requires it. Later commits add an optimization for pre-registering guest RAM to avoid bounce buffers. It will be easy to add other libblkio drivers since they will share the majority of code. Signed-off-by: Stefan Hajnoczi --- MAINTAINERS | 6 + meson_options.txt | 2 + qapi/block-core.json | 18 +- meson.build | 9 + block/blkio.c | 537 ++++++++++++++++++++++++++++++++++ tests/qtest/modules-test.c | 3 + block/meson.build | 1 + scripts/meson-buildoptions.sh | 3 + 8 files changed, 578 insertions(+), 1 deletion(-) create mode 100644 block/blkio.c diff --git a/MAINTAINERS b/MAINTAINERS index 4ad2451e03..d839301f68 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3349,6 +3349,12 @@ L: qemu-block@nongnu.org S: Maintained F: block/vdi.c +blkio +M: Stefan Hajnoczi +L: qemu-block@nongnu.org +S: Maintained +F: block/blkio.c + iSCSI M: Ronnie Sahlberg M: Paolo Bonzini diff --git a/meson_options.txt b/meson_options.txt index 52b11cead4..1e82e770e7 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -101,6 +101,8 @@ 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 4a7a6940a3..c04e1e325b 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2924,7 +2924,9 @@ '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', + 'http', 'https', + { 'name': 'io_uring', 'if': 'CONFIG_BLKIO' }, + 'iscsi', 'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels', 'preallocate', 'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd', { 'name': 'replication', 'if': 'CONFIG_REPLICATION' }, @@ -3656,6 +3658,18 @@ '*debug': 'int', '*logfile': 'str' } } +## +# @BlockdevOptionsIoUring: +# +# Driver specific block device options for the io_uring backend. +# +# @filename: path to the image file +# +# Since: 6.3 +## +{ 'struct': 'BlockdevOptionsIoUring', + 'data': { 'filename': 'str' } } + ## # @IscsiTransport: # @@ -4254,6 +4268,8 @@ 'if': 'HAVE_HOST_BLOCK_DEVICE' }, 'http': 'BlockdevOptionsCurlHttp', 'https': 'BlockdevOptionsCurlHttps', + 'io_uring': { 'type': 'BlockdevOptionsIoUring', + 'if': 'CONFIG_BLKIO' }, 'iscsi': 'BlockdevOptionsIscsi', 'luks': 'BlockdevOptionsLUKS', 'nbd': 'BlockdevOptionsNbd', diff --git a/meson.build b/meson.build index 861de93c4f..0ab17c8767 100644 --- a/meson.build +++ b/meson.build @@ -636,6 +636,13 @@ 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', @@ -1519,6 +1526,7 @@ 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()) @@ -3672,6 +3680,7 @@ 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 += {'VNC support': vnc} diff --git a/block/blkio.c b/block/blkio.c new file mode 100644 index 0000000000..562e972003 --- /dev/null +++ b/block/blkio.c @@ -0,0 +1,537 @@ +#include "qemu/osdep.h" +#include +#include "block/block_int.h" +#include "qapi/error.h" +#include "qapi/qmp/qdict.h" +#include "qemu/module.h" + +typedef struct BlkAIOCB { + BlockAIOCB common; + struct blkio_mem_region mem_region; + QEMUIOVector qiov; + struct iovec bounce_iov; +} BlkioAIOCB; + +typedef struct { + /* Protects ->blkio and request submission on ->blkioq */ + QemuMutex lock; + + struct blkio *blkio; + struct blkioq *blkioq; /* this could be multi-queue in the future */ + int completion_fd; + + /* 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; + +static void blkio_aiocb_complete(BlkioAIOCB *acb, int ret) +{ + /* Copy bounce buffer back to qiov */ + if (acb->qiov.niov > 0) { + qemu_iovec_from_buf(&acb->qiov, 0, + acb->bounce_iov.iov_base, + acb->bounce_iov.iov_len); + qemu_iovec_destroy(&acb->qiov); + } + + acb->common.cb(acb->common.opaque, ret); + + if (acb->mem_region.len > 0) { + BDRVBlkioState *s = acb->common.bs->opaque; + + WITH_QEMU_LOCK_GUARD(&s->lock) { + blkio_free_mem_region(s->blkio, &acb->mem_region); + } + } + + qemu_aio_unref(&acb->common); +} + +/* + * Only the thread that calls aio_poll() invokes fd and poll handlers. + * Therefore locks are not necessary except when accessing s->blkio. + * + * No locking is performed around blkioq_get_completions() although other + * threads may submit I/O requests on s->blkioq. We're assuming there is no + * inteference between blkioq_get_completions() and other s->blkioq APIs. + */ + +static void blkio_completion_fd_read(void *opaque) +{ + BlockDriverState *bs = opaque; + BDRVBlkioState *s = bs->opaque; + struct blkio_completion completion; + uint64_t val; + ssize_t ret __attribute__((unused)); + + /* Reset completion fd status */ + ret = read(s->completion_fd, &val, sizeof(val)); + + /* + * 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 (blkioq_get_completions(s->blkioq, &completion, 1) == 1) { + blkio_aiocb_complete(completion.user_data, completion.ret); + } +} + +static bool blkio_completion_fd_poll(void *opaque) +{ + BlockDriverState *bs = opaque; + BDRVBlkioState *s = bs->opaque; + + return blkioq_get_num_completions(s->blkioq) > 0; +} + +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); +} + +static const AIOCBInfo blkio_aiocb_info = { + .aiocb_size = sizeof(BlkioAIOCB), +}; + +/* Create a BlkioAIOCB */ +static BlkioAIOCB *blkio_aiocb_get(BlockDriverState *bs, + BlockCompletionFunc *cb, + void *opaque) +{ + BlkioAIOCB *acb = qemu_aio_get(&blkio_aiocb_info, bs, cb, opaque); + + /* A few fields need to be initialized, leave the rest... */ + acb->qiov.niov = 0; + acb->mem_region.len = 0; + return acb; +} + +/* s->lock must be held */ +static int blkio_aiocb_init_mem_region_locked(BlkioAIOCB *acb, size_t len) +{ + BDRVBlkioState *s = acb->common.bs->opaque; + size_t mem_region_len = QEMU_ALIGN_UP(len, s->mem_region_alignment); + int ret; + + ret = blkio_alloc_mem_region(s->blkio, &acb->mem_region, + mem_region_len, 0); + if (ret < 0) { + return ret; + } + + acb->bounce_iov.iov_base = acb->mem_region.addr; + acb->bounce_iov.iov_len = len; + return 0; +} + +static BlockAIOCB *blkio_aio_preadv(BlockDriverState *bs, int64_t offset, + int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque) +{ + BDRVBlkioState *s = bs->opaque; + struct iovec *iov = qiov->iov; + int iovcnt = qiov->niov; + BlkioAIOCB *acb; + int ret; + + QEMU_LOCK_GUARD(&s->lock); + + acb = blkio_aiocb_get(bs, cb, opaque); + + if (s->needs_mem_regions) { + if (blkio_aiocb_init_mem_region_locked(acb, bytes) < 0) { + qemu_aio_unref(&acb->common); + return NULL; + } + + /* Copy qiov because we'll call qemu_iovec_from_buf() on completion */ + qemu_iovec_init_slice(&acb->qiov, qiov, 0, qiov->size); + + iov = &acb->bounce_iov; + iovcnt = 1; + } + + ret = blkioq_readv(s->blkioq, offset, iov, iovcnt, acb, 0); + if (ret < 0) { + if (s->needs_mem_regions) { + blkio_free_mem_region(s->blkio, &acb->mem_region); + qemu_iovec_destroy(&acb->qiov); + } + qemu_aio_unref(&acb->common); + return NULL; + } + + if (qatomic_read(&bs->io_plugged) == 0) { + blkioq_submit_and_wait(s->blkioq, 0, NULL, NULL); + } + + return &acb->common; +} + +static BlockAIOCB *blkio_aio_pwritev(BlockDriverState *bs, int64_t offset, + int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque) +{ + uint32_t blkio_flags = (flags & BDRV_REQ_FUA) ? BLKIO_REQ_FUA : 0; + BDRVBlkioState *s = bs->opaque; + struct iovec *iov = qiov->iov; + int iovcnt = qiov->niov; + BlkioAIOCB *acb; + int ret; + + QEMU_LOCK_GUARD(&s->lock); + + acb = blkio_aiocb_get(bs, cb, opaque); + + if (s->needs_mem_regions) { + if (blkio_aiocb_init_mem_region_locked(acb, bytes) < 0) { + qemu_aio_unref(&acb->common); + return NULL; + } + + qemu_iovec_to_buf(qiov, 0, acb->bounce_iov.iov_base, bytes); + + iov = &acb->bounce_iov; + iovcnt = 1; + } + + ret = blkioq_writev(s->blkioq, offset, iov, iovcnt, acb, blkio_flags); + if (ret < 0) { + if (s->needs_mem_regions) { + blkio_free_mem_region(s->blkio, &acb->mem_region); + } + qemu_aio_unref(&acb->common); + return NULL; + } + + if (qatomic_read(&bs->io_plugged) == 0) { + blkioq_submit_and_wait(s->blkioq, 0, NULL, NULL); + } + + return &acb->common; +} + +static BlockAIOCB *blkio_aio_flush(BlockDriverState *bs, + BlockCompletionFunc *cb, + void *opaque) +{ + BDRVBlkioState *s = bs->opaque; + BlkioAIOCB *acb; + int ret; + + QEMU_LOCK_GUARD(&s->lock); + + acb = blkio_aiocb_get(bs, cb, opaque); + + ret = blkioq_flush(s->blkioq, acb, 0); + if (ret < 0) { + qemu_aio_unref(&acb->common); + return NULL; + } + + if (qatomic_read(&bs->io_plugged) == 0) { + blkioq_submit_and_wait(s->blkioq, 0, NULL, NULL); + } + + return &acb->common; +} + +static void blkio_io_unplug(BlockDriverState *bs) +{ + BDRVBlkioState *s = bs->opaque; + + WITH_QEMU_LOCK_GUARD(&s->lock) { + blkioq_submit_and_wait(s->blkioq, 0, NULL, NULL); + } +} + +static void blkio_parse_filename_io_uring(const char *filename, QDict *options, + Error **errp) +{ + bdrv_parse_filename_strip_prefix(filename, "io_uring:", options); +} + +static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, + Error **errp) +{ + const char *filename = qdict_get_try_str(options, "filename"); + 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; + } + + ret = blkio_set_str(s->blkio, "path", filename); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set path: %s", + blkio_get_error_msg()); + blkio_destroy(&s->blkio); + 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()); + blkio_destroy(&s->blkio); + return ret; + } + } + + if (!(flags & BDRV_O_RDWR)) { + ret = blkio_set_bool(s->blkio, "readonly", true); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to set readonly: %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; + + qemu_mutex_init(&s->lock); + 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)); + + qdict_del(options, "filename"); + return 0; +} + +static void blkio_close(BlockDriverState *bs) +{ + BDRVBlkioState *s = bs->opaque; + + qemu_mutex_destroy(&s->lock); + 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->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; + int value; + int ret; + + ret = blkio_get_int(s->blkio, + "buf-alignment", + (int *)&bs->bl.request_alignment); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"buf-alignment\": %s", + blkio_get_error_msg()); + return; + } + if (bs->bl.request_alignment < 1 || + bs->bl.request_alignment >= INT_MAX || + !is_power_of_2(bs->bl.request_alignment)) { + error_setg(errp, "invalid \"buf-alignment\" value %d, must be power " + "of 2 less than INT_MAX", bs->bl.request_alignment); + return; + } + + ret = blkio_get_int(s->blkio, + "optimal-io-size", + (int *)&bs->bl.opt_transfer); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"buf-alignment\": %s", + blkio_get_error_msg()); + return; + } + if (bs->bl.opt_transfer > INT_MAX || + (bs->bl.opt_transfer % bs->bl.request_alignment)) { + error_setg(errp, "invalid \"buf-alignment\" value %d, must be a " + "multiple of %d", bs->bl.opt_transfer, + bs->bl.request_alignment); + return; + } + + ret = blkio_get_int(s->blkio, + "max-transfer", + (int *)&bs->bl.max_transfer); + if (ret < 0) { + error_setg_errno(errp, -ret, "failed to get \"max-transfer\": %s", + blkio_get_error_msg()); + return; + } + 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 %d, must be a " + "multiple of %d and %d (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", &bs->bl.max_iov); + 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", + bs->bl.max_iov); + return; + } +} + +static BlockDriver bdrv_io_uring = { + .format_name = "io_uring", + .protocol_name = "io_uring", + .instance_size = sizeof(BDRVBlkioState), + .bdrv_needs_filename = true, + .bdrv_parse_filename = blkio_parse_filename_io_uring, + .bdrv_file_open = blkio_file_open, + .bdrv_close = blkio_close, + .bdrv_getlength = blkio_getlength, + .has_variable_length = true, + .bdrv_get_info = blkio_get_info, + .bdrv_attach_aio_context = blkio_attach_aio_context, + .bdrv_detach_aio_context = blkio_detach_aio_context, + .bdrv_aio_preadv = blkio_aio_preadv, + .bdrv_aio_pwritev = blkio_aio_pwritev, + .bdrv_aio_flush = blkio_aio_flush, + .bdrv_io_unplug = blkio_io_unplug, + .bdrv_refresh_limits = blkio_refresh_limits, + + /* + * TODO + * Missing libblkio APIs: + * - write zeroes + * - discard + * - block_status + * - co_invalidate_cache + * + * Out of scope? + * - create + * - truncate + */ +}; + +static void bdrv_blkio_init(void) +{ + bdrv_register(&bdrv_io_uring); +} + +block_init(bdrv_blkio_init); diff --git a/tests/qtest/modules-test.c b/tests/qtest/modules-test.c index c238b3f422..2e0f73fdc6 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/block/meson.build b/block/meson.build index 0b2a60c99b..787667384a 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/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh index 1e26f4571e..845a29b9b7 100644 --- a/scripts/meson-buildoptions.sh +++ b/scripts/meson-buildoptions.sh @@ -40,6 +40,7 @@ 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' @@ -146,6 +147,8 @@ _meson_option_parse() { --disable-avx2) printf "%s" -Davx2=disabled ;; --enable-avx512f) printf "%s" -Davx512f=enabled ;; --disable-avx512f) printf "%s" -Davx512f=disabled ;; + --enable-blkio) printf "%s" -Dblkio=enabled ;; + --disable-blkio) printf "%s" -Dblkio=disabled ;; --enable-block-drv-whitelist-in-tools) printf "%s" -Dblock_drv_whitelist_in_tools=true ;; --disable-block-drv-whitelist-in-tools) printf "%s" -Dblock_drv_whitelist_in_tools=false ;; --enable-bochs) printf "%s" -Dbochs=enabled ;; From patchwork Tue Apr 5 15:33:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613498 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=f9ZKGlf8; dkim-atps=neutral Authentication-Results: ozlabs.org; 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Tue, 5 Apr 2022 15:33:29 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id A224740CF8E5; Tue, 5 Apr 2022 15:33:28 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 2/8] numa: call ->ram_block_removed() in ram_block_notifer_remove() Date: Tue, 5 Apr 2022 16:33:17 +0100 Message-Id: <20220405153323.2082242-3-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , David Hildenbrand , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" When a RAMBlockNotifier is added, ->ram_block_added() is called with all existing RAMBlocks. There is no equivalent ->ram_block_removed() call when a RAMBlockNotifier is removed. The util/vfio-helpers.c code (the sole user of RAMBlockNotifier) is fine with this asymmetry because it does not rely on RAMBlockNotifier for cleanup. It walks its internal list of DMA mappings and unmaps them by itself. Future users of RAMBlockNotifier may not have an internal data structure that records added RAMBlocks so they will need ->ram_block_removed() callbacks. This patch makes ram_block_notifier_remove() symmetric with respect to callbacks. Now util/vfio-helpers.c needs to unmap remaining DMA mappings after ram_block_notifier_remove() has been called. This is necessary since users like block/nvme.c may create additional DMA mappings that do not originate from the RAMBlockNotifier. Reviewed-by: David Hildenbrand Signed-off-by: Stefan Hajnoczi --- hw/core/numa.c | 17 +++++++++++++++++ util/vfio-helpers.c | 5 ++++- 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/hw/core/numa.c b/hw/core/numa.c index 1aa05dcf42..6bf9694d20 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); @@ -835,6 +848,10 @@ 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) diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index b037d5faa5..dc90496592 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); From patchwork Tue Apr 5 15:33:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613493 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; 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Tue, 05 Apr 2022 11:33:31 -0400 X-MC-Unique: fy1ZiO-6NkKymuXDbk_OSQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 92C42802803; Tue, 5 Apr 2022 15:33:30 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4B58B40CF8F7; Tue, 5 Apr 2022 15:33:30 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 3/8] block: pass size to bdrv_unregister_buf() Date: Tue, 5 Apr 2022 16:33:18 +0100 Message-Id: <20220405153323.2082242-4-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The only implementor of bdrv_register_buf() is block/nvme.c, where the size is not needed when unregistering a buffer. This is because util/vfio-helpers.c can look up mappings by address. Future block drivers that implement bdrv_register_buf() may not be able to do their job given only the buffer address. Add a size argument to bdrv_unregister_buf(). Also document the assumptions about bdrv_register_buf()/bdrv_unregister_buf() calls. The same values that were given to bdrv_register_buf() must be given to bdrv_unregister_buf(). gcc 11.2.1 emits a spurious warning that img_bench()'s buf_size local variable might be uninitialized, so it's necessary to silence the compiler. Signed-off-by: Stefan Hajnoczi --- include/block/block-global-state.h | 5 ++++- include/block/block_int-common.h | 2 +- include/sysemu/block-backend-global-state.h | 2 +- block/block-backend.c | 4 ++-- block/io.c | 6 +++--- block/nvme.c | 2 +- qemu-img.c | 4 ++-- 7 files changed, 14 insertions(+), 11 deletions(-) diff --git a/include/block/block-global-state.h b/include/block/block-global-state.h index 25bb69bbef..2295a7c767 100644 --- a/include/block/block-global-state.h +++ b/include/block/block-global-state.h @@ -244,9 +244,12 @@ 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 values that they were registered with. */ void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size); -void bdrv_unregister_buf(BlockDriverState *bs, void *host); +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..b7a7cbd3a5 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -435,7 +435,7 @@ struct BlockDriver { * DMA mapping for hot buffers. */ void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size); - void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host); + void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host, size_t size); /* * This field is modified only under the BQL, and is part of diff --git a/include/sysemu/block-backend-global-state.h b/include/sysemu/block-backend-global-state.h index 2e93a74679..989ec0364b 100644 --- a/include/sysemu/block-backend-global-state.h +++ b/include/sysemu/block-backend-global-state.h @@ -107,7 +107,7 @@ 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); +void blk_unregister_buf(BlockBackend *blk, void *host, size_t size); const BdrvChild *blk_root(BlockBackend *blk); diff --git a/block/block-backend.c b/block/block-backend.c index e0e1aff4b1..8af00d8a36 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -2591,10 +2591,10 @@ void blk_register_buf(BlockBackend *blk, void *host, size_t size) bdrv_register_buf(blk_bs(blk), host, size); } -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/io.c b/block/io.c index 3280144a17..a8a7920e29 100644 --- a/block/io.c +++ b/block/io.c @@ -3365,16 +3365,16 @@ void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size) } } -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/nvme.c b/block/nvme.c index 552029931d..88485e77f1 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -1592,7 +1592,7 @@ static void nvme_register_buf(BlockDriverState *bs, void *host, size_t size) } } -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/qemu-img.c b/qemu-img.c index 1caddfb23a..493fad758a 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -4363,7 +4363,7 @@ 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[] = { @@ -4585,7 +4585,7 @@ 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); From patchwork Tue Apr 5 15:33:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613494 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=CCFct1Up; 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Tue, 5 Apr 2022 15:33:32 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id AA342C28109; Tue, 5 Apr 2022 15:33:31 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 4/8] block: add BDRV_REQ_REGISTERED_BUF request flag Date: Tue, 5 Apr 2022 16:33:19 +0100 Message-Id: <20220405153323.2082242-5-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.8 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Block drivers may optimize I/O requests accessing buffers previously registered with bdrv_register_buf(). Checking whether all elements of a request's QEMUIOVector are within previously registered buffers is expensive, so we need a hint from the user to avoid costly checks. Add a BDRV_REQ_REGISTERED_BUF request flag to indicate that all QEMUIOVector elements in an I/O request are known to be within previously registered buffers. bdrv_aligned_preadv() is strict in validating supported read flags and its assertions fail when it sees BDRV_REQ_REGISTERED_BUF. There is no harm in passing BDRV_REQ_REGISTERED_BUF to block drivers that do not support it, so update the assertions to ignore BDRV_REQ_REGISTERED_BUF. Care must be taken to clear the flag when the block layer or filter drivers replace QEMUIOVector elements with bounce buffers since these have not been registered with bdrv_register_buf(). A lot of the changes in this commit deal with clearing the flag in those cases. Ensuring that the flag is cleared properly is somewhat invasive to implement across the block layer and it's hard to spot when future code changes accidentally break it. Another option might be to add a flag to QEMUIOVector itself and clear it in qemu_iovec_*() functions that modify elements. That is more robust but somewhat of a layering violation, so I haven't attempted that. Signed-off-by: Stefan Hajnoczi --- include/block/block-common.h | 9 +++++++++ block/blkverify.c | 4 ++-- block/crypto.c | 2 ++ block/io.c | 30 +++++++++++++++++++++++------- block/mirror.c | 2 ++ block/raw-format.c | 2 ++ 6 files changed, 40 insertions(+), 9 deletions(-) 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/block/blkverify.c b/block/blkverify.c index e4a37af3b2..d624f4fd05 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/crypto.c b/block/crypto.c index 1ba82984ef..c900355adb 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -473,6 +473,8 @@ 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); + flags &= ~BDRV_REQ_REGISTERED_BUF; + assert(!(flags & ~BDRV_REQ_FUA)); assert(payload_offset < INT64_MAX); assert(QEMU_IS_ALIGNED(offset, sector_size)); diff --git a/block/io.c b/block/io.c index a8a7920e29..139e36c2e1 100644 --- a/block/io.c +++ b/block/io.c @@ -1556,11 +1556,14 @@ 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) { @@ -1601,7 +1604,7 @@ 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) { @@ -1790,7 +1793,8 @@ 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; @@ -1818,6 +1822,10 @@ 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; } @@ -1872,7 +1880,7 @@ 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; } @@ -1917,6 +1925,11 @@ 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); @@ -2202,6 +2215,9 @@ 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)); @@ -2319,7 +2335,7 @@ 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; } diff --git a/block/mirror.c b/block/mirror.c index d8ecb9efa2..3a0773622d 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -1477,6 +1477,8 @@ 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/raw-format.c b/block/raw-format.c index 69fd650eaf..9bae3dd7f2 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); From patchwork Tue Apr 5 15:33:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613496 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=ir98SHj2; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4KXsFj0qkhz9s07 for ; Wed, 6 Apr 2022 01:36:57 +1000 (AEST) Received: from localhost ([::1]:51026 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nblEl-0006E4-62 for incoming@patchwork.ozlabs.org; Tue, 05 Apr 2022 11:36:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53336) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nblBc-0008SC-Cl for qemu-devel@nongnu.org; Tue, 05 Apr 2022 11:33:40 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:40653) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nblBa-0003xq-LH for qemu-devel@nongnu.org; Tue, 05 Apr 2022 11:33:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649172818; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=z27wY7LMsyYml0Zn7/cl2HTSjbqjzvvTnlR4z7kQSOc=; b=ir98SHj21EkNP2KwBET6hsJVNUxXjUj0jXrKXqvplEp3LfbW+4CvcrFME8dSNZ3TIVC7YX dPY/p2fh4yvM8/8NwZCMUihV4KMUNK+ivEDYDeuQwHAhy2zgnTn0tSGMehwKWgiPQOjaV8 H7FM1lWuo5tGCLezqLcYcRdsGL2BqsI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-107-9xRVLpbTM0uDvYd6nW4wwg-1; Tue, 05 Apr 2022 11:33:34 -0400 X-MC-Unique: 9xRVLpbTM0uDvYd6nW4wwg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A3B5C3C11A07; Tue, 5 Apr 2022 15:33:33 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3D7EB1415131; Tue, 5 Apr 2022 15:33:32 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 5/8] block: add BlockRAMRegistrar Date: Tue, 5 Apr 2022 16:33:20 +0100 Message-Id: <20220405153323.2082242-6-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Emulated devices and other BlockBackend users wishing to take advantage of blk_register_buf() all have the same repetitive job: register RAMBlocks with the BlockBackend using RAMBlockNotifier. Add a BlockRAMRegistrar API to do this. A later commit will use this from hw/block/virtio-blk.c. Signed-off-by: Stefan Hajnoczi --- MAINTAINERS | 1 + include/sysemu/block-ram-registrar.h | 30 +++++++++++++++++++++ block/block-ram-registrar.c | 39 ++++++++++++++++++++++++++++ block/meson.build | 1 + 4 files changed, 71 insertions(+) create mode 100644 include/sysemu/block-ram-registrar.h create mode 100644 block/block-ram-registrar.c diff --git a/MAINTAINERS b/MAINTAINERS index d839301f68..655f79c9f7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2462,6 +2462,7 @@ 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* diff --git a/include/sysemu/block-ram-registrar.h b/include/sysemu/block-ram-registrar.h new file mode 100644 index 0000000000..09d63f64b2 --- /dev/null +++ b/include/sysemu/block-ram-registrar.h @@ -0,0 +1,30 @@ +/* + * 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 + * BLK_REQ_REGISTERED_BUF flag set. + */ +typedef struct { + BlockBackend *blk; + RAMBlockNotifier notifier; +} BlockRAMRegistrar; + +void blk_ram_registrar_init(BlockRAMRegistrar *r, BlockBackend *blk); +void blk_ram_registrar_destroy(BlockRAMRegistrar *r); + +#endif /* BLOCK_RAM_REGISTRAR_H */ diff --git a/block/block-ram-registrar.c b/block/block-ram-registrar.c new file mode 100644 index 0000000000..32a14b69ae --- /dev/null +++ b/block/block-ram-registrar.c @@ -0,0 +1,39 @@ +/* + * 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" + +static void ram_block_added(RAMBlockNotifier *n, void *host, size_t size, + size_t max_size) +{ + BlockRAMRegistrar *r = container_of(n, BlockRAMRegistrar, notifier); + blk_register_buf(r->blk, host, max_size); +} + +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_notifier_add(&r->notifier); +} + +void blk_ram_registrar_destroy(BlockRAMRegistrar *r) +{ + ram_block_notifier_remove(&r->notifier); +} diff --git a/block/meson.build b/block/meson.build index 787667384a..b315593054 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')) From patchwork Tue Apr 5 15:33:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613495 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; 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Tue, 05 Apr 2022 11:33:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:27138) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nblBc-0003yG-4z for qemu-devel@nongnu.org; Tue, 05 Apr 2022 11:33:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649172819; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5Uq7DE7cZO1deQaJbvM3lIszCBeQOVFN9M1aTfL+W9A=; b=Pg3SAQB1DAkXbHlkE0g61Up4UJ2jcGVuDbP3yitX/K63Crw6s3GSZqpcqcBP+AUkLXJcOG G0yxAQ59wLSrL7bNtP5zT5ShdW4euB1rQ64fC0xwpNJU9+Q3YuqPHmGtmUgR0bNnKo40Db NPYhooOxiE50+4Pak7DLLAuKD8lQuFI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-586-pMY1iZ7DNeSNFSfRf9hC6A-1; Tue, 05 Apr 2022 11:33:35 -0400 X-MC-Unique: pMY1iZ7DNeSNFSfRf9hC6A-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 168223C11A16; Tue, 5 Apr 2022 15:33:35 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id BE6521415131; Tue, 5 Apr 2022 15:33:34 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 6/8] stubs: add memory_region_from_host() and memory_region_get_fd() Date: Tue, 5 Apr 2022 16:33:21 +0100 Message-Id: <20220405153323.2082242-7-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The blkio block driver will need to look up the file descriptor for a given pointer. This is possible in softmmu builds where the memory API is available for querying guest RAM. Add stubs so tools like qemu-img that link the block layer still build successfully. In this case there is no guest RAM but that is fine. Bounce buffers and their file descriptors will be allocated with libblkio's blkio_alloc_mem_region() so we won't rely on QEMU's memory_region_get_fd() in that case. Signed-off-by: Stefan Hajnoczi --- stubs/memory.c | 13 +++++++++++++ stubs/meson.build | 1 + 2 files changed, 14 insertions(+) create mode 100644 stubs/memory.c diff --git a/stubs/memory.c b/stubs/memory.c new file mode 100644 index 0000000000..e9ec4e384b --- /dev/null +++ b/stubs/memory.c @@ -0,0 +1,13 @@ +#include "qemu/osdep.h" +#include "exec/memory.h" + +MemoryRegion *memory_region_from_host(void *host, ram_addr_t *offset) +{ + return NULL; +} + +int memory_region_get_fd(MemoryRegion *mr) +{ + return -1; +} + diff --git a/stubs/meson.build b/stubs/meson.build index 6f80fec761..1e274d2db2 100644 --- a/stubs/meson.build +++ b/stubs/meson.build @@ -25,6 +25,7 @@ stub_ss.add(files('is-daemonized.c')) if libaio.found() stub_ss.add(files('linux-aio.c')) endif +stub_ss.add(files('memory.c')) stub_ss.add(files('migr-blocker.c')) stub_ss.add(files('module-opts.c')) stub_ss.add(files('monitor.c')) From patchwork Tue Apr 5 15:33:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613500 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; 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Tue, 05 Apr 2022 11:33:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:55995) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nblBb-0003y7-L9 for qemu-devel@nongnu.org; Tue, 05 Apr 2022 11:33:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649172818; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WRqN1I7sTZOncrMVu4zncMtOn1KViOj5cuO23NWJrTU=; b=WaXTOG8V3MAXphgxPj+KXjfkNF3X6cKc1bY0f55UZnSPkGg/u76kcWYEi5MIvxurQ3tAq3 R1qzSybcBoStNIBuqiQbFuGSbhSkSEPtMUtm+k75Xr6tiGEhezP1p4hr2kYMNdfI6VFis3 /CjUfmwcZFU5fb78bgq67XzDHVhdYtE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-526-0UZjXfmSP_C6hBvnld95Xg-1; Tue, 05 Apr 2022 11:33:37 -0400 X-MC-Unique: 0UZjXfmSP_C6hBvnld95Xg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 95AAD185A7B2; Tue, 5 Apr 2022 15:33:36 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4A4DFC28111; Tue, 5 Apr 2022 15:33:36 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 7/8] blkio: implement BDRV_REQ_REGISTERED_BUF optimization Date: Tue, 5 Apr 2022 16:33:22 +0100 Message-Id: <20220405153323.2082242-8-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.8 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Avoid bounce buffers when QEMUIOVector elements are within previously registered bdrv_register_buf() buffers. The idea is that emulated storage controllers will register guest RAM using bdrv_register_buf() and set the BDRV_REQ_REGISTERED_BUF on I/O requests. Therefore no blkio_add_mem_region() calls are necessary in the performance-critical I/O code path. This optimization doesn't apply if the I/O buffer is internally allocated by QEMU (e.g. qcow2 metadata). There we still take the slow path because BDRV_REQ_REGISTERED_BUF is not set. Signed-off-by: Stefan Hajnoczi --- block/blkio.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 101 insertions(+), 5 deletions(-) diff --git a/block/blkio.c b/block/blkio.c index 562e972003..41894c7015 100644 --- a/block/blkio.c +++ b/block/blkio.c @@ -1,7 +1,9 @@ #include "qemu/osdep.h" #include #include "block/block_int.h" +#include "exec/memory.h" #include "qapi/error.h" +#include "qemu/error-report.h" #include "qapi/qmp/qdict.h" #include "qemu/module.h" @@ -25,6 +27,9 @@ typedef struct { /* 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; } BDRVBlkioState; static void blkio_aiocb_complete(BlkioAIOCB *acb, int ret) @@ -157,6 +162,8 @@ static BlockAIOCB *blkio_aio_preadv(BlockDriverState *bs, int64_t offset, BlockCompletionFunc *cb, void *opaque) { BDRVBlkioState *s = bs->opaque; + bool needs_mem_regions = + s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); struct iovec *iov = qiov->iov; int iovcnt = qiov->niov; BlkioAIOCB *acb; @@ -166,7 +173,7 @@ static BlockAIOCB *blkio_aio_preadv(BlockDriverState *bs, int64_t offset, acb = blkio_aiocb_get(bs, cb, opaque); - if (s->needs_mem_regions) { + if (needs_mem_regions) { if (blkio_aiocb_init_mem_region_locked(acb, bytes) < 0) { qemu_aio_unref(&acb->common); return NULL; @@ -181,7 +188,7 @@ static BlockAIOCB *blkio_aio_preadv(BlockDriverState *bs, int64_t offset, ret = blkioq_readv(s->blkioq, offset, iov, iovcnt, acb, 0); if (ret < 0) { - if (s->needs_mem_regions) { + if (needs_mem_regions) { blkio_free_mem_region(s->blkio, &acb->mem_region); qemu_iovec_destroy(&acb->qiov); } @@ -202,6 +209,8 @@ static BlockAIOCB *blkio_aio_pwritev(BlockDriverState *bs, int64_t offset, { uint32_t blkio_flags = (flags & BDRV_REQ_FUA) ? BLKIO_REQ_FUA : 0; BDRVBlkioState *s = bs->opaque; + bool needs_mem_regions = + s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); struct iovec *iov = qiov->iov; int iovcnt = qiov->niov; BlkioAIOCB *acb; @@ -211,7 +220,7 @@ static BlockAIOCB *blkio_aio_pwritev(BlockDriverState *bs, int64_t offset, acb = blkio_aiocb_get(bs, cb, opaque); - if (s->needs_mem_regions) { + if (needs_mem_regions) { if (blkio_aiocb_init_mem_region_locked(acb, bytes) < 0) { qemu_aio_unref(&acb->common); return NULL; @@ -225,7 +234,7 @@ static BlockAIOCB *blkio_aio_pwritev(BlockDriverState *bs, int64_t offset, ret = blkioq_writev(s->blkioq, offset, iov, iovcnt, acb, blkio_flags); if (ret < 0) { - if (s->needs_mem_regions) { + if (needs_mem_regions) { blkio_free_mem_region(s->blkio, &acb->mem_region); } qemu_aio_unref(&acb->common); @@ -273,6 +282,80 @@ static void blkio_io_unplug(BlockDriverState *bs) } } +static void blkio_register_buf(BlockDriverState *bs, void *host, size_t size) +{ + BDRVBlkioState *s = bs->opaque; + int ret; + struct blkio_mem_region region = (struct blkio_mem_region){ + .addr = host, + .len = size, + .fd = -1, + }; + + if (((uintptr_t)host | size) % s->mem_region_alignment) { + error_report_once("%s: skipping unaligned buf %p with size %zu", + __func__, host, size); + return; /* skip unaligned */ + } + + /* Attempt to find the fd for a MemoryRegion */ + if (s->needs_mem_region_fd) { + int fd = -1; + ram_addr_t offset; + MemoryRegion *mr; + + /* + * bdrv_register_buf() is called with the BQL held so mr lives at least + * until this function returns. + */ + mr = memory_region_from_host(host, &offset); + if (mr) { + fd = memory_region_get_fd(mr); + } + if (fd == -1) { + error_report_once("%s: skipping fd-less buf %p with size %zu", + __func__, host, size); + return; /* skip if there is no fd */ + } + + region.fd = fd; + region.fd_offset = offset; + } + + WITH_QEMU_LOCK_GUARD(&s->lock) { + ret = blkio_add_mem_region(s->blkio, ®ion); + } + + if (ret < 0) { + error_report_once("Failed to add blkio mem region %p with size %zu: %s", + host, size, blkio_get_error_msg()); + } +} + +static void blkio_unregister_buf(BlockDriverState *bs, void *host, size_t size) +{ + BDRVBlkioState *s = bs->opaque; + int ret; + struct blkio_mem_region region = (struct blkio_mem_region){ + .addr = host, + .len = size, + .fd = -1, + }; + + if (((uintptr_t)host | size) % s->mem_region_alignment) { + return; /* skip unaligned */ + } + + WITH_QEMU_LOCK_GUARD(&s->lock) { + ret = blkio_del_mem_region(s->blkio, ®ion); + } + + if (ret < 0) { + error_report_once("Failed to delete blkio mem region %p with size %zu: %s", + host, size, blkio_get_error_msg()); + } +} + static void blkio_parse_filename_io_uring(const char *filename, QDict *options, Error **errp) { @@ -341,6 +424,17 @@ static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, 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); @@ -360,7 +454,7 @@ static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, return ret; } - bs->supported_write_flags = BDRV_REQ_FUA; + bs->supported_write_flags = BDRV_REQ_FUA | BDRV_REQ_REGISTERED_BUF; qemu_mutex_init(&s->lock); s->blkioq = blkio_get_queue(s->blkio, 0); @@ -514,6 +608,8 @@ static BlockDriver bdrv_io_uring = { .bdrv_aio_flush = blkio_aio_flush, .bdrv_io_unplug = blkio_io_unplug, .bdrv_refresh_limits = blkio_refresh_limits, + .bdrv_register_buf = blkio_register_buf, + .bdrv_unregister_buf = blkio_unregister_buf, /* * TODO From patchwork Tue Apr 5 15:33:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1613497 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; 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Tue, 05 Apr 2022 11:33:39 -0400 X-MC-Unique: i88cVBcJOEe-lxmtEBEJAw-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6D17F1C068DA; Tue, 5 Apr 2022 15:33:38 +0000 (UTC) Received: from localhost (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id 24193401E6C; Tue, 5 Apr 2022 15:33:37 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [RFC v2 8/8] virtio-blk: use BDRV_REQ_REGISTERED_BUF optimization hint Date: Tue, 5 Apr 2022 16:33:23 +0100 Message-Id: <20220405153323.2082242-9-stefanha@redhat.com> In-Reply-To: <20220405153323.2082242-1-stefanha@redhat.com> References: <20220405153323.2082242-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Thomas Huth , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, "Michael S. Tsirkin" , Laurent Vivier , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Faria , Markus Armbruster , Yanan Wang , Eduardo Habkost , Hanna Reitz , Stefan Hajnoczi , Paolo Bonzini , John Snow , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Register guest RAM using BlockRAMRegistrar and set the BDRV_REQ_REGISTERED_BUF flag so block drivers can optimize memory accesses in I/O requests. This is for vdpa-blk, vhost-user-blk, and other I/O interfaces that rely on DMA mapping/unmapping. Signed-off-by: Stefan Hajnoczi --- include/hw/virtio/virtio-blk.h | 2 ++ hw/block/virtio-blk.c | 13 +++++++++---- 2 files changed, 11 insertions(+), 4 deletions(-) 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/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 540c38f829..a18cf05f14 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" @@ -421,11 +422,13 @@ static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb, } 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, + BDRV_REQ_REGISTERED_BUF, 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, + BDRV_REQ_REGISTERED_BUF, virtio_blk_rw_complete, + mrb->reqs[start]); } } @@ -1228,6 +1231,7 @@ 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_set_guest_block_size(s->blk, s->conf.conf.logical_block_size); @@ -1255,6 +1259,7 @@ static void virtio_blk_device_unrealize(DeviceState *dev) } qemu_coroutine_decrease_pool_batch_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);