From nobody Tue Feb 10 04:15:20 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1665092845; cv=none; d=zohomail.com; s=zohoarc; b=CwyMozR5tRulIAKgUe+9Y/M5P6sKFgJ9I3ubDoYG3QFoRsqVAIAG2QqmzsLMGpsG/R3viorbboJHF14NzUI5rrgfYHDrs1b9dFgD7+JQgAk74IIolsgmfXwlDa8RQXiKzji01At8c/6g1WAFX29K5+gYS0gv8gYnH5EdT0dEd24= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1665092845; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=L9dc4RCOlCVz8fWR0fMBCkDrdz+LUU9NRcMBPJbuPTg=; b=RhsXvmG8miNeSEhaEfFUZ6Lah/3KE2TZu6QHLOws+GT2/52B5stutLwh8BTjxdXP6yTo21lkHUN1zGJYul3D5KkvdjGJNRiaYsrPNU2PooqCKdjq34zvGF59UjlvGi8FniOx9ufqyr9eCzrJOikVML7IWBNMBPOm9FDrqTmZO7Y= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 166509284589135.07896448780593; Thu, 6 Oct 2022 14:47:25 -0700 (PDT) Received: from localhost ([::1]:42920 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ogYiC-0003W3-SI for importer@patchew.org; Thu, 06 Oct 2022 17:47:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40002) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogYWx-0003Im-5T for qemu-devel@nongnu.org; Thu, 06 Oct 2022 17:35:49 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:49295) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogYWs-0006tZ-S1 for qemu-devel@nongnu.org; Thu, 06 Oct 2022 17:35:46 -0400 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-481-Y7_E2QfLMwGW3jw6DGzOVA-1; Thu, 06 Oct 2022 17:35:35 -0400 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 253183C01DE6; Thu, 6 Oct 2022 21:35:34 +0000 (UTC) Received: from localhost (unknown [10.39.193.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id 758E453593B; Thu, 6 Oct 2022 21:35:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1665092142; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=L9dc4RCOlCVz8fWR0fMBCkDrdz+LUU9NRcMBPJbuPTg=; b=h+9OJ5de7+ru4ooaHUAO03jxojU5LVM73rHPOak7DUJ5MSBYJCqYAIVHzUfy1IBeLr46WU ApbE90b0ys6uXZdUMgZK+hjznLjJhGpC5wfgKKdxYxqkPafp4R5pWU5tGeQwPo8O7b/wPO 8iJctGJYe2rwDo15e1+AOLy3EENbv3Q= X-MC-Unique: Y7_E2QfLMwGW3jw6DGzOVA-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Yanan Wang , sgarzare@redhat.com, "Richard W.M. Jones" , Fam Zheng , Hanna Reitz , David Hildenbrand , integration@gluster.org, qemu-block@nongnu.org, Vladimir Sementsov-Ogievskiy , Paolo Bonzini , Kevin Wolf , afaria@redhat.com, Richard Henderson , Eric Blake , "Michael S. Tsirkin" , Thomas Huth , Xie Changlong , John Snow , Eduardo Habkost , Jeff Cody , Stefan Hajnoczi , "Denis V. Lunev" , Markus Armbruster , Laurent Vivier , Peter Xu , Raphael Norwitz , Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Wen Congyang Subject: [PATCH v6 09/13] block: add BlockRAMRegistrar Date: Thu, 6 Oct 2022 17:35:03 -0400 Message-Id: <20221006213507.645402-10-stefanha@redhat.com> In-Reply-To: <20221006213507.645402-1-stefanha@redhat.com> References: <20221006213507.645402-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1665092846215100001 Content-Type: text/plain; charset="utf-8" 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 | 37 ++++++++++++++++++ block/block-ram-registrar.c | 58 ++++++++++++++++++++++++++++ block/meson.build | 1 + 4 files changed, 97 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 0dcae6168a..91aed2cdc7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2498,6 +2498,7 @@ 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-ra= m-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 BlockRAMRegis= trar + * 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/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 =3D container_of(n, BlockRAMRegistrar, notifier); + Error *err =3D 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 =3D false; + } +} + +static void ram_block_removed(RAMBlockNotifier *n, void *host, size_t size, + size_t max_size) +{ + BlockRAMRegistrar *r =3D container_of(n, BlockRAMRegistrar, notifier); + blk_unregister_buf(r->blk, host, max_size); +} + +void blk_ram_registrar_init(BlockRAMRegistrar *r, BlockBackend *blk) +{ + r->blk =3D blk; + r->notifier =3D (RAMBlockNotifier){ + .ram_block_added =3D ram_block_added, + .ram_block_removed =3D ram_block_removed, + + /* + * .ram_block_resized() is not necessary because we use the max_si= ze + * value that does not change across resize. + */ + }; + r->ok =3D 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/meson.build b/block/meson.build index 500878f082..b7c68b83a3 100644 --- a/block/meson.build +++ b/block/meson.build @@ -46,6 +46,7 @@ block_ss.add(files( ), zstd, zlib, gnutls) =20 softmmu_ss.add(when: 'CONFIG_TCG', if_true: files('blkreplay.c')) +softmmu_ss.add(files('block-ram-registrar.c')) =20 if get_option('qcow1').allowed() block_ss.add(files('qcow.c')) --=20 2.37.3