From nobody Mon Feb 9 19:06:28 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=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1748845444; cv=none; d=zohomail.com; s=zohoarc; b=awo0uK2YK3IbPBjdkenaisVPdOsF/gWQ4xn4Uu94aXB3xT5fRQ9ckdPF83dBFTk1Qz3l0MfI16UWhYtOjkJxBbelA/jtp2Q2wcLXiWOfEuf6zY0vWHMW8yuTYJ/ItdFZXjYmmZY0ULaHqHRZtefbQnuaG4bUTNlyy9+rtoD+DD4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1748845444; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=TL3Io6uv1wYqEJLOSkdLO7yEUmLjlnt6GTg1df0N+1g=; b=NiEII31UQUg2vIu3Sy3Imt+HDdWyzFwAGjNmHsBHh+9EztApqH9ewWjsqouVIGKVfTRMC78+b30AA6DGr61QwYQN4nmPljFzG0gN2H/kco5vFuvfXzSer5+ktjzEUFde4f9tNmbPyrEtxSALkeb4U13tz/1UNYPnkRFkt5SDC4g= 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 1748845444257892.3141724375649; Sun, 1 Jun 2025 23:24:04 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uLyZl-000713-4P; Mon, 02 Jun 2025 02:23:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uLyLP-0006dC-Th for qemu-devel@nongnu.org; Mon, 02 Jun 2025 02:08:41 -0400 Received: from mail-pf1-x431.google.com ([2607:f8b0:4864:20::431]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1uLyLN-00026L-MP for qemu-devel@nongnu.org; Mon, 02 Jun 2025 02:08:23 -0400 Received: by mail-pf1-x431.google.com with SMTP id d2e1a72fcca58-73972a54919so3348759b3a.3 for ; Sun, 01 Jun 2025 23:08:21 -0700 (PDT) Received: from shemhazi.lan ([50.46.174.34]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-747afff7388sm7036966b3a.171.2025.06.01.23.08.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Jun 2025 23:08:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1748844500; x=1749449300; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=TL3Io6uv1wYqEJLOSkdLO7yEUmLjlnt6GTg1df0N+1g=; b=W7IVue+nkS4m2CTbfOnInLZnZIu4lOaMkz6y66TaRUuyxNMTjV2lOU6yB7pN9bx8+7 JT3Ftga3qvMaOE/LfvXxYEfGR5xjBz6Zlh2LwIH4No0+hdX/pet2qkB2/lZmZrd0akbz 1c4VCZstghzB/dI9+Bjhd3S4E2Xma3YWnG6CtJQS77NWgH+PIuutSAVNLQBZ7Vr/lbMw Qp+HwTzBSMyuc5CVg9EITLU9AhEfGD6hpuFOGB86eSF/8ZzrQDIE1PAJNKC0xIrbGfgi Xcn5X1Iu2JclJG4/LZaiMueiVcIWLpEGH18BAbzR2VU9oyh0jyEu7WVwM2xbx+XInRQA +bsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748844500; x=1749449300; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=TL3Io6uv1wYqEJLOSkdLO7yEUmLjlnt6GTg1df0N+1g=; b=J3qga7upS1aofsw+RaYBN7ofqm2CEhNMenUX+6MQcw1FODz3sKR4nVdtAINQkYYoqg qRnh+edRhLhRcA2a1/+wWD7TyscbxyAwYTp/aS8BxiY9zIR0OprbfP4c9DqE2iaxcre7 bufsEImAMAq5XVOk/3jIF0wqAOfYW+sy4P7inO/NNBT5Gi9Qsk9qTHDL7Yw+LF+6weMJ OHB1LU7LTyIaYu/G4j3Kw1p0oIzKIJepbnSL5NqpIj6uXK7vlKFPYSRt8uv9JgxYzjwx 5WVpIKai0bGcdXc4W2z7BeopznCGxwFPGH3uoXtaGHHPjNqAtn5KQ0cG5+6s52mAdoav 8ZPg== X-Gm-Message-State: AOJu0YxIpqrbkG3Y9Nmj6qNyiRJY97/sT/kNJqJTcKCvmXwsznHpK1Gi mUwLLa0uzXhfS+D5NAlmf8sUwyQwMImw7PKSVvSAaNKSl1xQ1J7MJ8cppTyb7K4Xa8E= X-Gm-Gg: ASbGncuqQjwrWdtUE6dF+5+9co1Va24JZZE/JXhCa9JMSipabs7qj0fjwuf84uzFXl4 +Gxl7VUE9JYEoJZ1HjBV3LINxjZ0sow6AF6yN7sRVa/5bdAekuS8QbRHN8bnrKKfaIu0W2//AtM r+h6gFoq7pJTWEZF4P4QBx5HIpx1BcljWEat+W6kOGfkCO9vOosjZXgbtMASWmD65NHU/DGdUDB 9hGAP7jc9OYgWexrNg5DsPqObwQvEPRbguv9iG8OhKRLu29zha4yyx+AhK1ukQVxpYenYkQ3FiC F42JMiXOB2jFTpWKJvYUi1oMcnsAPYsfw2cm0XioJWAxRz9tuFY= X-Google-Smtp-Source: AGHT+IFE5UK4DUDTTTNkkAtttysd+3ZvdSYQ3kG5wBDX85/dpOnqOcALcKGFOwRbmDnpdSfzbPnHFQ== X-Received: by 2002:a05:6a20:9186:b0:215:eafc:abd9 with SMTP id adf61e73a8af0-21ba1165cfbmr11260756637.14.1748844500080; Sun, 01 Jun 2025 23:08:20 -0700 (PDT) From: Rowan Hart To: qemu-devel@nongnu.org Cc: Yanan Wang , Richard Henderson , Alexandre Iooss , Zhao Liu , Eduardo Habkost , Mahmoud Mandour , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Pierrick Bouvier , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Paolo Bonzini , Marcel Apfelbaum , novafacing Subject: [PATCH v6 4/9] plugins: Add memory virtual address write API Date: Sun, 1 Jun 2025 23:08:10 -0700 Message-ID: <20250602060815.328261-5-rowanbhart@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250602060815.328261-1-rowanbhart@gmail.com> References: <20250602060815.328261-1-rowanbhart@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=2607:f8b0:4864:20::431; envelope-from=rowanbhart@gmail.com; helo=mail-pf1-x431.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1748845446378116600 Content-Type: text/plain; charset="utf-8" From: novafacing This patch adds functions to the plugins API to allow reading and writing memory via virtual addresses. These functions only permit doing so on the current CPU, because there is no way to ensure consistency if plugins are allowed to read or write to other CPUs that aren't currently in the context of the plugin. Signed-off-by: novafacing Signed-off-by: Rowan Hart --- include/qemu/qemu-plugin.h | 21 +++++++++++++++++++++ plugins/api.c | 18 ++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index 120fb626a6..8ae7758b95 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -948,6 +948,27 @@ QEMU_PLUGIN_API bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByteArray *data, size_t len); =20 +/** + * qemu_plugin_write_memory_vaddr() - write to memory using a virtual addr= ess + * + * @addr: A virtual address to write to + * @data: A byte array containing the data to write + * + * The contents of @data will be written to memory starting at the virtual + * address @addr. + * + * This function does not guarantee consistency of writes, nor does it ens= ure + * that pending writes are flushed either before or after the write takes = place, + * so callers should take care to only call this function in vCPU context = (i.e. + * in callbacks) and avoid depending on the existence of data written usin= g this + * function which may be overwritten afterward. + * + * Returns true on success and false on failure. + */ +QEMU_PLUGIN_API +bool qemu_plugin_write_memory_vaddr(uint64_t addr, + GByteArray *data); + /** * qemu_plugin_scoreboard_new() - alloc a new scoreboard * diff --git a/plugins/api.c b/plugins/api.c index 16141f5c25..7258b6590b 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -476,6 +476,24 @@ bool qemu_plugin_read_memory_vaddr(uint64_t addr, GByt= eArray *data, size_t len) return true; } =20 +bool qemu_plugin_write_memory_vaddr(uint64_t addr, GByteArray *data) +{ + g_assert(current_cpu); + + if (data->len =3D=3D 0) { + return false; + } + + int result =3D cpu_memory_rw_debug(current_cpu, addr, data->data, + data->len, true); + + if (result < 0) { + return false; + } + + return true; +} + struct qemu_plugin_scoreboard *qemu_plugin_scoreboard_new(size_t element_s= ize) { return plugin_scoreboard_new(element_size); --=20 2.49.0