From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 78C99CCF9E0 for ; Mon, 27 Oct 2025 11:13:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vDL27-0001Eh-QA; Mon, 27 Oct 2025 07:05:03 -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 1vDL1o-0000pP-1p for qemu-arm@nongnu.org; Mon, 27 Oct 2025 07:04:49 -0400 Received: from mail-ed1-x535.google.com ([2a00:1450:4864:20::535]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1vDL1Q-0005d0-Ms for qemu-arm@nongnu.org; Mon, 27 Oct 2025 07:04:43 -0400 Received: by mail-ed1-x535.google.com with SMTP id 4fb4d7f45d1cf-63c0c9a408aso7200398a12.3 for ; Mon, 27 Oct 2025 04:03:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1761563031; x=1762167831; 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=80isSoz7EOdlCaIZfqdN1lA628I3DHM5sFKCGcUmW68=; b=TSPh37aPZW4vu1QXTfVnStpNZsT7hT7MQtrkc6ivXSfapjyFzfGftgQ/4ZfG3c4yom GH4V4QV+9XWeZ4r+fpg3WiJzLwGSHagvTsiEANHzfeL8pOohfpEjf7LU7GFCSbSugOUu N8S3j8OmJBdpGJv/Js5hJmZy8te6kSlB/kPeZ+xOn/eeHyAm1+TA8v5ZcaULxVP2GUwV DHDE3vB7WzfVHSfqVa69Vn53nAavojUoxogYL7x/dUgGKCX9VM+dLetStcL/0xjo7ieR edbU3Gjxj6K8f47XTczS1/WME7wg4ImMLmPvPk0tbM67adn2slhmHpJFiIqA6T1HanK/ nLXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761563031; x=1762167831; 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=80isSoz7EOdlCaIZfqdN1lA628I3DHM5sFKCGcUmW68=; b=p5WjXGzvBWHeOPv/NF7npVmKaixMpiXQhvyG2jgnkistacivZnM7aQ9GdFb/S003RG 7nZuflMqrSeeY0te8MUDYgVsenhew+2FkKrPPsgF8Pu9obSwlfPB52TxaSBzdomIfh1o ePcav/7DxEu8uCbUm8mkbhsQURTlC9+ku/e1ZQ4aowEZ3BBY5Zpldg5kEWVXb3Yp1uBh x2IKXIBwixySd6vMrSHQo8ngNDIro4MDBzuJc9QEtkghSq1XHM9sTFJMLAp72jFXut5Y cQsmUQ6scxk/S2KGKj1pb/JilJhq+ODt8KlAEQr01l3a1YQ8BwzXJ36Wl5sXACfjiVRr yrcg== X-Forwarded-Encrypted: i=1; AJvYcCWx3pPFgmY1EZbxlvziFZaOUZDVZ9UdUjiJHaDiCqjNpapjxF4PQVF/C5FJI/jmKekuX1lc/P8s8A==@nongnu.org X-Gm-Message-State: AOJu0YyP6DAQ0JZt2ToSc9umfCva3mazd4UUoe41W+j2HFjkpfgBrOin c0MjwYqkb9zBODfn+bcY1u4M7mzOXiN07sSe4/2I0fgmgk7RdkS2ojiey0IKephvEXc= X-Gm-Gg: ASbGnctcW2nrbVQ4ctw1hLZnQp4fhEe/8iROB5elHbwifoed6+o6guUb4P/HZxHJ0Vd oQj+H/zXbRXp3QMTPHUD8eeMNmC6TRcwq6SERKNinbivUzyWUw5UEqe96IB141CDDM4SUNFk8ZC AjC4KSSzKPgI7FmHGz3dn/mbNxcnbO+iyTorfbqZ75ppwjYXu4kYjLvrtNcjcxSyWtGkpKGH8/N OycaCG5wzQwRb9EhbLE7AeOWoDK6WEt4XoUicDIFnZI41Wp/NdonyJd7v2UYpzZk0UEvAqde9Ri 9pSF6xrqvhsrMpsjRB1IT+vlUPXWqv7HaDRQBDn60CQNc+AWt1BpxaLLt0mCOn2NdGcxdK80n2B z3toaHoLRYx7f2TYHQ1cgNCy85dOOozmLDAqcqmH6QWS1/vboUkSyYxLjY0xLkwjX2z9zIQVz+g Tv X-Google-Smtp-Source: AGHT+IEwkJfYwImH4/uCjYjquIxa9anv7Yli+nUcbmModwXg9PXqYo5p22WyVAQiluKBu9SNJZsjpA== X-Received: by 2002:a05:6402:5191:b0:63c:4f1e:6d82 with SMTP id 4fb4d7f45d1cf-63c4f1e73acmr31079387a12.24.1761563030929; Mon, 27 Oct 2025 04:03:50 -0700 (PDT) Received: from draig.lan ([185.126.160.19]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-63e7efb950csm6163477a12.28.2025.10.27.04.03.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Oct 2025 04:03:49 -0700 (PDT) Received: from draig.lan (localhost [IPv6:::1]) by draig.lan (Postfix) with ESMTP id BD2B55FAD0; Mon, 27 Oct 2025 11:03:44 +0000 (GMT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: Liu Zhiwei , Alexandre Iooss , Chinmay Rath , qemu-arm@nongnu.org, Peter Maydell , Nicholas Piggin , Ilya Leoshkevich , David Hildenbrand , qemu-ppc@nongnu.org, Paolo Bonzini , qemu-s390x@nongnu.org, Pierrick Bouvier , Bastian Koppelmann , Helge Deller , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Stafford Horne , Mahmoud Mandour , Artyom Tarasenko , Eduardo Habkost , Palmer Dabbelt , Alistair Francis , Laurent Vivier , Weiwei Li , Daniel Henrique Barboza , Mark Cave-Ayland , Yoshinori Sato , "Edgar E. Iglesias" , Aurelien Jarno , Richard Henderson , Thomas Huth , Max Filippov , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Jiaxun Yang , Michael Rolnik , Song Gao , qemu-riscv@nongnu.org, Aleksandar Rikalo , Julian Ganz Subject: [PATCH 07/35] plugins: add types for callbacks related to certain discontinuities Date: Mon, 27 Oct 2025 11:03:14 +0000 Message-ID: <20251027110344.2289945-8-alex.bennee@linaro.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251027110344.2289945-1-alex.bennee@linaro.org> References: <20251027110344.2289945-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::535; envelope-from=alex.bennee@linaro.org; helo=mail-ed1-x535.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@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-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org From: Julian Ganz The plugin API allows registration of callbacks for a variety of VCPU related events, such as VCPU reset, idle and resume. However, traps of any kind, i.e. interrupts or exceptions, were previously not covered. These kinds of events are arguably quite significant and usually go hand in hand with a PC discontinuity. On most platforms, the discontinuity also includes a transition from some "mode" to another. Thus, plugins for the analysis of (virtualized) embedded systems may benefit from or even require the possiblity to perform work on the occurance of an interrupt or exception. This change introduces the concept of such a discontinuity event in the form of an enumeration. Currently only traps are covered. Specifically we (loosely) define interrupts, exceptions and host calls across all platforms. In addition, this change introduces a type to use for callback functions related to such events. Since possible modes and the enumeration of interupts and exceptions vary greatly between different architectures, the callback type only receives the VCPU id, the type of event as well as the old and new PC. Reviewed-by: Pierrick Bouvier Reviewed-by: Richard Henderson Reviewed-by: Alex Bennée Signed-off-by: Julian Ganz Signed-off-by: Alex Bennée --- include/qemu/plugin.h | 1 + include/qemu/qemu-plugin.h | 44 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 45 insertions(+) diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h index f355c7cb8ab..8cf20cd96f7 100644 --- a/include/qemu/plugin.h +++ b/include/qemu/plugin.h @@ -59,6 +59,7 @@ union qemu_plugin_cb_sig { qemu_plugin_udata_cb_t udata; qemu_plugin_vcpu_simple_cb_t vcpu_simple; qemu_plugin_vcpu_udata_cb_t vcpu_udata; + qemu_plugin_vcpu_discon_cb_t vcpu_discon; qemu_plugin_vcpu_tb_trans_cb_t vcpu_tb_trans; qemu_plugin_vcpu_mem_cb_t vcpu_mem; qemu_plugin_vcpu_syscall_cb_t vcpu_syscall; diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index c450106af18..08bf366e363 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -161,6 +161,50 @@ typedef void (*qemu_plugin_vcpu_simple_cb_t)(qemu_plugin_id_t id, typedef void (*qemu_plugin_vcpu_udata_cb_t)(unsigned int vcpu_index, void *userdata); + +/** + * enum qemu_plugin_discon_type - type of a (potential) PC discontinuity + * + * @QEMU_PLUGIN_DISCON_INTERRUPT: an interrupt, defined across all architectures + * as an asynchronous event, usually originating + * from outside the CPU + * @QEMU_PLUGIN_DISCON_EXCEPTION: an exception, defined across all architectures + * as a synchronous event in response to a + * specific instruction being executed + * @QEMU_PLUGIN_DISCON_HOSTCALL: a host call, functionally a special kind of + * exception that is not handled by code run by + * the vCPU but machinery outside the vCPU + * @QEMU_PLUGIN_DISCON_ALL: all types of disconinuity events currently covered + */ +enum qemu_plugin_discon_type { + QEMU_PLUGIN_DISCON_INTERRUPT = 1 << 0, + QEMU_PLUGIN_DISCON_EXCEPTION = 1 << 1, + QEMU_PLUGIN_DISCON_HOSTCALL = 1 << 2, + QEMU_PLUGIN_DISCON_ALL = -1 +}; + +/** + * typedef qemu_plugin_vcpu_discon_cb_t - vcpu discontinuity callback + * @id: plugin ID + * @vcpu_index: the current vcpu context + * @type: the type of discontinuity + * @from_pc: the source of the discontinuity, e.g. the PC before the + * transition + * @to_pc: the PC pointing to the next instruction to be executed + * + * The exact semantics of @from_pc depends on the @type of discontinuity. For + * interrupts, @from_pc will point to the next instruction which would have + * been executed. For exceptions and host calls, @from_pc will point to the + * instruction that caused the exception or issued the host call. Note that + * in the case of exceptions, the instruction may not be retired and thus not + * observable via general instruction exec callbacks. The same may be the case + * for some host calls such as hypervisor call "exceptions". + */ +typedef void (*qemu_plugin_vcpu_discon_cb_t)(qemu_plugin_id_t id, + unsigned int vcpu_index, + enum qemu_plugin_discon_type type, + uint64_t from_pc, uint64_t to_pc); + /** * qemu_plugin_uninstall() - Uninstall a plugin * @id: this plugin's opaque ID -- 2.47.3