From nobody Fri Nov 14 23:30:22 2025 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 ARC-Seal: i=1; a=rsa-sha256; t=1759744788; cv=none; d=zohomail.com; s=zohoarc; b=Jni0SvJ3NPZnDejY03gqHwBItKwA+LUwX92kmH8Gktjo0J7SliMU32CWUfQ+womop+xiIckJdiv0rvrhy70qThVto6Cxb5mtEjmERuHlkUTkTAmjEJpf14OXw6tan81ddYkYa8J78rWrVhqI5VNXzHG5G9a6umjOe4A7znlTBbU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1759744788; 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=f9mln+46sxl9Nc6VtvOXWdum14sxJkNBjXA63A+hu2M=; b=JAQZdo+l/j2K0qeHYndcg2qySpGsyFML2T/6wwuNf/IOTx1Q3TZCNHcVzWyNZXEpezbZU8nvfRviHsOh1Kb2Er1bPwOJhHZToK3ktuPojXZMl8BPSB502IZpZ2S9D9fTnX+OdMFOGM8BZl8vYJRSYBXN96VgsOzo+16W+HpjzcY= ARC-Authentication-Results: i=1; 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Mon, 6 Oct 2025 11:57:38 +0200 (CEST) Received: (qmail 18671 invoked by uid 990); 6 Oct 2025 09:57:38 -0000 Received: from unknown (HELO unkown) (::1) by skiff.uberspace.de (Haraka/3.0.1) with ESMTPSA; Mon, 06 Oct 2025 11:57:38 +0200 Authentication-Results: skiff.uberspace.de; auth=pass (plain) From: Julian Ganz To: qemu-devel@nongnu.org Cc: Julian Ganz , Pierrick Bouvier , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Alexandre Iooss , Mahmoud Mandour Subject: [PATCH v7 04/25] contrib/plugins: add plugin showcasing new dicontinuity related API Date: Mon, 6 Oct 2025 11:56:59 +0200 Message-ID: <9ada544f3b3c1840f75d6e2bda8bc23783cd0b2b.1759744337.git.neither@nut.email> X-Mailer: git-send-email 2.49.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Rspamd-Bar: ---- X-Rspamd-Report: REPLY(-4) SUSPICIOUS_RECIPS(1.5) MID_CONTAINS_FROM(1) MIME_GOOD(-0.1) BAYES_HAM(-2.999999) R_MISSING_CHARSET(0.5) X-Rspamd-Score: -4.099999 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; 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Received-SPF: pass client-ip=2001:1a50:11:0:c83f:a8ff:fea6:c8da; envelope-from=neither@nut.email; helo=mailgate01.uberspace.is X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 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, NEW_PRODUCTS=1.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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 @nut.email) X-ZM-MESSAGEID: 1759744794638116600 Content-Type: text/plain; charset="utf-8" We recently introduced new plugin API for registration of discontinuity related callbacks. This change introduces a minimal plugin showcasing the new API. It simply counts the occurances of interrupts, exceptions and host calls per CPU and reports the counts when exitting. Reviewed-by: Pierrick Bouvier Signed-off-by: Julian Ganz Reviewed-by: Alex Benn=C3=A9e --- contrib/plugins/meson.build | 2 +- contrib/plugins/traps.c | 83 +++++++++++++++++++++++++++++++++++++ docs/about/emulation.rst | 8 ++++ 3 files changed, 92 insertions(+), 1 deletion(-) create mode 100644 contrib/plugins/traps.c diff --git a/contrib/plugins/meson.build b/contrib/plugins/meson.build index 7eb3629c95..eb944b5159 100644 --- a/contrib/plugins/meson.build +++ b/contrib/plugins/meson.build @@ -1,6 +1,6 @@ contrib_plugins =3D ['bbv', 'cache', 'cflow', 'drcov', 'execlog', 'hotbloc= ks', 'hotpages', 'howvec', 'hwprofile', 'ips', 'stoptrigger', - 'uftrace'] + 'traps', 'uftrace'] if host_os !=3D 'windows' # lockstep uses socket.h contrib_plugins +=3D 'lockstep' diff --git a/contrib/plugins/traps.c b/contrib/plugins/traps.c new file mode 100644 index 0000000000..d5ddc0f3dd --- /dev/null +++ b/contrib/plugins/traps.c @@ -0,0 +1,83 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * Copyright (C) 2025, Julian Ganz + * + * Traps - count traps + * + * Count the number of interrupts (asyncronous events), exceptions (synchr= onous + * events) and host calls (e.g. semihosting) per cpu and report those coun= ts on + * exit. + */ + +#include + +#include + +QEMU_PLUGIN_EXPORT int qemu_plugin_version =3D QEMU_PLUGIN_VERSION; + +typedef struct { + uint64_t interrupts; + uint64_t exceptions; + uint64_t hostcalls; +} TrapCounters; + +static struct qemu_plugin_scoreboard *traps; + +static void vcpu_discon(qemu_plugin_id_t id, unsigned int vcpu_index, + enum qemu_plugin_discon_type type, uint64_t from_p= c, + uint64_t to_pc) +{ + TrapCounters *rec =3D qemu_plugin_scoreboard_find(traps, vcpu_index); + switch (type) { + case QEMU_PLUGIN_DISCON_INTERRUPT: + rec->interrupts++; + break; + case QEMU_PLUGIN_DISCON_EXCEPTION: + rec->exceptions++; + break; + case QEMU_PLUGIN_DISCON_HOSTCALL: + rec->hostcalls++; + break; + default: + g_assert_not_reached(); + break; + } +} + +static void plugin_exit(qemu_plugin_id_t id, void *p) +{ + g_autoptr(GString) report; + report =3D g_string_new("VCPU, interrupts, exceptions, hostcalls\n"); + int max_vcpus =3D qemu_plugin_num_vcpus(); + int vcpu; + + for (vcpu =3D 0; vcpu < max_vcpus; vcpu++) { + TrapCounters *rec =3D qemu_plugin_scoreboard_find(traps, vcpu); + g_string_append_printf(report, + "% 4d, % 10"PRId64", % 10"PRId64", % 10"PRI= d64 + "\n", vcpu, rec->interrupts, rec->exception= s, + rec->hostcalls); + } + + qemu_plugin_outs(report->str); + qemu_plugin_scoreboard_free(traps); +} + +QEMU_PLUGIN_EXPORT +int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, + int argc, char **argv) +{ + if (!info->system_emulation) { + qemu_plugin_outs("Note: interrupts are only reported in system" + " emulation mode."); + } + + traps =3D qemu_plugin_scoreboard_new(sizeof(TrapCounters)); + + qemu_plugin_register_vcpu_discon_cb(id, QEMU_PLUGIN_DISCON_ALL, + vcpu_discon); + + qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); + + return 0; +} diff --git a/docs/about/emulation.rst b/docs/about/emulation.rst index 8a5e128f67..92c219119e 100644 --- a/docs/about/emulation.rst +++ b/docs/about/emulation.rst @@ -1015,6 +1015,14 @@ interesting to generate them around a particular poi= nt of execution:: # generate trace around init execution (2 seconds): $ uftrace dump --chrome --time-range=3D1753122320~1753122322 > init.js= on =20 +Count traps +........... + +``contrib/plugins/traps.c`` + +This plugin counts the number of interrupts (asyncronous events), exceptio= ns +(synchronous events) and host calls (e.g. semihosting) per cpu. + Other emulation features ------------------------ =20 --=20 2.49.1